Re: [OE-core] [RFC PATCH 3/5] musl: set compatibility a bit more flexible

[Denys Dmytriyenko <denis@denix.org>]

On Thu, Oct 02, 2025 at 10:23:25AM -0700, Khem Raj wrote:
> On Thu, Oct 2, 2025 at 7:04 AM Denys Dmytriyenko <denis@denix.org> wrote:
> >
> > On Wed, Oct 01, 2025 at 07:12:34PM -0700, Khem Raj wrote:
> > > On Wed, Oct 1, 2025 at 5:08 PM Denys Dmytriyenko via
> > > lists.openembedded.org <denis=denix.org@lists.openembedded.org> wrote:
> > > >
> > > > From: Denys Dmytriyenko <denys@konsulko.com>
> > > >
> > > > Like musl Linux config, baremetal also uses musl as a libc, but
> > > > it has a different host triplet set. Hence adjust COMPATIBLE_HOST
> > > > to accomodate this use case by checking that musl is a preferred
> > > > provider of libc.
> > >
> > > This sounds a bit odd. Why do we use musl for baremetal targets ?
> >
> > Was like that for 10 years since the beginning of baremetal support:
> > https://git.openembedded.org/openembedded-core/commit/?id=cb010e306a6a856c589db5f41fdcaea4e5035d93
> >
> 
> A lot has changed since then in terms of toolchain sequences and dependencies
> it might be a good time to revise this

Yeah, that would be the next step and is part of my longer todo list.

We've noticed that the baremetal toolchain build is now much larger and much 
longer than how it used to be several years ago - there seems to be a lot of 
unnecessary dependencies being pulled just to build a couple of self-contained 
firmware images... Still need to investigate further though.


> > > while musl does have FDPIC support but I don't think thats how we
> > > use it.
> > >
> > > >
> > > > [YOCTO #15982]
> > > >
> > > > Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
> > > > ---
> > > >  meta/recipes-core/musl/bsd-headers.bb      | 2 +-
> > > >  meta/recipes-core/musl/libssp-nonshared.bb | 3 ++-
> > > >  2 files changed, 3 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/meta/recipes-core/musl/bsd-headers.bb b/meta/recipes-core/musl/bsd-headers.bb
> > > > index ad9ba81e4f..c6a3814a49 100644
> > > > --- a/meta/recipes-core/musl/bsd-headers.bb
> > > > +++ b/meta/recipes-core/musl/bsd-headers.bb
> > > > @@ -25,7 +25,7 @@ do_install() {
> > > >  #
> > > >  # We will skip parsing for non-musl systems
> > > >  #
> > > > +COMPATIBLE_HOST = "${@oe.utils.conditional('PREFERRED_PROVIDER_virtual/libc', 'musl', '.*', 'null', d)}"
> > > >
> > > > -COMPATIBLE_HOST = ".*-musl.*"
> > > >  DEV_PKG_DEPENDENCY = ""
> > > >  RRECOMMENDS:${PN}-dbg = "${PN}-dev (= ${EXTENDPKGV})"
> > > > diff --git a/meta/recipes-core/musl/libssp-nonshared.bb b/meta/recipes-core/musl/libssp-nonshared.bb
> > > > index 4bcbaef7ea..6f12ff0c9b 100644
> > > > --- a/meta/recipes-core/musl/libssp-nonshared.bb
> > > > +++ b/meta/recipes-core/musl/libssp-nonshared.bb
> > > > @@ -29,7 +29,8 @@ do_install() {
> > > >  #
> > > >  # We will skip parsing for non-musl systems
> > > >  #
> > > > -COMPATIBLE_HOST = ".*-musl.*"
> > > > +COMPATIBLE_HOST = "${@oe.utils.conditional('PREFERRED_PROVIDER_virtual/libc', 'musl', '.*', 'null', d)}"
> > > > +
> > > >  RDEPENDS:${PN}-staticdev = ""
> > > >  DEV_PKG_DEPENDENCY = ""
> > > >  RRECOMMENDS:${PN}-dbg = "${PN}-staticdev (= ${EXTENDPKGV})"
> > > > --
> > > > 2.25.1