[Bug other/45760] New: GCC build fails: can't find MPC

[Bug other/45760] New: GCC build fails: can't find MPC

[avi at unix dot sh]

I believe this is a bug in GCC 4.5.1 build system related to the introduction
of MPC.

I'm compiling GCC 4.5.1 and all its dependencies in my home directory and
installing all (make install) at $HOME/OpenFOAM/ROOT

At some GCC build stage it fails with this messages:

---------------------------------------
checking for powerpc64-unknown-linux-gnu-strip... strip
checking whether ln -s works... yes
checking for powerpc64-unknown-linux-gnu-gcc...
/bgpusr3/avibrz/OpenFOAM/gcc-build/./gcc/xgcc
-B/bgpusr3/avibrz/OpenFOAM/gcc-build/./gcc/
-B/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/bin/
-B/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/lib/ -isystem
/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/include -isystem
/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/sys-include
checking for suffix of object files... configure: error: in
`/bgpusr3/avibrz/OpenFOAM/gcc-build/powerpc64-unknown-linux-gnu/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
make[2]: *** [configure-stage1-target-libgcc] Error 1
make[2]: Leaving directory `/bgpusr3/avibrz/OpenFOAM/gcc-build'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/bgpusr3/avibrz/OpenFOAM/gcc-build'
make: *** [all] Error 2
---------------------------------------

Side note: /bgpusr3/avibrz == $HOME
Having a look at
/bgpusr3/avibrz/OpenFOAM/gcc-build/powerpc64-unknown-linux-gnu/libgcc/config.log
I find this:

---------------------------------------
configure:3211: checking for suffix of object files
configure:3233: /bgpusr3/avibrz/OpenFOAM/gcc-build/./gcc/xgcc
-B/bgpusr3/avibrz/OpenFOAM/gcc-build/./gcc/
-B/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/bin/
-B/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/lib/ -isystem
/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/include -isystem
/bgpusr3/avibrz/OpenFOAM/ROOT/powerpc64-unknown-linux-gnu/sys-include    -c -g
-O2  conftest.c >&5
/bgpusr3/avibrz/OpenFOAM/gcc-build/./gcc/cc1: error while loading shared
libraries: libmpc.so.2: cannot open shared object file: No such file or
directory
configure:3237: $? = 1
---------------------------------------

But libmpc.so.2 is there. I even took care of creating artificial symbolic
links to satisfy this bizarre 'powerpc64-unknown-linux-gnu' under ROOT.

This is how I'm configuring GCC as I took care of passing correct directories
for MPC installation:

---------------------------------------
gcc-build$ ../gcc-4.5.1/configure --prefix=$HOME/OpenFOAM/ROOT
--with-stage1-ldflags="-L$HOME/OpenFOAM/ROOT/lib"
--with-gmp="$HOME/OpenFOAM/ROOT" --with-mpfr="$HOME/OpenFOAM/ROOT"
--with-ppl="$HOME/OpenFOAM/ROOT" --with-mpc="$HOME/OpenFOAM/ROOT"
--enable-languages=c++,fortran
---------------------------------------

Any tip ?


-- 
           Summary: GCC build fails: can't find MPC
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: avi at unix dot sh
 GCC build triplet: powerpc64-linux
  GCC host triplet: powerpc64-linux
GCC target triplet: powerpc64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug other/45760] GCC build fails: can't find MPC

[redi at gcc dot gnu dot org]

------- Comment #1 from redi at gcc dot gnu dot org  2010-09-23 13:58 -------
set LD_LIBRARY_PATH so the dynamic loader can find libmpc.so.2


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug other/45760] GCC build fails: can't find MPC

[avi at unix dot sh]

------- Comment #2 from avi at unix dot sh  2010-09-23 14:03 -------
I was able to make it pass that stage explicitly setting the library path like
this:

gcc-build$ LD_LIBRARY_PATH=$HOME/OpenFOAM/lib make

I found this was not related to MPC since I moved to 4.4.4 (pre-MPC version of
GCC) and I got same problem with MPFR (another GCC dependency).

Since I'm already using --with-mpfr=DIRNAME, I was expecting that the library
path was being set automatically.

So I still consider this a weak point on the build system that could be
automatically managed.


-- 

avi at unix dot sh changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|blocker                     |normal


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug other/45760] GCC build fails: can't find MPC

[redi at gcc dot gnu dot org]

------- Comment #3 from redi at gcc dot gnu dot org  2010-09-23 14:08 -------
GCC doesn't set runpaths in executables, this is intentional:
http://gcc.gnu.org/faq.html#rpath

If you don't want those support libs installed for their own sake and are only
installing them for GCC to use, then a simpler way to build it is to put the
gmp, mpfr and mpc sources under gcc-4.5.1 (renamed from gmp-x.y.z to just gmp,
and similarly for mpfr and mpc) and then just configure gcc without any
--with-{gmp,mpfr,mpc} options.  That way gcc will build with those sources and
doesn't need to find the shared libs.

Or you can build the libs with --disable-shared so that gcc will have to link
statically to libgmp.a, which also avoids needing to find the shared libs.

Or you can just make sure the shared lib can be found, using LD_LIBRARY_PATH or
LD_RUN_PATH or ldconfig.

(In reply to comment #0)
> But libmpc.so.2 is there. I even took care of creating artificial symbolic
> links to satisfy this bizarre 'powerpc64-unknown-linux-gnu' under ROOT.

Don't do that.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug bootstrap/45760] GCC build fails: can't find MPC

[redi at gcc dot gnu dot org]

------- Comment #4 from redi at gcc dot gnu dot org  2010-09-23 14:14 -------
this should be documented, either under the --with-gmp configuration docs or in
the faq


-- 

redi at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |redi at gcc dot gnu dot org
                   |dot org                     |
             Status|UNCONFIRMED                 |ASSIGNED
          Component|other                       |bootstrap
     Ever Confirmed|0                           |1
           Keywords|                            |documentation
   Last reconfirmed|0000-00-00 00:00:00         |2010-09-23 14:14:55
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug bootstrap/45760] GCC build fails: can't find MPC

[avi at unix dot sh]

------- Comment #5 from avi at unix dot sh  2010-09-23 14:46 -------
Jonathan, your comment #3 was very helpful. I have a very bizarre situation
dealing with cross compilers and entire platforms that must run in my home
directory.

Maybe the best and easier thing for my case is to statically link GCC to its
dependencies.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug bootstrap/45760] GCC build fails: can't find MPC

[avi at unix dot sh]

------- Comment #6 from avi at unix dot sh  2010-09-23 14:47 -------
Now I have a better understanding of GCC build system.


-- 

avi at unix dot sh changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug bootstrap/45760] GCC build fails: can't find MPC

[redi at gcc dot gnu dot org]

------- Comment #8 from redi at gcc dot gnu dot org  2010-09-23 15:28 -------
... and assigning to myself again


-- 

redi at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |ASSIGNED
   Last reconfirmed|2010-09-23 14:14:55         |2010-09-23 15:28:27
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug bootstrap/45760] GCC build fails: can't find MPC

[redi at gcc dot gnu dot org]

------- Comment #7 from redi at gcc dot gnu dot org  2010-09-23 15:28 -------
I'm going to add something to the docs, so I'll keep this PR open until I do
that, so reopening ...


-- 

redi at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

[Bug bootstrap/45760] GCC build fails: can't find MPC

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45760

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-09-30 18:39:44 UTC ---
fixed by http://gcc.gnu.org/ml/gcc-patches/2010-09/msg02135.html

the online docs should update overnight