Swift_COMPILATION_MODEΒΆ
Added in version 3.29.
Specify how Swift compiles a target.
The allowed values are:
incrementalCompiles each Swift source in the module separately, resulting in better parallelism in the build. The compiler emits additional information into the build directory improving rebuild performance when small changes are made to the source between rebuilds. This is the best option to use while iterating on changes in a project.
wholemoduleWhole-module optimizations are slowest to compile, but results in the most optimized library. The entire context is loaded into once instance of the compiler, so there is no parallelism across source files in the module.
singlefileCompiles each source in a Swift modules separately, resulting in better parallelism. Unlike the
incrementalbuild mode, no additional information is emitted by the compiler during the build, so rebuilding after making small changes to the source file will not run faster. This option should be used sparingly, preferringincrementalbuilds, unless working around a compiler bug.
Use generator expressions to support
per-configuration specification. For example, the code:
add_library(foo foo.swift)
set_property(TARGET foo PROPERTY
Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
sets the Swift compilation mode to wholemodule mode in the release configuration and sets the property to incremental mode in other configurations.
The property is initialized from the value of the
CMAKE_Swift_COMPILATION_MODE variable, if it is set. If the property
is not set or is empty, then CMake uses the default value incremental to
specify the swift compilation mode.
Note
This property only has effect when policy CMP0157 is set to NEW
prior to the first project() or enable_language() command
that enables the Swift language.