Ian, The very last thing recognizable as an error in the gcc_build/i686-pc-linux-gnu/libgcc/config.log file is this: configure:3246: checking for suffix of object files configure:3268: /home/E341484/gnu-install/gcc_build/./gcc/xgcc -B/home/E341484/gnu-install/gcc_build/./gcc/ -B/usr/local/i686-pc-linux-gnu/bin/ -B/usr/local/i686-pc-linux-gnu/lib/ -isystem /usr/local/i686-pc-linux-gnu/include -isystem /usr/local/i686-pc-linux-gnu/sys-include -c -g -O2 conftest.c >&5 /home/E341484/gnu-install/gcc_build/./gcc/cc1: error while loading shared libraries: libcloog.so.0: cannot open shared object file: No such file or directory configure:3272: $? = 1 This seems to suggest I'm missing libcloog.so.0. However I have installed this already: ls -l /usr/local/lib/libcloog* lrwxrwxrwx 1 root root 17 Nov 2 07:04 /usr/local/lib/libcloog.so.0 -> libcloog.so.0.0.0 -rwxr-xr-x 1 root root 323388 Nov 2 07:04 /usr/local/lib/libcloog.so.0.0.0 (in addition to .a and .1a and .so as well in the same place). The path to these is specified in the configure command (with --with-cloog=/usr/local ). So shouldn't it be found? In another post from Johnathan Wakely, he sent some links to these web pages: http://gcc.gnu.org/wiki/FAQ#configure_suffix http://advogato.org/person/redi/diary/253.html This suggests the 'cannot compute object file suffix' error is related to not having the prerequisites in place. I have however installed all of them (gmp-4.3.2, mpc-0.9, mpfr-3.1.0 in addition to ppl-0.11.2 and clog-ppl-0.15.11), and their locations are all specified in the configure statement (--with-gmp=/usr/local --with-mpc=/usr/local etc.). The 2nd link suggests using the ./contrib./download_prerequisites script to get the correct prerequisites in the correct places, which I then did (after freshly re-expanding everything from the .tar file and deleting everything from the gcc_build directory). I then ran: ../gcc-4.6.2/configure -enable-languages=c,c++,fortran make but this also failed with the errors described below (suggests I have conflicting versions of gmp: do I need to find and get rid of gmp-3.x.x to get this to work?). gcc -g -fkeep-inline-functions -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -Wold-style-definition -Wc++-compat -fno-common -DHAVE_CONFIG_H -o cc1 c-lang.o c-family/stub-objc.o attribs.o c-errors.o c-decl.o c-typeck.o c-convert.o c-aux-info.o c-objc-common.o c-parser.o tree-mudflap.o c-family/c-common.o c-family/c-cppbuiltin.o c-family/c-dump.o c-family/c-format.o c-family/c-gimplify.o c-family/c-lex.o c-family/c-omp.o c-family/c-opts.o c-family/c-pch.o c-family/c-ppoutput.o c-family/c-pragma.o c-family/c-pretty-print.o c-family/c-semantics.o c-family/c-ada-spec.o i386-c.o \ cc1-checksum.o main.o tree-browser.o libbackend.a ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a ../libcpp/libcpp.a ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a -lppl_c -lppl -lpwl -lgmpxx -L/home/E341484/gnu-install/gcc_build/./gmp/.libs -L/home/E341484/gnu-install/gcc_build/./mpfr/.libs -L/home/E341484/gnu-install/gcc_build/./mpc/src/.libs -lmpc -lmpfr -lgmp -rdynamic -ldl -L../zlib -lz /usr/bin/ld: warning: libgmpxx.so.4, needed by /usr/local/lib/libppl_c.so, may conflict with libgmpxx.so.3 /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../libgmpxx.so: undefined reference to `__gmp_doprnt_mpf' collect2: ld returned 1 exit status Thanks, Wharton -----Original Message----- From: Ian Lance Taylor [mailto:iant@xxxxxxxxxx] Sent: Friday, November 04, 2011 6:44 PM To: Sinkler, Wharton Cc: gcc-help@xxxxxxxxxxx Subject: Re: gcc-4.6.2 build problem related to xgcc not liking '-V' option on i686-pc-linux-gnu "Sinkler, Wharton" <Wharton.Sinkler@xxxxxxx> writes: > I found more detail on the make failure in the file ./i686-pc-linux-gnu/libgcc/config.log, which shows an error occurring at this statement: > > configure:3028: /home/E341484/gnu-install/gcc_build/./gcc/xgcc -B/home/E341484/gnu-install/gcc_build/./gcc/ -B/usr/local/i686-pc-linux-gnu/bin/ -B/usr/local/i686-pc-linux-gnu/lib/ -isystem /usr/local/i686-pc-linux-gnu/include -isystem /usr/local/i686-pc-linux-gnu/sys-include -V >&5 > xgcc: error: unrecognized option '-V' > xgcc: fatal error: no input files > compilation terminated. This is not the problem. This is a result of the configure script testing whether the compiler supports the -V option. You are looking in the right place, but you need to look for the last error in the config.log file. Ian
