db35cc2cc3
benefit of Cygwin git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34826 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
707 lines
23 KiB
Plaintext
707 lines
23 KiB
Plaintext
dnl ---------------------------------------------------------------------------
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dnl
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dnl Macros for configure.in for wxWindows by Robert Roebling, Phil Blecker,
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dnl Vadim Zeitlin and Ron Lee
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dnl
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dnl This script is under the wxWindows licence.
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dnl
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dnl Version: $Id$
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dnl ---------------------------------------------------------------------------
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dnl ===========================================================================
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dnl Objective-C(++) related macros
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dnl ===========================================================================
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m4_define([AC_WX_LANG_OBJECTIVEC],
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[AC_LANG(C)
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ac_ext=m
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])
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m4_define([AC_WX_LANG_OBJECTIVECPLUSPLUS],
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[AC_LANG(C++)
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ac_ext=mm
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])
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dnl ===========================================================================
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dnl macros to find the a file in the list of include/lib paths
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dnl ===========================================================================
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dnl ---------------------------------------------------------------------------
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dnl call WX_PATH_FIND_INCLUDES(search path, header name), sets ac_find_includes
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dnl to the full name of the file that was found or leaves it empty if not found
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_PATH_FIND_INCLUDES],
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[
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ac_find_includes=
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for ac_dir in $1 /usr/include;
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do
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if test -f "$ac_dir/$2"; then
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ac_find_includes=$ac_dir
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break
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fi
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done
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])
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dnl ---------------------------------------------------------------------------
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dnl call WX_PATH_FIND_LIBRARIES(search path, header name), sets ac_find_libraries
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dnl to the full name of the file that was found or leaves it empty if not found
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_PATH_FIND_LIBRARIES],
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[
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ac_find_libraries=
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for ac_dir in $1 /usr/lib;
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do
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for ac_extension in a so sl dylib dll.a; do
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if test -f "$ac_dir/lib$2.$ac_extension"; then
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ac_find_libraries=$ac_dir
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break 2
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fi
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done
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done
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])
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dnl ---------------------------------------------------------------------------
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dnl Path to include, already defined
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_INCLUDE_PATH_EXIST],
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[
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dnl never add -I/usr/include to the CPPFLAGS
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if test "x$1" = "x/usr/include"; then
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ac_path_to_include=""
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else
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echo "$2" | grep "\-I$1" > /dev/null
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result=$?
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if test $result = 0; then
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ac_path_to_include=""
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else
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ac_path_to_include=" -I$1"
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fi
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fi
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])
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dnl ---------------------------------------------------------------------------
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dnl Path to link, already defined
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_LINK_PATH_EXIST],
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[
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echo "$2" | grep "\-L$1" > /dev/null
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result=$?
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if test $result = 0; then
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ac_path_to_link=""
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else
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ac_path_to_link=" -L$1"
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fi
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])
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dnl ===========================================================================
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dnl C++ features test
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dnl ===========================================================================
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dnl ---------------------------------------------------------------------------
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dnl WX_CPP_NEW_HEADERS checks whether the compiler has "new" <iostream> header
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dnl or only the old <iostream.h> one - it may be generally assumed that if
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dnl <iostream> exists, the other "new" headers (without .h) exist too.
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dnl
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dnl call WX_CPP_NEW_HEADERS(actiof-if-true, action-if-false)
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_CPP_NEW_HEADERS],
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[
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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AC_CHECK_HEADERS(iostream)
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if test "$ac_cv_header_iostream" = "yes" ; then
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ifelse([$1], , :, [$1])
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else
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ifelse([$2], , :, [$2])
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fi
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AC_LANG_RESTORE
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])
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dnl ---------------------------------------------------------------------------
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dnl WX_CPP_BOOL checks whether the C++ compiler has a built in bool type
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dnl
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dnl call WX_CPP_BOOL - will define HAVE_BOOL if the compiler supports bool
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_CPP_BOOL],
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[
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AC_CACHE_CHECK([if C++ compiler supports bool], wx_cv_cpp_bool,
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[
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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AC_TRY_COMPILE(
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[
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],
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[
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bool b = true;
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return 0;
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],
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[
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wx_cv_cpp_bool=yes
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],
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[
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wx_cv_cpp_bool=no
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]
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)
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AC_LANG_RESTORE
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])
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if test "$wx_cv_cpp_bool" = "yes"; then
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AC_DEFINE(HAVE_BOOL)
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fi
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])
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dnl ---------------------------------------------------------------------------
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dnl WX_CPP_EXPLICIT checks whether the C++ compiler support the explicit
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dnl keyword and defines HAVE_EXPLICIT if this is the case
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_CPP_EXPLICIT],
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[
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AC_CACHE_CHECK([if C++ compiler supports the explicit keyword],
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wx_cv_explicit,
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[
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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dnl do the test in 2 steps: first check that the compiler knows about the
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dnl explicit keyword at all and then verify that it really honours it
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AC_TRY_COMPILE(
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[
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class Foo { public: explicit Foo(int) {} };
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],
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[
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return 0;
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],
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[
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AC_TRY_COMPILE(
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[
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class Foo { public: explicit Foo(int) {} };
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static void TakeFoo(const Foo& foo) { }
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],
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[
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TakeFoo(17);
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return 0;
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],
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wx_cv_explicit=no,
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wx_cv_explicit=yes
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)
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],
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wx_cv_explicit=no
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)
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AC_LANG_RESTORE
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])
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if test "$wx_cv_explicit" = "yes"; then
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AC_DEFINE(HAVE_EXPLICIT)
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fi
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])
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dnl ---------------------------------------------------------------------------
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dnl a slightly better AC_C_BIGENDIAN macro which allows cross-compiling
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_C_BIGENDIAN],
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[AC_CACHE_CHECK([whether byte ordering is bigendian], ac_cv_c_bigendian,
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[ac_cv_c_bigendian=unknown
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# See if sys/param.h defines the BYTE_ORDER macro.
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AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/param.h>], [
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#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
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bogus endian macros
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#endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
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AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/param.h>], [
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#if BYTE_ORDER != BIG_ENDIAN
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not big endian
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#endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
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if test $ac_cv_c_bigendian = unknown; then
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AC_TRY_RUN([main () {
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/* Are we little or big endian? From Harbison&Steele. */
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union
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{
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long l;
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char c[sizeof (long)];
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} u;
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u.l = 1;
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exit (u.c[sizeof (long) - 1] == 1);
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}], [ac_cv_c_bigendian=no], [ac_cv_c_bigendian=yes], [ac_cv_c_bigendian=unknown])
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fi])
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if test $ac_cv_c_bigendian = unknown; then
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AC_MSG_WARN([Assuming little-endian target machine - this may be overriden by adding the line "ac_cv_c_bigendian=${ac_cv_c_bigendian='yes'}" to config.cache file])
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fi
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if test $ac_cv_c_bigendian = yes; then
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AC_DEFINE(WORDS_BIGENDIAN)
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fi
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])
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dnl ---------------------------------------------------------------------------
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dnl override AC_ARG_ENABLE/WITH to cache the results in .cache file
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_ARG_CACHE_INIT],
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[
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wx_arg_cache_file="configarg.cache"
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echo "loading argument cache $wx_arg_cache_file"
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rm -f ${wx_arg_cache_file}.tmp
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touch ${wx_arg_cache_file}.tmp
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touch ${wx_arg_cache_file}
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])
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AC_DEFUN([WX_ARG_CACHE_FLUSH],
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[
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echo "saving argument cache $wx_arg_cache_file"
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mv ${wx_arg_cache_file}.tmp ${wx_arg_cache_file}
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])
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dnl this macro checks for a three-valued command line --with argument:
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dnl possible arguments are 'yes', 'no', 'sys', or 'builtin'
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dnl usage: WX_ARG_SYS_WITH(option, helpmessage, variable-name)
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AC_DEFUN([WX_ARG_SYS_WITH],
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[
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AC_MSG_CHECKING([for --with-$1])
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no_cache=0
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AC_ARG_WITH($1, [$2],
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[
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if test "$withval" = yes; then
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ac_cv_use_$1='$3=yes'
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elif test "$withval" = no; then
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ac_cv_use_$1='$3=no'
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elif test "$withval" = sys; then
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ac_cv_use_$1='$3=sys'
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elif test "$withval" = builtin; then
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ac_cv_use_$1='$3=builtin'
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else
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AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
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fi
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],
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[
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LINE=`grep "$3" ${wx_arg_cache_file}`
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if test "x$LINE" != x ; then
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eval "DEFAULT_$LINE"
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else
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no_cache=1
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fi
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ac_cv_use_$1='$3='$DEFAULT_$3
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])
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eval "$ac_cv_use_$1"
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if test "$no_cache" != 1; then
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echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
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fi
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if test "$$3" = yes; then
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AC_MSG_RESULT(yes)
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elif test "$$3" = no; then
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AC_MSG_RESULT(no)
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elif test "$$3" = sys; then
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AC_MSG_RESULT([system version])
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elif test "$$3" = builtin; then
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AC_MSG_RESULT([builtin version])
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else
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AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
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fi
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])
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dnl this macro checks for a command line argument and caches the result
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dnl usage: WX_ARG_WITH(option, helpmessage, variable-name)
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AC_DEFUN([WX_ARG_WITH],
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[
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AC_MSG_CHECKING([for --with-$1])
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no_cache=0
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AC_ARG_WITH($1, [$2],
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[
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if test "$withval" = yes; then
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ac_cv_use_$1='$3=yes'
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else
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ac_cv_use_$1='$3=no'
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fi
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],
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[
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LINE=`grep "$3" ${wx_arg_cache_file}`
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if test "x$LINE" != x ; then
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eval "DEFAULT_$LINE"
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else
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no_cache=1
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fi
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ac_cv_use_$1='$3='$DEFAULT_$3
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])
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eval "$ac_cv_use_$1"
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if test "$no_cache" != 1; then
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echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
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fi
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if test "$$3" = yes; then
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AC_MSG_RESULT(yes)
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else
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AC_MSG_RESULT(no)
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fi
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])
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dnl like WX_ARG_WITH but uses AC_ARG_ENABLE instead of AC_ARG_WITH
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dnl usage: WX_ARG_ENABLE(option, helpmessage, variable-name, enablestring)
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dnl
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dnl enablestring is a hack and allows to show "checking for --disable-foo"
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dnl message when running configure instead of the default "checking for
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dnl --enable-foo" one whih is useful for the options enabled by default
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AC_DEFUN([WX_ARG_ENABLE],
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[
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enablestring=$4
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AC_MSG_CHECKING([for --${enablestring:-enable}-$1])
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no_cache=0
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AC_ARG_ENABLE($1, [$2],
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[
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if test "$enableval" = yes; then
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ac_cv_use_$1='$3=yes'
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else
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ac_cv_use_$1='$3=no'
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fi
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],
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[
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LINE=`grep "$3" ${wx_arg_cache_file}`
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if test "x$LINE" != x ; then
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eval "DEFAULT_$LINE"
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else
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no_cache=1
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fi
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ac_cv_use_$1='$3='$DEFAULT_$3
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])
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eval "$ac_cv_use_$1"
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if test "$no_cache" != 1; then
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echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
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fi
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if test "$$3" = yes; then
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AC_MSG_RESULT(yes)
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else
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AC_MSG_RESULT(no)
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fi
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])
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dnl ===========================================================================
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dnl Linker features test
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dnl ===========================================================================
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dnl ---------------------------------------------------------------------------
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dnl WX_VERSIONED_SYMBOLS checks whether the linker can create versioned
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dnl symbols. If it can, sets LDFLAGS_VERSIONING to $CXX flags needed to use
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dnl version script file named versionfile
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dnl
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dnl call WX_VERSIONED_SYMBOLS(versionfile)
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dnl ---------------------------------------------------------------------------
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AC_DEFUN([WX_VERSIONED_SYMBOLS],
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[
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found_versioning=no
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dnl FIXME - doesn't work, Solaris linker doesn't accept wildcards
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dnl in the script.
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dnl dnl Check for known non-gcc cases:
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dnl case "${host}" in
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dnl *-*-solaris2* )
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dnl if test "x$GCC" != "xyes" ; then
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dnl LDFLAGS_VERSIONING="-M $1"
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dnl found_versioning=yes
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dnl fi
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dnl ;;
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dnl esac
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dnl Generic check for GCC or GCC-like behaviour (Intel C++, GCC):
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if test $found_versioning = no ; then
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AC_CACHE_CHECK([if the linker accepts --version-script], wx_cv_version_script,
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[
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echo "VER_1 { *; };" >conftest.sym
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echo "int main() { return 0; }" >conftest.cpp
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if AC_TRY_COMMAND([
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$CXX -o conftest.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
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-Wl,--version-script,conftest.sym >/dev/null 2>conftest.stderr]) ; then
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if test -s conftest.stderr ; then
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wx_cv_version_script=no
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else
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wx_cv_version_script=yes
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fi
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else
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wx_cv_version_script=no
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fi
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dnl There's a problem in some old linkers with --version-script that
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dnl can cause linking to fail when you have objects with vtables in
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dnl libs 3 deep. This is known to happen in netbsd and openbsd with
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dnl ld 2.11.2.
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dnl
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dnl To test for this we need to make some shared libs and
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dnl unfortunately we can't be sure of the right way to do that. If the
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dnl first two compiles don't succeed then it looks like the test isn't
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dnl working and the result is ignored, but if OTOH the first two
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dnl succeed but the third does not then the bug has been detected and
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dnl the --version-script flag is dropped.
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if test $wx_cv_version_script = yes
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then
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echo "struct B { virtual ~B() { } }; \
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struct D : public B { }; \
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void F() { D d; }" > conftest.cpp
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if AC_TRY_COMMAND([
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$CXX -shared -fPIC -o conftest1.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
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-Wl,--version-script,conftest.sym >/dev/null 2>/dev/null]) &&
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AC_TRY_COMMAND([
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$CXX -shared -fPIC -o conftest2.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
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-Wl,--version-script,conftest.sym conftest1.output >/dev/null 2>/dev/null])
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then
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if AC_TRY_COMMAND([
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$CXX -shared -fPIC -o conftest3.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
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-Wl,--version-script,conftest.sym conftest2.output conftest1.output >/dev/null 2>/dev/null])
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then
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wx_cv_version_script=yes
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else
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wx_cv_version_script=no
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fi
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fi
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fi
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rm -f conftest.output conftest.stderr conftest.sym conftest.cpp
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rm -f conftest1.output conftest2.output conftest3.output
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])
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if test $wx_cv_version_script = yes ; then
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LDFLAGS_VERSIONING="-Wl,--version-script,$1"
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fi
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fi
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])
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dnl ===========================================================================
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dnl "3rd party" macros included here because they are not widely available
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dnl ===========================================================================
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dnl ---------------------------------------------------------------------------
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dnl test for availability of iconv()
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dnl ---------------------------------------------------------------------------
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dnl From Bruno Haible.
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AC_DEFUN([AM_ICONV],
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[
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dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
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dnl those with the standalone portable GNU libiconv installed).
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AC_ARG_WITH([libiconv-prefix],
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[ --with-libiconv-prefix=DIR search for libiconv in DIR/include and DIR/lib], [
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for dir in `echo "$withval" | tr : ' '`; do
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if test -d $dir/include; then CPPFLAGS="$CPPFLAGS -I$dir/include"; fi
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if test -d $dir/lib; then LDFLAGS="$LDFLAGS -L$dir/lib"; fi
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done
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])
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AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
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am_cv_func_iconv="no, consider installing GNU libiconv"
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am_cv_lib_iconv=no
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AC_TRY_LINK([#include <stdlib.h>
|
|
#include <iconv.h>],
|
|
[iconv_t cd = iconv_open("","");
|
|
iconv(cd,NULL,NULL,NULL,NULL);
|
|
iconv_close(cd);],
|
|
am_cv_func_iconv=yes)
|
|
if test "$am_cv_func_iconv" != yes; then
|
|
am_save_LIBS="$LIBS"
|
|
LIBS="$LIBS -liconv"
|
|
AC_TRY_LINK([#include <stdlib.h>
|
|
#include <iconv.h>],
|
|
[iconv_t cd = iconv_open("","");
|
|
iconv(cd,NULL,NULL,NULL,NULL);
|
|
iconv_close(cd);],
|
|
am_cv_lib_iconv=yes
|
|
am_cv_func_iconv=yes)
|
|
LIBS="$am_save_LIBS"
|
|
fi
|
|
])
|
|
if test "$am_cv_func_iconv" = yes; then
|
|
AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
|
|
AC_CACHE_CHECK([if iconv needs const], wx_cv_func_iconv_const,
|
|
AC_TRY_COMPILE([
|
|
#include <stdlib.h>
|
|
#include <iconv.h>
|
|
extern
|
|
#ifdef __cplusplus
|
|
"C"
|
|
#endif
|
|
#if defined(__STDC__) || defined(__cplusplus)
|
|
size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
|
|
#else
|
|
size_t iconv();
|
|
#endif
|
|
],
|
|
[],
|
|
wx_cv_func_iconv_const="no",
|
|
wx_cv_func_iconv_const="yes"
|
|
)
|
|
)
|
|
|
|
iconv_const=
|
|
if test "x$wx_cv_func_iconv_const" = "xyes"; then
|
|
iconv_const="const"
|
|
fi
|
|
|
|
AC_DEFINE_UNQUOTED(ICONV_CONST, $iconv_const,
|
|
[Define as const if the declaration of iconv() needs const.])
|
|
fi
|
|
LIBICONV=
|
|
if test "$am_cv_lib_iconv" = yes; then
|
|
LIBICONV="-liconv"
|
|
fi
|
|
AC_SUBST(LIBICONV)
|
|
])
|
|
|
|
dnl ---------------------------------------------------------------------------
|
|
dnl AC_SYS_LARGEFILE (partly based on the code from autoconf 2.5x)
|
|
dnl ---------------------------------------------------------------------------
|
|
|
|
dnl WX_SYS_LARGEFILE_TEST
|
|
dnl
|
|
dnl NB: original autoconf test was checking if compiler supported 6 bit off_t
|
|
dnl arithmetic properly but this failed miserably with gcc under Linux
|
|
dnl whereas the system still supports 64 bit files, so now simply check
|
|
dnl that off_t is big enough
|
|
define(WX_SYS_LARGEFILE_TEST,
|
|
[typedef struct {
|
|
unsigned int field: sizeof(off_t) == 8;
|
|
} wxlf;
|
|
])
|
|
|
|
|
|
dnl WX_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR)
|
|
define(WX_SYS_LARGEFILE_MACRO_VALUE,
|
|
[
|
|
AC_CACHE_CHECK([for $1 value needed for large files], [$3],
|
|
[
|
|
AC_TRY_COMPILE([#define $1 $2
|
|
#include <sys/types.h>],
|
|
WX_SYS_LARGEFILE_TEST,
|
|
[$3=$2],
|
|
[$3=no])
|
|
]
|
|
)
|
|
|
|
if test "$$3" != no; then
|
|
wx_largefile=yes
|
|
AC_DEFINE_UNQUOTED([$1], [$$3])
|
|
fi
|
|
])
|
|
|
|
|
|
dnl AC_SYS_LARGEFILE
|
|
dnl ----------------
|
|
dnl By default, many hosts won't let programs access large files;
|
|
dnl one must use special compiler options to get large-file access to work.
|
|
dnl For more details about this brain damage please see:
|
|
dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
|
|
AC_DEFUN([AC_SYS_LARGEFILE],
|
|
[AC_ARG_ENABLE(largefile,
|
|
[ --disable-largefile omit support for large files])
|
|
if test "$enable_largefile" != no; then
|
|
dnl _FILE_OFFSET_BITS==64 is needed for Linux, Solaris, ...
|
|
dnl _LARGE_FILES -- for AIX
|
|
wx_largefile=no
|
|
WX_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits)
|
|
if test "x$wx_largefile" != "xyes"; then
|
|
WX_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files)
|
|
fi
|
|
|
|
AC_MSG_CHECKING(if large file support is available)
|
|
if test "x$wx_largefile" = "xyes"; then
|
|
AC_DEFINE(HAVE_LARGEFILE_SUPPORT)
|
|
fi
|
|
AC_MSG_RESULT($wx_largefile)
|
|
fi
|
|
])
|
|
|
|
|
|
dnl Available from the GNU Autoconf Macro Archive at:
|
|
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_const_cast.html
|
|
dnl
|
|
AC_DEFUN([AC_CXX_CONST_CAST],
|
|
[AC_CACHE_CHECK(whether the compiler supports const_cast<>,
|
|
ac_cv_cxx_const_cast,
|
|
[AC_LANG_SAVE
|
|
AC_LANG_CPLUSPLUS
|
|
AC_TRY_COMPILE(,[int x = 0;const int& y = x;int& z = const_cast<int&>(y);return z;],
|
|
ac_cv_cxx_const_cast=yes, ac_cv_cxx_const_cast=no)
|
|
AC_LANG_RESTORE
|
|
])
|
|
if test "$ac_cv_cxx_const_cast" = yes; then
|
|
AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])
|
|
fi
|
|
])
|
|
|
|
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_reinterpret_cast.html
|
|
AC_DEFUN([AC_CXX_REINTERPRET_CAST],
|
|
[AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
|
|
ac_cv_cxx_reinterpret_cast,
|
|
[AC_LANG_SAVE
|
|
AC_LANG_CPLUSPLUS
|
|
AC_TRY_COMPILE([#include <typeinfo>
|
|
class Base { public : Base () {} virtual void f () = 0;};
|
|
class Derived : public Base { public : Derived () {} virtual void f () {} };
|
|
class Unrelated { public : Unrelated () {} };
|
|
int g (Unrelated&) { return 0; }],[
|
|
Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);],
|
|
ac_cv_cxx_reinterpret_cast=yes, ac_cv_cxx_reinterpret_cast=no)
|
|
AC_LANG_RESTORE
|
|
])
|
|
if test "$ac_cv_cxx_reinterpret_cast" = yes; then
|
|
AC_DEFINE(HAVE_REINTERPRET_CAST,,
|
|
[define if the compiler supports reinterpret_cast<>])
|
|
fi
|
|
])
|
|
|
|
dnl and http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_static_cast.html
|
|
AC_DEFUN([AC_CXX_STATIC_CAST],
|
|
[AC_CACHE_CHECK(whether the compiler supports static_cast<>,
|
|
ac_cv_cxx_static_cast,
|
|
[AC_LANG_SAVE
|
|
AC_LANG_CPLUSPLUS
|
|
AC_TRY_COMPILE([#include <typeinfo>
|
|
class Base { public : Base () {} virtual void f () = 0; };
|
|
class Derived : public Base { public : Derived () {} virtual void f () {} };
|
|
int g (Derived&) { return 0; }],[
|
|
Derived d; Base& b = d; Derived& s = static_cast<Derived&> (b); return g (s);],
|
|
ac_cv_cxx_static_cast=yes, ac_cv_cxx_static_cast=no)
|
|
AC_LANG_RESTORE
|
|
])
|
|
if test "$ac_cv_cxx_static_cast" = yes; then
|
|
AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>])
|
|
fi
|
|
])
|
|
|
|
dnl http://autoconf-archive.cryp.to/ac_cxx_dynamic_cast.html
|
|
AC_DEFUN([AC_CXX_DYNAMIC_CAST],
|
|
[AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
|
|
ac_cv_cxx_dynamic_cast,
|
|
[AC_LANG_SAVE
|
|
AC_LANG_CPLUSPLUS
|
|
AC_TRY_COMPILE([#include <typeinfo>
|
|
class Base { public : Base () {} virtual void f () = 0;};
|
|
class Derived : public Base { public : Derived () {} virtual void f () {} };],[
|
|
Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
|
|
ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
|
|
AC_LANG_RESTORE
|
|
])
|
|
if test "$ac_cv_cxx_dynamic_cast" = yes; then
|
|
AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
|
|
fi
|
|
])
|
|
|