Re: [PATCH] tools/power/acpi: Fix the compile error when output directory is specified

Chen Yu
2021-11-23T17:06:16Z

On Tue, Nov 23, 2021 at 03:53:07PM +0200, Andy Shevchenko wrote:
> On Tue, Nov 23, 2021 at 09:23:30PM +0800, Chen Yu wrote:
> > Compiling the tool when output directory parameter is specified would
> > trigger the following error:
> >
> > make O=/data/test/tmp/ -C tools/power/acpi/
> >
> > make: Entering directory '/data/src/kernel/linux/tools/power/acpi'
> > DESCEND tools/acpidbg
> > make[1]: Entering directory '/data/src/kernel/linux/tools/power/acpi/tools/acpidbg'
> > MKDIR include
> > CP include
> > CC tools/acpidbg/acpidbg.o
> > Assembler messages:
> > Fatal error: can't create /data/test/tmp/tools/power/acpi/tools/acpidbg/acpidbg.o: No such file or directory
> > make[1]: *** [../../Makefile.rules:24: /data/test/tmp/tools/power/acpi/tools/acpidbg/acpidbg.o] Error 1
> > make[1]: Leaving directory '/data/src/kernel/linux/tools/power/acpi/tools/acpidbg'
> > make: *** [Makefile:18: acpidbg] Error 2
> > make: Leaving directory '/data/src/kernel/linux/tools/power/acpi'
> >
> > This is because the output directory has not been created yet. Fix this issue by
> > creating the output directory before compiling.
>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Thanks!
>
Thanks for review.
> >
> > $(objdir)%.o: %.c $(KERNEL_INCLUDE)
> > $(ECHO) " CC " $(subst $(OUTPUT),,$@)
> > + $(QUIET) $(MKDIR) -p $(objdir) 2>/dev/null
>
> Not sure we need the `2>/dev/null` part.
>
If the 'O=' is a read-only directory, mkdir would print errors
and adding 2> would avoid printing it. So the user could focus
on the real compile error.

without '2>' :
make O=/data/test/tmp -C tools/power/acpi/
make: Entering directory '/data/src/kernel/linux/tools/power/acpi'
DESCEND tools/acpidbg
mkdir: cannot create directory ‘/data/test/tmp/tools’: Permission denied

thanks,
Chenyu
> > $(QUIET) $(CC) -c $(CFLAGS) -o $@ $<
> >
> > all: $(OUTPUT)$(TOOL)
> > --
> > 2.25.1
> >
>
> --
> With Best Regards,
> Andy Shevchenko
>
>