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From: Eric Biggers <ebiggers@kernel.org>
To: Jes Sorensen <jes.sorensen@gmail.com>
Cc: linux-fscrypt@vger.kernel.org, kernel-team@fb.com,
	Jes Sorensen <jsorensen@fb.com>
Subject: Re: [PATCH 2/2] Let package manager override CFLAGS and CPPFLAGS
Date: Tue, 19 May 2020 19:54:45 -0700
Message-ID: <20200520025445.GB3510@sol.localdomain> (raw)
In-Reply-To: <20200515205649.1670512-3-Jes.Sorensen@gmail.com>

On Fri, May 15, 2020 at 04:56:49PM -0400, Jes Sorensen wrote:
> From: Jes Sorensen <jsorensen@fb.com>
> 
> Package managers such as RPM wants to build everything with their
> preferred flags, and we shouldn't hard override flags.
> 
> Signed-off-by: Jes Sorensen <jsorensen@fb.com>
> ---
>  Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index c5f46f4..0c2a621 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -32,7 +32,7 @@ cc-option = $(shell if $(CC) $(1) -c -x c /dev/null -o /dev/null &>/dev/null; \
>  #### Common compiler flags.  You can add additional flags by defining CFLAGS
>  #### and/or CPPFLAGS in the environment or on the 'make' command line.

The above comment needs to be updated.

>  
> -override CFLAGS := -O2 -Wall -Wundef				\
> +CFLAGS := -O2 -Wall -Wundef				\
>  	$(call cc-option,-Wdeclaration-after-statement)		\
>  	$(call cc-option,-Wmissing-prototypes)			\
>  	$(call cc-option,-Wstrict-prototypes)			\
> @@ -40,7 +40,7 @@ override CFLAGS := -O2 -Wall -Wundef				\
>  	$(call cc-option,-Wimplicit-fallthrough)		\
>  	$(CFLAGS)

The user's $(CFLAGS) is already added at the end, so the -O2 can already be
overridden, e.g. with -O0.  Is your concern just that this is bad practice?

Also, did you intentionally leave $(CFLAGS) at the end, rather than remove it as
might be expected?

> -override CPPFLAGS := -D_FILE_OFFSET_BITS=64 $(CPPFLAGS)
> +CPPFLAGS := -D_FILE_OFFSET_BITS=64 $(CPPFLAGS)

-D_FILE_OFFSET_BITS=64 is required for correctness.
So I think this part is good as-is.

- Eric

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 20:56 [PATCH 0/2] fsverity-utils Makefile fixes Jes Sorensen
2020-05-15 20:56 ` [PATCH 1/2] Fix Makefile to delete objects from the library on make clean Jes Sorensen
2020-05-20  2:42   ` Eric Biggers
2020-05-15 20:56 ` [PATCH 2/2] Let package manager override CFLAGS and CPPFLAGS Jes Sorensen
2020-05-20  2:54   ` Eric Biggers [this message]
2020-05-20 20:00     ` Jes Sorensen
2020-05-20 20:08 [PATCH v2 0/2] fsverity-utils Makefile fixes Jes Sorensen
2020-05-20 20:08 ` [PATCH 2/2] Let package manager override CFLAGS and CPPFLAGS Jes Sorensen
2020-05-20 21:06   ` Eric Biggers
2020-05-20 21:20     ` Jes Sorensen
2020-05-20 21:25 [PATCH v3 0/2] fsverity-utils Makefile fixes Jes Sorensen
2020-05-20 21:25 ` [PATCH 2/2] Let package manager override CFLAGS and CPPFLAGS Jes Sorensen

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