fix for perl 5.42

[wangvisual]

for issue #13
this patch is done by Claude Opus 4.5 and inspired by bulk88

[rocky]

When I build, I get this error:

. Can't load '/tmp/Enbugger/blib/arch/auto/Enbugger/Enbugger.so' for module Enbugger: /tmp/Enbugger/blib/arch/auto/Enbugger/Enbugger.so: undefined symbol: GvREFCNT_inc at /usr/lib/x86_64-linux-gnu/perl-base/DynaLoader.pm line 201.

Here is a full log:

$ perl Makefile.PL
Generating a Unix-style Makefile
Writing Makefile for Enbugger
Writing MYMETA.yml and MYMETA.json
$ make test
Running Mkbootstrap for Enbugger ()
chmod 644 "Enbugger.bs"
"/usr/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- Enbugger.bs blib/arch/auto/Enbugger/Enbugger.bs 644
"/usr/bin/perl" "/usr/share/perl/5.38/ExtUtils/xsubpp"  -typemap '/usr/share/perl/5.38/ExtUtils/typemap'  Enbugger.xs > Enbugger.xsc
mv Enbugger.xsc Enbugger.c
x86_64-linux-gnu-gcc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g   -DVERSION=\"2.016\" -DXS_VERSION=\"2.016\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.38/CORE"   Enbugger.c
Enbugger.xs: In function ‘Perl_init_debugger’:
Enbugger.xs:67:15: warning: implicit declaration of function ‘GvREFCNT_inc’; did you mean ‘SvREFCNT_inc’? [-Wimplicit-function-declaration]
   67 |     PL_DBgv = GvREFCNT_inc(gv_fetchpvs("DB::DB", GV_ADDMULTI, SVt_PVGV));
      |               ^~~~~~~~~~~~
      |               SvREFCNT_inc
Enbugger.xs:67:13: warning: assignment to ‘GV *’ {aka ‘struct gv *’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   67 |     PL_DBgv = GvREFCNT_inc(gv_fetchpvs("DB::DB", GV_ADDMULTI, SVt_PVGV));
      |             ^
Enbugger.xs:68:15: warning: assignment to ‘GV *’ {aka ‘struct gv *’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   68 |     PL_DBline = GvREFCNT_inc(gv_fetchpvs("DB::dbline", GV_ADDMULTI, SVt_PVAV));
      |               ^
Enbugger.xs:69:14: warning: assignment to ‘GV *’ {aka ‘struct gv *’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   69 |     PL_DBsub = GvREFCNT_inc(gv_HVadd(gv_fetchpvs("DB::sub", GV_ADDMULTI, SVt_PVHV)));
      |              ^
Enbugger.xs: In function ‘alter_cop’:
Enbugger.xs:150:37: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘U32’ {aka ‘unsigned int’} [-Wformat=]
  150 |       PerlIO_printf(Perl_debug_log, "Enbugger: SvOK(o)=%"UVuf" SvROK(o)=%"UVuf" SvIOK(SvRV(o))=%"UVuf"\n",
      |                                     ^~~~~~~~~~~~~~~~~~~~~
Enbugger.xs:150:37: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘U32’ {aka ‘unsigned int’} [-Wformat=]
  150 |       PerlIO_printf(Perl_debug_log, "Enbugger: SvOK(o)=%"UVuf" SvROK(o)=%"UVuf" SvIOK(SvRV(o))=%"UVuf"\n",
      |                                     ^~~~~~~~~~~~~~~~~~~~~
Enbugger.xs:150:37: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘U32’ {aka ‘unsigned int’} [-Wformat=]
  150 |       PerlIO_printf(Perl_debug_log, "Enbugger: SvOK(o)=%"UVuf" SvROK(o)=%"UVuf" SvIOK(SvRV(o))=%"UVuf"\n",
      |                                     ^~~~~~~~~~~~~~~~~~~~~
rm -f blib/arch/auto/Enbugger/Enbugger.so
x86_64-linux-gnu-gcc  -shared -L/usr/local/lib -fstack-protector-strong  Enbugger.o  -o blib/arch/auto/Enbugger/Enbugger.so  \
      \
  
chmod 755 blib/arch/auto/Enbugger/Enbugger.so
cp lib/Enbugger/ebug.pm blib/lib/Enbugger/ebug.pm
cp lib/Enbugger.pm blib/lib/Enbugger.pm
cp lib/Enbugger/trepan.pm blib/lib/Enbugger/trepan.pm
cp lib/Enbugger/ptkdb.pm blib/lib/Enbugger/ptkdb.pm
cp lib/Enbugger.pod blib/lib/Enbugger.pod
cp lib/Enbugger/OnError.pm blib/lib/Enbugger/OnError.pm
cp lib/Enbugger/perl5db.pm blib/lib/Enbugger/perl5db.pm
cp lib/Enbugger/NYTProf.pm blib/lib/Enbugger/NYTProf.pm
cp lib/Enbugger/sdb.pm blib/lib/Enbugger/sdb.pm
cp bin/screen-server blib/script/screen-server
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/screen-server
cp bin/screen-server-backend blib/script/screen-server-backend
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/screen-server-backend
cp bin/tmux-server blib/script/tmux-server
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/tmux-server
cp bin/tmux-server-backend blib/script/tmux-server-backend
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/tmux-server-backend
cp bin/xterm-server blib/script/xterm-server
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/xterm-server
cp bin/xterm-server-backend blib/script/xterm-server-backend
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/xterm-server-backend
PERL_DL_NONLAZY=1 "/usr/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/10load.t ...... Can't load '/tmp/Enbugger/blib/arch/auto/Enbugger/Enbugger.so' for module Enbugger: /tmp/Enbugger/blib/arch/auto/Enbugger/Enbugger.so: undefined symbol: GvREFCNT_inc at /usr/lib/x86_64-linux-gnu/perl-base/DynaLoader.pm line 201.
\0 at t/10load.t line 32.

[rocky]

I should say that this was for Perl 5.38.