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This specifies the use of different link libraries based on both the compiler id and link language. This expression may be used to specify link libraries, link options, link directories and link dependencies of a particular language and linker combination in a target. This expression is a short form for the combination of $ and $. Target_link_libraries(myapp myapp_c myapp_cxx) $ġ when the language used for link step matches language and the CMake's compiler id of the language linker matches any one of the entries in compiler_ids, otherwise 0. Target_compile_options(myapp_cxx PUBLIC -fno-exceptions) A workaround is to create separate libraries for each source file language instead: add_library(myapp_c foo.c) Under these generators, expressions for both C and C++ sources will be evaluated using CXX if there are any C++ sources and otherwise using C. Also, with Visual Studio Generators there is no way to represent target-wide flags separately for C and CXX languages. Note that with Visual Studio Generators and Xcode there is no way to represent target-wide compile definitions or include directories separately for C and CXX languages. It also specifies a COMPILING_CUDA compile definition for CUDA. This specifies the use of the -fno-exceptions compile option, COMPILING_CXX compile definition, and cxx_headers include directory for C++ only (compiler id checks elided). For example: add_executable(myapp main.cpp foo.c bar.cpp zot.cu) This expression may be used to specify compile options, compile definitions, and include directories for source files of a particular language in a target.
#Cmake generator generator
Without the COMPILE_LANG_AND_ID generator expression the same logic would be expressed as: target_compile_definitions(myappġ when the language used for compilation unit matches any of the entries in languages, otherwise 0. Likewise when the C compiler is Clang it will only see the COMPILING_C_WITH_CLANG definition. This example will have a COMPILING_CXX_WITH_CLANG compile definition when Clang is the CXX compiler, and COMPILING_CXX_WITH_INTEL when Intel is the CXX compiler. This specifies the use of different compile definitions based on both the compiler id and compilation language. This expression may be used to specify compile options, compile definitions, and include directories for source files of a particular language and compiler combination in a target.
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$ġ when the language used for compilation unit matches language and the CMake's compiler id of the language compiler matches any one of the entries in compiler_ids, otherwise 0. $ 1 if value1 and value2 are numerically equal, else 0. For a case-insensitive comparison, combine with a string transforming generator expression, $,"BAR"> # "1" if $ is any of "BAR", "Bar", "bar". String Comparisons $ġ if string1 and string2 are equal, else 0. Evaluates to 1 if at least one of the conditions is 1. $ where conditions is a comma-separated list of boolean expressions. string ends in the suffix -NOTFOUND (case-sensitive).string is a case-insensitive equal of 0, FALSE, OFF, N, NO, IGNORE, or NOTFOUND, or.Evaluates to 0 if any of the following is true: They are typically used to construct the condition in a conditional generator expression.Ĭonverts string to 0 or 1. Generator expressions can be nested, as shown in most of the examples below.īoolean expressions evaluate to either 0 or 1. To avoid confusion, this page deviates from most of the CMake documentation in that it omits angular brackets around placeholders like condition, string, target, among others. The conditions may be based on the build configuration, target properties, platform information or any other queryable information. They enable conditional linking, conditional definitions used when compiling, conditional include directories, and more.
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They may also be used when using commands to populate those properties, such as target_link_libraries(), target_include_directories(), target_compile_definitions() and others. Generator expressions are allowed in the context of many target properties, such as LINK_LIBRARIES, INCLUDE_DIRECTORIES, COMPILE_DEFINITIONS and others. Generator expressions are evaluated during build system generation to produce information specific to each build configuration. 1.3 String-Valued Generator Expressions.