mutter-45.* fails to build for musl targets due to the 'undeclared RLIMIT_RTTIME' error

[chrysos349]

Hey,

I've created the issue upstream a week ago. No answer.

Any ideas? Am I doing something wrong?

The issue is below.

mutter 45.* fails to (cross)build for musl targets due to the error: 'RLIMIT_RTTIME' undeclared.

AFAIK, RLIMIT_RTTIME was introduced in musl-1.2. Unfortunately, Void Linux has musl-1.1 and has no plans to update it.

It seems the only way to build successfully for musl targets in Void Linux is to disable wayland functionality by adding -Dnative_backend=false -Dwayland=false -Dxwayland=false to configure arguments, but this outcome is not desirable.

TLDR: Is there a way to patch mutter 45.* in order to be able to build it for musl targets in Void Linux with musl-1.1 which lacks RLIMIT_RTTIME?

RLIMIT_RTTIME[752/767] Compiling C object src/libmutter-13.so.0.0.0.p/backends_native_meta-thread.c.o
FAILED: src/libmutter-13.so.0.0.0.p/backends_native_meta-thread.c.o
aarch64-linux-musl-gcc -Isrc/libmutter-13.so.0.0.0.p -Isrc -I../src -I. -I.. -Iclutter -I../clutter -Iclutter/clutter -I../clutter/clutter -Imtk -I../mtk -Imtk/mtk -I../mtk/mtk -Icogl -I../cogl -Icogl/cogl -I../cogl/cogl -Isrc/meta -I/usr/aarch64-linux-musl/usr/include/glib-2.0 -I/usr/aarch64-linux-musl/usr/lib64/glib
-2.0/include -I/usr/aarch64-linux-musl/usr/include/gio-unix-2.0 -I/usr/aarch64-linux-musl/usr/include/libmount -I/usr/aarch64-linux-musl/usr/include/blkid -I/usr/aarch64-linux-musl/usr/include/graphene-1.0 -I/usr/aarch64-linux-musl/usr/lib64/graphene-1.0/include -I/usr/aarch64-linux-musl/usr/include/cairo -I/usr/aarch
64-linux-musl/usr/include/freetype2 -I/usr/aarch64-linux-musl/usr/include/libpng16 -I/usr/aarch64-linux-musl/usr/include/pixman-1 -I/usr/aarch64-linux-musl/usr/include/gdk-pixbuf-2.0 -I/usr/aarch64-linux-musl/usr/include/atk-1.0 -I/usr/aarch64-linux-musl/usr/include/json-glib-1.0 -I/usr/aarch64-linux-musl/usr/include/
pango-1.0 -I/usr/aarch64-linux-musl/usr/include/fribidi -I/usr/aarch64-linux-musl/usr/include/harfbuzz -I/usr/aarch64-linux-musl/usr/include/libwacom-1.0 -I/usr/aarch64-linux-musl/usr/include/gudev-1.0 -I/usr/aarch64-linux-musl/usr/include/libevdev-1.0/ -I/usr/aarch64-linux-musl/usr/include/gsettings-desktop-schemas -
I/usr/aarch64-linux-musl/usr/include/colord-1 -I/usr/aarch64-linux-musl/usr/include/gnome-settings-daemon-45 -I/usr/aarch64-linux-musl/usr/include/libei-1.0 -I/usr/aarch64-linux-musl/usr/include/gnome-desktop-4.0 -I/usr/aarch64-linux-musl/usr/include/libxml2 -I/usr/aarch64-linux-musl/usr/include/startup-notification-1
.0 -I/usr/aarch64-linux-musl/usr/include/pipewire-0.3 -I/usr/aarch64-linux-musl/usr/include/spa-0.2 -I/usr/aarch64-linux-musl/usr/include/gobject-introspection-1.0 -I/usr/aarch64-linux-musl/usr/include/uuid -I/usr/aarch64-linux-musl/usr/include/elogind -I/usr/aarch64-linux-musl/usr/include/libdrm -I/usr/aarch64-linux-
musl/usr/include -fvisibility=hidden -flto=auto -fdiagnostics-color=always -DNDEBUG -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -D_GNU_SOURCE -fstack-clash-protection -D_FORTIFY_SOURCE=2 -O2 -pipe -march=armv8-a -ffile-prefix-map=/builddir/mutter-45.3/build=. -fPIC -D_REENTRANT -pthread -DCLUTTER_ENABLE_COMPOSITOR_API
-DCOGL_ENABLE_EXPERIMENTAL_API -DCOGL_ENABLE_EXPERIMENTAL_2_0_API -DCOGL_ENABLE_MUTTER_API -DCLUTTER_DISABLE_DEPRECATION_WARNINGS -DCOGL_DISABLE_DEPRECATION_WARNINGS -DSN_API_NOT_YET_FROZEN=1 '-DGETTEXT_PACKAGE="mutter"' -DWITH_VERBOSE_MODE '-DG_LOG_DOMAIN="libmutter"' -MD -MQ src/libmutter-13.so.0.0.0.p/backends_nati
ve_meta-thread.c.o -MF src/libmutter-13.so.0.0.0.p/backends_native_meta-thread.c.o.d -o src/libmutter-13.so.0.0.0.p/backends_native_meta-thread.c.o -c ../src/backends/native/meta-thread.c
../src/backends/native/meta-thread.c: In function 'request_realtime_scheduling':
../src/backends/native/meta-thread.c:288:18: error: 'RLIMIT_RTTIME' undeclared (first use in this function); did you mean 'RLIMIT_RTPRIO'?
 288 |   if (setrlimit (RLIMIT_RTTIME, &rl) != 0)
     |                  ^~~~~~~~~~~~~
     |                  RLIMIT_RTPRIO
../src/backends/native/meta-thread.c:288:18: note: each undeclared identifier is reported only once for each function it appears in
[753/767] Linking target clutter/clutter/libmutter-clutter-13.so.0.0.0
[754/767] Generating cogl/cogl-pango/CoglPango-13.gir with a custom command (wrapped by meson to set env)
[755/767] Generating cogl/cogl/Cogl-13.typelib with a custom command
ninja: build stopped: subcommand failed.

[oreo639]

Seems like this was something fixed in musl 1.2.0 bminor/musl@2507e7f

We have packages that work around not having RLIMIT_RTTIME by adding -DRLIMIT_RTTIME=15 to the CFLAGS.

[chrysos349]

@oreo639
Thanks a lot! The issue is solved!

[oreo639]

Btw, the patch has been pulled in to void so the workaround should be unnecessary

[chrysos349]

@oreo639
Yes, I saw all your amazing PRs lately. You're on fire! You're a great addition to the Void Team.