commit 6896a371e302c63ce3d4a99ad2c32e42dde6a9e4
author Chris Lattner <sabre@nondot.org> Mon Jun 15 05:02:34 2009 +0000
committer Chris Lattner <sabre@nondot.org> Mon Jun 15 05:02:34 2009 +0000
tree 84f1540af63a0a39327b2160bb93d02f2628de97
parent a81aae2cb8bc839deea6d4a6e676e10c16c4f643

Fix #pragma GCC system_header by making it insert a virtual linemarker into
the file at the point of the pragma.  This allows clang to know that all
sourcelocations after the pragma are in a system header.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73376 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Lex/Pragma.cpp

diff --git a/lib/Lex/Pragma.cpp b/lib/Lex/Pragma.cpp
index ce59341..9776c2c 100644
--- a/lib/Lex/Pragma.cpp
+++ b/lib/Lex/Pragma.cpp
@@ -195,8 +195,10 @@
 
 void Preprocessor::HandlePragmaMark() {
   assert(CurPPLexer && "No current lexer?");
-  if (CurLexer) CurLexer->ReadToEndOfLine();
-  else CurPTHLexer->DiscardToEndOfLine();
+  if (CurLexer)
+    CurLexer->ReadToEndOfLine();
+  else
+    CurPTHLexer->DiscardToEndOfLine();
 }
 
 
@@ -254,6 +256,18 @@
   // Mark the file as a system header.
   HeaderInfo.MarkFileSystemHeader(TheLexer->getFileEntry());
   
+  
+  PresumedLoc PLoc = SourceMgr.getPresumedLoc(SysHeaderTok.getLocation());
+  unsigned FilenameLen = strlen(PLoc.getFilename());
+  unsigned FilenameID = SourceMgr.getLineTableFilenameID(PLoc.getFilename(),
+                                                         FilenameLen);
+  
+  // Emit a line marker.  This will change any source locations from this point
+  // forward to realize they are in a system header.
+  // Create a line note with this information.
+  SourceMgr.AddLineNote(SysHeaderTok.getLocation(), PLoc.getLine(), FilenameID,
+                        false, false, true, false);
+  
   // Notify the client, if desired, that we are in a new source file.
   if (Callbacks)
     Callbacks->FileChanged(SysHeaderTok.getLocation(),

test/Preprocessor/pragma_sysheader.c

diff --git a/test/Preprocessor/pragma_sysheader.c b/test/Preprocessor/pragma_sysheader.c
new file mode 100644
index 0000000..49082b8
--- /dev/null
+++ b/test/Preprocessor/pragma_sysheader.c
@@ -0,0 +1,3 @@
+// RUN: clang -verify -pedantic %s -fsyntax-only
+// rdar://6899937
+#include "pragma_sysheader.h"

test/Preprocessor/pragma_sysheader.h

diff --git a/test/Preprocessor/pragma_sysheader.h b/test/Preprocessor/pragma_sysheader.h
new file mode 100644
index 0000000..b79bde5
--- /dev/null
+++ b/test/Preprocessor/pragma_sysheader.h
@@ -0,0 +1,4 @@
+#pragma GCC system_header
+typedef int x;
+typedef int x;
+