From 3c47ac5b2571939f7d987d9f23a9969b1f67f46e Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 18 Apr 2018 08:04:55 -0400
Subject: OpenWatcom: Add workaround for lack of error on missing library

The OpenWatcom tools do not fail to link when a library is missing if no
symbols were needed from it.  This can break `try_compile` checks.
Teach `cmGlobalGenerator::Build` to pretend that the build tool returned
non-zero if the output contains the corresponding warning.
---
 Source/cmGlobalGenerator.cxx | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index f9eb90f..cf277d5 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1893,6 +1893,13 @@ int cmGlobalGenerator::Build(const std::string& /*unused*/,
     retVal = 1;
   }
 
+  // The OpenWatcom tools do not return an error code when a link
+  // library is not found!
+  if (this->CMakeInstance->GetState()->UseWatcomWMake() && retVal == 0 &&
+      output.find("W1008: cannot open") != std::string::npos) {
+    retVal = 1;
+  }
+
   return retVal;
 }
 
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