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Brad King authored
Since commit ca6ba3fe (Genex: Add a SHELL_PATH expression, 2015-09-24, v3.4.0-rc1~37^2) and commit 21da25d2 (Tests: Generalize GeneratorExpression MSYS path conversion workaround, 2019-03-11, v3.15.0-rc1~407^2~1) we use a prefix string to prevent the MSYS 1.0 shell from converting absolute paths of the form `/c/...` to windows-style paths. In the newer `mingw.osdn.io` distribution of MSYS 1.0, the `bash` shell now also converts paths that appear after `:`. We have no way to add a prefix string in that context, so perform the test's check of the `SHELL_PATH` genex value at generate time instead.
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