[Bug bootstrap/36481] gcc fails to build on Solaris x86 - it forgets the locations of libmpfr

[gbarnt at student dot dtu dot dk]

------- Comment #5 from gbarnt at student dot dtu dot dk  2009-03-23 17:23 -------
Sadly my skills with bugzilla's haven't improved. I meant to have the following
accompany the patch above:

This issue is also present on an x86_64 red hat linux in gcc-4.3.3. 

Usage of --with-gmp and --with-mpfr does not add the path to the run-time
dependencies (see ld's -rpath flag). 

Configured with --with-gmp=$HOME/softInstall_blades/
--with-mpfr=$HOME/softInstall_blades

my x86_64-unknown-linux-gnu/libgcc/config.log (home folder replaced by ~):
~/software/gcc_2build/./gcc/cc1: error while loading shared libraries:
libmpfr.so.1: cannot open shared object file: No such file or direc
tory

ldd gcc/cc1 yields:
        libmpfr.so.1 => not found
        libgmp.so.3 => /usr/lib64/libgmp.so.3 (0x0000003296200000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003365a00000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003365600000)

Notice that it wrongly located the libgmp in /usr/lib64, when I explicitly
asked for it to use the gmp in subdir of my home folder.

I do not have root access to this machine (university) so most (read: all) our
software is installed in non-standard paths - else I would just have
upgraded/installed gmp/mpfr via yum (red hat's package manager) and called it a
day.

Manually adding LDFLAGS="-Wl,-rpath,[dir]" does not work (it still found the
wrong dirs). The "crle" approach is not possible (it is not a sun/solaris
machine).

Looking at configure.ac (gcc-root folder - line: 1191) the variables set by
--with-gmp only adds "-L". Manually appending "-Wl,-rpath,[dir variable]" to
the lib-part worked for me, though "-Wl,-R,[dir variable]" is probably more
portable (since gnu ld translates -R [dir] into -rpath [dir] and solaris uses
-R [dir]). I have not tested if this solution allows [dir variable] to contain
spaces.

For other users suffering this: modification of configure.ac requires autoconf
to update the "configure" script.

~Niels


-- 

gbarnt at student dot dtu dot dk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gbarnt at student dot dtu
                   |                            |dot dk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36481