PR c++/27804

[pf3gnuchains/gcc-fork.git] / gcc / configure.ac

diff --git a/gcc/configure.ac b/gcc/configure.ac
index 7b9a94f..d4d09f5 100644 (file)
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1154,6 +1154,12 @@ gcc_AC_CHECK_DECLS(times, , ,[
 #endif
 ])
 
+gcc_AC_CHECK_DECLS(sigaltstack, , ,[
+#include "ansidecl.h"
+#include "system.h"
+#include <signal.h>
+])
+
 # More time-related stuff.
 AC_CACHE_CHECK(for struct tms, ac_cv_struct_tms, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
@@ -1337,6 +1343,22 @@ if test "$host_xm_file" != "$build_xm_file"; then
        fi
 fi
 
+case ${host} in
+  powerpc-*-darwin*)
+    AC_CACHE_CHECK([whether mcontext_t fields have underscores],
+      gcc_cv_mcontext_underscores,
+      AC_COMPILE_IFELSE([
+#include <ucontext.h>
+int main() { mcontext_t m; if (m->ss.srr0) return 0; return 0; }
+],
+       gcc_cv_mcontext_underscores=no, gcc_cv_mcontext_underscores=yes))
+      if test $gcc_cv_mcontext_underscores = yes; then
+        AC_DEFINE(HAS_MCONTEXT_T_UNDERSCORES,,dnl
+          [mcontext_t fields start with __])
+      fi
+    ;;
+esac
+
 # ---------
 # Threading
 # ---------
@@ -1392,7 +1414,7 @@ if test x$enable___cxa_atexit = xyes || \
     use_cxa_atexit=yes
   fi
   if test x$use_cxa_atexit = xyes; then
-    AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 1,
+    AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 2,
       [Define if you want to use __cxa_atexit, rather than atexit, to
       register C++ destructors for local statics and global objects.
       This is essential for fully standards-compliant handling of
@@ -1918,7 +1940,8 @@ fi
 gcc_cv_binutils_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/binutils
 AS_VAR_SET_IF(gcc_cv_nm,, [
 if test -f $gcc_cv_binutils_srcdir/configure.in \
-     && test -f ../binutils/Makefile; then
+     && test -f ../binutils/Makefile \
+     && test x$build = x$host; then
        gcc_cv_nm=../binutils/nm-new$build_exeext
 elif test -x nm$build_exeext; then
        gcc_cv_nm=./nm$build_exeext
@@ -1944,7 +1967,8 @@ AC_SUBST(ORIGINAL_NM_FOR_TARGET)
 # Figure out what objdump we will be using.
 AS_VAR_SET_IF(gcc_cv_objdump,, [
 if test -f $gcc_cv_binutils_srcdir/configure.in \
-     && test -f ../binutils/Makefile; then
+     && test -f ../binutils/Makefile \
+     && test x$build = x$host; then
        # Single tree build which includes binutils.
        gcc_cv_objdump=../binutils/objdump$build_exeext
 elif test -x objdump$build_exeext; then
@@ -3176,6 +3200,39 @@ if test x$gcc_cv_libc_provides_ssp = xyes; then
            [Define if your target C library provides stack protector support])
 fi
 
+# Check if TFmode long double should be used by default or not.
+# Some glibc targets used DFmode long double, but with glibc 2.4
+# and later they can use TFmode.
+case "$target" in
+  powerpc*-*-*gnu* | \
+  sparc*-*-linux* | \
+  s390*-*-linux* | \
+  alpha*-*-linux*)
+    AC_ARG_WITH(long-double-128,
+[  --with-long-double-128  Use 128-bit long double by default.],
+      gcc_cv_target_ldbl128="$with_long_double_128",
+      [gcc_cv_target_ldbl128=no
+      if test x$host != x$target || test "x$TARGET_SYSTEM_ROOT" != x; then
+       if test "x$with_sysroot" = x; then
+         glibc_header_dir="${exec_prefix}/${target_noncanonical}/sys-include"
+       elif test "x$with_sysroot" = xyes; then
+         glibc_header_dir="${exec_prefix}/${target_noncanonical}/sys-root/usr/include"
+       else
+         glibc_header_dir="${with_sysroot}/usr/include"
+       fi
+      else
+       glibc_header_dir=/usr/include
+      fi
+      grep '^[         ]*#[    ]*define[       ][      ]*__LONG_DOUBLE_MATH_OPTIONAL' \
+        $glibc_header_dir/bits/wordsize.h > /dev/null 2>&1 \
+      && gcc_cv_target_ldbl128=yes])
+    ;;
+esac
+if test x$gcc_cv_target_ldbl128 = xyes; then
+  AC_DEFINE(TARGET_DEFAULT_LONG_DOUBLE_128, 1,
+           [Define if TFmode long double should be the default])
+fi
+
 # Find out what GC implementation we want, or may, use.
 AC_ARG_WITH(gc,
 [  --with-gc={page,zone}   choose the garbage collection mechanism to use