Calling clang_reparseTranslationUnit does not make use of Precompiled Preamble flag

Clang Frontend
#1

Hello,

Under Windows (MinGW/G++ 4.6.1, Windows 7) the
CXTranslationUnit_*PrecompiledPreamble flag has no effect whatsoever
when calling clang_reparseTranslationUnit

It seems (after alot of struggling compiling clang under Windows /
MinGW...) that the problem is related to the CXUnsavedFile.

If I call:

clang_reparseTranslationUnit(TU, 1, &unsavedFile,
clang_defaultReparseOptions(TU)); ==> clangs does not precompile the
preamble

But if I will call it like this:
clang_reparseTranslationUnit(TU, 0, NULL,
clang_defaultReparseOptions(TU)); ==> clang precompiles the preamble

I observed this behavior while debugging it / set LIBCLANG_TIMING=1
In both clang 2.9 (official precompiled binaries) and in clang.dll
built from SVN trunk.

Also worth mentioning that under Linux, in both cases libclang is
precompiling the preamble

Is this behavior intentional? or is it a bug?

#2

Hello,

Under Windows (MinGW/G++ 4.6.1, Windows 7) the
CXTranslationUnit_*PrecompiledPreamble flag has no effect whatsoever
when calling clang_reparseTranslationUnit

It seems (after alot of struggling compiling clang under Windows /
MinGW...) that the problem is related to the CXUnsavedFile.

If I call:

clang_reparseTranslationUnit(TU, 1, &unsavedFile,
clang_defaultReparseOptions(TU)); ==> clangs does not precompile the
preamble

If you do subsequent clang_reparseTranslationUnits, is the preamble getting compiled or is it not compiled at all ?
Are you sure there's no error when parsing under windows ?

-Argyrios