https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97858
Bug ID: 97858
Summary: [11 regression] Bogus warnings about va_list during
profiledbootstrap
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hubicka at gcc dot gnu.org
Target Milestone: ---
During profiledbootstrap we get the following warnings:
../libcpp/../../libcpp/mkdeps.c: In function ‘munge.constprop’:
../libcpp/../../libcpp/mkdeps.c:176:13: warning: ‘MEM[(struct
*)&args].reg_save_area’ may be used uninitialized [-Wmaybe-uninitialized]
176 | str = va_arg (args, const char *);
| ^
../libcpp/../../libcpp/mkdeps.c:120:11: note: ‘MEM[(struct
*)&args].reg_save_area’ was declared here
120 | va_list args;
| ^
../libcpp/../../libcpp/mkdeps.c:176:13: warning: ‘MEM[(struct
*)&args].overflow_arg_area’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
176 | str = va_arg (args, const char *);
| ^
../libcpp/../../libcpp/mkdeps.c:120:11: note: ‘MEM[(struct
*)&args].overflow_arg_area’ was declared here
120 | va_list args;
| ^
../libcpp/../../libcpp/mkdeps.c:176:13: warning: ‘MEM[(struct
*)&args].gp_offset’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
176 | str = va_arg (args, const char *);
| ^
../libcpp/../../libcpp/mkdeps.c:120:11: note: ‘MEM[(struct *)&args].gp_offset’
was declared here
120 | va_list args;
| ^
This seems to be due to conditional initialization of va_list:
static const char *
munge (const char *str, const char *trail = NULL, ...)
{
static unsigned alloc;
static char *buf;
unsigned dst = 0;
va_list args;
if (trail)
va_start (args, trail);
but it does not make much sense to me to warn about internals of va_arg
iplementation at first place. It is not user visible.
