>The error that caused configure to fail is the "cannot compute suffix >of object files" >You didn't read http://gcc.gnu.org/wiki/FAQ#configure_suffix carefully >- that FAQ answer tells you which config.log to look in, and tells you >the most common cause of the error I read it again. I want to do step by step to understand what is going on. I went to the mentioned folder and opened the config.log. The error is: Configured with: ../gcc-4.6.0/configure --prefix=/usr Thread model: posix gcc version 4.6.0 (GCC) configure:3039: $? = 0 configure:3028: /opt/gcc4.6build/./gcc/xgcc -B/opt/gcc4.6build/./gcc/ -B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include -V >&5 xgcc: error: unrecognized option '-V' xgcc: fatal error: no input files compilation terminated. configure:3039: $? = 1 configure:3028: /opt/gcc4.6build/./gcc/xgcc -B/opt/gcc4.6build/./gcc/ -B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include -qversion >&5 xgcc: error: unrecognized option '-qversion' xgcc: fatal error: no input files compilation terminated. configure:3039: $? = 1 configure:3055: /opt/gcc4.6build/./gcc/xgcc -B/opt/gcc4.6build/./gcc/ -B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include -o conftest -g -O2 conftest.c >&5 /opt/gcc4.6build/./gcc/cc1: error while loading shared libraries: libmpc.so.2: cannot open shared object file: No such file or directory configure:3058: $? = 1 configure:3246: checking for suffix of object files configure:3268: /opt/gcc4.6build/./gcc/xgcc -B/opt/gcc4.6build/./gcc/ -B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include -c -g -O2 conftest.c >&5 /opt/gcc4.6build/./gcc/cc1: error while loading shared libraries: libmpc.so.2: cannot open shared object file: No such file or directory configure:3272: $? = 1 It complains about libmpc.so.2 however I have this file since I installed MPC from source: root@pc:/opt/gcc4.6build# find /usr/ -name "*libmpc*" /usr/share/doc/libmpcdec6 /usr/lib/libmpcdec.so.6 /usr/lib/libmpcdec.so.6.1.0 /usr/local/lib/libmpc.so.2.0.0 /usr/local/lib/libmpc.a /usr/local/lib/libmpc.so /usr/local/lib/libmpc.la /usr/local/lib/libmpc.so.2 root@pc:/opt/gcc4.6build# ls -l /usr/local/lib/libmpc.* -rw-r--r-- 1 root root 147256 2011-03-31 12:37 /usr/local/lib/libmpc.a -rwxr-xr-x 1 root root 946 2011-03-31 12:37 /usr/local/lib/libmpc.la lrwxrwxrwx 1 root root 15 2011-03-31 12:37 /usr/local/lib/libmpc.so -> libmpc.so.2.0.0 lrwxrwxrwx 1 root root 15 2011-03-31 12:37 /usr/local/lib/libmpc.so.2 -> libmpc.so.2.0.0 -rwxr-xr-x 1 root root 89558 2011-03-31 12:37 /usr/local/lib/libmpc.so.2.0.0 As you can see in the config.log, I configured the gcc to install in /usr. What should I do in order to tell gcc where is libmpc.so.2 ? regards, // Naderan *Mahmood; ----- Original Message ---- From: Jonathan Wakely <jwakely.gcc@xxxxxxxxx> To: Mahmood Naderan <nt_mahmood@xxxxxxxxx> Cc: gcc <gcc-help@xxxxxxxxxxx> Sent: Thu, March 31, 2011 5:50:59 PM Subject: Re: fatal error: ppl_c.h: No such file or directory On 31 March 2011 13:12, Mahmood Naderan wrote: >>You don't need it, PPL is optional so it's not a problem if you don't have it >>It will download and configure everything for you. > > I will prefer to skip that library if it is optional. > >>See http://gcc.gnu.org/wiki/FAQ#configure_suffix for the actual failure > > I saw that but didn't find how to disable cuh libraries. is it --without-ppl ?? I think you have misunderstood. To skip PPL you do not need to do anything. If you don't have it then it will be skipped. The configure command did not fail because it can't find PPL. There are lots of "errors" in config.log but usually don't matter. That's how configure works, it tries things and sees if it gets an error. So forget about PPL. The error that caused configure to fail is the "cannot compute suffix of object files" You didn't read http://gcc.gnu.org/wiki/FAQ#configure_suffix carefully - that FAQ answer tells you which config.log to look in, and tells you the most common cause of the error. But if you use my config-gcc.mk then you won't get that error, and it will skip PPL, and it will just work. If you're not going to read the documentation properly, please just use that makefile and save a lot of wasted time.
