godot-cpp fails to build in MSYS2 environment

[hansemro]

• OS: Windows 10 Pro
• Shell/Environment: MSYS2 downloaded from https://www.msys2.org/
• MSYS2 packages installed with pacman -S mingw-w64-cross-gcc scons make git:

$ pacman -S mingw-w64-cross-gcc scons make git
resolving dependencies...
looking for conflicting packages...

Packages (45) heimdal-7.7.0-3  isl-0.22.1-1  libcbor-0.9.0-1  libfido2-1.10.0-1
              mingw-w64-cross-binutils-2.37-1
              mingw-w64-cross-crt-git-9.0.0.6158.1c773877-1
              mingw-w64-cross-headers-git-9.0.0.6158.1c773877-1
              mingw-w64-cross-windows-default-manifest-6.4-2
              mingw-w64-cross-winpthreads-git-9.0.0.6158.1c773877-1
              mpc-1.2.1-1  mpdecimal-2.5.0-1  openssh-8.9p1-3
              perl-Authen-SASL-2.16-2  perl-Clone-0.45-2
              perl-Convert-BinHex-1.125-1  perl-Encode-Locale-1.05-1
              perl-Error-0.17029-1  perl-File-Listing-6.14-1
              perl-HTML-Parser-3.76-1  perl-HTML-Tagset-3.20-2
              perl-HTTP-Cookies-6.10-1  perl-HTTP-Daemon-6.12-1
              perl-HTTP-Date-6.05-1  perl-HTTP-Message-6.36-1
              perl-HTTP-Negotiate-6.01-2  perl-IO-HTML-1.004-1
              perl-IO-Socket-SSL-2.074-1  perl-IO-Stringy-2.113-1
              perl-LWP-MediaTypes-6.04-1  perl-MIME-tools-5.509-1
              perl-MailTools-2.21-1  perl-Net-HTTP-6.22-1
              perl-Net-SMTP-SSL-1.04-1  perl-Net-SSLeay-1.90-1
              perl-TermReadKey-2.38-2  perl-TimeDate-2.33-1
              perl-Try-Tiny-0.31-1  perl-URI-5.10-1  perl-WWW-RobotRules-6.02-2
              perl-libwww-6.57-1  python-3.9.9-2  git-2.35.1-3  make-4.3-3
              mingw-w64-cross-gcc-10.2.0-1  scons-3.1.2-7

Issue: godot-cpp/SConstruct fails to recognize MSYS2 environment as a valid platform and raises an error.

In MSYS2-provided python3.9, sys.platform reports cygwin which does not fall under any category to set host_platform in godot-cpp/SConstruct.

Error:

$ make PLATFORM=windows build
cd godot-cpp && scons use_mingw=true platform=windows target=debug generate_bindings=yes -j4
scons: Reading SConscript files ...
ValueError: Could not detect platform automatically, please specify with platform=<platform>:
  File "/c/Users/Hansem Ro/Documents/GDClip/godot-cpp/SConstruct", line 80:
    raise ValueError("Could not detect platform automatically, please specify with platform=<platform>")
make: *** [Makefile:24: godot-cpp/bin/libgodot-cpp.windows.debug.64.a] Error 2

Workaround: Treat cygwin as linux host platform:

Replace if sys.platform.startswith("linux"): (line 71) in godot-cpp/SConstruct with if sys.platform.startswith("linux") or sys.platform == "cygwin":

With this workaround, gdclip library successfully builds and works perfectly in GDClip demo.

Comments

I am unsure why sys.platform reports "cygwin" when other users report "msys".