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Cmake set variable if not set12/17/2023 Is far easier to know and limit the impact of implementation dependencies whenĪ program is written than to try to untangle the mess afterwards. Your favorite compiler may do some things differently from the current one. In addition, programs often need to beĬompiled with other compilers for the same system, and even a future release of Likely to be ported, so someone will have to find and fix problems related to Portability usually do so because they use only a single system and feel theyĬan afford the attitude that ââthe language is what my compiler implements.ââ Variety of compilers care a lot because if they donât, they are forced to waste Why should you bother? People who program on a variety of systems or use a Some quote from a nice book of a nice guy you probably know (emphasis mine): Would it be possible to add a new CMake policy to make it so that calling set() will create and/or reset a local variable .Thank you! :) You save a day for one programmer. target_compile_definitions(MyTarget PUBLIC "$:MYDEBUG_MACRO>") Set(CMAKE_CXX_FLAGS_DEBUG "$ -my-debug-flags") Set(CMAKE_BUILD_TYPE Release CACHE STRING "") Is there a way to achieve this? Thank you.ĬMakeLists.txt cmake_minimum_required(VERSION 3.10) I tried using FORCE and also tried adding unset(CMAKE_BUILD_TYPE CACHE)Ä«efore the set(), but both these methods fix the value to Release and override the value specified by the user. However, this caches the build type from the last build, so if the last build was Debug, I need to explicitly specify Release in the next build. Referring to this and this, to allow the build type to be specified from the command line, I have set the variable as follows: set(CMAKE_BUILD_TYPE Release CACHE STRING "") I would like the build configuration in CMakeLists.txt to be such that it builds in Release mode by default, and builds in Debug mode only when explicitly specified. The same applies to boolean variables stored in CMakes cache. I have a C++ project that is built using CMake. This makes some things confusing for example, one could use the option command to get an input from the user in the configuration phase, and then try to use its value within a generator expression however, in this case, cmake would complain if the value is not 1 or 0.
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