https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61824
--- Comment #2 from Andrew Benson <abensonca at gmail dot com> --- No problem. Here's the output: $ gfortran -c tmp3.F90 -o tmp3.o -march=native -v Using built-in specs. COLLECT_GCC=gfortran COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) COLLECT_GCC_OPTIONS='-c' '-o' 'tmp3.o' '-march=native' '-v' /usr/lib/gcc/x86_64-linux-gnu/4.6/f951 tmp3.F90 -cpp=/tmp/ccJLj4Nw.f90 -quiet -v -imultilib . -imultiarch x86_64-linux-gnu tmp3.F90 -march=amdfam10 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mabm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-tbm -mno-avx -mno-sse4.2 -mno-sse4.1 --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=512 -mtune=amdfam10 -quiet -dumpbase tmp3.F90 -auxbase-strip tmp3.o -version -fintrinsic-modules-path /usr/lib/gcc/x86_64-linux-gnu/4.6/finclude -o /tmp/ccBjcPAR.s GNU Fortran (Ubuntu/Linaro 4.6.3-1ubuntu5) version 4.6.3 (x86_64-linux-gnu) compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../x86_64-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-linux-gnu/4.6/finclude /opt/intel/composer_xe_2013_sp1.1.106/mkl/include /opt/intel/composer_xe_2013_sp1.1.106/tbb/include /usr/lib/gcc/x86_64-linux-gnu/4.6/include /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/4.6/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. GNU Fortran (Ubuntu/Linaro 4.6.3-1ubuntu5) version 4.6.3 (x86_64-linux-gnu) compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 COLLECT_GCC_OPTIONS='-c' '-o' 'tmp3.o' '-march=native' '-v' as --64 -o tmp3.o /tmp/ccBjcPAR.s COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.6/:/usr/lib/gcc/x86_64-linux-gnu/4.6/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.6/:/usr/lib/gcc/x86_64-linux-gnu/ LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.6/:/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/opt/intel/composer_xe_2013_sp1.1.106/compiler/lib/intel64/:/opt/intel/composer_xe_2013_sp1.1.106/ipp/../compiler/lib/intel64/:/opt/intel/composer_xe_2013_sp1.1.106/ipp/lib/intel64/:/opt/intel/composer_xe_2013_sp1.1.106/compiler/lib/intel64/:/opt/intel/composer_xe_2013_sp1.1.106/mkl/lib/intel64/:/opt/intel/composer_xe_2013_sp1.1.106/tbb/lib/intel64/gcc4.4/:/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-c' '-o' 'tmp3.o' '-march=native' '-v'