[PATCH] D44568: Fix emission of phony dependency targets when adding extra deps

[David Stenberg via Phabricator via cfe-commits]

dstenb created this revision.
dstenb added reviewers: rsmith, pcc, krasin.
Herald added a subscriber: cfe-commits.

This commit fixes a bug where passing extra dependency entries
(using -fdepfile-entry) would result in -MP incorrectly emitting
a phony target for the input file, and no phony target for the
first extra dependency.

      

The extra dependencies are added first to the filename vector in
DFGImpl. That clashed with the emission of the phony targets, as
the code assumed that the first index always correspond to the
input file.


Repository:
  rC Clang

https://reviews.llvm.org/D44568

Files:
  lib/Frontend/DependencyFile.cpp
  test/Frontend/dependency-gen-extradeps-phony.c


Index: test/Frontend/dependency-gen-extradeps-phony.c
===================================================================
--- /dev/null
+++ test/Frontend/dependency-gen-extradeps-phony.c
@@ -0,0 +1,11 @@
+// RUN: %clang -MM -MP -Xclang -fdepfile-entry=1.extra -Xclang -fdepfile-entry=2.extra %s | FileCheck %s
+//
+// Verify that phony targets are only created for the extra dependency files,
+// and not the input file.
+
+// CHECK: dependency-gen-extradeps-phony.o: 1.extra 2.extra
+// CHECK-NOT: .c:
+// CHECK: 1.extra:
+// CHECK-NOT: .c:
+// CHECK: 2.extra:
+// CHECK-NOT: .c:
Index: lib/Frontend/DependencyFile.cpp
===================================================================
--- lib/Frontend/DependencyFile.cpp
+++ lib/Frontend/DependencyFile.cpp
@@ -162,6 +162,7 @@
   bool SeenMissingHeader;
   bool IncludeModuleFiles;
   DependencyOutputFormat OutputFormat;
+  unsigned InputFileIndex;
 
 private:
   bool FileMatchesDepCriteria(const char *Filename,
@@ -176,9 +177,11 @@
       AddMissingHeaderDeps(Opts.AddMissingHeaderDeps),
       SeenMissingHeader(false),
       IncludeModuleFiles(Opts.IncludeModuleFiles),
-      OutputFormat(Opts.OutputFormat) {
+      OutputFormat(Opts.OutputFormat),
+      InputFileIndex(0) {
     for (const auto &ExtraDep : Opts.ExtraDeps) {
       AddFilename(ExtraDep);
+      ++InputFileIndex;
     }
   }
 
@@ -446,8 +449,10 @@
 
   // Create phony targets if requested.
   if (PhonyTarget && !Files.empty()) {
-    // Skip the first entry, this is always the input file itself.
-    for (auto I = Files.begin() + 1, E = Files.end(); I != E; ++I) {
+    unsigned Index = 0;
+    for (auto I = Files.begin(), E = Files.end(); I != E; ++I) {
+      if (Index++ == InputFileIndex)
+        continue;
       OS << '\n';
       PrintFilename(OS, *I, OutputFormat);
       OS << ":\n";


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