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option和target下的add_defines行为不同, 这是设计如此还是bug? #6367

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ZZH-Finalize asked this question in Q&A
option和target下的add_defines行为不同, 这是设计如此还是bug? #6367
@ZZH-Finalize ZZH-Finalize
Apr 25, 2025 · 1 comment
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ZZH-Finalize
Apr 25, 2025

我本意是想通过xmake f --menu的界面来调整C代码里宏定义的值, 正常来说如果修改了这个值, 那么就应该生成新的宏定义并且C文件应当重新编译, 但我发现, 如果把生成宏定义的add_defines语句放在target的定义下面, 这些动作都是正常的, 但如果把它放在option下面, 然后target下面添加对应的option, 那么当option的值改变时, 就不会生成新的宏定义,代码也不会重新编译
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ZZH-Finalize
Apr 25, 2025
Author

option的值变化后能生效的写法:

option('CFG')
    set_default('4')

target('main')
    add_defines('CONFIG_A=$(CFG)')

option的值变化后无法生效的写法:

option('CFG')
    set_default('4')
    add_defines('CONFIG_A=$(CFG)')

target('main')
    add_options('CFG')

这是正常现象还是bug?
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