[PATCH] configure/make basics

[Jens Rehsack <jr_extern@vfnet.de>]

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Hi,

while hacking on a plugin for mmsd to deal with supl push
messages, I ran into a few "not so nice" solved things
in configure.ac / Makefile.am

1) libtool handling
   libtool configuration is meanwhile done using LT_INIT(options)
   instead of AC_PROC_LIBTOOL and alike
   ==> because of libtool stores some of the configuration
       in the generated libtool shell script, it's reasonable
       to run LT_INIT as late as possible (painfully learned
       while writing and porting c++ software for many OS)
2) additional libraries
   do no require explicit libraries (like -lresolv), always
   let a devop in doubt invoke configure with
   LIBS="-lmyspecialwrapper" to wrap between available
   libs/functions and requirements
   See pkgsrc's nbcompat library for example

Best regards,
Jens

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>From f2f5c911c0ac71ae0cdb0d7f54bbc0232ca001a1 Mon Sep 17 00:00:00 2001
From: Jens Rehsack <jr_extern@vfnet.de>
Date: Mon, 27 Feb 2012 15:41:34 +0100
Subject: [PATCH 2/3] changing depreciated libtool initialization to modern
 one

---
 Makefile.am  |    4 ++++
 configure.ac |   10 ++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index c3a4486..bebcb90 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,10 @@
 
 AM_MAKEFLAGS = --no-print-directory
 
+LIBTOOL_DEPS = @LIBTOOL_DEPS@
+libtool: $(LIBTOOL_DEPS)
+	$(SHELL) ./config.status libtool
+
 gdbus_sources = gdbus/gdbus.h gdbus/mainloop.c gdbus/watch.c \
 					gdbus/object.c gdbus/polkit.c
 
diff --git a/configure.ac b/configure.ac
index 34cc526..d82569b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,8 +31,8 @@ AC_PROG_INSTALL
 m4_define([_LT_AC_TAGCONFIG], [])
 m4_ifdef([AC_LIBTOOL_TAGS], [AC_LIBTOOL_TAGS([])])
 
-AC_DISABLE_STATIC
-AC_PROG_LIBTOOL
+dnl AC_DISABLE_STATIC
+dnl AC_PROG_LIBTOOL
 
 AC_ARG_ENABLE(optimization, AC_HELP_STRING([--disable-optimization],
 			[disable code optimization through compiler]), [
@@ -58,6 +58,12 @@ AC_ARG_ENABLE(pie, AC_HELP_STRING([--enable-pie],
 	fi
 ])
 
+dnl LT_INIT should be invoked after all compiler flags checks, because
+dnl of LT_INIT remembers the RPATH stored in test targets which might
+dnl be different for different compiler flags (known issue on AIX)
+LT_INIT([dlopen,disable-static])
+AC_SUBST([LIBTOOL_DEPS])
+
 AC_CHECK_HEADERS(resolv.h, dummy=yes,
 			AC_MSG_ERROR(resolver header files are required))
 AC_CHECK_LIB(resolv, ns_initparse, dummy=yes, [
-- 
1.7.9.1


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>From 47383148c76675da9965a4d54e0e1b985da22a6a Mon Sep 17 00:00:00 2001
From: Jens Rehsack <jr_extern@vfnet.de>
Date: Mon, 27 Feb 2012 16:07:18 +0100
Subject: [PATCH 3/3] let configure find required libs

---
 Makefile.am  |    2 +-
 configure.ac |   24 +++++++++++++++++-------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index bebcb90..178def4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,7 +28,7 @@ src_mmsd_SOURCES = $(gdbus_sources) $(gweb_sources) $(builtin_sources) \
 			src/push.h src/push.c src/store.h src/store.c \
 			src/wsputil.h src/wsputil.c src/mmsutil.h src/mmsutil.c
 
-src_mmsd_LDADD = $(builtin_libadd) @GLIB_LIBS@ @DBUS_LIBS@ -lresolv -ldl
+src_mmsd_LDADD = $(builtin_libadd) @GLIB_LIBS@ @DBUS_LIBS@
 
 src_mmsd_LDFLAGS = -Wl,--export-dynamic
 
diff --git a/configure.ac b/configure.ac
index d82569b..883b59c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,15 +64,25 @@ dnl be different for different compiler flags (known issue on AIX)
 LT_INIT([dlopen,disable-static])
 AC_SUBST([LIBTOOL_DEPS])
 
+dnl check how we can use the resolver. while resolv.h comes with bind,
+dnl it's probably reasonable to use a combined search macro like
+dnl smart-snmpd's ACX_CHECK_LIB_FLAGS
 AC_CHECK_HEADERS(resolv.h, dummy=yes,
 			AC_MSG_ERROR(resolver header files are required))
-AC_CHECK_LIB(resolv, ns_initparse, dummy=yes, [
-	AC_CHECK_LIB(resolv, __ns_initparse, dummy=yes,
-			AC_MSG_ERROR(resolver library support is required))
-])
-
-AC_CHECK_LIB(dl, dlopen, dummy=yes,
-			AC_MSG_ERROR(dynamic linking loader is required))
+dnl ns_initparse is libresolv internal use only - limited usage intended?
+AC_SEARCH_LIBS(ns_initparse, resolv, ,
+		AC_MSG_ERROR(resolver support is required))
+dnl AC_CHECK_LIB(resolv, ns_initparse, dummy=yes, [
+dnl 	AC_CHECK_LIB(resolv, __ns_initparse, dummy=yes,
+dnl 			AC_MSG_ERROR(resolver library support is required))
+dnl ])
+
+dnl search how we can load dynamic libraries
+dnl TODO use libltdl, which would work on BeOS (Haiku), Darwin (MacOS X) or
+dnl      for debugging purposes with libtool's dlpreopen
+AC_SEARCH_LIBS(dlopen, dl, , AC_MSG_ERROR(dynamic linking loader is required))
+dnl AC_CHECK_LIB(dl, dlopen, dummy=yes,
+dnl 			AC_MSG_ERROR(dynamic linking loader is required))
 
 PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.16, dummy=yes,
 				AC_MSG_ERROR(GLib >= 2.16 is required))
-- 
1.7.9.1