llvm dev - Feb 2016 - Error cross building LLVM for MinGW

Hi,

I recently switched over to using cmake to build my clang/LLVM based 
ELLCC cross development project (http://ellcc.org). I also recently 
updated to LLVM svn version 258915 from 258477.

I use ELLCC to cross compile all the tools for various Linux targets and 
for Windows. Yesterday, after updating the LLVM sources, I got the 
following error when cross building for MinGW:

[  3%] Built target LLVMSupport
[  3%] Built target LLVMTableGen
[  4%] Built target obj.llvm-tblgen
[  4%] Linking CXX executable ../../bin/llvm-tblgen
/home/rich/ellcc-release/bin/../libecc/mingw/x86_64-w64-mingw32/sys-root/mingw/lib/libstdc++.a(string-inst.o):
In function `std::basic_string<char, std::char_traits<char>, 
std::allocator<char> > std::operator+<char,
std::char_traits<char>,
std::allocator<char> >(char const*, std::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)':
/builddir/build/BUILD/gcc-4.9.2/build_win64/x86_64-w64-mingw32/libstdc++-v3/include/bits/basic_string.tcc:692:
multiple definition of `std::basic_string<char, std::char_traits<char>,
std::allocator<char> > std::operator+<char,
std::char_traits<char>,
std::allocator<char> >(char const*, std::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)'
CMakeFiles/obj.llvm-tblgen.dir/AsmMatcherEmitter.cpp.o:(.text[_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_EPKS3_RKS6_]+0x0):
first defined here
clang-3.9: error: linker command failed with exit code 1 (use -v to see 
invocation)
utils/TableGen/CMakeFiles/llvm-tblgen.dir/build.make:135: recipe for 
target 'bin/llvm-tblgen' failed
make[2]: *** [bin/llvm-tblgen] Error 1
CMakeFiles/Makefile2:383: recipe for target 
'utils/TableGen/CMakeFiles/llvm-tblgen.dir/all' failed
make[1]: *** [utils/TableGen/CMakeFiles/llvm-tblgen.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2

Does anyone have any idea what I might have done to cause this?

-Rich

Richard Pennington via llvm-dev <llvm-dev <at> lists.llvm.org>
writes:
> I use ELLCC to cross compile all the tools for various Linux targets and 
> for Windows. Yesterday, after updating the LLVM sources, I got the 
> following error when cross building for MinGW:
I haven't seen this exact error (I build in a similar configuration),
but I don't check trunk every day so it sounds new. Worth bisecting?
Is there an easy binary installation method to replicate your mingw-cross
compiler configuration? I have some cross-build docker containers where
I'll try to reproduce with the versions of mingw that I've been using.

-Tony

On 02/17/2016 07:23 PM, Tony Kelman via llvm-dev wrote:
> Richard Pennington via llvm-dev <llvm-dev <at> lists.llvm.org>
writes:
>
>> I use ELLCC to cross compile all the tools for various Linux targets
and
>> for Windows. Yesterday, after updating the LLVM sources, I got the
>> following error when cross building for MinGW:
> I haven't seen this exact error (I build in a similar configuration),
> but I don't check trunk every day so it sounds new. Worth bisecting?
> Is there an easy binary installation method to replicate your mingw-cross
> compiler configuration? I have some cross-build docker containers where
> I'll try to reproduce with the versions of mingw that I've been
using.
>
> -Tony
>
Hi Tony,

I googled around a little bit and found this bug: 
https://llvm.org/bugs/show_bug.cgi?id=9744
The generated code is somewhat different, but the little test case fails 
for me in exactly the same way:

[~] dev% cat test.cpp
#include <stdio.h>
#include <string>
using std::string;
int main()
{
   string a(" test");
   a = "a" + a;
   printf("%s\n", a.c_str());
   return 0;
}
[~] dev% ~/ellcc/bin/ecc++ -target x86_64-w64-mingw32 test.cpp
/home/rich/ellcc/bin/../libecc/mingw/x86_64-w64-mingw32/sys-root/mingw/lib/libstdc++.a(string-inst.o):
In function `std::basic_string<char, std::char_traits<char>, 
std::allocator<char> > std::operator+<char,
std::char_traits<char>,
std::allocator<char> >(char const*, std::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)':
/builddir/build/BUILD/gcc-4.9.2/build_win64/x86_64-w64-mingw32/libstdc++-v3/include/bits/basic_string.tcc:692:
multiple definition of `std::basic_string<char, std::char_traits<char>,
std::allocator<char> > std::operator+<char,
std::char_traits<char>,
std::allocator<char> >(char const*, std::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)'
/tmp/test-1e978b.o:(.text[_ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_EPKS3_RKS6_]+0x0):
first defined here
clang-3.9: error: linker command failed with exit code 1 (use -v to see 
invocation)
[~] dev%

Strange.

-Rich