[LLVMbugs] [Bug 11697] New: Failure to link with LTO and -fvisibility-inlines-hidden

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11697

             Bug #: 11697
           Summary: Failure to link with LTO and
                    -fvisibility-inlines-hidden
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu,
                    rafael.espindola at gmail.com
    Classification: Unclassified


Given the following files:

a.h:
#include <cstdio>
class A;
template<typename T> struct LoopBase {
  __attribute((noinline)) int a() { printf("foo\n"); return 0; }
};

a.cpp:
#include <a.h>
template class LoopBase<A>;

b.cpp:
#include <a.h>
int main() { LoopBase<A> x; return x.a(); }

clang with "-O4 -fvisibility-inlines-hidden" fails to link with the following
error:
ld: lto: could not merge in
/var/folders/mb/c671t2cn7k385sks9twml1380000gn/T/b-GaJEgX.o because Linking
globals named '_ZN8LoopBaseI1AE1aEv': symbols have different visibilities! for
architecture x86_64

I'm pretty sure the C++ in question is valid; I'm not sure whether clang is
generating bad IR, or the IR linking is incorrectly rejecting the IR generated
by clang.

Rafael said he would take a look.

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