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I've just tried this on a ppc64 box, using gcc-4.8.3-6.el7.ppc64. I removed the -mno-vsx line from the spec file, and eigen3 seems to build fine, including the testsuite. The .cpp file that we previously ICEd on seems to be compiled correctly now:
/usr/bin/c++ -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mcpu=power7 -mtune=power7 -fexceptions -pedantic -Wall -Wextra -Wundef -Wcast-align -Wchar-subscripts -Wnon-virtual-dtor -Wunused-local-typedefs -Wpointer-arith -Wwrite-strings -Wformat-security -Wno-psabi -Wno-variadic-macros -Wno-long-long -fno-check-new -fno-common -fstrict-aliasing -ansi -g2 -g0 -O2 -fno-inline-functions -Wl,-z,relro CMakeFiles/mapstaticmethods_6.dir/mapstaticmethods.cpp.o -o mapstaticmethods_6 -rdynamic
make[3]: Leaving directory `/root/rpmbuild/BUILD/eigen-eigen-6b38706d90a9/ppc64-redhat-linux-gnu'
/usr/bin/cmake -E cmake_progress_report /root/rpmbuild/BUILD/eigen-eigen-6b38706d90a9/ppc64-redhat-linux-gnu/CMakeFiles
[ 22%] Built target mapstaticmethods_6
So, can you try to build eigen3 with newer gcc, please?
You could either build eigen3 locally (in mock) with a new gcc (I hope I could upload the rpms somewhere for you), or just wait until RHEL7.1 is released - then the EPEL builders should be updated, though I'm not sure about EPEL builders at all.
Description of problem: Trying to compile eigen3 for EPEL7/ppc64 I get: /usr/bin/c++ -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mcpu=power7 -mtune=power7 -fexceptions -pedantic -Wall -Wextra -Wundef -Wcast-align -Wchar-subscripts -Wnon-virtual-dtor -Wunused-local-typedefs -Wpointer-arith -Wwrite-strings -Wformat-security -Wno-psabi -Wno-variadic-macros -Wno-long-long -fno-check-new -fno-common -fstrict-aliasing -ansi -g2 -g0 -O2 -fno-inline-functions -Wl,-z,relro CMakeFiles/product_mmtr_4.dir/product_mmtr.cpp.o -o product_mmtr_4 -rdynamic /usr/bin/c++ -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mcpu=power7 -mtune=power7 -fexceptions -pedantic -Wall -Wextra -Wundef -Wcast-align -Wchar-subscripts -Wnon-virtual-dtor -Wunused-local-typedefs -Wpointer-arith -Wwrite-strings -Wformat-security -Wno-psabi -Wno-variadic-macros -Wno-long-long -fno-check-new -fno-common -fstrict-aliasing -ansi -g2 -g0 -O2 -fno-inline-functions -Wl,-z,relro CMakeFiles/mapstaticmethods_6.dir/mapstaticmethods.cpp.o -o mapstaticmethods_6 -rdynamic rs6000_secondary_reload_inner:15249, type = load (parallel [ (set (reg:V4SI 77 0) (reg:V4SI 32 0)) (clobber (reg:DI 3 3)) ]) /builddir/build/BUILD/eigen-eigen-ffa86ffb5570/test/product_extra.cpp: In function 'void product_extra(const MatrixType&) [with MatrixType = Eigen::Matrix<std::complex<float>, -1, -1>]': /builddir/build/BUILD/eigen-eigen-ffa86ffb5570/test/product_extra.cpp:101:1: internal compiler error: in rs6000_secondary_reload_fail, at config/rs6000/rs6000.c:15222 } ^ http://koji.fedoraproject.org/koji/taskinfo?taskID=6518273 Version-Release number of selected component (if applicable): 4.8.2-3.el7