And after the make, do this:
Make this new compiler the default for this user
by appending these lines to this user's ~/.bashrc :
export PATH=/usr/local/gcc-latest/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/gcc-latest/lib64:$LD_LIBRARY_PATH
Then start a fresh bash shell (or logout from bash and re-login),
so that the above settings will take effect.
You can verify with "echo $PATH" --> the new ccompiler's dir
should come as first.
...and try the new compilers "g++-latest", "gcc-latest",
or whatever names you chose for them.
U.Mutlu wrote on 06/14/2018 09:51 AM:
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@xxxxxxxxxxx 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 ...
