[LLVMbugs] [Bug 16194] New: gcc compilation option -no-integrated-cpp unsupported

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16194

            Bug ID: 16194
           Summary: gcc compilation option -no-integrated-cpp unsupported
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pabuhr at uwaterloo.ca
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I created the -no-integrated-cpp gcc command-line option to support insertion
of additional preprocessing phases after cpp. I use this feature in an
extension to C++ called uC++, http://plg.uwaterloo.ca/~usystem/uC++.html, which
adds advanced concurrency features to C++ (more features than the current
C++11).

clang does not support the gcc -no-integrated-cpp option, and it would be
really nice to have both gcc and clang able to compile uC++. I don't know if
the structure of clang would allow the -no-integrated-cpp option, but I thought
I'd ask. ... I just noticed there has been a request for the -B flag and it is
marked as "wontfix", and -B is needed to add additional preprocessors. It might
be possible to allow multiple preprocessors without the entire mechanism of -B.

In case you believe it is possible to preprocessor before calling clang, let me
say it is a nightmare to do it that way, and involves multiple calls to cpp.
So I've already seriously investigated this approach and abandoned it a long
time ago, which is why the -no-integrated-cpp command-line option exists.

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