The following command (which works for me with macports gmp,mpfr,and mpc, and a hand-built-from-source libiconv in /usr/local/lib) fails without --disable-libitm.

export LDFLAGS=-L/usr/local/lib && ~/src/gcc/configure --enable-languages=c,c++ --disable-libitm --disable-multilib --disable-bootstrap --prefix=/usr/local/stow/gcc-4.7 --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local && gmake -j8

The failure looks like:


libtool: compile:  /private/tmp/gcc-build/./gcc/xgcc -B/private/tmp/gcc-build/./gcc/ -B/usr/local/stow/gcc-4.7/x86_64-apple-darwin10.8.0/bin/ -B/usr/local/stow/gcc-4.7/x86_64-apple-darwin10.8.0/lib/ -isystem /usr/local/stow/gcc-4.7/x86_64-apple-darwin10.8.0/include -isystem /usr/local/stow/gcc-4.7/x86_64-apple-darwin10.8.0/sys-include -DHAVE_CONFIG_H -I. -I/Users/dave/src/gcc/libitm -I/Users/dave/src/gcc/libitm/config/x86 -I/Users/dave/src/gcc/libitm/config/posix -I/Users/dave/src/gcc/libitm/config/generic -I/Users/dave/src/gcc/libitm -Wall -pthread -Werror -g -O2 -MT sjlj.lo -MD -MP -MF .deps/sjlj.Tpo -c /Users/dave/src/gcc/libitm/config/x86/sjlj.S  -fno-common -DPIC -o .libs/sjlj.o
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:28:Unknown pseudo-op: .type
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:28:Rest of line ignored. 1st junk character valued 95 (_).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:31:Unknown pseudo-op: .cfi_startproc
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:36:Unknown pseudo-op: .cfi_def_cfa_offset
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:36:Rest of line ignored. 1st junk character valued 56 (8).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:48:Unknown pseudo-op: .cfi_def_cfa_offset
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:48:Rest of line ignored. 1st junk character valued 56 (8).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:65:Unknown pseudo-op: .cfi_endproc
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:66:Unknown pseudo-op: .size
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:66:Rest of line ignored. 1st junk character valued 95 (_).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:70:Unknown pseudo-op: .type
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:70:Rest of line ignored. 1st junk character valued 71 (G).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:71:Unknown pseudo-op: .hidden
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:71:Rest of line ignored. 1st junk character valued 71 (G).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:74:Unknown pseudo-op: .cfi_startproc
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:85:Unknown pseudo-op: .cfi_def_cfa
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:85:Rest of line ignored. 1st junk character valued 37 (%).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:86:Unknown pseudo-op: .cfi_register
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:86:Rest of line ignored. 1st junk character valued 37 (%).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:102:Unknown pseudo-op: .cfi_endproc
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:103:Unknown pseudo-op: .size
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:103:Rest of line ignored. 1st junk character valued 71 (G).
/Users/dave/src/gcc/libitm/config/x86/sjlj.S:105:unknown section type: @progbits
gmake[4]: *** [sjlj.lo] Error 1
gmake[4]: Leaving directory `/private/tmp/gcc-build/x86_64-apple-darwin10.8.0/libitm'
gmake[3]: *** [all-recursive] Error 1
gmake[3]: Leaving directory `/private/tmp/gcc-build/x86_64-apple-darwin10.8.0/libitm'
gmake[2]: *** [all] Error 2
gmake[2]: Leaving directory `/private/tmp/gcc-build/x86_64-apple-darwin10.8.0/libitm'
gmake[1]: *** [all-target-libitm] Error 2
gmake[1]: Leaving directory `/private/tmp/gcc-build'
gmake: *** [all] Error 2

Compilation exited abnormally with code 2 at Wed Nov  9 06:41:48