http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57621
Bug ID: 57621
Summary: -Og
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: naruse at airemix dot jp
Folloing program is to verify func's argument is not larger than 3 at compile
time.
And this program uses valid argument 0.
Threfore I want the code is compiled without error.
This idea works on -O, -O1, -O2, -O3, -Os.
But on -Og, it fails with attribute error.
Of course it is not what I want, but is this intended behavior?
% cat og.c
#include <stdio.h>
int ruby$safe_level$4(void) __attribute__((error("$SAFE=4 is obsolete")));
#define func(a) (__builtin_constant_p(a) && (a) > 3) ? ruby$safe_level$4() :
(a)
struct foo {
int n;
};
void show(struct foo *p) {
printf("%d\n", func(p->n));
}
void hoge(void) {
struct foo f;
f.n = 0;
show(&f);
}
int main(void) {
hoge();
return 0;
}
% gcc49 -O og.c && ./a.out
0
% gcc49 -Og og.c && ./a.out
og.c: In function 'show':
og.c:9:11: error: call to 'ruby$safe_level$4' declared with attribute error:
$SAFE=4 is obsolete
printf("%d\n", func(p->n));
^
% gcc49 -v
Using built-in specs.
COLLECT_GCC=gcc49
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc49/gcc/x86_64-portbld-freebsd9.1/4.9.0/lto-wrapper
Target: x86_64-portbld-freebsd9.1
Configured with: ./../gcc-4.9-20130526/configure --disable-nls
--libdir=/usr/local/lib/gcc49 --libexecdir=/usr/local/libexec/gcc49
--program-suffix=49 --with-as=/usr/local/bin/as --with-gmp=/usr/local
--with-gxx-include-dir=/usr/local/lib/gcc49/include/c++/
--with-ld=/usr/local/bin/ld --with-libiconv-prefix=/usr/local
--with-pkgversion='FreeBSD Ports Collection' --with-system-zlib
--disable-libgcj --enable-languages=c,c++,objc,fortran --prefix=/usr/local
--mandir=/usr/local/man --infodir=/usr/local/info/gcc49
--build=x86_64-portbld-freebsd9.1
Thread model: posix
gcc version 4.9.0 20130526 (experimental) (FreeBSD Ports Collection)
% uname -a
FreeBSD windy.airemix.net 9.1-RELEASE-p3 FreeBSD 9.1-RELEASE-p3 #0: Mon Apr 29
18:27:25 UTC 2013
[email protected]:/usr/obj/usr/src/sys/GENERIC amd64
