Use a single check for both cases when we have includes and when we
don't. This way we ensure three things:
1. Built-in checks are 100% reliable with clang and on macOS since clang
implements __has_builtin
2. When the #include is present, this ensures that __builtin_func is not
checked for (because of MSYS, and because it is faster)
3. We fallback to checking __builtin_func when all else fails
prefix might define _GNU_SOURCE, which *must* be defined before your
first include of limits.h, so we must define it first.
There's not really any downsides to including limits.h after the
prefix.
Our "43 has function" test should also work with clang and icc on Linux,
so enable them. Also detect builtins with __has_builtin if available,
which is much faster on clang.
There is a feature request for the same with GCC too:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66970
If it's available, it's much much faster than doing #include
+ preprocess. Speeds up has_header checks by about 40% for me.
Currently, only Clang supports this
With the exception of things like sysconfdir (/etc), every other
installation directory option must be inside the prefix.
Also move the prefix checks to coredata.py since prefix can also be set
from inside project() with default_options and via mesonconf. Earlier
you could set prefix to a relative path that way.
This also allows us to return consistent values for get_option('xxxdir')
regardless of whether relative paths are passed or absolute paths are
passed while setting options on the command-line, via mesonconf, or via
default_options in project(). Now the returned path will *always* be
relative to the prefix.
Includes a unit test for this, and a failing test.
Closes#1299
These two are also C-like sources, so don't ignore them in
backends/ninjabackend.py:generate_target() when we call
is_source() on the list of generated sources for that target.
Closes#1318
Fetching cflags and libs can also fail if, for instance, the pkg-config
file for a dependency needed by this package isn't found. Without this,
we will print "Found: YES" and then "Found: NO".
Without this, macOS users can't figure out why a particular dependency
wasn't found because the pkg-config error message gets masked by the
fresh and useless DependencyException.
Don't need to define __init__ and manually call the parent init. Doing
so messes up the error message you get by doing str(exception) because
it includes the current class name in it repeatedly.
Nirbheek Chauhan
Jussi Pakkanen
Mike Sinkovsky
Hemmo Nieminen
Elliott Sales de Andrade