Getting error in dmd testsuite

[Thomas Mader via Digitalmars-d-learn]

Hello,

I am building ldc on Nix (https://nixos.org/nix/) but keep 
getting an error while running the cppa.d test from the dmd 
testsuite (https://github.com/ldc-developers/dmd-testsuite).

1588:  ... runnable/cppa.d                 -L-lstdc++ (-g) -O
1588: Test failed.  The logged output:
1588: /tmp/nix-build-ldc-1.3.0.drv-0/build/bin/ldmd2 -conf= -m64 
-Irunnable  -L-lstdc++  
-od/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable 
-of/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa_0 runnable/cppa.d /tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppb.cpp.o
1588: 
/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa_0.o: In function `_Dmain':
1588: runnable/cppa.d:(.text._Dmain[_Dmain]+0x49f): undefined 
reference to `int foo15372<int>(int)'
1588: runnable/cppa.d:(.text._Dmain[_Dmain]+0x4b2): undefined 
reference to `Foo15802<int>::boo(int)'
1588: 
/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa_0.o:(.data.rel.ro._D4cppa6C131616__vtblZ[_D4cppa6C131616__vtblZ]+0x0): undefined reference to `C13161::dummyfunc()'
1588: 
/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa_0.o:(.data.rel.ro._D4cppa4Test6__vtblZ[_D4cppa4Test6__vtblZ]+0x0): undefined reference to `C13161::dummyfunc()'
1588: 
/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa_0.o:(.data.rel.ro._D4cppa7C13161a6__vtblZ[_D4cppa7C13161a6__vtblZ]+0x0): undefined reference to `C13161a::dummyfunc()'
1588: 
/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa_0.o:(.data.rel.ro._D4cppa5Testa6__vtblZ[_D4cppa5Testa6__vtblZ]+0x0): undefined reference to `C13161a::dummyfunc()'
1588: collect2: error: ld returned 1 exit status
1588: Error: 
/nix/store/df84hkmhrhx1c2zpvrhmk6aprhlzkasx-gcc-wrapper-6.4.0/bin/gcc failed with status: 1
1588:
1588:
1588: ==============================
1588: Test failed: expected rc == 0, exited with rc == 1
1588:
1588: make[2]: *** [Makefile:335: 
/tmp/nix-build-ldc-1.3.0.drv-0/build/dmd-testsuite/runnable/cppa.d.out] Error 1

Apart from that all other tests pass.
Any ideas?

It's running on Linux with gcc 6.4.0.