The clang executable size mystery deepens:

The sizes are indeed waaaay big:

7.4M test-files-clang/test*

4.5M test-files-clang/test-stripped*
1.4M test-files-gcc/test*

1.1M test-files-gcc/test-stripped*

Looking at the load info from the stripped versions, it is all in the main text segment:

test-files-clang/load test-files-gcc/load

__TEXT.__text : 3,554,134 833,502
__TEXT.__stubs : 876 672

__TEXT.__stub_helper : 1,476 1,136
__TEXT.__const : 59,040 32,104

__TEXT.__cstring : 24,156 24,900
__TEXT.__dof_HaskellEv : 4,774 4,774

__TEXT.__eh_frame : 22,976 46,664
__DATA.__got : 1,264 880

__DATA.__nl_symbol_ptr : 16 16
__DATA.__la_symbol_ptr : 1,168 896

__DATA.__mod_init_func : 8 8
__DATA.__const : 130,048 79,744

__DATA.__data : 231,848 22,904
__DATA.__common : 45,924 46,092

__DATA.__bss : 856 840
TOTAL SIZE : 4,078,564 1,095,132

But, the compiled sizes are identical:

1.9K test-files-clang/Main.o

1.9K test-files-gcc/Main.o

And, after dumping the link command, and looking up all the libs linked in (identical set in both cases), the clang libs are actually smaller:

13,004,272 ...clang.../lib/ghc-7.8.3/base-4.7.0.1/libHSbase-4.7.0.1.a
792,352 ...clang.../lib/ghc-7.8.3/ghc-prim-0.3.1.0/libHSghc-prim-0.3.1.0.a
1,010,824 ...clang.../lib/ghc-7.8.3/integer-gmp-0.5.1.0/libHSinteger-gmp-0.5.1.0.a

55,816 ...clang.../lib/ghc-7.8.3/rts-1.0/libCffi.a
565,112 ...clang.../lib/ghc-7.8.3/rts-1.0/libHSrts.a

24,378,416 ...gcc.../lib/ghc-7.8.3/base-4.7.0.1/libHSbase-4.7.0.1.a
1,253,176 ...gcc.../lib/ghc-7.8.3/ghc-prim-0.3.1.0/libHSghc-prim-0.3.1.0.a

1,014,280 ...gcc.../lib/ghc-7.8.3/integer-gmp-0.5.1.0/libHSinteger-gmp-0.5.1.0.a
57,984 ...gcc.../lib/ghc-7.8.3/rts-1.0/libCffi.a

556,432 ...gcc.../lib/ghc-7.8.3/rts-1.0/libHSrts.a

So now I'm totally mystified! What is in that 3M of extra text segment?!?!?

- Mark