如何检测GNU make中使用的shell? [英] How to detect shell used in GNU make?

问题描述

如何检测gnu make将使用的shell?我希望我的品牌可以在以下平台上运行:

How can I detect shell that will be used by gnu make? I want my make to be running on following platforms:

• Linux
• windows
• 装有cygwin的Windows(请注意，在装有cygwin的Windows上，make使用cygwin shell)

然后，我想检测gcc是否独立存在于OS上的系统上.

Then I would like to detect if gcc is present on the system independently on OS.

推荐答案

到目前为止，我提出了以下解决方案:

So far I come up with this solution:

# detect what shell is used
ifeq ($(findstring cmd.exe,$(SHELL)),cmd.exe)
$(info "shell Windows cmd.exe")
DEVNUL := NUL
WHICH := where
else
$(info "shell Bash")
DEVNUL := /dev/null
WHICH := which
endif

# detect platform independently if gcc is installed
ifeq ($(shell ${WHICH} gcc 2>${DEVNUL}),)
$(error "gcc is not in your system PATH")
else
$(info "gcc found")
endif

可选地，当我需要检测更多我可以使用的工具时:

optionally when I need to detect more tools I can use:

EXECUTABLES = ls dd 
K := $(foreach myTestCommand,$(EXECUTABLES),\
        $(if $(shell ${WHICH} $(myTestCommand) 2>${DEVNUL} ),\
            $(myTestCommand) found,\
            $(error "No $(myTestCommand) in PATH)))
$(info ${K})        

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