This allows Meson native-file [properties] to be used.
This avoids the need to call meson from a script file or have a
long command line invocation of `meson setup`
The method meson.get_native_property('prop', 'fallback') is added.
The native file can contain properties like
```
[properties]
myprop1 = 'foo'
mydir2 = 'lib/custom'
```
Then from within `meson.build`
```meson
x1 = meson.get_native_property('myprop1')
thedir = meson.get_native_property('mydir2', 'libs')
```
fallback values are optional
When subdir is '/foo/bar' and prefix '/foo' it was returning '/bar',
which is an absolute path. It was then constructing '-L${prefix}//bar'
with bogus double slash.
When subdir is '/fooo/bar' and prefix '/foo' it was returning 'o/bar'.
* Extend test_prefix_dependent_defaults unit test to cover default case
Extend test_prefix_dependent_defaults unit test to cover the default
case, when the default prefix is '/usr/local'. (On Windows, the default
prefix is 'c:/')
* Restore adjusting option defaults depending on the default prefix
Restore adjusting option defaults, depending on the default prefix.
Droppped in d778a371
The kludgy method we use to get env vars from vcvarsall.bat into our
environment doesn't correctly handle env var values which contain
newlines.
The BUILD_SOURCEVERSIONMESSAGE environment variable contains the
entirety of the commit message. If a line containing an equals sign
appears in the commit message, we could have problems.
Unset that environment variable to workaround this problem.
I've tested this on FreeBSD, and dragonfly's userland is close enough
I'm willing to call it good without testing. OpenBSD and NetBSD also
have a zlib in their base configurations, but I'm not confident enough
to enable those without testing.
This comes pre-installed, but currently we don't have a way to detect it
without relying on pkg-config or cmake. This is only valid with the
apple clang-based compilers, as they do some special magic to get
headers.
There is a comment saying we do it because we used to do it. But it's
wrong and lead to using system library when cross compiling.
Factor out the code we use to find pkg-config, because it is the same
use-case.
The CMake config files / modules have to be checked
case insensitive in some cases, otherwise some dependencies
will not be found even though they are installed.