On 16 Jan 2012, at 15:31, Jonathan Wakely wrote: > On 16 January 2012 13:55, Hans Aberg wrote: >> [I am not on this list, so please cc me.] >> >> On OS X 10.7.2, gcc (GCC) 4.7.0 20120115 from SVN compiles using the >> /usr/bin/gcc -> llvm-gcc-4.2 that is installed by Xcode 4.2.1. >> >> But if one first compiles GCC 4.6.2 using the same LLVM-GCC, then this GCC >> 4.7 will not compile; there is a configure error: >> >> checking for long long... yes >> checking size of long long... configure: error: in >> `/usr/local/src/gcc/gcc/host-x86_64-apple-darwin11.2.0/gcc': >> configure: error: cannot compute sizeof (long long) >> See `config.log' for more details. >> >> The config.log of this directory just indicates a program doing the check >> that will fail (now overwritten by new ./configure && make). > > Do not run ./configure, see http://gcc.gnu.org/wiki/InstallingGCC and > http://gcc.gnu.org/wiki/FAQ#configure and > http://gcc.gnu.org/install/configure.html - you have to try pretty > hard to avoid that tip if you read any installation docs at all.
Too late! Actually, I ended up on http://gcc.gnu.org/svn.html which does not say anything about install. Perhaps add a note. It is a good idea to do it from outside the directory - 'make clean' does not work. > The check in the config.log is what's needed to identify the problem. > The problem might go away if you stop using ./configure, if not then > try asking on the gcc-help list, or submitting it to bugzilla if you > think it's a gcc bug. I'll try that some other time. Hans
