From: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Date: Sat, 9 Jun 2018 11:12:52 +0000 (+0200)
Subject: meson: do not allow bit-shift overflows
X-Git-Tag: v239~106
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b05ecb8cadd8c32d31b1aabcff4e507bd89b5465;p=thirdparty%2Fsystemd.git

meson: do not allow bit-shift overflows

The primary motivation is to catch enum values created through a shift that is
too big:

../src/test/test-sizeof.c:26:29: error: left shift count >= width of type [-Werror=shift-count-overflow]
         enum_with_shift = 1 << 32,
                             ^~
cc1: some warnings being treated as errors

The compiler will now reject those.

This is an alternative to #9224.
---

diff --git a/meson.build b/meson.build
index a4c2368df94..29ee446d564 100644
--- a/meson.build
+++ b/meson.build
@@ -319,6 +319,7 @@ possible_cc_flags = [
         '-Wstrict-aliasing=2',
         '-Wwrite-strings',
         '-Werror=overflow',
+        '-Werror=shift-count-overflow',
         '-Wdate-time',
         '-Wnested-externs',
         '-ffast-math',