[libclang] Allow skipping warnings from all included files

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 * https://reviews.llvm.org/D48116
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Depending on the included files and the used warning flags, e.g. -
Weverything, a huge number of warnings can be reported for included
files. As processing that many diagnostics comes with a performance
impact and not all clients are interested in those diagnostics, add a
flag to skip them.
This is a cherry pick from commit cc84b351940f2aa9177d0cb83e827be06f219d8f

Change-Id: Ia738a9382b43d210046bff68b3be8cb9dd89206f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

1 files changed, 12 insertions, 1 deletions

diff --git a/include/clang-c/Index.h b/include/clang-c/Index.h
index 65dada38b0..0dce9f2f27 100644
--- a/include/clang-c/Index.h
+++ b/include/clang-c/Index.h
@@ -33,6 +33,7 @@
  */
 #define CINDEX_VERSION_MAJOR 0
 #define CINDEX_VERSION_MINOR 49
+#define CINDEX_VERSION_HAS_SKIPWARNINGSFROMINCLUDEDFILES_BACKPORTED
 
 #define CINDEX_VERSION_ENCODE(major, minor) ( \
       ((major) * 10000)                       \
@@ -1332,7 +1333,17 @@ enum CXTranslationUnit_Flags {
    *
    * The function bodies of the main file are not skipped.
    */
-  CXTranslationUnit_LimitSkipFunctionBodiesToPreamble = 0x800
+  CXTranslationUnit_LimitSkipFunctionBodiesToPreamble = 0x800,
+
+  /**
+   * Used to indicate that non-errors from included files should be ignored.
+   *
+   * If set, clang_getDiagnosticSetFromTU() will not report e.g. warnings from
+   * included files anymore. This speeds up clang_getDiagnosticSetFromTU() for
+   * the case where these warnings are not of interest, as for an IDE for
+   * example, which typically shows only the diagnostics in the main file.
+   */
+  CXTranslationUnit_IgnoreNonErrorsFromIncludedFiles = 0x1000
 };
 
 /**