Simplify CM_FALLTHROUGH implementation

Use the macro now provided by KWSys instead of using `try_compile`
checks.  It will no longer consider the `__attribute__((fallthrough))`
variant, but compilers that don't have one of the modern attributes
shouldn't warn about not using one anyway.

1 files changed, 0 insertions, 11 deletions

diff --git a/Source/Checks/cm_cxx_gnu_fallthrough.cxx b/Source/Checks/cm_cxx_gnu_fallthrough.cxx
deleted file mode 100644
index ebc15f4..0000000
--- a/Source/Checks/cm_cxx_gnu_fallthrough.cxx
+++ /dev/null
@@ -1,11 +0,0 @@
-int main(int argc, char* [])
-{
-  int i = 3;
-  switch (argc) {
-    case 1:
-      i = 0;
-      [[gnu::fallthrough]];
-    default:
-      return i;
-  }
-}