llvm-isel-fuzzer: Weak function invoke the ire of PE/COFF

It's non-trivial to use weak symbols in a cross platform way (See
sanitizer_win_defs.h in compiler-rt), and doing it naively like we
have here causes some build failures:

  http://lab.llvm.org:8011/builders/clang-with-thin-lto-windows/builds/1260

Instead of going down the rabbit hole of emulating weak symbols for
this very trivial dummy fuzzer driver, we can just rely on the fact
that we know which hooks any given fuzz target implements and forward
declare a normal symbol.

llvm-svn: 312354

1 files changed, 1 insertions, 4 deletions

diff --git a/llvm/tools/llvm-isel-fuzzer/DummyISelFuzzer.cpp b/llvm/tools/llvm-isel-fuzzer/DummyISelFuzzer.cpp
index 929a63a541d..89c1c81cdbe 100644
--- a/llvm/tools/llvm-isel-fuzzer/DummyISelFuzzer.cpp
+++ b/llvm/tools/llvm-isel-fuzzer/DummyISelFuzzer.cpp
@@ -20,10 +20,7 @@
 using namespace llvm;
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
-extern "C" LLVM_ATTRIBUTE_WEAK int LLVMFuzzerInitialize(int *argc,
-                                                        char ***argv) {
-  return 0;
-}
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv);
 
 int main(int argc, char *argv[]) {
   errs() << "*** This tool was not linked to libFuzzer.\n"