[llvm-dev] LLVM linking problem

[Russell Wallace via llvm-dev]

When I use clang on Windows to compile a program using regular expressions
to intermediate code, then run the result through llvm-link and finally try
to generate an executable, I get an error.

All of these ingredients are necessary; it works if the program doesn't use
regular expressions, and it works if I compile it directly instead of going
via intermediate code.

The use of the exact llvm-link binary, however, is not a necessary
ingredient; I get the same result with a linking program of my own that
uses the same libraries as llvm-link.

Minimal test case:

C:\test>type test.cpp
#include <regex>

int main() {
  std::cmatch m;
  regex_match("a", m, std::regex("a"));
  return 0;
}

C:\test>clang-cl -Xclang -emit-llvm -c -fms-compatibility-version=19
test.cpp

C:\test>move test.obj test.ll
Overwrite C:\test\test.ll? (Yes/No/All): y
        1 file(s) moved.

C:\test>llvm-link test.ll -o=a.ll

C:\test>clang-cl -Wno-override-module a.ll
a-e22d14.obj : fatal error LNK1243: invalid or corrupt file: COMDAT section
0x373 associated with following section 0x389
clang-cl.exe: error: linker command failed with exit code 1243 (use -v to
see invocation)

C:\test>llvm-link -version
LLVM (http://llvm.org/):
  LLVM version 3.7.0
  DEBUG build.
  Default target: x86_64-pc-windows-msvc
  Host CPU: sandybridge
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