Re: Using Perl's cc

[Eli Zaretskii]

> Date: Sat, 11 Jul 2015 15:04:57 +0100
> From: Gavin Smith <address@hidden>
> Cc: address@hidden
> 
> PAD_SV in turn is defined in /usr/lib/perl5/CORE/pad.h:
> 
> #ifdef DEBUGGING
> #  define PAD_SV(po)       pad_sv(po)
> #  define PAD_SETSV(po,sv) pad_setsv(po,sv)
> #else
> #  define PAD_SV(po)       (PL_curpad[po])
> #  define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
> #endif

Yes, and then there's this in embed.h I have here:

  #define pad_sv(a)                Perl_pad_sv(aTHX_ a)

> If the pad_sv symbol isn't found, it's likely the headers aren't
> matching the libraries being used.

Unlikely: I even produced the library myself, using make_implib.pl,
and the result still didn't have Perl_pad_sv import in it.

> Another problem could be the command-line flags passed to the
> compiler: did you see anything like -DDEBUGGING when the files were
> being compiled?

Yes.  Here's the full compilation command line:

  /bin/sh ./libtool  --tag=CC   --mode=compile gcc -DPACKAGE_NAME=\"texinfo\" 
-DPACKAGE_TARNAME=\"texinfo\" -DPACKAGE_VERSION=\"6.0\" 
-DPACKAGE_STRING=\"texinfo\6.0\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" 
-DPACKAGE=\"texinfo\" -DVERSION=\"6.0\" -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 
-DLT_OBJDIR=\".libs/\" -I.    -DPERL_USE_SAFE_PUTENV -DDEBUGGING    
-DVERSION=\"6.0\"  -DXS_VERSION=\"6.0\" "-I/d/usr/Perl/lib/CORE" -gdwarf-4 -g3 
-O2 -MT mylib/XSParagraph_la-xspara.lo -MD -MP -MF 
mylib/.deps/XSParagraph_la-xspara.Tpo -c -o mylib/XSParagraph_la-xspara.lo 
`test -f 'mylib/xspara.c' || echo './'`mylib/xspara.c
  libtool: compile:  gcc -DPACKAGE_NAME=\"texinfo\" 
-DPACKAGE_TARNAME=\"texinfo\" -DPACKAGE_VERSION=\"6.0\" 
"-DPACKAGE_STRING=\"texinfo 6.0\"" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" 
-DPACKAGE=\"texinfo\" -DVERSION=\"6.0\" -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 
-DLT_OBJDIR=\".libs/\" -I. -DPERL_USE_SAFE_PUTENV -DDEBUGGING -DVERSION=\"6.0\" 
-DXS_VERSION=\"6.0\" -I/d/usr/Perl/lib/CORE -gdwarf-4 -g3 -O2 -MT 
mylib/XSParagraph_la-xspara.lo -MD -MP -MF 
mylib/.deps/XSParagraph_la-xspara.Tpo -c mylib/xspara.c  -DDLL_EXPORT -DPIC -o 
mylib/.libs/XSParagraph_la-xspara.o

> The fact you had to override PERL_INC suggests that the compiler flags
> should also have been overridden (e.g. use the right installed Perl in
> the fetch_conf.pl script), but might not have been.

Ah, you are right.  For some reason, I thought you only take the -I
options from the ccflags configuration variable.  So now I tried:

  $ make PERL_INC=/d/usr/Perl/lib/CORE LDFLAGS='-no-undefined 
-L/d/usr/Perl/lib/CORE -lperl520' PERL_CONF_ccflags='-DWIN32 
-DPERL_TEXTMODE_SCRIPTS -DUSE_SITECUSTOMIZE -DPERL_IMPLICIT_CONTEXT 
-DPERL_IMPLICIT_SYS -DUSE_PERLIO'

and got these compilation errors:

  mylib/xspara.c: In function 'xspara_hello':
  d:/usr/Perl/lib/CORE/perl.h:155:16: error: 'my_perl' undeclared (first use in 
this function)
   #  define aTHX my_perl
                  ^
  d:/usr/Perl/lib/CORE/embedvar.h:38:18: note: in expansion of macro 'aTHX'
   #    define vTHX aTHX
                    ^
  d:/usr/Perl/lib/CORE/embedvar.h:58:19: note: in expansion of macro 'vTHX'
   #define PL_Mem   (vTHX->IMem)
                     ^
  d:/usr/Perl/lib/CORE/iperlsys.h:809:4: note: in expansion of macro 'PL_Mem'
    (*PL_Mem->pMalloc)(PL_Mem, (size))
      ^
  d:/usr/Perl/lib/CORE/XSUB.h:563:21: note: in expansion of macro 
'PerlMem_malloc'

   #    define malloc  PerlMem_malloc
                       ^
  mylib/xspara.c:225:17: note: in expansion of macro 'malloc'
     utf8_locale = malloc (len + 6 + 1); /* enough to add ".UTF-8" to end */
                   ^
  d:/usr/Perl/lib/CORE/perl.h:155:16: note: each undeclared identifier is 
reported only once for each function it appears in
   #  define aTHX my_perl
                  ^
  d:/usr/Perl/lib/CORE/embedvar.h:38:18: note: in expansion of macro 'aTHX'
   #    define vTHX aTHX
                    ^
  d:/usr/Perl/lib/CORE/embedvar.h:58:19: note: in expansion of macro 'vTHX'
   #define PL_Mem   (vTHX->IMem)
                     ^
  d:/usr/Perl/lib/CORE/iperlsys.h:809:4: note: in expansion of macro 'PL_Mem'
    (*PL_Mem->pMalloc)(PL_Mem, (size))
      ^
  d:/usr/Perl/lib/CORE/XSUB.h:563:21: note: in expansion of macro 
'PerlMem_malloc'

   #    define malloc  PerlMem_malloc
                       ^
  mylib/xspara.c:225:17: note: in expansion of macro 'malloc'
     utf8_locale = malloc (len + 6 + 1); /* enough to add ".UTF-8" to end */
                   ^
  mylib/xspara.c: In function 'xspara_add_text':
  d:/usr/Perl/lib/CORE/perl.h:155:16: error: 'my_perl' undeclared (first use in 
this function)
   #  define aTHX my_perl
                  ^
  d:/usr/Perl/lib/CORE/embedvar.h:38:18: note: in expansion of macro 'aTHX'
   #    define vTHX aTHX
                    ^
  d:/usr/Perl/lib/CORE/embedvar.h:58:19: note: in expansion of macro 'vTHX'
   #define PL_Mem   (vTHX->IMem)
                     ^
  d:/usr/Perl/lib/CORE/iperlsys.h:813:4: note: in expansion of macro 'PL_Mem'
    (*PL_Mem->pFree)(PL_Mem, (buf))
      ^
  d:/usr/Perl/lib/CORE/XSUB.h:565:19: note: in expansion of macro 'PerlMem_free'
   #    define free  PerlMem_free
                     ^
  mylib/xspara.c:902:31: note: in expansion of macro 'free'
                                 free (new_space.text);
                                 ^
  Makefile:455: recipe for target `mylib/XSParagraph_la-xspara.lo' failed
  make[1]: *** [mylib/XSParagraph_la-xspara.lo] Error 1

Where should my_perl be defined?

For the record, the compilation flags are now as follows:

  libtool: compile:  gcc -DPACKAGE_NAME=\"texinfo\" 
-DPACKAGE_TARNAME=\"texinfo\" -DPACKAGE_VERSION=\"6.0\" 
"-DPACKAGE_STRING=\"texinfo 6.0\"" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" 
-DPACKAGE=\"texinfo\" -DVERSION=\"6.0\" -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 
-DLT_OBJDIR=\".libs/\" -I. -DWIN32 -DPERL_TEXTMODE_SCRIPTS -DUSE_SITECUSTOMIZE 
-DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DVERSION=\"6.0\" 
-DXS_VERSION=\"6.0\" -I/d/usr/Perl/lib/CORE -gdwarf-4 -g3 -O2 -MT 
mylib/XSParagraph_la-xspara.lo -MD -MP -MF 
mylib/.deps/XSParagraph_la-xspara.Tpo -c mylib/xspara.c  -DDLL_EXPORT -DPIC -o 
mylib/.libs/XSParagraph_la-xspara.o