Add options to the compilation of source files.
Adds options to the COMPILE_OPTIONS directory property. These options are used when compiling targets from the current directory and below.
add_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 options used for a target is constructed by accumulating options from the current target and the usage requirements of its dependencies. The set of options is de-duplicated to avoid repetition.
New in version 3.12: While beneficial for individual options, the de-duplication step can break up option groups. For example,
-option A -option B becomes
-option 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:-option A" "SHELL:-option B" becomes
-option A -option B.
Since different compilers support different options, a typical use of this command is in a compiler-specific conditional clause:
if (MSVC) # warning level 4 and all warnings as errors add_compile_options(/W4 /WX) else() # lots of warnings and all warnings as errors add_compile_options(-Wall -Wextra -pedantic -Werror) endif()
This command can be used to add any options. However, for adding preprocessor definitions and include directories it is recommended to use the more specific commands add_compile_definitions() and include_directories().
The command target_compile_options() adds target-specific options.
The source file property COMPILE_OPTIONS adds options to one source file.
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Licensed under the BSD 3-clause License.