makefile if defined
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 ... , #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 ... , 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 ., Any elegant solution to set the variable if empty? GNU make is hardly known for elegant solutions. Unless you find trapdoors and minefields to ..., TL;DR: Use the error function: ifndef MY_FLAG $(error MY_FLAG is not set) endif. Note that the lines must not be indented. More precisely, no ..., Makefile用法(define和if條件句). 六、多行變量 還有一種設置變量值的方法是使用define關鍵字。使用define關鍵字設置變量的值可以有換行，這有利 ...,The following example of a conditional tells make to use one set of libraries if the CC variable is ' gcc ', and a different set of libraries otherwise. It works by ... ,Conditional Syntax (GNU make) ... conditional-directive text-if-true else text-if-false endif. or: ... Variables that have never been defined have an empty value.
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 makefile if defined 相關參考資料
GNU make - Conditional Parts of Makefiles
The following example of a conditional tells make to use one set of libraries if the CC variable is `gcc' , and a different set of libraries otherwise. It works by ... ftp://ftp.gnu.org makefile的ifdef,ifeq使用及辨析_hjjdebug的专栏-CSDN博客
#ifdef 变量名称不能加$() 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 |