Native-comp branch compilation error on Windows

[Liāu , Kiong-Gē 廖宮毅]

Hi,

I used last updated Msys2 as 2020-12-16 to install mingw64-x86_64
version (10.2) of gcc and libgccjit to compile native-comp branch on
Windows 10.

I configured the build with flag --with-nativecomp, while compile it,
I got the following error message:

comp.c: In function 'Fcomp_el_to_eln_filename':
comp.c:4110:36: error: expected ')' before 'PATH_REL_LOADSEARCH'
 4110 |    Fregexp_quote (build_string ("/" PATH_REL_LOADSEARCH "/")));
      |                                    ^~~~~~~~~~~~~~~~~~~~
      |                                    )
comp.c: In function 'Fcomp__compile_ctxt_to_file':
comp.c:4458:12: warning: unused variable 'oldset' [-Wunused-variable]
 4458 |   sigset_t oldset;
      |            ^~~~~~
comp.c: In function 'eln_load_path_final_clean_up':
comp.c:4621:29: warning: passing argument 1 of
'internal_condition_case_4' from incompatible pointer type
[-Wincompatible-pointer-types]
 4621 |  internal_condition_case_4 (Fdirectory_files,
      |                             ^~~~~~~~~~~~~~~~
      |                             |
      |                             struct Lisp_X * (*)(struct Lisp_X
*, struct Lisp_X *, struct Lisp_X *, struct Lisp_X *, struct Lisp_X *)
In file included from comp.c:23:
lisp.h:4160:47: note: expected 'struct Lisp_X * (*)(struct Lisp_X *,
struct Lisp_X *, struct Lisp_X *, struct Lisp_X *)' but argument is of
type 'struct Lisp_X * (*)(struct Lisp_X *, struct Lisp_X *, struct
Lisp_X *, struct Lisp_X *, struct Lisp_X *)'
 4160 | extern Lisp_Object internal_condition_case_4 (Lisp_Object (*)
(Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object), Lisp_Object,
Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object (*)
(Lisp_Object));
      |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[1]: *** [Makefile:410: comp.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/home/VWinUser0/Downloads/emacs/native-comp/src'
make: *** [Makefile:433: src] Error 2


However, with exactly the same emacs source code and configuration,
the compilation on Linux (Debian testing, gcc/gccjit  10.2) went well
without any issue.

Should I pass some special flags in configure or compilers to build
the native-comp branch on Windows?

Thanks,
Kiong-Ge.