Shell 在Makefile中拆分和剪切字符串

我正在制作一个Makefile

version := v39.0.12.8    // format rules: va.b.c.d

我想得到基于格式的版本a，在本例中是39。 如何做到这一点？可能通过sed/cut/awk，但我不熟悉这些shell命令

e、 g

这可以通过make功能实现，如下所示：

$ cat Makefile
version := v39.0.12.8

version_tuple := $(subst ., ,$(version:v%=%))

version_a := $(word 1,$(version_tuple))
version_b := $(word 2,$(version_tuple))
version_c := $(word 3,$(version_tuple))
version_d := $(word 4,$(version_tuple))

all:
        echo version_tuple = $(version_tuple)
        echo version_a = $(version_a)
        echo version_b = $(version_b)
        echo version_c = $(version_c)
        echo version_d = $(version_d)

输出：

$ make -s
version_tuple = 39 0 12 8
version_a = 39
version_b = 0
version_c = 12
version_d = 8

这可以通过make功能实现，如下所示：

$ cat Makefile
version := v39.0.12.8

version_tuple := $(subst ., ,$(version:v%=%))

version_a := $(word 1,$(version_tuple))
version_b := $(word 2,$(version_tuple))
version_c := $(word 3,$(version_tuple))
version_d := $(word 4,$(version_tuple))

all:
        echo version_tuple = $(version_tuple)
        echo version_a = $(version_a)
        echo version_b = $(version_b)
        echo version_c = $(version_c)
        echo version_d = $(version_d)

输出：

$ make -s
version_tuple = 39 0 12 8
version_a = 39
version_b = 0
version_c = 12
version_d = 8

使用，您可以在您的版本号上执行：

include gmtt/gmtt.mk

version := v39.0.12.8

matchresult := $(call glob-match,$(version),v*.*.*.*)

$(info [$(matchresult)])

major := $(word 2,$(matchresult))
minor := $(word 4,$(matchresult))
bugfix := $(word 6,$(matchresult))
buildcnt := $(word 8,$(matchresult))

$(info Major = $(major))
$(info Minor = $(minor))
$(info Bugfix = $(bugfix))
$(info Buildcnt = $(buildcnt))

$(if $(call int-ge,$(major),39),$(info Major is 39 or higher!))

使用，您可以在您的版本号上执行：

include gmtt/gmtt.mk

version := v39.0.12.8

matchresult := $(call glob-match,$(version),v*.*.*.*)

$(info [$(matchresult)])

major := $(word 2,$(matchresult))
minor := $(word 4,$(matchresult))
bugfix := $(word 6,$(matchresult))
buildcnt := $(word 8,$(matchresult))

$(info Major = $(major))
$(info Minor = $(minor))
$(info Bugfix = $(bugfix))
$(info Buildcnt = $(buildcnt))

$(if $(call int-ge,$(major),39),$(info Major is 39 or higher!))

---

这可能有助于GNU make：这可能有助于GNU make：