configure: Use pkg-config to find libs whenever possible #773
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Use pkg-config to find cppunit, libxml2 and expat. All those libraries provide pkg-config files, and in all of those cases the pkg-config macro is superior to the custom macros used currently. The advantages of pkg-config files include: - Explicit static linking support via --static. Currently, e.g. 'xml2-config --libs' prints all libraries needed for static linking when doing dynamic linking unnecessary, resulting in unnecessary direct deps. - Better cross-build support. You don't have to build the additional *-config tools for target. - Better multilib support. Per-ABI pkgconfig directories are commonly supported while packages usually fail to look for per-CHOST *-config variants. - Better override support. The current macros allow little to no result overrides, the pkg-config macros let you pass FOO_CFLAGS and FOO_LIBS manually. - Cleaner version checks. The code used in libxml.m4 is really creepy.
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Thank you for PR. It looks good to me. We will merge this PR after v1.29.0 is released. |
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Use pkg-config to find cppunit, libxml2 and expat. All those libraries
provide pkg-config files, and in all of those cases the pkg-config macro
is superior to the custom macros used currently.
The advantages of pkg-config files include:
Explicit static linking support via --static. Currently, e.g.
'xml2-config --libs' prints all libraries needed for static linking when
doing dynamic linking unnecessary, resulting in unnecessary direct deps.
Better cross-build support. You don't have to build the additional
*-config tools for target.
Better multilib support. Per-ABI pkgconfig directories are commonly
supported while packages usually fail to look for per-CHOST *-config
variants.
Better override support. The current macros allow little to no
result overrides, the pkg-config macros let you pass FOO_CFLAGS
and FOO_LIBS manually.
Cleaner version checks. The code used in libxml.m4 is really creepy.