Introduce the notion of "Relocatable" precompiled headers, which are built

with a particular system root directory and can be used with a different
system root directory when the headers it depends on have been installed.
Relocatable precompiled headers rewrite the file names of the headers used
when generating the PCH file into the corresponding file names of the 
headers available when using the PCH file.

Addresses <rdar://problem/7001604>.

llvm-svn: 74885

2 files changed, 30 insertions, 0 deletions

diff --git a/clang/test/PCH/libroot/usr/include/reloc.h b/clang/test/PCH/libroot/usr/include/reloc.h
new file mode 100644
index 00000000000..04eeacba8ff
--- /dev/null
+++ b/clang/test/PCH/libroot/usr/include/reloc.h
@@ -0,0 +1,15 @@
+#ifndef RELOC_H
+#define RELOC_H
+
+#include <reloc2.h>
+
+
+
+
+
+
+
+// Line number 13 below is important
+int x = 2;
+
+#endif // RELOC_H
diff --git a/clang/test/PCH/libroot/usr/include/reloc2.h b/clang/test/PCH/libroot/usr/include/reloc2.h
new file mode 100644
index 00000000000..995415ce95b
--- /dev/null
+++ b/clang/test/PCH/libroot/usr/include/reloc2.h
@@ -0,0 +1,15 @@
+#ifndef RELOC2_H
+#define RELOC2_H
+#include <stddef.h>
+
+
+
+
+
+
+
+
+
+// Line number below is important!
+int y = 2;
+#endif // RELOC2_H