http://sourceware.org/bugzilla/show_bug.cgi?id=12761
Summary: .gnu.warning.* doesn't work when building shared
library
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sources.redhat.com
ReportedBy: hjl.to...@gmail.com
[hjl@gnu-mic-1 warn-5]$ cat foo.c
extern void bar ();
void
foo ()
{
bar ();
}
[hjl@gnu-mic-1 warn-5]$ cat bar.c
#define linker_warning(x, msg) \
static const char __warn_##x[] \
__attribute__((used, section(".gnu.warning." #x))) \
= msg
void bar (void) {}
linker_warning(bar, "Bad bar");
[hjl@gnu-mic-1 warn-5]$ make
/usr/gcc-4.6/bin/gcc -O2 -fPIC -c -o foo.o foo.c
/usr/gcc-4.6/bin/gcc -O2 -fPIC -c -o bar.o bar.c
/usr/gcc-4.6/bin/gcc -Wl,-e,foo -nostdlib -o x1 foo.o bar.o
foo.o: In function `foo':
foo.c:(.text+0x3): warning: Bad bar
/usr/gcc-4.6/bin/gcc -shared -nostdlib -o x2 foo.o bar.o
[hjl@gnu-mic-1 warn-5]$ ./ld.gold -shared -o x2 foo.o bar.o
foo.o:foo.c:function foo: warning: Bad bar
[hjl@gnu-mic-1 warn-5]$
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