[Bug pch/54050] New: chaining

["wbrana at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54050

             Bug #: 54050
           Summary: chaining
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: pch
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wbrana@gmail.com


GCC could support chaining of pch, which is supported by clang:

http://clang.llvm.org/docs/PCHInternals.html

Precompiled headers can be chained. When you create a PCH while including an
existing PCH, Clang can create the new PCH by referencing the original file and
only writing the new data to the new file. For example, you could create a PCH
out of all the headers that are very commonly used throughout your project, and
then create a PCH for every single source file in the project that includes the
code that is specific to that file, so that recompiling the file itself is very
fast, without duplicating the data from the common headers for every file.