Clang baseline bump
sbergman at redhat.com
Thu Dec 14 08:33:36 UTC 2017
Current master README.md has the following on which Clang versions are
> * Linux:
> * Runtime: RHEL 6 or CentOS 6
> * Build: GCC 4.8.1 or Clang
> If you want to use Clang with the LibreOffice compiler plugins, the minimal
> version of Clang is 3.4. Since Xcode doesn't provide the compiler plugin
> headers, you have to compile your own Clang to use them on macOS.
However, I found that:
* Clang 3.4.2 no longer passes our configure checks, at least since
"Build as C++17 when GCC/Clang supports it" (which added a
#pragma GCC diagnostic ignored "-Wpragmas"
that Clang 3.4 complains about, and which would need a preceding
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
to silence the Clang 3.4 warning, like is done in
bin/gen-boost-headers). Clang 3.5.0 passes the configure checks.
* Clang older than 3.8.0 (tested: 3.4.2, 3.5.0, 3.6.0, 3.7.0) fail `make
comilerplugins`, for varying reasons. Our plugin code uses LLVM/Clang
functionality that was not available (or was available in different
form) back then.
If there are no objections, I will do the following changes on master:
* note in README.md that Clang < 3.5 is known not to work to compile LO
on Linux; and
* make the relevant changes so that --enable-compiler-plugins requires
at least Clang 3.8.0.
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