diff mbox series

Supress false positive warning GCC -O3

Message ID CAJOr74i4=yQ+46i_ux9LU4LNrxKNZs4UA=_MBwLGUHbQAuyWug@mail.gmail.com
State Superseded
Headers
Series Supress false positive warning GCC -O3 |

Commit Message

Phi Jan. 9, 2025, 5:36 p.m. UTC 
  Building with gcc -O3 bring false positive warning. This is a GCC bug, and
this patch is a work around.

This is reported at
https://sourceware.org/bugzilla/show_bug.cgi?id=32527

Cheers,
Phi
diff mbox series

Patch

From 3ac65cf6eec36a9a22af378e89bc4d5b148d8713 Mon Sep 17 00:00:00 2001
From: Philippe Benard <phi.debian@gmail.com>
Date: Thu, 9 Jan 2025 14:59:00 +0100
Subject: [PATCH] libcpu: Remove false positive null ptr deref warning for GCC
 -O3

See bugzilla Bug#32527

* libcpu/Makefile.am
i386_lex_CFLAGS += $(subst -O3,-Wno-null-dereference,$(findstring -O3,$(CFLAGS)))

i386_lex_CFLAGS is a make variable to tweak the i386_lex.c.o
specific compile flags. The are already some -W defined there, I'd
like to add one to avoid seeing false warning during build with -O3
compile flag.

GCC 14.2 (as well as 13.x) produce a false positive warning for the
i386 lexer, a bug is filled already against GCC for that, CLANG is
imune.

Signed-off-by: Philippe Benard <phi.debian@gmail.com>
---
 libcpu/Makefile.am | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libcpu/Makefile.am b/libcpu/Makefile.am
index 32835237..2e87021b 100644
--- a/libcpu/Makefile.am
+++ b/libcpu/Makefile.am
@@ -91,6 +91,8 @@  libeu = ../lib/libeu.a
 
 i386_lex_CFLAGS = -Wno-unused-label -Wno-unused-function -Wno-sign-compare \
 		  -Wno-implicit-fallthrough
+i386_lex_CFLAGS += $(subst -O3,-Wno-null-dereference,$(findstring -O3,$(CFLAGS)))
+
 i386_parse.o: i386_parse.c i386.mnemonics
 i386_lex.o: i386_parse.h
 i386_gendis_LDADD = $(libeu) -lm $(obstack_LIBS)
-- 
2.43.0