Android makefiles：如何“提早返回”？

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问题描述

我正在使用ndk-build构建一个库的bucnh。在某些时候，一个mk文件可以包含两次，因为它导入第三方库，我使用全局变量保护双重导入：

I'm building a bucnh of libraries using ndk-build. At some point, a mk file could be included twice, as it imports 3rd party libraries, I protected double-import using a global variable:

# Importing nlopt!
# Prevent warnings reporting module was imported twice:
ifneq ($(imported_nlopt_$(TARGET_ARCH_ABI)),true)
    imported_nlopt_$(TARGET_ARCH_ABI) := true
    ifeq ($(APP_OPTIM),debug)
        # Importing static library nlopt_debug:
            include $(CLEAR_VARS)
            LOCAL_MODULE    := nlopt_debug
            LOCAL_SRC_FILES := nlopt/nlopt-2.4.2/lib/$(PLATFORM)/$(COMPILER)/Debug/$(LIB_PREFIX)nlopt$(DEBUG_INFIX)$(DYNAMIC_LINK_EXT)
            include $(PREBUILT_SHARED_LIBRARY)
    else
        # Importing static library nlopt_release:
            include $(CLEAR_VARS)
            LOCAL_MODULE    := nlopt_release
            LOCAL_SRC_FILES := nlopt/nlopt-2.4.2/lib/$(PLATFORM)/$(COMPILER)/Release/$(LIB_PREFIX)nlopt$(DYNAMIC_LINK_EXT)
            include $(PREBUILT_SHARED_LIBRARY)
    endif
else
    $(info "NLOPT already imported!")
endif

我需要在很多地方做到这一点，它开始厌烦我让整个文件在 if 语句。

I need to do this in many place and it starts anoying me to have the whole file being in an if statement.

makefile中是否支持早期回报？我可以这样做：

Are "early returns" supported in makefiles? Could I do something like:

ifeq ($(imported_nlopt_$(TARGET_ARCH_ABI)),true)
    return
endif

imported_nlopt_$(TARGET_ARCH_ABI) := true
...

$ b

return is not recognized when I execute this.

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Makefiles