Add method to check for C/C++ function attributes

It's fairly common on Linux and *BSD platforms to check for these
attributes existence, so it makes sense to me to have this checking
build into meson itself. Autotools also has a builtin for handling
these, and by building them in we can short circuit cases that we know
that these don't exist (MSVC).

Additionally this adds support for two common MSVC __declspec
attributes, dllimport and dllexport. This implements the declspec
version (even though GCC has an __attribute__ version that both it and
clang support), since GCC and Clang support the MSVC version as well.
Thus it seems reasonable to assume that most projects will use the
__declspec version over teh __attribute__ version.

1 files changed, 4 insertions, 0 deletions

diff --git a/mesonbuild/compilers/compilers.py b/mesonbuild/compilers/compilers.py
index 36507b0..88e9bce 100644
--- a/mesonbuild/compilers/compilers.py
+++ b/mesonbuild/compilers/compilers.py
@@ -1137,6 +1137,10 @@ class Compiler:
     def get_gui_app_args(self, value):
         return []
 
+    def has_func_attribute(self, name, env):
+        raise EnvironmentException(
+            'Language {} does not support function attributes.'.format(self.get_display_language()))
+
 GCC_STANDARD = 0
 GCC_OSX = 1
 GCC_MINGW = 2