[LLVMbugs] [Bug 20865] New: autoconf unconditionally defines _GNU_SOURCE

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20865

            Bug ID: 20865
           Summary: autoconf unconditionally defines _GNU_SOURCE
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: OpenBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: autoconf
          Assignee: unassignedbugs at nondot.org
          Reporter: jsg at openbsd.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When built via autoconf LLVM unconditionally defines _GNU_SOURCE, this is not
the case when built via cmake.  When built via cmake LLVM first checks if the
host is using glibc before adding the define.

This becomes a problem when llvm-config --cflags includes _GNU_SOURCE and
projects like Mesa assume _GNU_SOURCE means the system is using glibc.

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