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

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Message-ID: <20211123170332.GA27921@chenyu5-mobl1>
Date:   Wed, 24 Nov 2021 01:03:32 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-acpi@...r.kernel.org, Robert Moore <robert.moore@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>, devel@...ica.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/power/acpi: Fix the compile error when output
 directory is specified

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@...ux.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
> 
>