[LLVMbugs] [Bug 18672] New: LLVM build system should use -isystem instead of -I for including LLVM headers

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18672

            Bug ID: 18672
           Summary: LLVM build system should use -isystem instead of -I
                    for including LLVM headers
           Product: Build scripts
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Makefiles
          Assignee: unassignedbugs at nondot.org
          Reporter: eteran at alum.rit.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I like to compile with as many warnings as I find reasonable enabled.
Unfortunately, the LLVM build system uses "-I" to include the LLVM headers, so
code in them can also trigger warnings.

It would be great if there was an option (perhaps on by default) to use
"-isystem" when supported by the compiler. I *think* both clang and gcc support
this flag and will suppress warnings triggered by headers found in that path.

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