Re: Running specific part of a Makefile under a specific shell

[Kaz Kylheku (gmake)]

On 2022-02-10 15:15, peter0x44 wrote:
> Hi all,
> I have a Makefile that is intended for running under both Windows and
> Linux, for the raylib library.
> https://github.com/raysan5/raylib/blob/master/src/Makefile
>
> This Makefile, under Windows, for the `make clean` target uses the del
> builtin command of cmd.exe to delete files.
>
> clean:
> ifeq ($(PLATFORM_OS),WINDOWS)
>         del *.o /s
>         cd $(RAYLIB_RELEASE_PATH)
>         del lib$(RAYLIB_LIB_NAME).a /s

That doesn't work unless you have .ONESHELL so that the multiple lines
of a recipe are executed as one script.

You probably want del $(RAYLIB_RELEASE_PATH)/lib$(RAYLIB_LIB_NAME).a /s,
without any cd.

>         del lib$(RAYLIB_LIB_NAME)dll.a /s
>         del $(RAYLIB_LIB_NAME).dll /s
> else
>
> However, that the shell is always cmd.exe is a bad assumption on
> Windows, as this won't be true if GNU Make finds sh.exe in the PATH,

Therefore, a different variable is probably needed for this.

Somewhere near the top, conditionally define a DEL macro:

  ifneq ($(CONFIG_CMD_EXE),)
  DEL := del $1 /s
  else
  DEL := rm -f $1
  endif

then in the clean recipe just

  $(call DEL,*.o)
  $(call DEL,$(RAYLIB_RELEASE_PATH)/lib$(RAYLIB_LIB_NAME).a)

this CONFIG_CMD_EXE variable is somewhat independent in that
whereas it will always be false (blank, unset) if you're not
building for Windows, it could be true or false if you are building
under Windows.

Somewhere you need to set this configuration variable in a way
which matches the situation: what sort of make installation is being 
used.

E.g in a config.make file which is included.