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