[LLVMdev] Clang64 on Windows using Mingw64 yields many linking errors?

[Mikael Lyngvig]

Hi again,

I am regularly building my small STL-enabled C++ project using Mingw64 on
Windows x64 and the program runs fine (it builds and runs fine on x64 Linux
too).

Then I got brave and decided to try out Clang, because I'd eventually like
to take a look at the quality of the generated code, and then did the
following:

1. Set CC to clang.
2. Set CXX to clang++.
3. Run cmake and let it figure out that its using Clang on Windows.
4. Build and realize that the link doesn't work because CMake pulls in the
wrong libraries (per default it uses Microsoft naming conventions: foo.lib
instead of libfoo.a).
5. Search good old Google and find this VERY helpful article:
http://thread.gmane.org/gmane.comp.programming.tools.cmake.user/42398
6. Fix CMake as per the above.
7. Build and realize that the CMake pulls in the right libraries but still
a torrent of errors are reported:

..\libBackend.a(Backend.cpp.obj):fake:(.rdata$ZTIN10Braceless07BackendE+0xffffffffff6e88a0):
Cannot get section contents - auto-impo
rt exception
..\libBackend.a(Backend.cpp.obj):fake:(.data+0xfffffffffffffd00): Cannot
get section contents - auto-import exception
..\libDriver.a(Setup.cpp.obj):fake:(.text$ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs+0xffffffffffffb34d):
Cannot get section contents - auto-import exception
..\libDriver.a(Setup.cpp.obj):fake:(.text$ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs+0xffffffffffffb42e):
Cannot get section contents - auto-import exception
..\libDriver.a(Setup.cpp.obj):fake:(.text$ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs+0xffffffffffffb458):
Cannot get section contents - auto-import exception
..\libDriver.a(Setup.cpp.obj):fake:(.text$ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs+0xffffffffffffb59a):
Cannot get section contents - auto-import exception
..\libDriver.a(Setup.cpp.obj):fake:(.text$ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs+0xffffffffffffb5c5):
Cannot get section contents - auto-import exception
..\libDriver.a(Setup.cpp.obj):fake:(.text$ZNSt20__uninitialized_copyILb0EE13__uninit_copyIPSsS2_EET0_T_S4_S3_+0xffffffffffff6203):
Cannot get section contents - auto-import exception

Is it because Clang does not support the Mingw64 ABI?   I was under the
impression that Clang DID support the Mingw32/64 toolchains, but perhaps it
is only the 32-bit version?


Cheers,
Mikael
-- Love Thy Frog!
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