[llvm-bugs] [Bug 34112] New: Clang 4.0.0 searches for system headers before headers in the source tree

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34112

            Bug ID: 34112
           Summary: Clang 4.0.0 searches for system headers before headers
                    in the source tree
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: doctorwhoguy at gmail.com
                CC: llvm-bugs at lists.llvm.org

Clang apparently searches for needed headers installed on the system before
headers that are included in the source tree of software being compiled, at
least when compiling bundled libraries. I have encountered this twice so far,
with the games Smokin Guns and eduke32. For example, Smokin Guns bundles the
source for the speex library, and when compiling the bundled speex library, it
finds and uses /usr/local/include/speex/speex_bits.h instead of
SmokinGuns-1.1/code/libspeex/include/speex/speex_bits.h Obviously if the
bundled and system libraries are the same, it compiles fine, but if the bundled
and system versions don't match, this results in a compilation error. The
correct behavior would surely be for Clang to look in the source tree first for
needed headers.

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