?? configure.in
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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$libc_cv_gcc___thread" != xyes; then AC_MSG_ERROR(compiler support for __thread is required)fiif test "x${libc_cv_visibility_attribute}" != xyes || test "x${libc_cv_broken_visibility_attribute}" != xno; then AC_MSG_ERROR(working compiler support for visibility attribute is required)fiif test "x$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) ;; *) ;; esacfidnl Iff <unwind.h> is available, make sure it is the right one and itdnl contains struct _Unwind_Exception.AC_CACHE_CHECK(dnlfor forced unwind support, libc_cv_forced_unwind, [dnlAC_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]) fielse AC_MSG_ERROR(forced unwind support is required)fi
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