all:# Undefined variables are just empty strings!echo$(nowhere) Use+=to append foo := start foo += moreall:echo$(foo) String Substitutionis also a really common and useful way to modify variables. Also check outText FunctionsandFilename Functions. ...
ifeq ($(strip $(foo)),) <text-if-empty>; endif 这个示例中使用了“strip”函数,如果这个函数的返回值是空(Empty),那么<text-if-empty>;就生效。 第二个条件关键字是“ifneq”。语法是: ifneq (<arg1>;, <arg2>;) ifneq '<arg1>;' '<arg2>;' ifneq "<arg1>;" "<arg2>;" ifneq "<arg1...
一般把CMakeLists.txt文件放在工程目录下,使用时,先创建一个叫build的文件夹(这个并非必须,只是生成的Makefile等文件放在build里比较整齐),然后执行下列操作: cd build cmake .. make 其中cmake .. 在build里生成Makefile,make应当在有Makefile的目录下,根据Makefile生成可执行文件。 二、编写方法 # 声明要求的c...
#//: 到这里结束file(WRITE"/Users/lmy/.AndroidStudioProjects/AlSkia/src/skia/cmake/empty.cpp")execute_process(COMMANDninja-C"/Users/lmy/.AndroidStudioProjects/AlSkia/src/skia/cmake/"build.ninjaRESULT_VARIABLEninja_result)if(ninja_result)message(WARNING"Regeneration failed running ninja: ${ninja_...
The given file should be a CMake script containing SET commands that use the CACHE option, not a cache-format file. -D :<type>=<value> Create a cmake cache entry. When cmake is first run in an empty build tree, it cre- ates a CMakeCache.txt file and populates it with cus- ...
Breaking: drops python3.6 support Adds support for pattern matching naming rules, same as other variables Adds --show-violation-links option to show links to violation docs Adds __init_subclass__ in the beginning of accepted methods order as per WPS338 #2411 Adds WrongEmptyLinesCountViolation to...
As a special case, if the :variable:`FETCHCONTENT_SOURCE_DIR_<uppercaseName>` variable has a non-empty value for a dependency, it is assumed that the user is overriding all other methods of making that dependency available. ``FETCHCONTENT_TRY_FIND_PACKAGE_MODE`` will have no effect o...
# need to be able to build pytorch with an (almost) empty third_party # directory. # USE_SYSTEM_LIBS is a shortcut variable to toggle all the # USE_SYSTEM_* # variables on. Individual USE_SYSTEM_* variables can be toggled with # USE_SYSTEM_LIBS being "OFF". option(USE_SYSTEM...
# Create an empty config.h file, make dependencies require it touch dist/$(VIMRTDIR)/src/auto/config.h # Make sure configure is newer than config.mk to force it to be generated touch dist/$(VIMRTDIR)/src/configure # Make sure ja.sjis.po is newer than ja.po to avoid it bei...
Thespace-to-questionfunction can also be used to transform filenames with spaces in targets and prerequisites, since those allow globbing patterns to be used. space := $(empty) $(empty) # $(call space-to-question,file-name) space-to-question = $(subst $(space),?,$1) # $(call ques...