On Thu, 14 Jun 2018 at 07:53, <stimits@xxxxxxxxxxx> wrote: > > 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/". Why did you do that? The point of putting the sources inside the gcc source tree is that you don't need to do that, it happens automatically. > 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 No no no. You should read https://gcc.gnu.org/wiki/InstallingGCC Stop running ./configure inside the source tree (use a separate build directory). You are giving the location of the source directories with --with-mpfr etc. but that should be the location of the installed files, not the sources. But you should simply stop using --with-mpfr and --with-gmp etc. because the sources are in the gcc source dir already (and you can completely remove the directories "/usr/local/mpfr-2.4.2/", "/usr/local/gmp-4.3.2/", "/usr/local/mpc-0.8.1/", and "/usr/local/isl-0.15/" because you don't need them). > 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? You're using it wrong. You will have messed up the GCC source tree now, so start again from the beginning. Remove /usr/local/src/gcc-x86_64/gcc_6_4_0 completely and extract the GCC sources again, then run contrib/download_prerequisites again, then **in a different directory** run: /usr/local/src/gcc-x86_64/gcc_6_4_0/configure --prefix=/usr/local/gcc_6-4-0 make -j4 Then as root run "make install" (you do not need to do the rest of the build as root).
