makefile - 如何比较Makefile中的两个字符串变量

Question

我有以下代码:

LOCAL_VERSION := $(shell some_binary -v | head -n 1)
REMOTE_VERSION := $(shell curl -s https://example.com/key)

all:
    ifeq($(REMOTE_VERSION), $(LOCAL_VERSION))
        @echo yes
    endfi

但我得到了这个:

user:tmp user$ make
ifeq(v0.11.1, v0.11.1)
/bin/sh: -c: line 0: syntax error near unexpected token `v0.11.1,'
/bin/sh: -c: line 0: `ifeq(v0.11.1, v0.11.1)'
make: *** [all] Error

我在 Mac OSX 上，但无论如何它都在使用 GNU Make。

Answer 1

ifeq应该不缩进，例如

LOCAL_VERSION := $(shell some_binary -v | head -n 1)
REMOTE_VERSION := $(shell curl -s https://example.com/key)

all:
ifeq ($(REMOTE_VERSION), $(LOCAL_VERSION))
    @echo yes
else
    @echo NO
endif