Current master README.md has the following on which Clang versions are
supported:
* 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
<https://cgit.freedesktop.org/libreoffice/core/commit/?id=ae16870b2c84c116cde8279a47db106a4fa9d529>
"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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