http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52038
Bug #: 52038 Summary: [4.7 regression] fortran bootstrap failure: no previous prototype for 'symbol_as' Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassig...@gcc.gnu.org ReportedBy: mi...@it.uu.se Bootstrapping gcc-4.7-20120128 on i686-linux with fortran enabled and --disable-build-poststage1-with-cxx fails in stage 2 due to: /mnt/scratch/objdir47/./prev-gcc/xgcc -B/mnt/scratch/objdir47/./prev-gcc/ -B/mnt/scratch/install47/i686-pc-linux-gnu/bin/ -B/mnt/scratch/install47/i686-pc-linux-gnu/bin/ -B/mnt/scratch/install47/i686-pc-linux-gnu/lib/ -isystem /mnt/scratch/install47/i686-pc-linux-gnu/include -isystem /mnt/scratch/install47/i686-pc-linux-gnu/sys-include -c -DIN_GCC_FRONTEND -g -O2 -gtoggle -DIN_GCC -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -Wold-style-definition -Wc++-compat -DHAVE_CONFIG_H -I. -Ifortran -I/mnt/scratch/gcc-4.7-20120128/gcc -I/mnt/scratch/gcc-4.7-20120128/gcc/fortran -I/mnt/scratch/gcc-4.7-20120128/gcc/../include -I/mnt/scratch/gcc-4.7-20120128/gcc/../libcpp/include -I/home/mikpe/pkgs/linux-x86/gmp-5.0.3/include -I/home/mikpe/pkgs/linux-x86/mpfr-3.1.0/include -I/home/mikpe/pkgs/linux-x86/mpc-0.9/include -I/mnt/scratch/gcc-4.7-20120128/gcc/../libdecnumber -I/mnt/scratch/gcc-4.7-20120128/gcc/../libdecnumber/bid -I../libdecnumber /mnt/scratch/gcc-4.7-20120128/gcc/fortran/resolve.c -o fortran/resolve.o /mnt/scratch/gcc-4.7-20120128/gcc/fortran/resolve.c:1586:1: error: no previous prototype for 'symbol_as' [-Werror=missing-prototypes] cc1: all warnings being treated as errors make[3]: *** [fortran/resolve.o] Error 1 The previous weekly snapshot, 4.7-20120121, bootstrapped fine. Looking at the diff the reason is obvious: a non-static definition of symbol_as() was added to resolve.c, but there's (a) no prototype for it, and (b) no uses either. Disabling symbol_as() with #if 0 / #endif allowed the bootstrap to complete.