1 dnl configure fragment for new libpthread implementation.
2 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
4 if test "x$libc_cv_gcc___thread" != xyes; then
5 AC_MSG_ERROR(compiler support for __thread is required)
8 if test "x${libc_cv_visibility_attribute}" != xyes ||
9 test "x${libc_cv_broken_visibility_attribute}" != xno; then
10 AC_MSG_ERROR(working compiler support for visibility attribute is required)
13 dnl Iff <unwind.h> is available, make sure it is the right one and it
14 dnl contains struct _Unwind_Exception.
16 for forced unwind support, libc_cv_forced_unwind, [dnl
17 old_CPPFLAGS="$CPPFLAGS"
18 # Without inhibit_libc #define'd, GCC's unwind.h (at least for ia64)
19 # will try to include <stdlib.h>, which doesn't exist yet if we're
20 # building libc in a bare environment.
21 CPPFLAGS="$CPPFLAGS -Dinhibit_libc=1"
22 AC_TRY_COMPILE([#include <unwind.h>], [
23 struct _Unwind_Exception exc;
24 struct _Unwind_Context *context;
25 _Unwind_GetCFA (context)],
26 libc_cv_forced_unwind=yes, libc_cv_forced_unwind=no)
27 CPPFLAGS="$old_CPPFLAGS"])
28 if test $libc_cv_forced_unwind = yes; then
29 AC_DEFINE(HAVE_FORCED_UNWIND)
30 dnl Check for C cleanup handling.
32 CFLAGS="$CFLAGS -Werror -fexceptions"
33 AC_CACHE_CHECK([for C cleanup handling], libc_cv_c_cleanup, [dnl
35 extern void some_function (void);
36 void cl (void *a) { }], [
37 int a __attribute__ ((cleanup (cl)));
39 libc_cv_c_cleanup=yes, libc_cv_c_cleanup=no)])
41 if test $libc_cv_c_cleanup = no; then
42 AC_MSG_ERROR([the compiler must support C cleanup handling])
45 AC_MSG_ERROR(forced unwind support is required)