Commit Graph

5 Commits

Author SHA1 Message Date
Stephen Kelly 60a981ea8e Features: Enable compiler extensions by default.
Compilers enable their extensions by default, and disabling them
implicitly can lead to results which are surprising or non-obvious
to debug.

 http://public.kitware.com/pipermail/cmake-developers/2014-May/010575.html
 http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/10214
 https://www.mail-archive.com/cmake-developers@cmake.org/msg10116.html
 (Compiler feature extensions by default, 29 May 2014)
2014-05-31 12:16:12 +02:00
Stephen Kelly ca5d990f02 Help: Add a manual for compiler feature control.
Link to it from the documentation of related properties, variables
and commands.

Extend the cmake-developer(7) documentation with notes on
extending feature support for compilers.
2014-05-27 09:35:00 -04:00
Stephen Kelly 205215fb8a cmTarget: Add CXX_STANDARD_REQUIRED to control decay. 2014-05-07 12:17:49 +02:00
Stephen Kelly 1df2116bfa Features: Decay language flag if requested is not available.
Use the highest standard compile flags available if requested language
version is too new.

This supports use-cases like

 set(CMAKE_CXX_STANDARD 14)

 # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14
 # or equivalent flag
 add_executable(main main.cpp)

This can be used in combination with preprocessor defines which
communicate the availability of certain language features for
optional use.
2014-05-07 12:17:49 +02:00
Stephen Kelly 913394af24 cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties.
These are used to determine whether to add -std=c++11, -std=gnu++11
etc flags on the compile line.
2014-04-07 16:48:44 +02:00