From 61653dfb81b776bb72ce4304175b861d77c357a8 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@hack.frob.com>
Date: Mon, 14 May 2012 15:42:52 -0700
Subject: BZ#10375: Configure magic to use -U_FORTIFY_SOURCE if needed.

---
 configure.in | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index ce4b7ad..0916e9e 100644
--- a/configure.in
+++ b/configure.in
@@ -2036,6 +2036,22 @@ AC_CHECK_SIZEOF(long double, 0)
 sizeof_long_double=$ac_cv_sizeof_long_double
 AC_SUBST(sizeof_long_double)
 
+CPPUNDEFS=
+dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
+dnl Since we are building the implementations of the fortified functions here,
+dnl having the macro defined interacts very badly.
+AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
+[AC_TRY_COMPILE([], [
+#ifdef _FORTIFY_SOURCE
+# error bogon
+#endif],
+		[libc_cv_predef_fortify_source=no],
+		[libc_cv_predef_fortify_source=yes])])
+if test $libc_cv_predef_fortify_source = yes; then
+  CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
+fi
+AC_SUBST(CPPUNDEFS)
+
 ### End of automated tests.
 ### Now run sysdeps configure fragments.
 
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