Compile error with TCL 8.7.a4

[teclabat]

photoresize compiles fine using TCL 8.6 on W10 and Ubuntu flavours.
Using TCL 8.7a4 (latest commit as from bug filing) it compiles in W10 but fails in Ubuntu 16/18/20 with below error,
photoresize master branch, latest commit:

./generic/photoresize_wrap.cpp:1084:42: error: invalid type argument of unary ‘*’ (have ‘long int’)

g++ -DPACKAGE_NAME=\"photoresize\" -DPACKAGE_TARNAME=\"photoresize\" -DPACKAGE_VERSION=\"0.1\" -DPACKAGE_STRING=\"photoresize\ 0.1\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -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 -DHAVE_LIMITS_H=1 -DHAVE_SYS_PARAM_H=1 -DUSE_THREAD_ALLOC=1 -D_REENTRANT=1 -D_THREAD_SAFE=1 -DTCL_THREADS=1 -DMODULE_SCOPE=extern\ __attribute__\(\(__visibility__\(\"hidden\"\)\)\) -D_LARGEFILE64_SOURCE=1 -DTCL_WIDE_INT_IS_LONG=1 -DUSE_TCL_STUBS=1 -DUSE_TK_STUBS=1  -I"/home/gitlab-runner/builds/nAUPxsbg/0/products/tcltk/rcompile/tcl/generic" -I"/home/gitlab-runner/builds/nAUPxsbg/0/products/tcltk/rcompile/tk/generic"     -pipe -m64 -O2 -fomit-frame-pointer -Wall -fPIC  -c `echo ./generic/photoresize_wrap.cpp` -o photoresize_wrap.o
In file included from /home/gitlab-runner/builds/nAUPxsbg/0/products/tcltk/rcompile/tcl/generic/tcl.h:2388:0,
                 from ./generic/photoresize_wrap.cpp:164:
./generic/photoresize_wrap.cpp: In function ‘int SWIG_Tcl_ConvertPtrFromString(Tcl_Interp*, const char*, void**, swig_type_info*, int)’:
./generic/photoresize_wrap.cpp:1084:42: error: invalid type argument of unary ‘*’ (have ‘long int’)
       if (*(Tcl_GetStringFromObj(result, NULL)) == 0) {

Regards

[auriocus]

Not sure if this is a bug in photoresize, or in your Tcl headers?
The error says thet Tcl_GetStringFromObj() returns "long int", which is extremely strange, since it returns "char *" in previous versions - the only sensible thing for a C string. Could you check the prototypes?

[teclabat]

Yes, still defined as char*:

EXTERN char * Tcl_GetStringFromObj(Tcl_Obj *objPtr, int *lengthPtr);

(TCL 8.7 file tclDecls.h)

[auriocus]

Then it doesn't make any sense to me. Maybe it is related to the stubs thing - actually Tcl_ functions are macros expanding into some entry of the stub table. If you could run the preprocessor, maybe that makes it clearer.
BTW, that code has nothing to do with photoresize - it is the wrapper code generated by SWIG, so it would hit any other projcect using SWIG as well.

[teclabat]

I will do some further testing and see if I get any wiser ...

thx for your support!