I'm compiling GCC 5.3.0 for OS X. I am emailing this list to find out whether misuse of the compiler flags is causing this error or whether this is worthy of a bug report. Specifically compiling it for: OS X El Capitan 10.11.3 Intel(R) Core(TM) i5-4258U CPU @ 2.40GHz The following command-line causes an internal compiler error: CFLAGS_FOR_BUILD="-march=native -mtune=native" CXXFLAGS_FOR_BUILD="-march=native -mtune=native" CFLAGS="-march=native -mtune=native -mfpmath=sse" CPPFLAGS="-march=native -mtune=native -mfpmath=sse" ../configure --prefix=/home/setech/Local/usr/local/ --with-mpc=/home/setech/Local/usr/local/ --with-gmp=/home/setech/Local/usr/local/ --with-mpfr=/home/setech/Local/usr/local/ --with-isl=/home/setech/Local/usr/local/ --enable-languages=c,c++ -v && make -j 3 Without the -mtune and -march options, make completes without verbal error. The exact place of error is: ../../../../libquadmath/math/rem_pio2q.c:587:1: internal compiler error: in gen_reg_rtx, at emit-rtl.c:1027 Some context in the compilation process: xgcc: internal compiler error: Abort trap: 6 (program cc1) Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. make[6]: *** [math/rem_pio2q.lo] Error 1 make[5]: *** [all] Error 2 make[4]: *** [multi-do] Error 1 make[3]: *** [all-multi] Error 2 make[2]: *** [all] Error 2 make[1]: *** [all-target-libquadmath] Error 2 make[1]: *** Waiting for unfinished jobs.... The host compiler is Xcode's version of GCC (LLVM). `gcc --version` returns: Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 Apple LLVM version 7.0.2 (clang-700.1.81) Target: x86_64-apple-darwin15.3.0 Thread model: posix MPFR: 3.1.4 MPC: 1.0.3 GMP: 6.1.0 ISL: 0.16.1 - Seth
