plugin: Remove GNUism in openvpn-plugin.h generation

The plugin path handling cleanup (4590c383) introduced GNUism and broke
builds on system not using GNU Make (like *BSD).

Revert back to let configure generate the header file. Instead let make
add an extra CFLAG that defines PLUGIN_LIBDIR.

Signed-off-by: Christian Hesse <mail@eworm.de>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20170127084927.21040-1-list@eworm.de>
URL: http://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg13966.html
Signed-off-by: David Sommerseth <davids@openvpn.net>

configure.ac

@@ -38,7 +38,7 @@ AC_DEFINE([OPENVPN_VERSION_MINOR], [PRODUCT_VERSION_MINOR], [OpenVPN minor versi
 AC_DEFINE([OPENVPN_VERSION_PATCH], ["PRODUCT_VERSION_PATCH"], [OpenVPN patch level - may be a string or integer])
 
 AC_CONFIG_AUX_DIR([.])
-AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_HEADERS([config.h include/openvpn-plugin.h])
 AC_CONFIG_SRCDIR([src/openvpn/syshead.h])
 AC_CONFIG_MACRO_DIR([m4])
 

include/Makefile.am

@@ -16,10 +16,3 @@ MAINTAINERCLEANFILES = \
 include_HEADERS = \
 	openvpn-plugin.h \
 	openvpn-msg.h
-
-openvpn-plugin.h: openvpn-plugin.h.in Makefile
-	$(AM_V_GEN)sed -e 's|\@PLUGINDIR\@|$(plugindir)|' \
-		-e 's|\@OPENVPN_VERSION_MAJOR\@|$(OPENVPN_VERSION_MAJOR)|' \
-		-e 's|\@OPENVPN_VERSION_MINOR\@|$(OPENVPN_VERSION_MINOR)|' \
-		-e 's|\@OPENVPN_VERSION_PATCH\@|$(OPENVPN_VERSION_PATCH)|' \
-               $< > $@.tmp && mv $@.tmp $@

include/openvpn-plugin.h.in

@@ -27,8 +27,6 @@
 
 #define OPENVPN_PLUGIN_VERSION 3
 
-#define PLUGIN_LIBDIR "@PLUGINDIR@"
-
 #ifdef ENABLE_CRYPTO
 #ifdef ENABLE_CRYPTO_MBEDTLS
 #include <mbedtls/x509_crt.h>

src/openvpn/Makefile.am

@@ -27,7 +27,9 @@ AM_CFLAGS = \
 	$(OPTIONAL_CRYPTO_CFLAGS) \
 	$(OPTIONAL_LZO_CFLAGS) \
 	$(OPTIONAL_LZ4_CFLAGS) \
-	$(OPTIONAL_PKCS11_HELPER_CFLAGS)
+	$(OPTIONAL_PKCS11_HELPER_CFLAGS) \
+	-DPLUGIN_LIBDIR=\"${plugindir}\"
+
 if WIN32
 # we want unicode entry point but not the macro
 AM_CFLAGS += -municode -UUNICODE