On 10 September 2015 at 01:30, HK wrote: > I've just run across this strange behavior on a recent 32bit installation: > > vega> cat hello.c > #include <stdio.h> > int main(int argc, char** argv){ > printf("hello world\n"); > } > vega> gcc -mfpmath=sse hello.c > hello.c:1:0: warning: SSE instruction set disabled, using 387 arithmetics
Does it help to use `-march=native`? My hunch is that this is because the default CPU type is set to such that does not have SSE. > #include <stdio.h> > ^ > > Why is this? I am pretty sure this used to work in the past. On the 64bit > installtion it works just fine. > > For reference: > > vega> gcc -v > Using built-in specs. > COLLECT_GCC=gcc > COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-cygwin/4.9.3/lto-wrapper.exe > Target: i686-pc-cygwin > Configured with: > /cygdrive/i/szsz/tmpp/gcc/gcc-4.9.3-1.i686/src/gcc-4.9.3/configure > --srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.3-1.i686/src/gcc-4.9.3 > --prefix=/usr --exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc > --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C > --build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin > --without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib > --enable-shared --enable-shared-libgcc --enable-static > --enable-version-specific-runtime-libs --enable-bootstrap > --enable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic > --disable-sjlj-exceptions > --enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite > --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm > --enable-libquadmath --enable-libquadmath-support --enable-libssp > --enable-libada --enable-libjava --enable-libgcj-sublibs --disable-java-awt > --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld > --with-gnu-as --with-cloog-include=/usr/include/cloog-isl > --without-libiconv-prefix --without-libintl-prefix --with-system-zlib > --enable-linker-build-id > Thread model: posix > gcc version 4.9.3 (GCC) > vega> -- VH -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple