[ruby-core:116556] [Ruby master Feature#20233] pkg-config not working on MSVC

Issue #20233 has been updated by jmarrec (Julien Marrec).


Potential implemented at https://github.com/ruby/ruby/pull/9815#pullrequestreview-1858695400

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Feature #20233: pkg-config not working on MSVC
https://bugs.ruby-lang.org/issues/20233#change-106573

* Author: jmarrec (Julien Marrec)
* Status: Open
* Priority: Normal
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The PKG_CONFIG variable is not respected in win32/Makefile.sub

Also, need to ideally use the `--msvc-syntax` flag (pkgconf 1.4.0, released 7 years ago, adds it).

But mostly, I realized that the `try_ldflags` in `lib/mkmf.rb` actually passes these ldflags as the `opt` parameter to the `link_command` function, and not as `ldflags`. While the UNIX systems are forgiving, the MSVC compiler is not, and because the flags are passed before the `-link`, MSVC complains that it ignores it and therefore cannot find the requested library.



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