Add scons/3.1.2 recipe

[madebr]

Specify library name and version: scons/3.1.2

This will probably fail on Visual Studio because of an error while linking the test_package:

scons: Entering directory `C:\Users\maarten\source\repos\conan-center-index\recipes\scons\all\test_package'
scons: Reading SConscript files ...
conan-compiler tool is msvc
CC is: cl
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build\882726301a296ee1f7f1d98a3db2003150ea70a8
cl /Fobuild\882726301a296ee1f7f1d98a3db2003150ea70a8\test_package.obj /c test_package.c /nologo
test_package.c
link /nologo /OUT:build\882726301a296ee1f7f1d98a3db2003150ea70a8\test_package.exe /LIBPATH:C:\Users\maarten\.conan\data\scons\3.1.2\_\_\package\5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9\lib build\882726301a296ee1f7f1d98a3db2003150ea70a8\test_package.obj
LINK : fatal error LNK1104: cannot open file 'C:\WINDOWS\lnk{ECD57055-886D-4616-BDF6-EE1EDE9390CA}.tmp'
scons: *** [build\882726301a296ee1f7f1d98a3db2003150ea70a8\test_package.exe] Error 1104
scons: building terminated because of errors.
ERROR: scons/3.1.2 (test package): Error in build() method, line 29
        self.run("scons -C \"{}\" {} --conan-compiler={}".format(self.source_folder, debug_opt, self._script_tool[str(self.settings.compiler)]))
        ConanException: Error 2 while executing scons -C "C:\Users\maarten\source\repos\conan-center-index\recipes\scons\all\test_package"  --conan-compiler=msvc

This is the same error as this bug report: https://scons-users.scons.narkive.com/FRzlVB7H/msvc-error
I think this is a bug in either scons or msvc.

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[conan-center-bot]

All green in build 1 (864d89bf36b7c2c1a9877818fbe6f70b84acb957)! 😊

• scons/3.1.2: Generated 1 packages. All logs here

[conan-center-bot]

Some configurations of 'scons/3.1.2' failed in build 2 (683a2ab12169c2410ce8ecd02fefe7a02e3ac938):

• Macos x86_64, Debug, apple-clang 9.1, libc++
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• Windows x86_64, Debug, Visual Studio 14, MTd
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[conan-center-bot]

All green in build 3 (becd97e439c8878860e2b51b0cd30b2471a898a7)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[madebr]

Works on my pc ==> Works on CI ™️ 😅

[conan-center-bot]

All green in build 4 (90c73c54d62f61a8bbbf6fd1323d361b3f555eef)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[conan-center-bot]

All green in build 5 (14dacc5416ae4ac801bb87960c0096aed3f86043)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[conan-center-bot]

All green in build 6 (029b08f7c107d076e290d93d03e08022302e375d)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[conan-center-bot]

All green in build 8 (029b08f7c107d076e290d93d03e08022302e375d)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[fulara]

@madebr
I also needed to change your sys.executable to just plain invocations of python.
this is because when conan is bundled with the pyinstaller the sys.executable is conan.
So the build fails.

Could this scenario be handled?

[conan-center-bot]

All green in build 19 (808dda93981913fbfecf77736d60a0aa6bc7a7b3)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[conan-center-bot]

Some configurations of 'scons/3.1.2' failed in build 21 (0e244f4316355e4d3c88c14e67ae08e3af58ca57):

• Macos x86_64, Debug, apple-clang 9.1, libc++
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[conan-center-bot]

All green in build 22 (96955f0eeca726c3a5442d30a2600599db0c9c2c)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[madebr]

Should this recipe (optionally) depend on #1510 for a build requirement?
Should we expect users to have a python interpreter installed and available?
Users of the standalone windows conan.exe can be expected to add cpython to the build_requirements section of its profile.

[madebr]

@uilianries @danimtb @SSE4 @jgsogo
Is something holding this back?
I think I addressed the issue about potentially downloading external dependencies.

[conan-center-bot]

Some configurations of 'scons/3.1.2' failed in build 23 (b1272a6dcf4ecde25fb37171677e9a9a2e4f79fb):

• Macos x86_64, Debug, apple-clang 9.1, libc++
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[conan-center-bot]

Some configurations of 'scons/3.1.2' failed in build 24 (d0ba94135259d76fc024a492e841ea9501ec76bc):

• Windows x86_64, Debug, Visual Studio 14, MTd
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[conan-center-bot]

All green in build 25 (aee92c7bdb799ebb2a937dd5e352e440ed92810c)! 😊

• scons/3.1.2: Generated 3 packages. All logs here

[danimtb]

This recipe has some hacky aspects but it made the CI pass so... However, we have to keep in mind that this is a special recipe to consider for future use cases.