c++17 is default now. See https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17966

.SRCINFO

@@ -1,6 +1,6 @@
 pkgbase = mesa-git
 	pkgdesc = an open-source implementation of the OpenGL specification, git version
-	pkgver = 22.3.0_devel.157974.50e6a80b5ea5.d41d8cd98f00b204e9800998ecf8427e
+	pkgver = 22.3.0_devel.159396.c3f51a5dcf2.d41d8cd98f00b204e9800998ecf8427e
 	pkgrel = 1
 	url = https://www.mesa3d.org
 	arch = x86_64

PKGBUILD

@@ -12,7 +12,7 @@
 
 pkgname=mesa-git
 pkgdesc="an open-source implementation of the OpenGL specification, git version"
-pkgver=22.3.0_devel.158200.854e8797ac3b.d41d8cd98f00b204e9800998ecf8427e
+pkgver=22.3.0_devel.159473.95cea62a9b7.d41d8cd98f00b204e9800998ecf8427e
 pkgrel=1
 arch=('x86_64')
 makedepends=('git' 'python-mako' 'xorgproto'
@@ -113,12 +113,9 @@ prepare() {
     done
 }
 
-# cpp_std=c++17 can be removed once https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17966 is merged
-
 build () {
     meson setup mesa _build \
        -D b_ndebug=true \
-       -D cpp_std=c++17 \
        -D platforms=x11,wayland \
        -D gallium-drivers=r300,r600,radeonsi,nouveau,virgl,svga,swrast,iris,crocus,zink,d3d12 \
        -D vulkan-drivers=amd,intel,swrast,virtio-experimental \