[PATCH v3 12/18] convert the Go front end to automatic dependencies

[Tom Tromey]

Tom> I can try a test build using a setting for CC that rejects -c -o.

I did this and the build died pretty early on:

  /home/tromey/Space/Trunk/Git/bin/my-cc -c -DHAVE_CONFIG_H -g -g -I. -I../../gcc/libiberty/../include  -W -Wall -Wwrite-strings -Wc++-compat -Wstrict-prototypes -pedantic  -fpic ../../gcc/libiberty/regex.c -o pic/regex.o; \
else true; fi
no -c -o support
make[3]: *** [regex.o] Error 1
make[3]: Leaving directory `/home/tromey/Space/Trunk/Git/build/libiberty'
make[2]: *** [all-stage1-libiberty] Error 2


In this case the --enable-shared for libiberty was added automatically
because LTO defaults to enabled.  Adding --disable-lto lets it get
further:

/home/tromey/Space/Trunk/Git/bin/my-cc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"zlib\" -DVERSION=\"1.1.4\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DHAVE_STDLIB_H=1 -DHAVE_UNISTD_H=1 -DHAVE_GETPAGESIZE=1 -DHAVE_MMAP=1 -DHAVE_MEMCPY=1 -DHAVE_STRERROR=1 -DHAVE_UNISTD_H=1 -I. -I../../gcc/zlib   -g  -g -c -o libz_a-adler32.o `test -f 'adler32.c' || echo '../../gcc/zlib/'`adler32.c
no -c -o support
make[3]: *** [libz_a-adler32.o] Error 1
make[3]: Leaving directory `/home/tromey/Space/Trunk/Git/build/zlib'
make[2]: *** [all-stage1-zlib] Error 2


And indeed, zlib's configure.ac does not invoke AC_PROG_CC_C_O.

So, maybe this has been broken a long time.

Tom