Re: Cygwin g++ for 'make depend'

On Mon, 12 Feb 2024 03:00:16 -0800 (PST) Gisle Vanem wrote:

GV> In my a GNU-makefile (targeting MSVC), I sometimes use a Cygwin 'g++'
GV> to create dependencies. Like:
GV>   DEP_CFLAGS = -MM $(filter -I% -D%, $(CFLAGS)) \
GV>          --include $(OBJ_DIR)/config.h    \
GV>           -DGCC_MAKE_DEPEND
GV> depend:
GV>    g++ $(DEP_CFLAGS) $(SOURCE) >> .depend.Windows

 Note that this is not going to work for anything conditionally-included
depending on the compiler used.

GV> But when a wxWidget headers notice a '__GNUC__' and/or '__CYGWIN__' is 
GV> involved,
GV> it goes bananas with huge amounts of '#error' statements. 

 I guess it's due to filtering out -D__WXMSW__ from your CFLAGS above, why
do you do it?

GV> So I just fake 'g++' into a MSVC-compiler in my generated
GV> '$(OBJ_DIR)/config.h':
GV>   #if defined(GCC_MAKE_DEPEND)
GV>     #define _MSC_VER            1910
GV>     #define WX CHKCONF H      1
GV>     #define WX MSW CHKCONF H  1
GV>     #define __WXMSW__           1
GV>   #endif
GV>  ....
GV> --------------
GV> 
GV> Is there a better way?

 You could predefine the same symbols on command line, but it's still a
dirty hack, of course.

 Regards,
VZ

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