opendkim-2.10.3-lua-pkgconfig.patch

From 1f1c947a983c49677544ab08dea3ea04869a8caf Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Sun, 26 Jan 2020 22:29:16 -0500
Subject: [PATCH 1/1] configure.ac: check for "lua" with pkg-config in addition
 to "lua5.1".

The upstream Lua pkg-config file is named lua.pc, so unless some
distribution renames it, OpenDKIM should be looking for "lua"
and not "lua5.1" in its PKG_CHECK_MODULES call. In any case, we
should definitely be checking for "lua", so this commit appends it
to the list of modules we look for. The "lua5.1" module was left
alone, because I don't know enough of the history to be sure that
removing it is the right thing to do.

When the call to PKG_CHECK_MODULES fails, OpenDKIM falls back to
a manual search that looks in /usr/lib, and this can detect 32-bit
libraries on a 64-bit system. Therefore it is preferable that the
PKG_CHECK_MODULES call succeed.

In the process of adding this fallback, I realized that some
additional actions need to be performed in the success branch of
the existing (and new) PKG_CHECK_MODULES call. The following
three lines were added,

  AC_SEARCH_LIBS([dlopen], [dl])
  AC_SUBST([LUA_MANNOTICE], "")
  AC_DEFINE([USE_LUA], 1, [support for Lua scripting])

to tell various parts of OpenDKIM that we do indeed have Lua support.
Afterwards, it became clear that those three lines could be factored
out of *every* lua check, so that has been done as well.

Closes: https://github.com/trusteddomainproject/OpenDKIM/issues/62
Gentoo-bug: https://bugs.gentoo.org/704556
---
 configure.ac | 45 +++++++++++++++++----------------------------
 1 file changed, 17 insertions(+), 28 deletions(-)

diff --git a/configure.ac b/configure.ac
index a478bb83..1d0db41a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1495,12 +1495,20 @@ lua_found="no"
 
 if test \(  x"$luapath" = x"auto" -o x"$luapath" = x"yes" \) -a x"$PKG_CONFIG" != x""
 then
-        PKG_CHECK_MODULES([LIBLUA], [lua5.1],
-	                  [
-				lua_found="yes"
-				LIBLUA_INCDIRS="$LIBLUA_CFLAGS"
-	                  ],
-			  [AC_MSG_WARN([pkg-config for Lua not found, trying manual search...])])
+  PKG_CHECK_MODULES([LIBLUA], [lua5.1], [
+      LIBLUA_INCDIRS="$LIBLUA_CFLAGS"
+      lua_found="yes"
+    ],
+    [
+      AC_MSG_WARN([pkg-config for lua5.1 not found, trying lua...])
+      PKG_CHECK_MODULES([LIBLUA], [lua], [
+          LIBLUA_INCDIRS="$LIBLUA_CFLAGS"
+          lua_found="yes"
+        ],
+	[AC_MSG_WARN([pkg-config for lua not found, trying manual search...])]
+      )
+    ]
+  )
 fi
 
 if test \( x"$luapath" = x"yes" -o x"$luapath" = x"auto" \) -a x"$lua_found" = x"no"
@@ -1515,10 +1523,6 @@ then
 			LIBLUA_INCDIRS="-I$d/include/lua51"
 			LIBLUA_LIBDIRS="-L$d/lib/lua51"
 			LIBLUA_LIBS="-llua -lm"
-			AC_SEARCH_LIBS([dlopen], [dl])
-			AC_DEFINE([USE_LUA], 1,
-			          [support for Lua scripting])
-			AC_SUBST([LUA_MANNOTICE], "")
 			lua_found="yes"
 			break
 		elif test -f $d/include/lua52/lua.h
@@ -1527,10 +1531,6 @@ then
 			LIBLUA_INCDIRS="-I$d/include/lua52"
 			LIBLUA_LIBDIRS="-L$d/lib/lua52"
 			LIBLUA_LIBS="-llua -lm"
-			AC_SEARCH_LIBS([dlopen], [dl])
-			AC_DEFINE([USE_LUA], 1,
-			          [support for Lua scripting])
-			AC_SUBST([LUA_MANNOTICE], "")
 			lua_found="yes"
 			break
 		elif test -f $d/include/lua5.1/lua.h
@@ -1539,10 +1539,6 @@ then
 			LIBLUA_INCDIRS="-I$d/include/lua5.1"
 			LIBLUA_LIBDIRS="-L$d/lib"
 			LIBLUA_LIBS="-llua5.1 -lm"
-			AC_SEARCH_LIBS([dlopen], [dl])
-			AC_DEFINE([USE_LUA], 1,
-			          [support for Lua scripting])
-			AC_SUBST([LUA_MANNOTICE], "")
 			lua_found="yes"
 			break
 		elif test -f $d/include/lua5.2/lua.h
@@ -1551,10 +1547,6 @@ then
 			LIBLUA_INCDIRS="-I$d/include/lua5.2"
 			LIBLUA_LIBDIRS="-L$d/lib"
 			LIBLUA_LIBS="-llua5.2 -lm"
-			AC_SEARCH_LIBS([dlopen], [dl])
-			AC_DEFINE([USE_LUA], 1,
-			          [support for Lua scripting])
-			AC_SUBST([LUA_MANNOTICE], "")
 			lua_found="yes"
 			break
 		elif test -f $d/include/lua.h
@@ -1563,7 +1555,6 @@ then
 			LIBLUA_INCDIRS="-I$d/include"
 			LIBLUA_LIBDIRS="-L$d/lib"
 			LIBLUA_LIBS="-llua -lm"
-			AC_SEARCH_LIBS([dlopen], [dl])
 			lua_found="yes"
 			break
 		fi
@@ -1588,7 +1579,6 @@ then
 		LIBLUA_INCDIRS="-I$luapath/include/lua51"
 		LIBLUA_LIBDIRS="-L$luapath/lib/lua51"
 		LIBLUA_LIBS="-llua -lm"
-		AC_SEARCH_LIBS([dlopen], [dl])
 		lua_found="yes"
 	elif test -f $luapath/include/lua52/lua.h
 	then
@@ -1596,7 +1586,6 @@ then
 		LIBLUA_INCDIRS="-I$luapath/include/lua52"
 		LIBLUA_LIBDIRS="-L$luapath/lib/lua52"
 		LIBLUA_LIBS="-llua -lm"
-		AC_SEARCH_LIBS([dlopen], [dl])
 		lua_found="yes"
 	elif test -f $luapath/include/lua5.1/lua.h
 	then
@@ -1604,7 +1593,6 @@ then
 		LIBLUA_INCDIRS="-I$luapath/include/lua5.1"
 		LIBLUA_LIBDIRS="-L$luapath/lib"
 		LIBLUA_LIBS="-llua5.1 -lm"
-		AC_SEARCH_LIBS([dlopen], [dl])
 		lua_found="yes"
 	elif test -f $luapath/include/lua5.2/lua.h
 	then
@@ -1612,7 +1600,6 @@ then
 		LIBLUA_INCDIRS="-I$luapath/include/lua5.2"
 		LIBLUA_LIBDIRS="-L$luapath/lib"
 		LIBLUA_LIBS="-llua5.2 -lm"
-		AC_SEARCH_LIBS([dlopen], [dl])
 		lua_found="yes"
 	elif test -f $luapath/include/lua.h
 	then
@@ -1620,7 +1607,6 @@ then
 		LIBLUA_INCDIRS="-I$luapath/include"
 		LIBLUA_LIBDIRS="-L$luapath/lib"
 		LIBLUA_LIBS="-llua -lm"
-		AC_SEARCH_LIBS([dlopen], [dl])
 		lua_found="yes"
 	else
 		AC_MSG_ERROR(not found at $luapath)
@@ -1629,6 +1615,9 @@ fi
 
 if test x"$lua_found" = x"yes"
 then
+	AC_SUBST([LUA_MANNOTICE], "")
+	AC_DEFINE([USE_LUA], 1, [support for Lua scripting])
+	AC_SEARCH_LIBS([dlopen], [dl])
 	saved_CPPFLAGS="$CPPFLAGS"
 	CPPFLAGS="$outer_CPPFLAGS $LIBLUA_INCDIRS"
 	AC_MSG_CHECKING([Lua version])
-- 
2.24.1