has_function() tries to link an example program using the function
to see if it is available, but with clang on 64bit Windows this
example always already failed at the compile step:
error: cast from pointer to smaller type 'long' loses information
long b = (long) a;
This is due to long!=pointer with LLP64
Change from "long" to "long long" which is min 64bit and should always
fit a pointer. While "long long" is strictly a C99 feature every
non super ancient compiler should still support it.
The builtin check had a special case that if a header was provided and
the function wasn't defined, it would ignore the builtin to avoid
non-functional builtins (for example __builtin_posix_memalign in MSYS2).
GCC 10 gained support for __has_builtin() which now skipps this check
and because __has_builtin(__builtin_posix_memalign) returns true the
non functional builtin is now reported as available.
To get the old behaviour back move the special case in front of the actual
availability check.
Fixes#7113
If no exe_wrapper is set in the meson cross file the exe_wrapper
object will be an instance of EmptyExternalProgram.
So, found is True and prorgram is an empty list.
This will cause meson to tun the compiler sanity check because
it checks only for self.is_cross and self.exe_wrapper being
not None.
I ran into that situation while cross compiling for ia32 on a
x64_64 host. The host had no ia32 userspace installed, so the
self test failed.
As workaround I currently set exe_wrapper to 'true'.
Signed-off-by: Richard Weinberger <richard@nod.at>
Error example:
Code:
#include <locale.h>
int main () {
/* If it's not defined as a macro, try to use as a symbol */
#ifndef LC_MESSAGES
LC_MESSAGES;
#endif
}
Compiler stdout:
Compiler stderr:
In file included from /usr/include/locale.h:25,
from /tmp/tmpep_i4iwg/testfile.c:2:
/usr/include/features.h:382:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
382 | # warning _FORTIFY_SOURCE requires compiling with optimization (-O)
| ^~~~~~~
/tmp/tmpep_i4iwg/testfile.c: In function 'main':
/tmp/tmpep_i4iwg/testfile.c:8:9: error: control reaches end of non-void function [-Werror=return-type]
8 | }
| ^
cc1: some warnings being treated as errors
There is a pretty big error in here, trying to return a tuple
comperhension: (a for a in []) is not a tuple, it's a generator. This
has profound type annotations: generators don't support most tuple or
list methods, and they can only be iterated once. Beyond that tuples are
meant for heterogenous types, ie, position matters for types. I've
converted the output to a list in all cases.
The compilers module is rather large and confusing, with spaghetti
dependencies going every which way. I'm planning to start breaking out
the internal representations into a mixins submodule, for things that
shouldn't be required outside of the compilers module itself.
Ole André Vadla Ravnås