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[Bug c/71157] -Wnull-dereference false alarm in wrong function
- From: "eggert at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 19 May 2016 22:40:00 +0000
- Subject: [Bug c/71157] -Wnull-dereference false alarm in wrong function
- Auto-submitted: auto-generated
- References: <bug-71157-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71157
--- Comment #4 from Paul Eggert <eggert at gnu dot org> ---
I worked around the GCC bug by applying the attached file etags.c.patch to GNU
Emacs. etags.c.patch replaces some weird but valid C code (add a small constant
to a pointer and test whether the resulting pointer is non-null, a test that
always yields 1) with more-normal code (add a small constant to a pointer, then
yield 1). After preprocessing, this yields the attached file e-patched.i, and
the command 'gcc -O2 -S -Wnull-dereference e-patched.i' does not issue the
bogus warnings.