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Date:	Wed, 18 Nov 2015 18:07:08 -0500
From:	Tim Prince <n8tm AT aol DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: gfortran segfaults on "Hello world"
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On 11/18/2015 5:26 PM, Thomas Koenig wrote:
> Hi,
>
> gfortran appears to be broken (segfault) with the newest cygwin
> version I just downloaded. It segfaults on a "Hello, world" program.
> gcc works fine.
>
> The warnings on the GMP and MPFR headers make me suspect that some
> dependency may be broken.
>
> Here's what happens:
>
> $ gfortran.exe hello.f
> <built-in>: internal compiler error: Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
>
> $ which gfortran
> /usr/bin/gfortran
>
> $ ldd /usr/lib/gcc/x86_64-pc-cygwin/4.9.3/f951.exe
>          ntdll.dll => /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> (0x7ff96d540000)
>          KERNEL32.DLL => /cygdrive/c/Windows/system32/KERNEL32.DLL
> (0x7ff96b8d0000)
>          KERNELBASE.dll => /cygdrive/c/Windows/system32/KERNELBASE.dll
> (0x7ff96a760000)
>          cygcloog-isl-4.dll => /usr/bin/cygcloog-isl-4.dll (0x3fc700000)
>          cygwin1.dll => /usr/bin/cygwin1.dll (0x180040000)
>          cyggmp-10.dll => /usr/bin/cyggmp-10.dll (0x3fb610000)
>          cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x3fa2f0000)
>          cygintl-8.dll => /usr/bin/cygintl-8.dll (0x3f69d0000)
>          cygisl-10.dll => /usr/bin/cygisl-10.dll (0x3f68e0000)
>          cygmpc-3.dll => /usr/bin/cygmpc-3.dll (0x3f63f0000)
>          cygmpfr-4.dll => /usr/bin/cygmpfr-4.dll (0x3f6390000)
>          cygz.dll => /usr/bin/cygz.dll (0x3f4930000)
>          cyggcc_s-seh-1.dll => /usr/bin/cyggcc_s-seh-1.dll (0x3fbc50000)
>
> $ gfortran -v hello.f
> Driving: gfortran -v hello.f -l gfortran -shared-libgcc
> Using built-in specs.
> COLLECT_GCC=gfortran
> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/4.9.3/lto-wrapper.exe
> Target: x86_64-pc-cygwin
> Configured with:
> /cygdrive/i/szsz/tmpp/gcc/gcc-4.9.3-1.x86_64/src/gcc-4.9.3/configure
> --srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.3-1.x86_64/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=x86_64-pc-cygwin --host=x86_64-pc-cygwin
> --target=x86_64-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-tune=generic
> --enable-languages=ada,c,c++,fortran,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-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)
> COLLECT_GCC_OPTIONS='-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
>   /usr/lib/gcc/x86_64-pc-cygwin/4.9.3/f951.exe hello.f -ffixed-form
> -quiet -dumpbase hello.f -mtune=generic -march=x86-64 -auxbase hello
> -version -fintrinsic-modules-path
> /usr/lib/gcc/x86_64-pc-cygwin/4.9.3/finclude -o /tmp/ccsadurw.s
> GNU Fortran (GCC) version 4.9.3 (x86_64-pc-cygwin)
>          compiled by GNU C version 4.9.3, GMP version 6.0.0, MPFR
> version 3.1.2-p11, MPC version 1.0.3
> warning: GMP header version 6.0.0 differs from library version 6.1.0.
> warning: MPFR header version 3.1.2-p11 differs from library version 3.1.3.
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> GNU Fortran (GCC) version 4.9.3 (x86_64-pc-cygwin)
>          compiled by GNU C version 4.9.3, GMP version 6.0.0, MPFR
> version 3.1.2-p11, MPC version 1.0.3
> warning: GMP header version 6.0.0 differs from library version 6.1.0.
> warning: MPFR header version 3.1.2-p11 differs from library version 3.1.3.
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> <built-in>: internal compiler error: Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
>
> Any ideas?
>
upgrade gmp and mpfr to current versions.  I prefer the gfortran 5.2 
binary, or a 6.0 bootstrapped from 5.2, all using those current cygwin 
gmp and mpfr releases.
-- 
Tim Prince

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