| 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${libc_cv_broken_visibility_attribute}" != xno; then |
| AC_MSG_ERROR(working compiler support for visibility attribute is required) |
| fi |
| |
| if test "x$libc_cv_asm_cfi_directives" != xyes; then |
| dnl We need this only for some architectures. |
| case "$base_machine" in |
| i386 | x86_64 | powerpc | s390) |
| AC_MSG_ERROR(CFI directive support in assembler is required) ;; |
| *) ;; |
| esac |
| 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 |
| AC_TRY_LINK([#include <unwind.h>], [ |
| struct _Unwind_Exception exc; |
| struct _Unwind_Context *context; |
| _Unwind_GetCFA (context)], |
| libc_cv_forced_unwind=yes, libc_cv_forced_unwind=no)]) |
| if test $libc_cv_forced_unwind = yes; then |
| AC_DEFINE(HAVE_FORCED_UNWIND) |
| dnl Check for C cleanup handling. |
| old_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS -Werror -fexceptions" |
| AC_CACHE_CHECK([for C cleanup handling], libc_cv_c_cleanup, [dnl |
| AC_TRY_LINK([ |
| #include <stdio.h> |
| void cl (void *a) { }], [ |
| int a __attribute__ ((cleanup (cl))); |
| puts ("test")], |
| libc_cv_c_cleanup=yes, libc_cv_c_cleanup=no)]) |
| CFLAGS="$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 |
