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CMake: Difference between revisions
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If <tt>CMAKE_BUILD_TYPE</tt> is not provided, none of these is used -- no debugging flags are set, and no optimization flags are set, in a somewhat stunning bit of unexpected behavior. The following snippet will ensure a default of RelWithDebInfo, and allow the value to be selected from a set in the gui: | If <tt>CMAKE_BUILD_TYPE</tt> is not provided, none of these is used -- no debugging flags are set, and no optimization flags are set, in a somewhat stunning bit of unexpected behavior. The following snippet will ensure a default of RelWithDebInfo, and allow the value to be selected from a set in the gui: | ||
<pre> | <pre> | ||
set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS | set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo") | ||
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES) | if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES) | ||
set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose build mode." FORCE) | set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose build mode." FORCE) | ||
Revision as of 09:00, 6 May 2020
CMake is one of the numerous build systems that seeks to replace Autotools+Make in the twenty-first century.
A CMake build can be configured on the command line with -D switches, or using ccmake/cmake-gui. Either way, the result is build infrastructure for some other tool, such as Make or Ninja.
Build Types
CMAKE_BUILD_TYPE can take any of the values in CMAKE_CONFIGURATION_TYPES. Important ones include:
- Debug -- no optimization, full debug info, assert (NDEBUG is not defined)
- RelWithDebInfo -- optimized, symbols
- Release -- optimized, no symbols
- MinSizeRel -- optimized for size
If CMAKE_BUILD_TYPE is not provided, none of these is used -- no debugging flags are set, and no optimization flags are set, in a somewhat stunning bit of unexpected behavior. The following snippet will ensure a default of RelWithDebInfo, and allow the value to be selected from a set in the gui:
set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose build mode." FORCE)
endif()
message(STATUS "Requested build mode: ${CMAKE_BUILD_TYPE}")
