This is to report a successful build of GCC 4.4.3 and GCC 4.5.0 (156177) on my Macbook6,1.
./config.guess: i386-apple-darwin10.2.0 gcc -v: For GCC 4.4.3: Using built-in specs. Target: x86_64-apple-darwin10.2.0 Configured with: ../gcc-4.4.3/configure --prefix=/Users/olexa/Documents/MyApps/Commands/GCC/MacOSX-stable --with-pkgversion='GNU GCC 4.4.3 Codename Hallelujah GCC built Jan 21, 2009 with GMP 4.3.2, MPFR 2.4.2, MPC 0.8.1 and Libelf 0.8.13, bootstrap by GNU GCC 4.4.3 Codename Bootstrapper GCC' --with-libelf=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/libelf --enable-lto --with-mpc=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/mpc --with-mpfr=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/mpfr --with-gmp=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/gmp --enable-shared --enable-static --target=x86_64-apple-darwin10.2.0 --build=x86_64-apple-darwin10.2.0 --host=x86_64-apple-darwin10.2.0 --enable-threads --enable-languages=c,c++,fortran,objc,obj-c++ --enable-werror --enable-checking --enable-stage1-checking --disable-nls --disable-build-with-cxx --enable-gather-detailed-mem-stats --enable-decimal-float --with-tune=core2 CC='gcc -O3' CPPFLAGS=-O3 Thread model: posix gcc version 4.4.3 (GNU GCC 4.4.3 Codename Hallelujah GCC built Jan 21, 2009 with GMP 4.3.2, MPFR 2.4.2, MPC 0.8.1 and Libelf 0.8.13, bootstrap by GNU GCC 4.4.3 Codename Bootstrapper GCC) For GCC 4.5.0 revision 156177: Using built-in specs. COLLECT_GCC=./gcc COLLECT_LTO_WRAPPER=/Users/olexa/Documents/MyApps/Commands/GCC/MacOSX-instable/libexec/gcc/x86_64-apple-darwin10.2.0/4.5.0/lto-wrapper Target: x86_64-apple-darwin10.2.0 Configured with: ../gcc-svn-156177/configure --prefix=/Users/olexa/Documents/MyApps/Commands/GCC/MacOSX-instable --with-pkgversion='GNU GCC (4.5.0 - SVN revision 156177) Codename Mjolnir built Jan 22, 2009 with GMP 4.3.2, MPFR 2.4.2, MPC 0.8.1 and Libelf 0.8.13, bootstrap by GNU GCC 4.4.3 Codename Hallelujah GCC' --with-libelf=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/libelf --disable-lto --with-mpc=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/mpc --with-mpfr=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/mpfr --with-gmp=/Users/olexa/Documents/MyApps/Commands/GCC/Dependencies/gmp --enable-shared --enable-static --target=x86_64-apple-darwin10.2.0 --build=x86_64-apple-darwin10.2.0 --host=x86_64-apple-darwin10.2.0 --enable-threads --enable-languages=c,c++,fortran,objc,obj-c++ --enable-werror --enable-checking --enable-stage1-checking --disable-nls --disable-build-with-cxx --enable-gather-detailed-mem-stats --enable-decimal-float --with-tune=core2 Thread model: posix gcc version 4.5.0 20100122 (experimental) (GNU GCC (4.5.0 - SVN revision 156177) Codename Mjolnir built Jan 22, 2009 with GMP 4.3.2, MPFR 2.4.2, MPC 0.8.1 and Libelf 0.8.13, bootstrap by GNU GCC 4.4.3 Codename Hallelujah GCC) Other relevant information: uname -a: Darwin *****-**********-MacBook.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 System Specs: MacBook6,1 (Late 2009) Standard Configuration Mac OS X 10.6.2 Intel Core 2 Duo 2.26 GHz 2GB DDR3 1066 MHz RAM Xcode 3.2.1 (GCC 4.2.1 (1), Apple Inc.) Request for update to system-specific installation instructions: I am on Mac OS X Snow Leopard. There has been some noise around the forums that GCC fails for various reasons. It turns out that despite having all the requirements to run 64-bit systems, including a 64-bit processor (an Intel Core 2 Duo), no Macs boot the 64-bit kernel by default and only 4 (These being Mac Pros, Xserves, Macbook Pros and iMacs) are allowed to boot it at all, leaving that the system kernel runs 32-bit, but almost every application is 64-bit. Also, the command uname returns i386 despite the Core 2 Duo being more of a i686 or x86_64, a 64-bit processor. It seems therefore that config.guess confuses itself in bitness, picking the 32-bit version called i386 rather than the correct choice, x86_64. So the recommendation is to add an entry under Build Stats saying that 4.4.3 under x86_64-apple-darwin10.2.0 is successful, and to add to the system-specific installation notes to add these options to the configure: --host=x86_64-apple-darwin10 --target=x86_64-apple-darwin10 --host=x86_64-apple-darwin10 This essentially forces configure to choose the 64-bit flavour. I selected core2 because I am not compiling executables for any other processors - Macs have all switched to either Core 2 Duo, Core 2 Quad, or, in high-ends, to i5 and i7 with Intel Xeon or Nehalem architecture. I experienced problems with --enable-lto, bizarrely, so I had to turn it off, with --disable-lto. This goes both for 4.4.3 and 4.5.0.
