Re: global_symbol_pipe not picking up an initialized global variable with msvc

[Peter Rosin]

Den 2009-08-15 21:41 skrev Peter Rosin:
> However, to be 100% certain and eliminate any doubt you can - if you
> wish - configure with NM=nm (instead of dumpbin -symbols) and see if
> that makes any difference.

I tried to reproduce (but failed, so I think the symbol pipe is
definitely out of the loop):

$ cat main.c
#define UTL_EXPORT __declspec(dllimport)

extern UTL_EXPORT int   opterr;
extern UTL_EXPORT int   optind;
extern UTL_EXPORT int   optopt;
extern UTL_EXPORT int   optreset;
extern UTL_EXPORT char  *optarg;

int main(void)
{
        optreset = 1;
        optarg = 0;
        return opterr + optind + optopt;
}

$ cat getopt.c
#if 1
#define UTL_EXPORT __declspec(dllexport)
#else
/* dllexport not needed, so the below works as well */
#define UTL_EXPORT
#endif

extern UTL_EXPORT int   opterr;
extern UTL_EXPORT int   optind;
extern UTL_EXPORT int   optopt;
extern UTL_EXPORT int   optreset;
extern UTL_EXPORT char  *optarg;

int     opterr = 1;
int     optind = 1;
int     optopt = '?';
int     optreset;
char    *optarg;

$ ./libtool --tag=CC --mode=compile cl -c main.c -o main.lo
libtool: compile:  cl -c -TC main.c  -DDLL_EXPORT -DPIC
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

main.c
libtool: compile: mv -f "main.obj" ".libs/main.obj"

$ ./libtool --tag=CC --mode=compile cl -c getopt.c -o getopt.lo
libtool: compile:  cl -c -TC getopt.c  -DDLL_EXPORT -DPIC
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

getopt.c
libtool: compile: mv -f "getopt.obj" ".libs/getopt.obj"

$ ./libtool --tag=CC --mode=link cl -no-undefined -rpath /nowhere -o 
libgetopt.la getopt.lo
libtool: link: dumpbin -symbols  .libs/getopt.obj   | gawk '     {last_section=section; section=$ 3};     /Section length .*#relocs.*(pick any)/{hide[last_section]=1};     $ 0!~/External *\|/{next};     / 0+ UNDEF /{next}; / UNDEF \([^|]\)*()/{next};     {if(hide[section]) next};     {f=0}; $ 
0~/\(\).*\|/{f=1}; {printf f ? "T " : "D "};     {split($ 0, a, /\||\r/); split(a[2], s)};     s[1]~/address@hidden/{print s[1], s[1]; next};     s[1]~prfx {split(s[1],t,"@"); print t[1], substr(t[1],length(prfx))}     ' prfx=^_ | /bin/sed -e '/^[BCDGRS][ ]/s/.*[ ]\([^ ]*\)/\1,DATA/' | /bin/sed -e '/^[AITW][ 
]/s/.*[ ]//' | sort | uniq > .libs/getopt.exp
libtool: link: if test "x`/bin/sed 1q .libs/getopt.exp`" = xEXPORTS; then sed -n -e 
s/\\\(.*\\\)/-link\ -EXPORT:\\\1/ -e 1\!p < .libs/getopt.exp > .libs/getopt-0.dll.ld; else sed 
-e s/\\\(.*\\\)/-link\ -EXPORT:\\\1/ < .libs/getopt.exp > .libs/getopt-0.dll.ld; fi
libtool: link:  lt_save_cf="  "
libtool: link:  compiler_flags=
libtool: link:  for lt_cf_opt in    -link:-dll; do case  in -link*) echo "X" | /bin/sed -e 
1s/^X// -e s/-link:/-link\ / >> .libs/getopt-0.dll.ld;; *) compiler_flags=" ";; esac; done
libtool: link:  cl -Fe.libs/getopt-0.dll  .libs/getopt.obj    
@.libs/getopt-0.dll.ld
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

cl -link -EXPORT:optarg,DATA
   -link -EXPORT:opterr,DATA
   -link -EXPORT:optind,DATA
   -link -EXPORT:optopt,DATA
   -link -EXPORT:optreset,DATA
   -link -dll

Microsoft (R) Incremental Linker Version 8.00.50727.762
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:.libs/getopt-0.dll
-EXPORT:optarg,DATA
-EXPORT:opterr,DATA
-EXPORT:optind,DATA
-EXPORT:optopt,DATA
-EXPORT:optreset,DATA
-dll
.libs/getopt.obj
   Creating library .libs/getopt-0.lib and object .libs/getopt-0.exp
libtool: link:  compiler_flags="  "
libtool: link:  linknames=
libtool: link: LINK=
libtool: link: ( cd ".libs" && rm -f "libgetopt.la" && cp -p "../libgetopt.la" 
"libgetopt.la" )

$ ./libtool --tag=CC --mode=link cl -no-undefined -o main.exe main.lo 
libgetopt.la
libtool: link: rm -f .libs/main.exe.ld
libtool: link:  func_quote_for_eval LINK=" -LIBPATH:C:/msys/1.0/nowhere" cl -o 
@OUTPUT@ .libs/main.obj  getopt.lib
libtool: link:  lt_save_fc="LINK= -LIBPATH:C:/msys/1.0/nowhere"
libtool: link:  finalize_command=
libtool: link:  for lt_fc_opt in LINK= -LIBPATH:C:/msys/1.0/nowhere; do echo ; case  in -link*) echo 
"X" | /bin/sed -e 1s/^X// -e s/-link:/-link\ / >> .libs/main.exe.ld;; *) 
finalize_command=" ";; esac; echo ; done
LINK=
LINK=
-LIBPATH:C:/msys/1.0/nowhere
LINK= -LIBPATH:C:/msys/1.0/nowhere
libtool: link:  finalize_command=" LINK= -LIBPATH:C:/msys/1.0/nowhere 
@.libs/main.exe.ld"
libtool: link: LINK="" cl -o .libs/main.exe .libs/main.obj  ./.libs/getopt-0.lib
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

cl : Command line warning D9035 : option 'o' has been deprecated and will be 
removed in a future release
Microsoft (R) Incremental Linker Version 8.00.50727.762
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:main.exe
/out:.libs/main.exe
.libs/main.obj
./.libs/getopt-0.lib
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

cl : Command line warning D9035 : option 'o' has been deprecated and will be 
removed in a future release
lt-main.c
Microsoft (R) Incremental Linker Version 8.00.50727.762
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:lt-main.exe
/out:./main.exe
lt-main.obj

$ ./main.exe; echo $?
65

$ cat .libs/getopt.exp
optarg,DATA
opterr,DATA
optind,DATA
optopt,DATA
optreset,DATA

$ cat .libs/getopt-0.dll.ld
-link -EXPORT:optarg,DATA
-link -EXPORT:opterr,DATA
-link -EXPORT:optind,DATA
-link -EXPORT:optopt,DATA
-link -EXPORT:optreset,DATA
-link -dll

> I need to see more of what you are actually trying to do, the real
> libtool invocations and the output they produce etc. Compress the
> output if it is large...

Still holds.

Cheers,
Peter