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, 6 insertions, 0 deletions

diff --git a/mesonbuild/compilers/cpp.py b/mesonbuild/compilers/cpp.py
index 85766f7..2173655 100644
--- a/mesonbuild/compilers/cpp.py
+++ b/mesonbuild/compilers/cpp.py
@@ -31,8 +31,14 @@ from .compilers import (
     ArmCompiler,
     ArmclangCompiler,
 )
+from .c_function_attributes import CXX_FUNC_ATTRIBUTES
 
 class CPPCompiler(CCompiler):
+
+    @classmethod
+    def attribute_check_func(cls, name):
+        return CXX_FUNC_ATTRIBUTES.get(name, super().attribute_check_func(name))
+
     def __init__(self, exelist, version, is_cross, exe_wrap, **kwargs):
         # If a child ObjCPP class has already set it, don't set it ourselves
         if not hasattr(self, 'language'):