[cfe-dev] PCH without original files

[Axel Naumann]

Hi,

Attached patch allows the ASTReader to use a PCH even if the original
files (which are store as absolute file names or relative to sysroot)
have been removed. Drawback: without these original files, diagnostics
referring to source locations in the original files cannot show the
source code:

$ cat test.h
void f(){}
$ cat test.cxx
int f(){}
$ clang -cc1 -x c++ -emit-pch test.h -o test.h.pch
$ clang -cc1 -include-pch test.h.pch -emit-obj test.cxx
test.cxx:1:5: error: functions that differ only in their return type
cannot be overloaded
int f(){}
    ^
/build/llvm/tmp/relopch/email/test.h:1:6: note: previous definition is here
void f(){}
     ^
1 error generated.
$ rm test.h
$ clang -cc1 -include-pch test.h.pch -emit-obj test.cxx
test.cxx:1:5: error: functions that differ only in their return type
cannot be overloaded
int f(){}
    ^
1 error generated.

make test is happy. Please let me know whether this is okay to commit.

As a next step, I want to implement header search in the ASTReader if
the relocatable flag is set, and if the original file cannot be found.

Cheers, Axel.
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