makefile if defined
#ifdef 变量名称不能加$() ifdef RELEASE $(warning RELEASE defined) else $(warning RELEASE not defined) endif #ifeq 后面参数要叫$(), 因为 ...,When you call this function, Make evaluates the definition, using whatever parameters you provide (irrelevant in this case). So if the definition includes ...
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makefile if defined 相關參考資料
GNU make - Conditional Parts of Makefiles
The following example of a conditional tells make to use one set of libraries if the CC variable is `gcc' , and a different set of libraries otherwise. It works by ... ftp://ftp.gnu.org makefile的ifdef,ifeq使用及辨析_hjjdebug的专栏-CSDN博客
#ifdef 变量名称不能加$() ifdef RELEASE $(warning RELEASE defined) else $(warning RELEASE not defined) endif #ifeq 后面参数要叫$(), 因为 ... https://blog.csdn.net How to use ifeq inside of a define in GNU Make? - Stack ...
When you call this function, Make evaluates the definition, using whatever parameters you provide (irrelevant in this case). So if the definition includes ... https://stackoverflow.com Checking if variables are defined in a makefile - Stack Overflow
Most likely your make directives must not be tab indented but start in the first column. I also suspect you want .if(...) or similar, not plain ifdef . https://stackoverflow.com Makefile set if variable is empty - Stack Overflow
Any elegant solution to set the variable if empty? GNU make is hardly known for elegant solutions. Unless you find trapdoors and minefields to ... https://stackoverflow.com Abort makefile if variable not set - Stack Overflow
TL;DR: Use the error function: ifndef MY_FLAG $(error MY_FLAG is not set) endif. Note that the lines must not be indented. More precisely, no ... https://stackoverflow.com Makefile用法(define和if條件句) - 雜記
Makefile用法(define和if條件句). 六、多行變量 還有一種設置變量值的方法是使用define關鍵字。使用define關鍵字設置變量的值可以有換行,這有利 ... http://deanjai.blogspot.com Conditional Example (GNU make)
The following example of a conditional tells make to use one set of libraries if the CC variable is ' gcc ', and a different set of libraries otherwise. It works by ... https://www.gnu.org Conditional Syntax (GNU make) - GNU.org
Conditional Syntax (GNU make) ... conditional-directive text-if-true else text-if-false endif. or: ... Variables that have never been defined have an empty value. https://www.gnu.org |