H.J.,
The clang compilers exhibit the same behavior on these test cases.
Undefined symbols for architecture x86_64:
"_foo", referenced from:
_main in visibility-23-e1e564.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
however if I also pass "-Wl,-undefined -Wl,dynamic_lookup" to the
linker, both test
compile and run.
FYI, the assembly from...
/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/xgcc
-B/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/
/sw/src/fink.build/gcc50-5.0.0-1000/gcc-5-20150206/gcc/testsuite/gcc.dg/visibility-23.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -fPIC -S -m32 -o
visibility-23.s
contains...
.text
.globl _main
_main:
LFB0:
pushl %ebp
LCFI0:
movl %esp, %ebp
LCFI1:
subl $8, %esp
call ___x86.get_pc_thunk.ax
L1$pb:
leal L_foo$non_lazy_ptr-L1$pb(%eax), %eax
movl (%eax), %eax
testl %eax, %eax
je L2
call _foo
L2:
movl $0, %eax
leave
LCFI2:
ret
LFE0:
.weak_reference _foo
.section __TEXT,__textcoal_nt,coalesced,pure_instructions
.weak_definition ___x86.get_pc_thunk.ax
.private_extern ___x86.get_pc_thunk.ax
___x86.get_pc_thunk.ax:
LFB1:
movl (%esp), %eax
ret
LFE1:
.section
__TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support
EH_frame1:
.set L$set$0,LECIE1-LSCIE1
.long L$set$0
LSCIE1:
.long 0
.byte 0x1
.ascii "zR\0"
.byte 0x1
.byte 0x7c
.byte 0x8
.byte 0x1
.byte 0x10
.byte 0xc
.byte 0x5
.byte 0x4
.byte 0x88
.byte 0x1
.align 2
LECIE1:
LSFDE1:
.set L$set$1,LEFDE1-LASFDE1
.long L$set$1
LASFDE1:
.long LASFDE1-EH_frame1
.long LFB0-.
.set L$set$2,LFE0-LFB0
.long L$set$2
.byte 0
.byte 0x4
.set L$set$3,LCFI0-LFB0
.long L$set$3
.byte 0xe
.byte 0x8
.byte 0x84
.byte 0x2
.byte 0x4
.set L$set$4,LCFI1-LCFI0
.long L$set$4
.byte 0xd
.byte 0x4
.byte 0x4
.set L$set$5,LCFI2-LCFI1
.long L$set$5
.byte 0xc4
.byte 0xc
.byte 0x5
.byte 0x4
.align 2
LEFDE1:
LSFDE3:
.set L$set$6,LEFDE3-LASFDE3
.long L$set$6
LASFDE3:
.long LASFDE3-EH_frame1
.long LFB1-.
.set L$set$7,LFE1-LFB1
.long L$set$7
.byte 0
.align 2
LEFDE3:
.section __IMPORT,__pointers,non_lazy_symbol_pointers
.weak_reference _foo
L_foo$non_lazy_ptr:
.indirect_symbol _foo
.long 0
.subsections_via_symbols
On Fri, Feb 6, 2015 at 4:41 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
> On Fri, Feb 6, 2015 at 1:31 PM, Jack Howarth <howarth.at....@gmail.com> wrote:
>> H.J.,
>> On x86_64-apple-darwin14, your patch applied to r220481 results in...
>>
>> FAIL: gcc.dg/visibility-22.c (test for excess errors)
>> FAIL: gcc.dg/visibility-23.c scan-hidden private_extern[ \t_]*_?foo
>>
>> with...
>>
>> Executing on host:
>> /sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/xgcc
>> -B/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/
>> /sw/src/fink.build/gcc50-5.0.0-1000/gcc-5-20150206/gcc/testsuite/gcc.dg/visibility-22.c
>> -fno-diagnostics-show-caret -fdiagnostics-color=never -fPIC -lm
>> -m32 -o ./visibility-22.exe (timeout = 300)
>> spawn -ignore SIGHUP
>> /sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/xgcc
>> -B/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/
>> /sw/src/fink.build/gcc50-5.0.0-1000/gcc-5-20150206/gcc/testsuite/gcc.dg/visibility-22.c
>> -fno-diagnostics-show-caret -fdiagnostics-color=never -fPIC -lm -m32
>> -o ./visibility-22.exe^M
>> Undefined symbols for architecture i386:^M
>> "_foo", referenced from:^M
>> _main in ccMD1qjz.o^M
>> _main in ccMD1qjz.o^M
>> ld: symbol(s) not found for architecture i386^M
>> collect2: error: ld returned 1 exit status^M
>> compiler exited with status 1
>> output is:
>> Undefined symbols for architecture i386:^M
>> "_foo", referenced from:^M
>> _main in ccMD1qjz.o^M
>> _main in ccMD1qjz.o^M
>> ld: symbol(s) not found for architecture i386^M
>> collect2: error: ld returned 1 exit status^M
>>
>> FAIL: gcc.dg/visibility-22.c (test for excess errors)
>>
>> Executing on host:
>> /sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/xgcc
>> -B/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/
>> /sw/src/fink.build/gcc50-5.0.0-1000/gcc-5-20150206/gcc/testsuite/gcc.dg/visibility-23.c
>> -fno-diagnostics-show-caret -fdiagnostics-color=never -fPIC -S
>> -m32 -o visibility-23.s (timeout = 300)
>> spawn -ignore SIGHUP
>> /sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/xgcc
>> -B/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/gcc/
>> /sw/src/fink.build/gcc50-5.0.0-1000/gcc-5-20150206/gcc/testsuite/gcc.dg/visibility-23.c
>> -fno-diagnostics-show-caret -fdiagnostics-color=never -fPIC -S -m32 -o
>> visibility-23.s^M
>> PASS: gcc.dg/visibility-23.c (test for excess errors)
>> FAIL: gcc.dg/visibility-23.c scan-hidden private_extern[ \t_]*_?foo
>>
>
> Does Darwin support undefined hidden weak symbol?
> Can you compile and gcc/testsuite/gcc.dg/visibility-22.c
> with clang on Darwin?
>
> --
> H.J.
