* On 24 Dec 2012, Fabian Groffen wrote:
> On 18-10-2012 15:12:21 -0500, David Champion wrote:
> > +conststrings.c: txt2c config.status
> > + ( \
> > + $${CC-cc} --version || \
> > + $${CC-cc} -v || \
> > + $${CC-cc} -V || \
> > + echo "unknown compiler"; \
>
> I might have missed the discussion on this, but is there a reason why
> the final patch in the repository first runs -v and then --version? The
> difference for me is considerable:
There was a reason that I changed it. I wish that I'd documented it. :(
It had to do with exit status from various likely $(CC) candidates:
on some combination of platform and compiler, using --version first
resulted in no useful result, while exiting 0 so that -v never got a
chance. -v, then --version was the more reliable sequence. It may have
been an issue with an older clang/llvm -- perhaps a third-party clang on
OSX prior to Apple's switch from gcc to clang. It's not a problem on
10.8 with Apple clang, nor with Sun CC. AIX?
I've changed jobs and I no longer have access to the same set of
machines for testing, and I can no longer say what the particular break
was. To me the "too much output" result isn't a big problem but if you
want to send a patch to reverse those two options I'd be OK with it
until someone reports a real build problem in the wild, and then maybe
we need to look at more complex solutions such as case globbing.
> % x86_64-apple-darwin11-gcc --version
> x86_64-apple-darwin11-gcc (GCC) 4.2.1 (Gentoo 4.2.1_p5666-r1, Apple Inc.
> build 5666) (dot 3)
> Copyright (C) 2007 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> % sparcv9-sun-solaris2.10-gcc --version
> sparcv9-sun-solaris2.10-gcc (Gentoo 4.6.3 p1.7, pie-0.5.2) 4.6.3
> Copyright (C) 2011 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> compared to:
>
> % x86_64-apple-darwin11-gcc -v
> Using built-in specs.
> Target: x86_64-apple-darwin11
> Configured with:
> /Library/Gentoo/var/tmp/portage/sys-devel/gcc-apple-4.2.1_p5666-r1/work/gcc-5666.3/configure
> --prefix=/Library/Gentoo/usr
> --bindir=/Library/Gentoo/usr/x86_64-apple-darwin11/gcc-bin/4.2.1
> --includedir=/Library/Gentoo/usr/lib/gcc/x86_64-apple-darwin11/4.2.1/include
> --datadir=/Library/Gentoo/usr/share/gcc-data/x86_64-apple-darwin11/4.2.1
> --mandir=/Library/Gentoo/usr/share/gcc-data/x86_64-apple-darwin11/4.2.1/man
> --infodir=/Library/Gentoo/usr/share/gcc-data/x86_64-apple-darwin11/4.2.1/info
> --with-gxx-include-dir=/Library/Gentoo/usr/lib/gcc/x86_64-apple-darwin11/4.2.1/include/g++-v4
> --host=x86_64-apple-darwin11 --enable-version-specific-runtime-libs
> --build=x86_64-apple-darwin11 --enable-nls --without-included-gettext
> --with-system-zlib --disable-checking --disable-werror --enable-shared
> --enable-threads=posix --with-local-prefix=/Library/Gentoo/usr
> --with-as=/Library/Gentoo/usr/bin/x86_64-apple-darwin11-as
> --with-ld=/Library/Gentoo/usr/bin/x86_64-apple-darwin11-ld --disable-multilib
> --enable-languages=c,c++,objc,obj-c++,fortran --enable-libgomp
> Thread model: posix
> gcc version 4.2.1 (Gentoo 4.2.1_p5666-r1, Apple Inc. build 5666) (dot 3)
>
> % sparcv9-sun-solaris2.10-gcc -v
> Using built-in specs.
> COLLECT_GCC=/gentoo/prefix64/usr/sparcv9-sun-solaris2.10/gcc-bin/4.6.3/sparcv9-sun-solaris2.10-gcc
> COLLECT_LTO_WRAPPER=/gentoo/prefix64/usr/libexec/gcc/sparcv9-sun-solaris2.10/4.6.3/lto-wrapper
> Target: sparcv9-sun-solaris2.10
> Configured with:
> /gentoo/prefix64/var/tmp/portage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/configure
> --prefix=/gentoo/prefix64/usr
> --bindir=/gentoo/prefix64/usr/sparcv9-sun-solaris2.10/gcc-bin/4.6.3
> --includedir=/gentoo/prefix64/usr/lib/gcc/sparcv9-sun-solaris2.10/4.6.3/include
> --datadir=/gentoo/prefix64/usr/share/gcc-data/sparcv9-sun-solaris2.10/4.6.3
> --mandir=/gentoo/prefix64/usr/share/gcc-data/sparcv9-sun-solaris2.10/4.6.3/man
>
> --infodir=/gentoo/prefix64/usr/share/gcc-data/sparcv9-sun-solaris2.10/4.6.3/info
>
> --with-gxx-include-dir=/gentoo/prefix64/usr/lib/gcc/sparcv9-sun-solaris2.10/4.6.3/include/g++-v4
> --host=sparcv9-sun-solaris2.10 --build=sparcv9-sun-solaris2.10
> --disable-altivec --disable-fixed-point --without-ppl --without-cloog
> --enable-lto --enable-nls --without-included-gettext --with-system-zlib
> --enable-obsolete --disable-werror --enable-secureplt --disable-multilib
> --disable-libmudflap --enable-libssp --disable-libgomp
> --with-python-dir=/share/gcc-data/sparcv9-sun-solaris2.10/4.6.3/python
> --enable-checking=release --disable-libgcj --disable-libquadmath
> --enable-languages=c,c++ --enable-shared --enable-threads=posix
> --with-local-prefix=/gentoo/prefix64/usr --enable-__cxa_atexit
> --with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.6.3 p1.7,
> pie-0.5.2' --with-gnu-ld --with-gnu-as
> Thread model: posix
> gcc version 4.6.3 (Gentoo 4.6.3 p1.7, pie-0.5.2)
>
>
> The latter output is used now, but to my taste way too lengthy for
> mutt -v output. The compiler output itself already takes almost a full
> terminal window here.
>
>
>
> --
> Fabian Groffen
> Gentoo on a different level
--
David Champion • d...@bikeshed.us
