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Diffstat (limited to 'Tests/Tutorial/Step10/directions.txt')
| -rw-r--r-- | Tests/Tutorial/Step10/directions.txt | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/Tests/Tutorial/Step10/directions.txt b/Tests/Tutorial/Step10/directions.txt deleted file mode 100644 index 5317b54..0000000 --- a/Tests/Tutorial/Step10/directions.txt +++ /dev/null @@ -1,38 +0,0 @@ -# Adding Generator Expressions # - -Generator expressions are evaluated during build system generation to produce -information specific to each build configuration. - -Generator expressions are allowed in the context of many target properties, such -as LINK_LIBRARIES, INCLUDE_DIRECTORIES, COMPILE_DEFINITIONS and others. 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 may to used to enable conditional linking, conditional -definitions used when compiling, and conditional include directories and more. -The conditions may be based on the build configuration, target properties, -platform information or any other queryable information. - -There are different types of generator expressions including Logical, -Informational, and Output expressions. - -Logical expressions are used to create conditional output. The basic expressions -are the 0 and 1 expressions. A "$<0:...>" results in the empty string, and -"$<1:...>" results in the content of "...". They can also be nested. -For example: - - if(HAVE_LOG AND HAVE_EXP) - target_compile_definitions(SqrtLibrary - PRIVATE "HAVE_LOG" "HAVE_EXP") - endif() - -Can be rewritten with generator expressions: - - target_compile_definitions(SqrtLibrary PRIVATE - "$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" - "$<$<BOOL:${HAVE_EXP}>:HAVE_EXP>" - ) - -Note that "${HAVE_LOG}" is evaluated at CMake configure time while -"$<$<BOOL:${HAVE_LOG}>:HAVE_LOG>" is evaluated at build system generation time. |