[Bug ld/12760] LTO doesn't work with .gnu.warning section

[amodra at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12760

--- Comment #7 from Alan Modra <amodra at gmail dot com> 2011-05-16 13:52:20 
UTC ---
modified bar.c testing other warning sym cases

#define linker_warning(x, msg) \
    asm(".section .gnu.warning." #x "\n\t.previous"); \
    static const char __warn_##x[] \
    __attribute__((used, section(".gnu.warning." #x "\n\t#"))) \
    = msg

volatile int x;
void bar (void) { x++; }
linker_warning(bar, "should warn about bar");

void notcalled (void) { x--; }
linker_warning(notcalled, "linker bug, should not warn about notcalled");

linker_warning(notdef, "linker bug, should not warn about notdef");

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