From: Bart Van Assche <bvanassche@acm.org>
Date: Mon, 23 Jun 2008 12:11:49 +0000 (+0000)
Subject: Pass the flag -Wno-format-zero-length to gcc (if supported by gcc) while compiling... 
X-Git-Tag: svn/VALGRIND_3_4_0~442
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cf513b069662d5330ce07311a25fd29f3bd34f2;p=thirdparty%2Fvalgrind.git

Pass the flag -Wno-format-zero-length to gcc (if supported by gcc) while compiling tools. This flag only affects those tools for which -Wformat is enabled (at this time only exp-drd).

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8270
---

diff --git a/Makefile.flags.am b/Makefile.flags.am
index 14ad4bea59..1945177470 100644
--- a/Makefile.flags.am
+++ b/Makefile.flags.am
@@ -3,6 +3,7 @@
 # performance and get whatever useful warnings we can out of gcc.
 AM_CFLAGS_BASE = -O2 -g -Wmissing-prototypes -Wall -Wshadow \
                  -Wpointer-arith -Wstrict-prototypes -Wmissing-declarations \
+		 @FLAG_W_NO_FORMAT_ZERO_LENGTH@ \
                  -fno-strict-aliasing
 
 # These flags are used for building the preload shared objects.
diff --git a/configure.in b/configure.in
index a6a53a891f..3e5e233678 100644
--- a/configure.in
+++ b/configure.in
@@ -985,6 +985,29 @@ if test x$declaration_after_statement = xyes; then
 fi
 
 
+# does this compiler support -Wno-format-zero-length ?
+
+AC_MSG_CHECKING([if gcc accepts -Wno-format-zero-length])
+
+safe_CFLAGS=$CFLAGS
+CFLAGS="-Wno-format-zero-length"
+
+AC_TRY_COMPILE(
+[ ],
+[
+  return 0;
+],
+[
+AC_SUBST([FLAG_W_NO_FORMAT_ZERO_LENGTH], [-Wno-format-zero-length])
+AC_MSG_RESULT([yes])
+],
+[
+AC_SUBST([FLAG_W_NO_FORMAT_ZERO_LENGTH], [])
+AC_MSG_RESULT([no])
+])
+CFLAGS=$safe_CFLAGS
+
+
 # does this compiler support -Wextra or the older -W ?
 
 AC_MSG_CHECKING([if gcc accepts -Wextra or -W])