Add compile options to a target.

target_compile_options(<target> [BEFORE]
  [<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])

Specify compile options to use when compiling a given target. The named <target> must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target.

If BEFORE is specified, the content will be prepended to the property instead of being appended.

This command can be used to add any options, but alternative commands exist to add preprocessor definitions (target_compile_definitions() and add_compile_definitions()) or include directories (target_include_directories() and include_directories()). See documentation of the directory and target COMPILE_OPTIONS properties.

The INTERFACE, PUBLIC and PRIVATE keywords are required to specify the scope of the following arguments. PRIVATE and PUBLIC items will populate the COMPILE_OPTIONS property of <target>. PUBLIC and INTERFACE items will populate the INTERFACE_COMPILE_OPTIONS property of <target>. (IMPORTED targets only support INTERFACE items.) The following arguments specify compile options. Repeated calls for the same <target> append items in the order called.

Arguments to target_compile_options may use “generator expressions” with the syntax $<...>. See the cmake-generator-expressions(7) manual for available expressions. See the cmake-buildsystem(7) manual for more on defining buildsystem properties.

The final set of compile options used for a target is constructed by accumulating options from the current target and the usage requirements of it dependencies. The set of options is de-duplicated to avoid repetition. While beneficial for individual options, the de-duplication step can break up option groups. For example, -D A -D B becomes -D A B. One may specify a group of options using shell-like quoting along with a SHELL: prefix. The SHELL: prefix is dropped and the rest of the option string is parsed using the separate_arguments() UNIX_COMMAND mode. For example, "SHELL:-D A" "SHELL:-D B" becomes -D A -D B.