Test MSYS2 build variants

[umarcor]

This PR is not to be merged, but for showing some issues when trying multiple build options on MSYS2:

Default

This is the PKGBUILD upstreamed to msys2/MINGW-packages. It generates two packages: ghdl-mcode for MINGW32 and ghdl-llvm for MINGW64. It is tested as a reference, since it is known to work.

Clang

Same PKGBUILD as the 'Default', but using Clang instead of GCC by setting the following envvars:

export CC=clang
export CXX=clang++

On MINGW32 (mcode), the build fails because the machine is not detected properly:

Unsupported i686-w64-windows-gnu build for mcode

I could fix that by patching configure (see commit msys2: fix MINGW32 detection). However, the build then fails with:

 clang -c -g -DWITH_GNAT_RUN_TIME -o chkstk.o D:/a/ghdl/ghdl/msys2/clang/src/build-i686/../../../../src/grt/config/chkstk.S
D:/a/ghdl/ghdl/msys2/clang/src/build-i686/../../../../src/grt/config/chkstk.S:52:2: error: unknown directive
 .ident "Written by T.Gingold"
 ^
make: *** [../../../../src/grt/Makefile.inc:228: chkstk.o] Error 1

On MINGW64 (LLVM), the build is successful, but the testsuite needs to be executed with CC=gcc, otherwise bug097 fails with:

gna bug097: failed
/mingw64/bin/clang
clang: error: unsupported option '-fPIC' for target 'x86_64-w64-windows-gnu'

LLVM

Instead of using different backends, in this case LLVM is used both on MINGW32 and MINGW64. The compiler is GCC.

On MINGW64, the build is successful and the testsuite too. In fact, this is the same context as the Default.

On MINGW32, the build fails with a not very meaningful error:

gcc -c -g -gnatecD:/a/ghdl/ghdl/msys2/llvm/src/build-i686/../../../../src/grt/grt.adc -gnatdY run-bind.adb
gnatmake: "run-bind.adb" compilation error
make: *** [../../../../src/grt/Makefile.inc:153: grt/run-bind.o] Error 4

Static

Same PKGBUILD as the 'Default', with libghdl_static.diff patch borrowed from open-tool-forge/fpga-toolchain.

On MINGW32 (mcode), the build and the testsuite are successful.

On MINGW64 (LLVM), the build is successful but the first sanity test fails with:

sanity 000hello: failed
  analyze hello.vhdl
  elaborate and simulate hello
  D:/a/_temp/msys/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\ghdl\ghdl\msys2\static\src\build-x86_64\lib/ghdl/libgrt.a(grt-vcdz.o): in function `grt__vcdz__my_vcd_put':
  D:/a/ghdl/ghdl/src/grt/grt-vcdz.adb:43: undefined reference to `gzwrite'
  D:/a/_temp/msys/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\ghdl\ghdl\msys2\static\src\build-x86_64\lib/ghdl/libgrt.a(grt-vcdz.o): in function `grt__vcdz__my_vcd_putc':
  D:/a/ghdl/ghdl/src/grt/grt-vcdz.adb:51: undefined reference to `gzputc'
  D:/a/_temp/msys/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\ghdl\ghdl\msys2\static\src\build-x86_64\lib/ghdl/libgrt.a(grt-vcdz.o): in function `grt__vcdz__my_vcd_close':
  D:/a/ghdl/ghdl/src/grt/grt-vcdz.adb:56: undefined reference to `gzclose'
  D:/a/_temp/msys/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\ghdl\ghdl\msys2\static\src\build-x86_64\lib/ghdl/libgrt.a(grt-vcdz.o): in function `grt__vcdz__vcdz_option':
...

LLVM static

Mixture of 'LLVM' and 'Static'. An attempt at generating static builds with LLVM backend on both MINGW32 and MINGW64.

On MINGW64, the build is successful but the first sanity test fails as in case 'Static'.

On MINGW32, the build fails as in case 'LLVM'.