linkers: Fix detection of link arguments to Clang(-cl) + MSVC

Currently, not only Meson lacks a way to induce a "--fatal-warnings" on
LINK.exe, it is also unable to pass flags appropriately when using
clang-cl or Microsoft's stock clang.

This commit fixes it by implementing `fatal_warnings()` in the
MSVCDynamicLinker and ClangCLDynamicLinker classes, and by implementing
the requisite conversion steps in linker_to_compiler_args for
ClangCompiler.

1 files changed, 6 insertions, 0 deletions

diff --git a/mesonbuild/linkers/linkers.py b/mesonbuild/linkers/linkers.py
index e4db015..a807b7b 100644
--- a/mesonbuild/linkers/linkers.py
+++ b/mesonbuild/linkers/linkers.py
@@ -1313,6 +1313,9 @@ class MSVCDynamicLinker(VisualStudioLikeLinkerMixin, DynamicLinker):
     def get_win_subsystem_args(self, value: str) -> T.List[str]:
         return self._apply_prefix([f'/SUBSYSTEM:{value.upper()}'])
 
+    def fatal_warnings(self) -> T.List[str]:
+        return ['-WX']
+
 
 class ClangClDynamicLinker(VisualStudioLikeLinkerMixin, DynamicLinker):
 
@@ -1342,6 +1345,9 @@ class ClangClDynamicLinker(VisualStudioLikeLinkerMixin, DynamicLinker):
     def get_thinlto_cache_args(self, path: str) -> T.List[str]:
         return ["/lldltocache:" + path]
 
+    def fatal_warnings(self) -> T.List[str]:
+        return ['-WX']
+
 
 class XilinkDynamicLinker(VisualStudioLikeLinkerMixin, DynamicLinker):