[LLVMbugs] [Bug 16822] New: Implement a minimal rebuild option

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16822

            Bug ID: 16822
           Summary: Implement a minimal rebuild option
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ehsan at mozilla.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The Microsoft compiler supports this:
<http://msdn.microsoft.com/en-us/library/vstudio/kfz8ad09.aspx>.

I think this basically comes down to the compiler keeping track of where each
name in the preprocessing and semantic analysis phase is coming from (which
clang currently does), and using that information to decide whether a change in
a header file is going to change the declaration/definition of any of those
names and skip generating a new object file if that's not the case.

Does this make sense to implement in clang?

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