如何有条件地将ALL选项添加到add_custom_target()? [英] How to conditionally add ALL option to add_custom_target()?
本文介绍了如何有条件地将ALL选项添加到add_custom_target()?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如果用户在 cmake-gui
中选择$ {DO_HTML}开关,我想有条件地将目标 docs_html
包含在 ALL
中.没有这种丑陋的代码重复怎么办?
I would like to conditionally include the target docs_html
to ALL
if user selects ${DO_HTML} switch in cmake-gui
. How to do without this ugly code repetition?
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(docs)
set(DO_HTML 1 CACHE BOOL "Whether generate documentation in static HTML")
if (${DO_HTML})
#This command doesn't work:
# add_dependencies(ALL docs_html)
add_custom_target(docs_html ALL #Code repeat 1
DEPENDS ${HTML_DIR}/index.html
)
else()
add_custom_target(docs_html #Code repeat 2
DEPENDS ${HTML_DIR}/index.html
)
endif()
推荐答案
您可以使用变量的取消引用来形成命令调用的条件部分.空值(例如,如果没有变量)将被忽略:
You may use variable's dereference to form conditional parts of command's invocation. Empty values (e.g. if variable is absent) is simply ignored:
# Conditionally form variable's content.
if (DO_HTML)
set(ALL_OPTION ALL)
# If you prefer to not use uninitialized variables, uncomment next 2 lines.
# else()
# set(ALL_OPTION)
endif()
# Use variable in command's invocation.
add_custom_target(docs_html ${ALL_OPTION}
DEPENDS ${HTML_DIR}/index.html
)
该变量甚至可以包含该命令的几个参数.例如.可以有条件地为目标添加其他 COMMAND 子句:
Variable may contain even several parameters to the command. E.g. one may conditionally add additional COMMAND clause for the target:
if(NEED_ADDITIONAL_ACTION) # Some condition
set(ADDITIONAL_ACTION COMMAND ./run_something arg1)
endif()
add_custom_target(docs_html ${ALL_OPTION}
${ADDITIONAL_ACTION}
DEPENDS ${HTML_DIR}/index.html
)
这篇关于如何有条件地将ALL选项添加到add_custom_target()?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文