From f395caf49845dc233c31dd92eaaacaa4f16a1241 Mon Sep 17 00:00:00 2001
From: Marc Chevrier <marc.chevrier@gmail.com>
Date: Wed, 2 Dec 2020 12:29:31 +0100
Subject: Makefiles dependencies: enhance robustness of deps parser

---
 Source/cmDependsCompiler.cxx | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Source/cmDependsCompiler.cxx b/Source/cmDependsCompiler.cxx
index eb0f1d5..0f695c8 100644
--- a/Source/cmDependsCompiler.cxx
+++ b/Source/cmDependsCompiler.cxx
@@ -182,6 +182,11 @@ bool cmDependsCompiler::CheckDependencies(
           ParseLine(line, depends);
         }
 
+        if (depends.empty()) {
+          // unexpectedly empty, ignore it and continue
+          continue;
+        }
+
         // depending of the effective format of the dependencies file generated
         // by the compiler, the target can be wrongly identified as a
         // dependency so remove it from the list
@@ -189,7 +194,13 @@ bool cmDependsCompiler::CheckDependencies(
           depends.erase(depends.begin());
         }
 
-        if (isValidPath) {
+        // ensure source file is the first dependency
+        if (depends.front() != source) {
+          cm::erase(depends, source);
+          if (!isValidPath) {
+            depends.insert(depends.begin(), source);
+          }
+        } else if (isValidPath) {
           // remove first dependency because it must not be filtered out
           depends.erase(depends.begin());
         }
-- 
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