configure for gcc 6.4.0 build on Fedora 27

[U.Mutlu]

Hi,
FYI: this is my configure command:

../gcc_trunk/configure -v \
--build=x86_64-linux-gnu \
--host=x86_64-linux-gnu \
--target=x86_64-linux-gnu \
--disable-multilib \
--enable-checking=release \
--enable-languages=c,c++ \
--enable-lto \
--prefix=/usr/local/gcc-latest \
--program-suffix=-latest

This way the compilers will be named "gcc-latest" and "g++-latest"
You can change this to your 6.4.0 version.



U.Mutlu wrote on 06/14/2018 09:41 AM:
> stimits@comcast.net wrote on 06/14/2018 08:53 AM:
>> Hi,
>>
>> I downloaded the subversion tag for gcc 6.4.0. Within this I used the
>> "contrib/download_prerequisites" script, and thus there now exists
>> subdirectories to the gcc source of:
>>   mpfr-2.4.2
>> gmp-4.3.2
>> mpc-0.8.1
>> isl-0.15
>>
>> I also built and installed these in "/usr/local/mpfr-2.4.2/",
>> "/usr/local/gmp-4.3.2/", "/usr/local/mpc-0.8.1/", and "/usr/local/isl-0.15/".
>>
>> If I use "./configure" for gcc in any way it fails claiming incorrect
>> versions shortly after declaring they are correct. For example, directly
>> from the download_prerequisites content:
>> ./configure --prefix=/usr/local/gcc_6-4-0
>> --with-mpfr=/usr/local/src/gcc-x86_64/gcc_6_4_0/mpfr-2.4.2/
>> --with-gmp=/usr/local/src/gcc-x86_64/gcc_6_4_0/gmp-4.3.2
>> --with-mpc=/usr/local/src/gcc-x86_64/gcc_6_4_0/mpc-0.8.1
>> --with-isl=/usr/local/src/gcc-x86_64/gcc_6_4_0/isl-0.15
>>
>> It also fails if I configure for the "/usr/local/" installs:
>> ./gcc_6_4_0/configure --prefix=/usr/local/gcc_6-4-0
>> --with-mpfr=/usr/local/mpfr-2.4.2/ --with-gmp=/usr/local/gmp-4.3.2
>> --with-mpc=/usr/local/mpc-0.8.1 --with-isl=/usr/local/isl-0.15
>>
>> In all cases the log shows the header files were correct, and that the
>> libraries exist, but that for some reason (I suspect a bug) the versions are
>> not accepted:
>> checking for the correct version of gmp.h... yeschecking for the correct
>> version of mpfr.h... yeschecking for the correct version of mpc.h...
>> yeschecking for the correct version of the gmp/mpfr/mpc libraries...
>> noconfigure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC
>> 0.8.0+.Try the --with-gmp, --with-mpfr and/or --with-mpc options to
>> specifytheir locations.  Source code for these libraries can be found at
>> I have tried with the separate objdir as well as in the source tree. Is
>> there a bug preventing the correct versions from being detected? Is there
>> something missing in the documentation needed as a workaround when using the
>> "download_prerequisites" script?
>>
>> Thanks!
>>
>
> Just leave the downloaded directories in the repository directory.
> Then, from a new directory outside the repository start the configure...
> Ie. something like ../my_repo/configure ...