dev-db/redis: early Lua-5.[23] support

This enables easier testing of Lua 5.2 & Lua 5.3 support in Redis.
It's blocked behind 'if false' at the moment, because it's clear the
upstream Redis doesn't entirely support it yet. Failure messages logged
in the ebuild.

Package-Manager: Portage-2.3.62, Repoman-2.3.12
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

dev-db/redis/redis-5.0.3.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Authors
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -68,9 +68,23 @@ src_prepare() {
 	cp "${FILESDIR}"/configure.ac-3.2 configure.ac || die
 
 	# Use the correct pkgconfig name for Lua
-	has_version 'dev-lang/lua:5.1' \
-		&& LUAPKGCONFIG=lua5.1 \
-		|| LUAPKGCONFIG=lua
+	if false && has_version 'dev-lang/lua:5.3'; then
+		# Lua5.3 gives:
+		#lua_bit.c:83:2: error: #error "Unknown number type, check LUA_NUMBER_* in luaconf.h"
+		LUAPKGCONFIG=lua5.3
+	elif false && has_version 'dev-lang/lua:5.2'; then
+		# Lua5.2 fails with:
+		# scripting.c:(.text+0x1f9b): undefined reference to `lua_open'
+		# Because lua_open because lua_newstate in 5.2
+		LUAPKGCONFIG=lua5.2
+	elif has_version 'dev-lang/lua:5.1'; then
+		LUAPKGCONFIG=lua5.1
+	else
+		LUAPKGCONFIG=lua
+	fi
+	# The upstream configure script handles luajit specially, and is not
+	# effected by these changes.
+	einfo "Selected LUAPKGCONFIG=${LUAPKGCONFIG}"
 	sed -i	\
 		-e "/^AC_INIT/s|, [0-9].+, |, $PV, |" \
 		-e "s:AC_CONFIG_FILES(\[Makefile\]):AC_CONFIG_FILES([${makefiles}]):g" \