http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47934
Summary: LTO: function with attribute "used" is not emitted
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: d.g.gorbac...@gmail.com
============= bug.c =============
static void __attribute__((used))
foo(void)
{
}
int main(void)
{
__asm__("call foo");
return 0;
}
=================================
$ gcc -flto bug.c
/tmp/ccCtTmmT.ltrans0.ltrans.o: In function `main':
ccCtTmmT.ltrans0.o:(.text+0x4): undefined reference to `foo'
collect2: ld returned 1 exit status
>From GCC documentation:
`used'
This attribute, attached to a function, means that code must be
emitted for the function even if it appears that the function is
not referenced. This is useful, for example, when the function is
referenced only in inline assembly.
