Stephan Bergmann
e261881452
...at least from "g++ (GCC) 5.1.1 20150618 (Red Hat 5.1.1-4)" with
--disable-debug, when a namespace-scope const variable with a "complex"
initializer declared in an include file remains unused.
Avoid that warning via SAL_CONSTEXPR, which in turn requires large parts of
o3tl::is_typed_flags to be SAL_CONSTEXPR, which in turn requires a new
HAVE_CXX14_CONSTEXPR to allow assert in constexpr functions, which in turn
requires using -std=c++14 instead of -std=c++11 where available, which in turn
(a) requires to /not/ use -std=c++14 if it would run into a bug between Clang
and libstdc++ discussed at <https://llvm.org/bugs/show_bug.cgi?id=24115>
"llvm-nm fails to build with gcc 5.1's libstdc++" (and which hits us in
sfx2/source/control/thumbnailview.cxx), and (b) requires a new
HAVE_CXX14_SIZED_DEALLOCATION to work around GCC 5.1 -Werror=sized-deallocation
(where Clang >= 3.7 only supports C++14 sized deallocation when explictly
enabled via -fsized-deallocation, btw).
This effectively reverts ff6462e630 "avoid unused
variable warning:" again.
Change-Id: I424e3561452a3e6d8c8a9604d6c737cab49840c4
Reviewed-on: https://gerrit.libreoffice.org/18918
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>
These are configuration files for various features as detected by configure.
Include only those files you need (in order to reduce rebuilds when a setting changes).
Settings here are only C/C++ #define directives, so they apply only to C/C++ source,
not to Makefiles.
Adding a new setting:
=====================
- do AC_DEFINE(HAVE_FOO) in configure.ac when a setting should be set
- choose the proper config_host/config_XXX.h file to use
- if it is a global setting (such as availability of a compiler feature),
use config_host/config_global.h
- otherwise check if there is a matching config_host/config_XXX.h file
- if none matches, add a new one:
- add config_host/config_XXX.h.in here, with just #ifndef include guard
- add AC_CONFIG_HEADERS([config_host/config_XXX.h]) next to the others
in configure.ac
- add #define HAVE_FOO 0 to the config_host/config_XXX.h , possibly with a comment
(do not use #undef HAVE_FOO, unless the setting has more values than on/off)
- add #include <config_XXX.h> before any #if HAVE_FOO in a source file
- make sure you use #if HAVE_FOO for on/off settings, do not use #ifdef