Re: [feature/native-comp] breakage on build

[Eli Zaretskii <eliz@gnu.org>]

> From: Phillip Lord <phillip.lord@russet.org.uk>
> Cc: akrl@sdf.org,  emacs-devel@gnu.org
> Date: Fri, 05 Feb 2021 20:37:31 +0000
> 
> I have checked the library paths as well as I know how (gcc
> --print-search-dirs). I have reformatted the output with some new lines
> to make it readable.

I'm not sure I understand: do these directories really exist, and do
they hold the libraries gcc is looking for?  I mean these directories:

> ** Search paths (broken)
>    gcc --print-search-dirs
>    install: c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/
>    programs: =c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/;c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/;c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/x86_64-w64-mingw32/10.2.0/;c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/
> 
>    libraries:
>    =c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/x86_64-w64-mingw32/10.2.0/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/../lib/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../x86_64-w64-mingw32/10.2.0/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../lib/;
>    D:/a/_temp/msys/msys64/mingw64/x86_64-w64-mingw32/lib/x86_64-w64-mingw32/10.2.0/;
>    D:/a/_temp/msys/msys64/mingw64/x86_64-w64-mingw32/lib/../lib/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/;
>    c:/Users/Administrator/Desktop/emacs-28.0.50-snapshot-feature_native-comp-windows-2021-02-04/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../;
>    D:/a/_temp/msys/msys64/mingw64/x86_64-w64-mingw32/lib/

If they do exist, does it mean you duplicated the entire MinGW GCC
installation under the same directory that is the parent of the
Emacs's bin/ directory?

What does the following command produce?

  gcc -print-file-name=crtbegin.o

> The equivalent version for an Emacs run from mingw64 shell (which works
> and JIT compiles), I get this.
> 
> 
> 
> ** Search paths (working)
> 
>    gcc --print-search-dirs
> install: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/
> programs: =C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/;C:/msys64/mingw64/bin/../lib/gcc/;C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw324/10.2.0/../../../../x86_64-w64-mingw32/bin/x86_64-w64-mingw32/10.2.0/;C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/
> 
>    libraries:
>    =C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/;
>    C:/msys64/mingw64/bin/../lib/gcc/;
>    C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/x86_64-w64-mingw32/10.2.0/;
>    C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/../lib/;
>    C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../x86_64-w64-mingw32/10.2.0/;
>    C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../lib/;
>    D:/a/_temp/msys/msys64/mingw64/x86_64-w64-mingw32/lib/x86_64-w64-mingw32/10.2.0/;D:/a/_temp/msys/msys64/mingw64/x86_64-w64-mingw32/lib/../lib/;
>    C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/;
>    C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../;D:/a/_temp/msys/msys64/mingw64/x86_64-w64-mingw32/lib/

Does the mingw64 shell set some GCC-related environment variables,
like COMPILER_PATH or LIBRARY_PATH?

Alternatively, could it be that under the mingw64 shell Emacs invokes
a different copy of gcc/libgccjit, the one that is in its "normal"
installation tree and not in the Emacs tree?