PR c++/27804

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

diff --git a/gcc/configure.ac b/gcc/configure.ac
index a055581..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
+
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 # Threading
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