make, list and M pattern

[Giorgos Keramidas]

On Tue, 07 Apr 2009 23:54:13 +0400, Boris Samorodov <bsam at ipt.ru> wrote:
> Hello List,
>
> I need to create a list with some valid values and check an input
> value. Should this makefile work?
>
> -----
> LIST=f8 f9
>
> all:
> 	@echo USE_LINUX=${USE_LINUX}, LIST=${LIST}
> .if empty(LIST:M${USE_LINUX})
> 	@echo The value is invalid
> .else
> 	@echo The value is valid
> .endif
> -----
> % make USE_LINUX=f8
> USE_LINUX=f8, LIST=f8 f9
> The value is invalid
> -----

Hi Boris! :)

This is not exactly what you asked for, but you can probably loop
instead of trying to match regular expressions:

  keramida at kobe:/tmp$ cat -n Makefile
       1  LIST= f8 f9
       2  USE_LINUX?= f9
       3
       4  LINUX_VERSION= ${USE_LINUX:C/[ ]*([^ ]*)[ ]*/\1/}
       5
       6  .if defined(USE_LINUX)
       7  .for item in ${LIST}
       8  .if ${USE_LINUX} == ${item}
       9  RESULT= ${item}
      10  .endif
      11  .endfor
      12  .endif
      13
      14  all:
      15  .if empty(RESULT)
      16          @echo Version ${LINUX_VERSION} is not valid.
      17  .else
      18          @echo Valid version ${RESULT} selected.
      19  .endif
  keramida at kobe:/tmp$ make
  Valid version f9 selected.
  keramida at kobe:/tmp$ make -e USE_LINUX=f10
  Version f10 is not valid.
  keramida at kobe:/tmp$