From: Lucas De Marchi <lucas.demarchi@intel.com>
Date: Tue, 25 Mar 2014 02:50:24 +0000 (-0300)
Subject: build-sys: try harder to shut up compiler wrt strict-aliasing
X-Git-Tag: v17~11
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=db62153ea0beedbc6941e1d438c0b6e7189e78d9;p=thirdparty%2Fkmod.git

build-sys: try harder to shut up compiler wrt strict-aliasing

With -Wstrict-aliasing=2 we get the following warning:

	libkmod/libkmod-signature.c:124:20: note: in expansion of macro 'get_unaligned'
	  sig_len = be32toh(get_unaligned(&modsig->sig_len));

However there's nothing wrong with it. modsig->sig_len is uint32_t and
get_unaligned in this case returns uint32_t. There's notstrict aliasing
violation.
---

diff --git a/configure.ac b/configure.ac
index e95942a0..f2070c61 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,7 +164,7 @@ CC_CHECK_FLAGS_APPEND(with_cflags, [CFLAGS], [\
 		       -Wmissing-noreturn \
 		       -Wshadow \
 		       -Wendif-labels \
-		       -Wstrict-aliasing=2 \
+		       -Wstrict-aliasing=3 \
 		       -Wwrite-strings \
 		       -Wno-long-long \
 		       -Wno-overlength-strings \