Target MLIREmitCAllTests does not link with Debug configuration

[OliverScherf]

When Building and Linking the MLIREmitCAllTests target in Debug mode the following linker errors occur:

build] [8/8 100% :: 3.835] Linking CXX executable unittests/MLIREmitCAllTests
[build] FAILED: unittests/MLIREmitCAllTests 
[build] : && /bin/clang++-10  -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough  -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fdiagnostics-color -g   unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_mhlo.cpp.o unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_std.cpp.o unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_tensor.cpp.o  -o unittests/MLIREmitCAllTests  /home/oliver/git/install-mlir/lib/libLLVMSupport.a  /home/oliver/git/install-mlir/lib/libLLVMSupport.a  -lpthread  lib/libgtest_maind.a  lib/libgtestd.a  -lpthread  -lrt  -ldl  -lm  /usr/lib/x86_64-linux-gnu/libz.so  /usr/lib/x86_64-linux-gnu/libtinfo.so  /home/oliver/git/install-mlir/lib/libLLVMDemangle.a  -lpthread && :
[build] /bin/ld: unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_tensor.cpp.o: in function `(anonymous namespace)::tensor_meta_is_tensor_0d_Test::TestBody()':
[build] /home/oliver/git/mlir-emitc/build/../unittests/emitc_tensor.cpp:358: undefined reference to `is_tensor_of_dim<0ul, Tensor<unsigned short>, void>::value'
[build] /bin/ld: unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_tensor.cpp.o: in function `(anonymous namespace)::tensor_meta_is_tensor_1d_Test::TestBody()':
[build] /home/oliver/git/mlir-emitc/build/../unittests/emitc_tensor.cpp:377: undefined reference to `is_tensor_of_dim<1ul, Tensor<signed char, 12ul>, void>::value'
[build] /bin/ld: unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_tensor.cpp.o: in function `(anonymous namespace)::tensor_meta_is_tensor_2d_Test::TestBody()':
[build] /home/oliver/git/mlir-emitc/build/../unittests/emitc_tensor.cpp:396: undefined reference to `is_tensor_of_dim<2ul, Tensor<double, 3ul, 7ul>, void>::value'
[build] /bin/ld: unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_tensor.cpp.o: in function `(anonymous namespace)::tensor_meta_is_tensor_3d_Test::TestBody()':
[build] /home/oliver/git/mlir-emitc/build/../unittests/emitc_tensor.cpp:415: undefined reference to `is_tensor_of_dim<3ul, Tensor<float, 1ul, 4ul, 6ul>, void>::value'
[build] /bin/ld: unittests/CMakeFiles/MLIREmitCAllTests.dir/emitc_tensor.cpp.o: in function `(anonymous namespace)::tensor_meta_is_tensor_4d_Test::TestBody()':
[build] /home/oliver/git/mlir-emitc/build/../unittests/emitc_tensor.cpp:434: undefined reference to `is_tensor_of_dim<4ul, Tensor<unsigned char, 2ul, 1ul, 1ul, 9ul>, void>::value'

MLIR emitC Commit: d5a5f63a4abb96ef754531bac9a84180a2c04648 (cgo Branch)
LLVM Commit: d4e889f1f5723105dbab12b749503d2462eb1755
LLVM Build Type Release

When I build MLIREmitCAllTests in Release mode, everything compiles and links correctly.

[marbre]

Yes, I can reproduce this. The breakage was introduced with commit 0455091. @simon-camp as you authored that commit, can you please take a look?

[simon-camp]

I fixed this in 7efa4da by instantiating the templates outside of the test macros. I don't know why it worked in release but not in debug builds though.

[marbre]

Thanks for the fix Simon!