makefile - GNU make 通配符不再提供排序输出。有控制开关吗？

Question

通配符函数在版本 3.81 中返回排序结果，但在版本 4.2 中确实这样做。有没有编译/运行时开关来控制这个功能？

下面显示了两个版本的 GNU make 的结果。

$ ls
a.mk  a0.svp  a1.svp  a2.svp  a3.svp  a4.svp  a5.svp  a6.svp  a7.svp  a8.svp  a9.svp

$ cat a.mk 
SVP_FILES := $(wildcard *.svp)

all:
        @echo $(SVP_FILES)

$ make  -f a.mk all          
a0.svp a1.svp **a2.svp a3.svp a4.svp a5.svp a6.svp a7.svp a8.svp a9.svp**

$ ~/sandbox/bin/make  -f a.mk all          
a0.svp a1.svp **a6.svp a5.svp a9.svp a4.svp a3.svp a2.svp a7.svp a8.svp**

$make –v | head -n 1

GNU Make 3.81

$ ~/sandbox/bin/make -v | head -n 1

GNU Make 4.2

Answer 1

如 NEWS 中所述文件

Version 3.82 (28 Jul 2010)

[...]

• WARNING: Backward-incompatibility! Wildcards were not documented as returning sorted values, but the results have been sorted up until this release.. If your makefiles require sorted results from wildcard expansions, use the $(sort ...) function to request it explicitly.

即SVP_FILES := $(排序 $(通配符 *.svp))