[LLVMbugs] [Bug 6519] New: Support -Xarch_arch option on Darwin

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6519

           Summary: Support -Xarch_arch option on Darwin
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: dgregor at apple.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 5881


Darwin's GCC has a funny scheme where we can pass architecture-specific flags
with, e.g.,

  -Xarch_i386 -mmacosx-version-min=10.4

so that -mmacosx-version-min=10.4 will only be passed down the command-line
chain for -arch i386.

Qt uses this.

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