[PATCH] D88144: [clangd] Disable suffix matching fallback for C during include insertion

[Kadir Cetinkaya via Phabricator via cfe-commits]

kadircet created this revision.
kadircet added a reviewer: sammccall.
Herald added subscribers: cfe-commits, usaxena95, arphaman.
Herald added a project: clang.
kadircet requested review of this revision.
Herald added subscribers: MaskRay, ilya-biryukov.

Clangd currently doesn't respect language and breaks the builds with
include insertion for C. This patch aims to stop the bleeding by not mapping
back to CPP standard library headers.

Improves https://github.com/clangd/clangd/issues/376.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88144

Files:
  clang-tools-extra/clangd/index/CanonicalIncludes.cpp
  clang-tools-extra/clangd/unittests/CanonicalIncludesTests.cpp


Index: clang-tools-extra/clangd/unittests/CanonicalIncludesTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/CanonicalIncludesTests.cpp
+++ clang-tools-extra/clangd/unittests/CanonicalIncludesTests.cpp
@@ -21,6 +21,10 @@
   CI.addSystemHeadersMapping(Language);
   // Usual standard library symbols are mapped correctly.
   EXPECT_EQ("<stdio.h>", CI.mapHeader("path/stdio.h", "printf"));
+  // Suffix mapping isn't available for C, instead of mapping to `<cstdio> we
+  // just leave the header as-is.
+  EXPECT_EQ("include/stdio.h",
+            CI.mapHeader("include/stdio.h", "unknown_symbol"));
 }
 
 TEST(CanonicalIncludesTest, CXXStandardLibrary) {
Index: clang-tools-extra/clangd/index/CanonicalIncludes.cpp
===================================================================
--- clang-tools-extra/clangd/index/CanonicalIncludes.cpp
+++ clang-tools-extra/clangd/index/CanonicalIncludes.cpp
@@ -772,7 +772,10 @@
                   MaxSuffixComponents;
          }) != SystemHeaderMap->keys().end());
 
-  StdSuffixHeaderMapping = SystemHeaderMap;
+  // FIXME: Suffix mapping contains invalid entries for C, so only enable it for
+  // CPP.
+  if (Language.CPlusPlus)
+    StdSuffixHeaderMapping = SystemHeaderMap;
 }
 
 } // namespace clangd


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