Add options to run `ldd -u -r` as a "link-what-you-use" tool

Create a LINK_WHAT_YOU_USE target property and corresponding
CMAKE_LINK_WHAT_YOU_USE variable to enable this behavior.
Extend link commands by running `ldd -u -r` to detect shared
libraries that are linked but not needed.

1 files changed, 4 insertions, 0 deletions

diff --git a/Tests/RunCMake/LinkWhatYouUse/main.c b/Tests/RunCMake/LinkWhatYouUse/main.c
new file mode 100644
index 0000000..8488f4e
--- /dev/null
+++ b/Tests/RunCMake/LinkWhatYouUse/main.c
@@ -0,0 +1,4 @@
+int main(void)
+{
+  return 0;
+}