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I'm trying to compile g++ 4.7.1 from source on Ubuntu 12.04 32 bits. For the moment I've exactly done that : https://askubuntu.com/questions/168947/how-to-upgrade-g-to-4-7-1 Except just before the compilation of g++ 4.7.1 it asks me to "unset LIBRARY_PATH" (so I've done that). So the compilation starts, and after a while I have the following error message : In file included from ../.././gcc/c-lang.c:24:0: ../.././gcc/system.h:499:20: erreur: conflicting types for ‘strsignal’ /usr/include/string.h:566:14: note: previous declaration of ‘strsignal’ was here In file included from ./tm.h:19:0, from ../.././gcc/c-lang.c:26: ./options.h:3738:2: erreur: #error too many masks for ix86_isa_flags In file included from ../.././gcc/input.h:25:0, from ../.././gcc/tree.h:27, from ../.././gcc/c-lang.c:27: ../.././gcc/../libcpp/include/line-map.h:208:38: erreur: ‘CHAR_BIT’ undeclared here (not in a function) ../.././gcc/../libcpp/include/line-map.h:208:3: erreur: bit-field ‘reason’ width not an integer constant ../.././gcc/../libcpp/include/line-map.h:208:3: attention : ‘reason’ is narrower than values of its type [enabled by default] In file included from ../.././gcc/tree.h:32:0, from ../.././gcc/c-lang.c:27: ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if ../.././gcc/hwint.h:17:39: erreur: division par zéro dans #if .

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