http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54423
--- Comment #2 from Nenad Vukicevic <nenad at intrepid dot com> 2012-10-16 17:38:37 UTC --- I verified that I have the latest Xcode (4.5). I verified that I installed the latest development CLI tools (via Xcode and manual download). * I see that 10.8 SDK directory exists under Xcode App - but not under /Developer * cc running is llvm - 4.2.1 * I see that it links with the following command: /Developer/usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/as -arch x86_64 -force_cpusubtype_ALL -o /var/folders/z7/83zx0wdj4cx644rg7p7kgwb80000gn/T//ccDk1do9.o /var/folders/z7/83zx0wdj4cx644rg7p7kgwb80000gn/T//ccDTslhw.s /Developer/usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/collect2 -dynamic -arch x86_64 -macosx_version_min 10.8.2 -weak_reference_mismatches non-weak -o t -lcrt1.10.6.o -L/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/x86_64 -L/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1 -L/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/../../.. /var/folders/z7/83zx0wdj4cx644rg7p7kgwb80000gn/T//ccDk1do9.o -lSystem -lgcc -lSystem Note the "-lcrt1.10.6.0" on the command line. Is linking with crt1.10.6.0 the right fix for Mountain Lion?