gcc cannot find bits/predefs.h on i686

Question

Okay, so, I switched from ubuntu 12.04 64-bit to 32-bit and installed build-essential.

I then compiled and installed GMP-5.0.5, MPFR-3.1.1, MPC-1.0, ISL-0.10 and CLOOG-0.17.0. I checked out a copy of the main gcc trunk and attempted to build it with the following configure line (from a separate directory):

../svnsrc/configure --prefix=/usr/GCC/svn --enable-__cxa_atexit --with-plugin-ld=/usr/bin/ld.gold --enable-threads=posix --enable-werror --enable-build-with-cxx --with-gmp=/usr/GCC/prereq/svn --with-mpfr=/usr/GCC/prereq/svn --with-mpc=/usr/GCC/prereq/svn --with-isl=/usr/GCC/prereq/svn --with-cloog=/usr/GCC/prereq/svn --enable-languages=c,c++

Configure ran fine and so I ran make && make check. This ran fine for a while, but then it failed with the following error:

/home/matt/GCC/svnbuild/./gcc/xgcc -B/home/matt/GCC/svnbuild/./gcc/ -B/usr/GCC/svn/i686-pc-linux-gnu/bin/ -B/usr/GCC/svn/i686-pc-linux-gnu/lib/ -isystem /usr/GCC/svn/i686-pc-linux-gnu/include -isystem /usr/GCC/svn/i686-pc-linux-gnu/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include   -fpic -mlong-double-80 -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -fpic -mlong-double-80 -I. -I. -I../.././gcc -I../../../svnsrc/libgcc -I../../../svnsrc/libgcc/. -I../../../svnsrc/libgcc/../gcc -I../../../svnsrc/libgcc/../include -I../../../svnsrc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../../../svnsrc/libgcc/libgcc2.c -fvisibility=hidden -DHIDE_EXPORTS
In file included from /usr/include/stdio.h:28:0,
                 from ../../../svnsrc/libgcc/../gcc/tsystem.h:88,
                 from ../../../svnsrc/libgcc/libgcc2.c:29:
/usr/include/features.h:324:26: fatal error: bits/predefs.h: No such file or directory
 #include <bits/predefs.h>
                          ^
compilation terminated.
make[3]: *** [_muldi3.o] Error 1
make[3]: Leaving directory `/home/matt/GCC/svnbuild/i686-pc-linux-gnu/libgcc

I looked around, but everything I seemed to find was that this error was caused on x86_64, by not installing gcc-multilib, because Ubuntu and Debian use the mutiarch system, separating the libraries. Okay, fine...but I'm using i686, so why would I need the 64-bit libraries? Any help would be appreciated. Thanks.

Answer 1

Try doing a

sudo apt-get install gcc-multilib

I don't think that installing a 32-bit system changes the architecture of your computer, because your computer will always be a 64-bit machine. Installing the 64-bit version of Ubuntu should only give better multi-core performance. Since your computer is still a 64-bit computer, you probably need a C compiler that will compile on 64-bit machines. Hence the gcc-multilib. I think.

Answer 2

the gcc-multilib trick didn't work out for me. Instead, setting this in the build environment did the trick:

C_INCLUDE_PATH=/usr/include/$(gcc -print-multiarch)