Re^3: Issue: Encode.so: undefined symbol: PL

I am now looking into an option of explicitly compiling header perl.h directly into my extension library. But I am getting the error below.

My Error:

x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC -I/usr/lib/perl/5.18/CORE -I/usr/include -I/usr/local/include -I/usr/include/python3.4m -I/home/losintikfos/git/testproj/env/include/python3.4m -c src/pymechanize.c -o build/temp.linux-x86_64-3.4/src/pymechanize.o -O0 -g3 -Wall -c -fmessage-length=0 -Wl,-E -fstack-protector -L/usr/local/lib -L/usr/lib/perl/5.18/CORE -lperl -ldl -lm -lpthread -lc -lcrypt -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/lib/perl/5.18/CORE
In file included from /usr/lib/perl/5.18/CORE/perl.h:2513:0,
                 from src/pymechanize.c:297:
/usr/lib/perl/5.18/CORE/handy.h:873:1: error: unknown type name ‘EXTCONST’
 EXTCONST U32 PL_charclass[];
 ^
/usr/lib/perl/5.18/CORE/handy.h:873:14: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘PL_charclass’
 EXTCONST U32 PL_charclass[];
              ^
In file included from /usr/lib/perl/5.18/CORE/regexp.h:21:0,
                 from /usr/lib/perl/5.18/CORE/perl.h:3472,
                 from src/pymechanize.c:297:
/usr/lib/perl/5.18/CORE/utf8.h:100:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘unsigned’
 EXTCONST unsigned char PL_utf8skip[];
          ^
In file included from src/pymechanize.c:297:0:
/usr/lib/perl/5.18/CORE/perl.h:4254:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char’
 EXTCONST char PL_warn_uninit[]
          ^
/usr/lib/perl/5.18/CORE/perl.h:4256:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char’
 EXTCONST char PL_warn_uninit_sv[]
          ^
/usr/lib/perl/5.18/CORE/perl.h:4258:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char’
 EXTCONST char PL_warn_nosemi[]
          ^
/usr/lib/perl/5.18/CORE/perl.h:4260:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char’
 EXTCONST char PL_warn_reserved[]
          ^
/usr/lib/perl/5.18/CORE/perl.h:4262:10: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char

....

Any ideas monks.

Comment on Re^3: Issue: Encode.so: undefined symbol: PL_utf8skip

Replies are listed 'Best First'.
Re^4: Issue: Encode.so: undefined symbol: PL_utf8skip by losintikfos (Novice) on Jul 25, 2015 at 21:35 UTC
Compiled EXTERN.h before perl.h removed the errors: /usr/lib/perl/5.18/CORE/handy.h:873:1: error: unknown type name ‘EXTCONST’ EXTCONST U32 PL_charclass[]; ^ .. But doesn't resolve the issue undefined symbol: PL_utf8skip.	[reply]
Re^5: Issue: Encode.so: undefined symbol: PL_utf8skip by syphilis (Archbishop) on Jul 26, 2015 at 02:10 UTC
But doesn't resolve the issue undefined symbol: PL_utf8skip As already intimated, the symbol should be resolved by linking to libperl.a - and you seem to be linking to that file. So ... you need to find out why that's not doing the trick. Could it be to do with the order in which you're linking to the various libraries ? I don't know. We do know that libperl.a (probably /usr/lib/perl/5.18/CORE/libperl.a) is being found - otherwise it's a fatal error at build time. Cheers, Rob	[reply]
Re^6: Issue: Encode.so: undefined symbol: PL_utf8skip by losintikfos (Novice) on Jul 28, 2015 at 08:37 UTC
I have tried only libperl and still the same. When I run nm on my output shared library - there is not a lot of symbols expose by libperl: U perl_alloc U perl_construct U perl_destruct U perl_free U perl_parse 000000000022f748 b my_perl U Perl_call_method U Perl_call_pv U Perl_eval_pv U Perl_free_tmps U Perl_gv_add_by_type U Perl_hv_clear U Perl_hv_common_key_len U Perl_hv_undef_flags U Perl_markstack_grow U Perl_newRV U Perl_newRV_noinc U Perl_newSViv U Perl_newSVpv U Perl_newSVsv U Perl_newSV_type U Perl_newXS U Perl_pop_scope U Perl_push_scope U Perl_save_int U Perl_stack_grow U Perl_sv_2bool_flags U Perl_sv_2mortal U Perl_sv_2pv_flags	[reply]