Cleanup autotools scripts

The changes match that of php/pecl-database-pdo_ibm#16.

config.m4

@@ -1,12 +1,3 @@
-dnl $Id$
-dnl config.m4 for extension ibm_db2
-
-dnl Comments in this file start with the string 'dnl'.
-dnl Remove where necessary. This file will not work
-dnl without editing.
-
-dnl If your extension references something external, use with:
-
 PHP_ARG_WITH(IBM_DB2, for IBM_DB2 support,
 [  --with-IBM_DB2=[DIR]      Include IBM DB2 Universal Database and Cloudscape support.
                           DIR is the location of the DB2 application development 
@@ -14,112 +5,77 @@ PHP_ARG_WITH(IBM_DB2, for IBM_DB2 support,
                           environment variable to set the specific location of
                           the DB2 libraries])
 
-dnl PHP_ARG_ENABLE(IBM_DB2, whether to enable IBM_DB2 support,
-dnl Make sure that the comment is aligned:
-dnl [  --enable-IBM_DB2           Enable IBM_DB2 support])
 if test "$PHP_IBM_DB2" != "no"; then
-  dnl # checking php 32/64 bit php
-  AC_MSG_CHECKING(PHP)
-  if test `php -r 'echo PHP_INT_SIZE;'` = 8; then
-    machine_bits=64
-    libDir=lib64
-    AC_MSG_RESULT(Detected 64-bit PHP)
-  else
-    machine_bits=32
-    libDir=lib32
-    AC_MSG_RESULT(Detected 32-bit PHP)
-  fi
-  AC_MSG_CHECKING(IBM_DB_HOME location)
-  if test $IBM_DB_HOME ; then
-    SEARCH_PATH=$IBM_DB_HOME
-    AC_MSG_RESULT($IBM_DB_HOME)
-  else
-    AC_MSG_RESULT(not found)
-  fi
   dnl # --with-IBM_DB2 -> check with-path  	 
-  SEARCH_PATH="$PHP_IBM_DB2_LIB $SEARCH_PATH $PHP_IBM_DB2 $DB2PATH $DB2DIR"
+  SEARCH_PATH="$PHP_IBM_DB2_LIB $SEARCH_PATH $PHP_IBM_DB2 $IBM_DB_HOME $DB2PATH $DB2DIR"
 
-  AC_MSG_CHECKING(Looking for DB2 CLI libraries)
+  dnl Scan the library path for LUW, clidriver, and libdb400 in the usual
+  dnl places, also assuming include/ is in the directory too.
   for i in $SEARCH_PATH ; do
-    AC_MSG_CHECKING([     in $i])
-    if test -r $i/libdb2.so || test -r $i/libdb2.a || test -r $i/libdb400.a || test -r $i/libdb2.dylib ; then
-      LIB_DIR="$i/"
-      AC_MSG_RESULT(found)
+    dnl XXX: The messages kinda suck and don't indicate which path
+    dnl (combined with AC_MSG_* spew from AC_CHECK_LIB)
+    dnl XXX: Macros for this? Can these be merged?
+
+    dnl LUW ships its client libraries in lib64/32 (at least on amd64 linux)
+    AC_CHECK_SIZEOF([long])
+    AC_MSG_CHECKING([if we're on a 64-bit platform])
+    AS_IF([test "$ac_cv_sizeof_long" -eq 4],[
+      AC_MSG_RESULT([no])
+      PHP_CHECK_LIBRARY(db2, SQLDriverConnect, [
+        PHP_ADD_LIBPATH($i/lib32, IBM_DB2_SHARED_LIBADD)
+        PHP_ADD_LIBRARY(db2, 1, IBM_DB2_SHARED_LIBADD)
+        PHP_ADD_INCLUDE($i/include)
+        break
+      ], [], "-L$i/lib32" )
+    ],[
+      AC_MSG_RESULT([yes])
+      PHP_CHECK_LIBRARY(db2, SQLDriverConnect, [
+        PHP_ADD_LIBPATH($i/lib64, IBM_DB2_SHARED_LIBADD)
+        PHP_ADD_LIBRARY(db2, 1, IBM_DB2_SHARED_LIBADD)
+        PHP_ADD_INCLUDE($i/include)
+        break
+      ], [], "-L$i/lib64" )
+    ])
+    dnl The standalone clidriver package uses lib/
+    PHP_CHECK_LIBRARY(db2, SQLDriverConnect, [
+      PHP_ADD_LIBPATH($i/lib, IBM_DB2_SHARED_LIBADD)
+      PHP_ADD_LIBRARY(db2, 1, IBM_DB2_SHARED_LIBADD)
+      PHP_ADD_INCLUDE($i/include)
       break
-    else
-      AC_MSG_RESULT()
-    fi
-    AC_MSG_CHECKING([     in $i/$libDir])
-    if test -r $i/$libDir/libdb2.so || test -r $i/$libDir/libdb2.a || test -r $i/$libDir/libdb400.a || test -r $i/$libDir/libdb2.dylib ; then
-      LIB_DIR="$i/$libDir/"
-      AC_MSG_RESULT(found)
+    ], [
+    ], "-L$i/lib" )
+    dnl Special cases for PASE
+    dnl SG ships a custom libdb400 (with renamed funcs to co-exist w/ ODBC)
+    dnl it requires some special handling for headers too
+    PHP_CHECK_LIBRARY(db400sg, LDBDriverConnect, [
+      IBM_DB2_PASE=yes
+      dnl from RPMs libdb400sg-devel and sqlcli-devel
+      dnl as IBM i doesn't ship SQL/CLI headers w/ PASE (and RPM's in subdir)
+      PHP_ADD_LIBPATH($i/lib, IBM_DB2_SHARED_LIBADD)
+      PHP_ADD_LIBRARY(db400sg, 1, IBM_DB2_SHARED_LIBADD)
+      PHP_ADD_INCLUDE(/QOpenSys/pkgs/include/cli-sg)
+      PHP_ADD_INCLUDE(/QOpenSys/pkgs/include/cli)
       break
-    else
-      AC_MSG_RESULT()
-    fi
-    AC_MSG_CHECKING([     in $i/lib])
-    if test -r $i/lib/libdb2.so || test -r $i/lib/libdb2.a || test -r $i/lib/libdb400.a || test -r $i/lib/libdb2.dylib ; then
-      LIB_DIR="$i/lib/"
-      AC_MSG_RESULT(found)
+    ], [
+    ], "-L$i/lib" )
+    dnl Probably vanilla libdb400
+    dnl XXX: For PASE, libdb400 is likely on the default path
+    PHP_CHECK_LIBRARY(db400, SQLDriverConnect, [
+      IBM_DB2_PASE=yes
+      dnl from RPM sqlcli-devel
+      PHP_ADD_LIBPATH($i/lib, IBM_DB2_SHARED_LIBADD)
+      PHP_ADD_LIBRARY(db400, 1, IBM_DB2_SHARED_LIBADD)
+      PHP_ADD_INCLUDE(/QOpenSys/pkgs/include/cli)
       break
-    else
-      AC_MSG_RESULT()
-    fi
+    ], [
+    ], "-L$i/lib" )
   done
 
-  if test -z "$LIB_DIR"; then
-    AC_MSG_RESULT([not found])
-    if test $IBM_DB_HOME ; then
-      AC_MSG_ERROR([Cannot find DB2 CLI libraries. Check if you have set the IBM_DB_HOME environment variable's value correctly])
-    else
-       AC_MSG_ERROR([Environment variable IBM_DB_HOME is not set. Set it to your DB2/IBM_Data_Server_Driver installation directory and retry ibm_db2 module install])
-    fi
-  fi
-
-  if test -r $LIB_DIR/libdb400.a ; then
-    dnl PASE doesn't need that, we'll use the sqlcli-devel package.
-    PHP_ADD_INCLUDE(/QOpenSys/pkgs/include/cli)
-  else
-    dnl but LUW/Connect will
-    AC_MSG_CHECKING([for DB2 CLI include files in default path])
-    for i in $SEARCH_PATH ; do
-      AC_MSG_CHECKING([in $i])
-      dnl this is for V8.1 and previous
-      if test -r "$i/include/sqlcli1.h" ; then
-        IBM_DB2_DIR=$i
-        AC_MSG_RESULT(found in $i)
-        break
-      fi
-    done
-
-    if test -z "$IBM_DB2_DIR"; then
-      AC_MSG_RESULT([not found])
-      AC_MSG_ERROR([Please reinstall the DB2 CLI distribution])
-    fi
-
-    dnl # --with-IBM_DB2 -> add include path
-    PHP_ADD_INCLUDE($IBM_DB2_DIR/include)
-  fi
-
-  dnl # --with-IBM_DB2 -> check for lib and symbol presence
-  if test -r $LIB_DIR/libdb400.a ; then
-    LIBNAME=db400
+  if test "$IBM_DB2_PASE" = "yes" ; then
     PHP_NEW_EXTENSION(ibm_db2, ibm_db2.c, $ext_shared,,-DPASE)
   else
-    LIBNAME=db2
     PHP_NEW_EXTENSION(ibm_db2, ibm_db2.c, $ext_shared)
   fi
-  LIBSYMBOL=SQLConnect
-
-dnl #  PHP_CHECK_LIBRARY($LIBNAME,$LIBSYMBOL,
-dnl #  [
-    PHP_ADD_LIBRARY_WITH_PATH($LIBNAME, $LIB_DIR , IBM_DB2_SHARED_LIBADD)
-    AC_DEFINE(HAVE_DB2CLILIB,1,[ ])
-dnl #  ],[
-dnl #    AC_MSG_ERROR([wrong DB2 CLI lib version or lib not found])
-dnl #  ],[
-dnl #    -L$IBM_DB2_DIR/lib -lm -ldl
-dnl #  ])
 
   PHP_SUBST(IBM_DB2_SHARED_LIBADD)
 fi