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47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
dnl configure fragment for new libpthread implementation.
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GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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if test "x$libc_cv_gcc___thread" != xyes; then
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AC_MSG_ERROR(compiler support for __thread is required)
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fi
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if test "x${libc_cv_visibility_attribute}" != xyes ||
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test "x${libc_cv_broken_visibility_attribute}" != xno; then
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AC_MSG_ERROR(working compiler support for visibility attribute is required)
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fi
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dnl Iff <unwind.h> is available, make sure it is the right one and it
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dnl contains struct _Unwind_Exception.
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AC_CACHE_CHECK(dnl
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for forced unwind support, libc_cv_forced_unwind, [dnl
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old_CPPFLAGS="$CPPFLAGS"
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# Without inhibit_libc #define'd, GCC's unwind.h (at least for ia64)
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# will try to include <stdlib.h>, which doesn't exist yet if we're
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# building libc in a bare environment.
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CPPFLAGS="$CPPFLAGS -Dinhibit_libc=1"
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AC_TRY_COMPILE([#include <unwind.h>], [
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struct _Unwind_Exception exc;
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struct _Unwind_Context *context;
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_Unwind_GetCFA (context)],
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libc_cv_forced_unwind=yes, libc_cv_forced_unwind=no)
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CPPFLAGS="$old_CPPFLAGS"])
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if test $libc_cv_forced_unwind = yes; then
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AC_DEFINE(HAVE_FORCED_UNWIND)
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dnl Check for C cleanup handling.
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old_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -fexceptions"
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AC_CACHE_CHECK([for C cleanup handling], libc_cv_c_cleanup, [dnl
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AC_TRY_COMPILE([
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extern void some_function (void);
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void cl (void *a) { }], [
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int a __attribute__ ((cleanup (cl)));
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some_function ()],
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libc_cv_c_cleanup=yes, libc_cv_c_cleanup=no)])
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CFLAGS="$old_CFLAGS"
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if test $libc_cv_c_cleanup = no; then
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AC_MSG_ERROR([the compiler must support C cleanup handling])
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fi
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else
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AC_MSG_ERROR(forced unwind support is required)
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fi
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