glibc/aclocal.m4

dnl We define the macro GLIBC_PROVIDES to do an AC_PROVIDE for each macro
dnl which appears in configure.in before the sysdep configure scripts are run.
dnl Each sysdep configure.in does GLIBC_PROVIDES first, to avoid any
dnl AC_REQUIREs or AC_BEFOREs duplicating their code.
dnl
define(AC_FD_MSG,6)dnl Autoconf lossage.
define(AC_FD_CC,5)dnl Autoconf lossage.
AC_DEFUN([GLIBC_PROVIDES], [dnl
AC_PROVIDE([AC_PROG_INSTALL])dnl
AC_PROVIDE([AC_PROG_RANLIB])dnl
AC_PROVIDE([AC_PROG_CC])dnl
AC_PROVIDE([AC_PROG_CPP])dnl
# This file is generated from configure.in by Autoconf.  DO NOT EDIT!
])dnl
dnl
dnl Check for a symbol
dnl
AC_DEFUN(AC_CHECK_SYMBOL, [dnl
AC_MSG_CHECKING(for $1)
AC_CACHE_VAL(ac_cv_check_symbol_$1, [dnl
AC_TRY_LINK(,
changequote(,)dnl
extern char *$1[]; puts(*$1);,
changequote([,])dnl
	    ac_cv_check_symbol_$1=yes, ac_cv_check_symbol_$1=no)])
if test "$ac_cv_check_symbol_$1" = yes; then
changequote(,)dnl
  ac_tr_symbol=`echo $1 | tr '[a-z]' '[A-Z]'`
changequote([,])dnl
  AC_DEFINE_UNQUOTED(HAVE_${ac_tr_symbol})
fi
AC_MSG_RESULT($ac_cv_check_symbol_$1)])dnl
dnl

dnl These modifications are to allow for an empty cross compiler tree.
dnl In the situation that cross-linking is impossible, the variable
dnl `cross_linkable' will be substituted with "yes".
AC_DEFUN(AC_PROG_CC_LOCAL,
[AC_BEFORE([$0], [AC_PROG_CPP])dnl
AC_CHECK_PROG(CC, gcc, gcc)
if test -z "$CC"; then
  AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
  test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
fi

AC_PROG_CC_WORKS_LOCAL
AC_PROG_CC_GNU

dnl The following differs from the AC_PROG_CC macro in autoconf.  Since
dnl we require a recent version of gcc to be used we do not need to go
dnl into lengths and test for bugs in old versions.  It must be gcc 2.7
dnl or above.
if test $ac_cv_prog_gcc = yes; then
  GCC=yes

dnl Check the version
  cat > conftest.c <<EOF
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
  yes;
#endif
EOF
  if AC_TRY_COMMAND(${CC-cc} -E conftest.c) | egrep yes >/dev/null 2>&1; then
    if test -z "$CFLAGS"; then
      CFLAGS="-g -O2"
    fi
  else
    AC_MSG_ERROR([We require GNU CC version 2.7 or newer])
  fi
else
  AC_MSG_ERROR([GNU libc must be compiled using GNU CC])
fi
])

AC_DEFUN(AC_PROG_CC_WORKS_LOCAL,
[AC_MSG_CHECKING([whether the C compiler ($CC $CFLAGS $LDFLAGS) works])
AC_LANG_SAVE
AC_LANG_C
AC_TRY_COMPILER([main(){return(0);}], ac_cv_prog_cc_works, ac_cv_prog_cc_cross)
AC_LANG_RESTORE
AC_MSG_RESULT($ac_cv_prog_cc_works)
if test $ac_cv_prog_cc_works = no; then
 cross_linkable=no
 ac_cv_prog_cc_cross=yes
dnl AC_MSG_ERROR([installation or configuration problem: C compiler cannot create executables.])
else
 cross_linkable=yes
fi
AC_MSG_CHECKING([whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler])
AC_MSG_RESULT($ac_cv_prog_cc_cross)
AC_SUBST(cross_linkable)
cross_compiling=$ac_cv_prog_cc_cross
])