compilers: Move get_allow_undefined_link_args to Compiler

This allows each implementation (gnu-like) and msvc to be implemented in
their respective classes rather than through an if tree in the CCompiler
class. This is cleaner abstraction and allows us to clean up the Fortran
compiler, which was calling CCompiler bound methods without an instance.

1 files changed, 14 insertions, 0 deletions

diff --git a/mesonbuild/compilers/compilers.py b/mesonbuild/compilers/compilers.py
index 3d53f27..f464ec8 100644
--- a/mesonbuild/compilers/compilers.py
+++ b/mesonbuild/compilers/compilers.py
@@ -1265,6 +1265,12 @@ class Compiler:
         raise EnvironmentException(
             '%s does not support get_profile_use_args ' % self.get_id())
 
+    def get_undefined_link_args(self):
+        '''
+        Get args for allowing undefined symbols when linking to a shared library
+        '''
+        return []
+
 
 @enum.unique
 class CompilerType(enum.Enum):
@@ -1511,6 +1517,14 @@ class GnuLikeCompiler(abc.ABC):
     def get_profile_use_args(self):
         return ['-fprofile-use', '-fprofile-correction']
 
+    def get_allow_undefined_link_args(self):
+        if self.compiler_type.is_osx_compiler:
+            # Apple ld
+            return ['-Wl,-undefined,dynamic_lookup']
+        else:
+            # GNU ld and LLVM lld
+            return ['-Wl,--allow-shlib-undefined']
+
 
 class GnuCompiler(GnuLikeCompiler):
     """