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Date: Thu, 27 Nov 2025 11:46:27 +0000
Message-Id: <DEJGAQEW9WJE.29HYBUAEB67LC@posteo.net>
Subject: =?utf-8?q?Re:_is_it_possible_to_compile_Alpine_for_486=EF=BC=9F?=
From: "Sertonix" <sertonix@posteo.net>
To: =?utf-8?q?=E5=B0=A4=E6=99=93=E6=9D=B0?= <yxj790222@163.com>,
 <~alpine/devel@lists.alpinelinux.org>
References: <79f84b0c.6915.19ac43bb080.Coremail.yxj790222@163.com>
In-Reply-To: <79f84b0c.6915.19ac43bb080.Coremail.yxj790222@163.com>

On Thu Nov 27, 2025 at 8:33 AM CET, =E5=B0=A4=E6=99=93=E6=9D=B0 wrote:
> How can I modify -march parameter gracefully when I abuild command? Using=
 abuild the default is -march=3Di586 -mtune=3Dgeneric, is there a place to =
modify this parameter gracefully? and I have my best minimum kernel configu=
re (best-mini.conf), how can I use my .conf file gracefully in abuild scrip=
t?
>
> 6 	586/K5/5x86/6x86/6x86MX 	(-mtune=3Dgeneric ; SIMD assembly modules ena=
bled based on simple compile test and/or presence of CPU flag) 	1000 HZ 	Vo=
luntary Kernel Preemption (Desktop) 	32=20
>
> does I need to compile i486-alpine-gcc crossing compile tools first?

I have never tried adding flags like -march without compiling a cross
compiler. There may be ways to make it work but I would not recommend it.

I would recommend to adapt _arch_configure in main/gcc/APKBUILD for your
target and then compile the cross compiler (with something like
scripts/bootstrap.sh <arch>).

You will likely encounter issues due to abuild missing (usable)
arch/triplet mappings for i486. The simplest (but a bit hacky) was is to
patch /usr/share/abuild/functions.sh. Ether by changing the "x86" arch to
be considered as i486 instead of i586:

--- a/functions.sh.in
+++ b/functions.sh.in
@@ -30 +30 @@ arch_to_triplet() {
-	x86)		echo "i586-alpine-linux-musl" ;;
+	x86)		echo "i486-alpine-linux-musl" ;;

Or by adding "i486" as new arch which may require changing more aports
to handle "i486" similar to "x86".

--- a/functions.sh.in
+++ b/functions.sh.in
@@ -29,2 +29,3 @@ arch_to_triplet() {
 	sh4)		echo "sh4-alpine-linux-musl" ;;
+	i486)		echo "i486-alpine-linux-musl" ;;
 	x86)		echo "i586-alpine-linux-musl" ;;
@@ -47,2 +48,3 @@ triplet_to_arch() {
 	armv7*-*-*-*eabihf)	echo "armv7" ;;
+	i486-*-*-*)		echo "i486" ;;
 	i[0-9]86-*-*-*)		echo "x86" ;;