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Message-ID: <20200616175550.GJ6430@brightrain.aerifal.cx>
Date: Tue, 16 Jun 2020 13:55:51 -0400
From: Rich Felker <dalias@...c.org>
To: Yuval Deutscher <yuval.d@...tsilicon.com>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] build: allow forcing generic implementations of
library functions
On Tue, Jun 16, 2020 at 08:22:23PM +0300, Yuval Deutscher wrote:
> This change allows excluding chosen functions from ARCH_OBJS thus
> causing the library to be built with non-platform-specific versions of
> them. The option can be used by setting the FORCE_GENERIC variable when
> invoking make.
>
> Signed-off-by: Yuval Deutscher <yuval.d@...tsilicon.com>
> ---
> Makefile | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index bd8f5c38..c6e5a386 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -23,7 +23,8 @@ ARCH_GLOBS = $(addsuffix /$(ARCH)/*.[csS],$(SRC_DIRS))
> BASE_SRCS = $(sort $(wildcard $(BASE_GLOBS)))
> ARCH_SRCS = $(sort $(wildcard $(ARCH_GLOBS)))
> BASE_OBJS = $(patsubst $(srcdir)/%,%.o,$(basename $(BASE_SRCS)))
> -ARCH_OBJS = $(patsubst $(srcdir)/%,%.o,$(basename $(ARCH_SRCS)))
> +ALL_ARCH_OBJS = $(patsubst $(srcdir)/%,%.o,$(basename $(ARCH_SRCS)))
> +ARCH_OBJS = $(filter-out $(addprefix %/,$(addsuffix .o,$(FORCE_GENERIC))), $(ALL_ARCH_OBJS))
> REPLACED_OBJS = $(sort $(subst /$(ARCH)/,/,$(ARCH_OBJS)))
> ALL_OBJS = $(addprefix obj/, $(filter-out $(REPLACED_OBJS), $(sort $(BASE_OBJS) $(ARCH_OBJS))))
>
> --
> 2.25.1
Can you clarify what problem this is attempting to solve? Maybe it
could be solved better in a different way. As written, this patch
creates an option that produces broken builds unless you follow
unwritten rules about which files are valid to include in
FORCE_GENERIC. Only a very small portion of the ARCH_OBJS (mainly
string and math) are optional optimizations rather than hard
requirements.
Rich
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