tools/pkg-config: Replace with pkgconf

pkgconf is a newer, actively maintained implementation of pkg-config that
supports more aspects of the pkg-config file specification and provides a
library interface that applications can use to incorporate intelligent
handling of pkg-config files into themselves (such as build file
generators, IDEs, and compilers). Through its pkg-config compatibility
interface (activated when it is run as "pkg-config"), it also can
completely replace the original implementation.

It is also lighterweight and does not require glib2, as pkg-config does.

On other distros, pkgconf is symlinked to pkg-config. For simplicity here,
it is renamed to pkg-config.real, as in the original package.

Initial results have been positive. As before, pkgconf works as long as
the pkg-config files point to the proper paths.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
[backported upstream fix for Meson]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

3 files changed, 72 insertions, 0 deletions

diff --git a/tools/pkgconf/Makefile b/tools/pkgconf/Makefile
new file mode 100644
index 0000000000..cefee1edf0
--- /dev/null
+++ b/tools/pkgconf/Makefile
@@ -0,0 +1,33 @@
+#
+# Copyright (C) 2006-2016 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=pkgconf
+PKG_VERSION:=1.6.3
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=https://distfiles.dereferenced.org/pkgconf
+PKG_HASH:=61f0b31b0d5ea0e862b454a80c170f57bad47879c0c42bd8de89200ff62ea210
+
+HOST_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/host-build.mk
+
+unexport PKG_CONFIG
+
+define Host/Install
+	$(MAKE) -C $(HOST_BUILD_DIR) install
+	mv $(STAGING_DIR_HOST)/bin/pkgconf $(STAGING_DIR_HOST)/bin/pkg-config.real
+	$(INSTALL_BIN) ./files/pkg-config $(STAGING_DIR_HOST)/bin/pkg-config
+endef
+
+define Host/Clean
+	-$(MAKE) -C $(HOST_BUILD_DIR) uninstall
+	$(call Host/Clean/Default)
+endef
+
+$(eval $(call HostBuild))
diff --git a/tools/pkgconf/files/pkg-config b/tools/pkgconf/files/pkg-config
new file mode 100755
index 0000000000..82cc74ffcb
--- /dev/null
+++ b/tools/pkgconf/files/pkg-config
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+pkg-config.real --define-variable=prefix=${STAGING_PREFIX} --define-variable=exec_prefix=${STAGING_PREFIX} --define-variable=bindir=${STAGING_PREFIX}/bin $@
diff --git a/tools/pkgconf/patches/0001-cli-remove-version-to-modversion-remapping.patch b/tools/pkgconf/patches/0001-cli-remove-version-to-modversion-remapping.patch
new file mode 100644
index 0000000000..b2c538d24e
--- /dev/null
+++ b/tools/pkgconf/patches/0001-cli-remove-version-to-modversion-remapping.patch
@@ -0,0 +1,36 @@
+From 62bbd3b664d4b03011a4b382ed20353a91c30406 Mon Sep 17 00:00:00 2001
+From: Ariadne Conill <ariadne@dereferenced.org>
+Date: Tue, 21 Jan 2020 10:32:36 -0600
+Subject: [PATCH] cli: remove --version to --modversion remapping
+
+This has been a source of frequent complaints, so we drop it.
+Resolves: https://todo.sr.ht/~kaniini/pkgconf/6
+---
+ cli/main.c | 14 ++------------
+ 1 file changed, 2 insertions(+), 12 deletions(-)
+
+diff --git a/cli/main.c b/cli/main.c
+index 563ec8f0cfcd..fc698a4f9191 100644
+--- a/cli/main.c
++++ b/cli/main.c
+@@ -1005,18 +1005,8 @@ main(int argc, char *argv[])
+ 
+ 	if ((want_flags & PKG_VERSION) == PKG_VERSION)
+ 	{
+-		if (argc > 2)
+-		{
+-			fprintf(stderr, "%s: --version specified with other options or module names, assuming --modversion.\n", argv[0]);
+-
+-			want_flags &= ~PKG_VERSION;
+-			want_flags |= PKG_MODVERSION;
+-		}
+-		else
+-		{
+-			version();
+-			return EXIT_SUCCESS;
+-		}
++		version();
++		return EXIT_SUCCESS;
+ 	}
+ 
+ 	if ((want_flags & PKG_HELP) == PKG_HELP)