[LLVMbugs] [Bug 433] NEW: Avoid running tablegen if not necessary

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=433

           Summary: Avoid running tablegen if not necessary
           Product: Build scripts
           Version: cvs
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Makefiles
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rspencer at x10sys.com


The rules for tablegen cause it to be run everytime you do a make. This causes
all Targets to rebuild at least their code emitter portions and slows down every
top level build. We need to fix the rules so that tablegen only runs if the *.td
files are newer than the code they generate.

I could whine about automake here, but I won't :)



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