makefile – GNU make wildcard不再提供排序输出.有控制开关吗？

通配符函数返回版本3.81中的排序结果,但它在版本4.2中执行此操作.是否有任何编译/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

解决方法

如 NEWS文件中所述

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：= $(sort $(wildcard * .svp))

原文地址：https://www.jb51.cc/c/111156.html