Mk/Uses/meson.mk: Do not force color output (D29353)

By default Meson forces color output.  Ninja strips the escape
sequences before they go into the log.  Samurai does not do that,
so we end up with some garbage in the logs.  Pass -Db_colorout=never
to Meson to disable colors in general.  Also see
https://mesonbuild.com/Builtin-options.html

This requires a small backport in devel/meson since the b_colorout
option is broken with Clang at the moment.

PR:		254678
Exp-run by:	antoine

Mk/Uses/meson.mk

@@ -36,6 +36,11 @@ CONFIGURE_ARGS+=	--prefix ${PREFIX} \
 			--mandir man \
 			--infodir ${INFO_PATH}
 
+# Disable color output.  Meson forces it on by default, Ninja
+# strips it before it goes to the log, but Samurai does not, so we
+# might end up with ANSI escape sequences in the logs.
+CONFIGURE_ARGS+=	-Db_colorout=never
+
 # meson has it own strip mechanic
 INSTALL_TARGET=		install
 

devel/meson/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	meson
 PORTVERSION=	0.57.1
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	https://github.com/mesonbuild/${PORTNAME}/releases/download/${PORTVERSION}/
 

devel/meson/files/patch-mesonbuild_compilers_mixins_clang.py

@@ -0,0 +1,24 @@
+From c24a0f852489124fa002bdc90b5753547899b1cb Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Krzysztof=20Ma=C5=82ysa?= <varqox@gmail.com>
+Date: Tue, 16 Feb 2021 18:46:06 +0100
+Subject: [PATCH] compilers: clang: Drop -Xclang before -fcolor-diagnostics
+ flag
+
+Using -Xclang -fcolor-diagnostics provides no advantage to using just -fcolor-diagnostics option and sometimes causes problems:
+* uncolored diagnostics on Arch Linux: https://bugs.archlinux.org/task/69662
+* simple problem with removing flag -fcolor-diagnostics:  https://github.com/clangd/clangd/issues/279
+--- mesonbuild/compilers/mixins/clang.py.orig	2021-02-20 13:17:16 UTC
++++ mesonbuild/compilers/mixins/clang.py
+@@ -29,9 +29,9 @@ if T.TYPE_CHECKING:
+     from ...dependencies import Dependency  # noqa: F401
+ 
+ clang_color_args = {
+-    'auto': ['-Xclang', '-fcolor-diagnostics'],
+-    'always': ['-Xclang', '-fcolor-diagnostics'],
+-    'never': ['-Xclang', '-fno-color-diagnostics'],
++    'auto': ['-fcolor-diagnostics'],
++    'always': ['-fcolor-diagnostics'],
++    'never': ['-fno-color-diagnostics'],
+ }  # type: T.Dict[str, T.List[str]]
+ 
+ clang_optimization_args = {