http://llvm.org/bugs/show_bug.cgi?id=15744
Bug ID: 15744
Summary: extern "C" linkage ignored for a static function
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
A static function may be called unmangled by asm() within another function
or from a function defined entirely within asm(). The latter is what
firefox does on i386 linux and bsd e.g.,
https://mxr.mozilla.org/mozilla-central/source/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_gcc_x86_unix.cpp#85
https://mxr.mozilla.org/mozilla-central/source/xpcom/reflect/xptcall/src/md/unix/xptcstubs_gcc_x86_unix.cpp#121
// a simple testcase
extern "C"
{
__attribute__((__used__))
static void
foo(void)
{
}
}
asm("call foo");
$ clang++33 -c test.cc
$ objdump -t test.o | fgrep foo
0000000000000010 l F .text 0000000000000006 _Z3foov
0000000000000000 *UND* 0000000000000000 foo
$ clang++32 -c test.cc
$ objdump -t test.o | fgrep foo
0000000000000010 l F .text 0000000000000001 foo
$ g++48 -c test.cc
$ objdump -t test.o | fgrep foo
0000000000000000 l F .text 0000000000000006 foo
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