Added --enable-curldebug configure option to enable and disable building

with the low-level curl debug memory tracking 'feature' to allow decoupled
setting from --enable-debug.

configure.ac

@@ -41,6 +41,7 @@ AM_MAINTAINER_MODE
 CURL_CHECK_OPTION_DEBUG
 CURL_CHECK_OPTION_OPTIMIZE
 CURL_CHECK_OPTION_WARNINGS
+CURL_CHECK_OPTION_CURLDEBUG
 
 CURL_CHECK_PATH_SEPARATOR
 
@@ -155,8 +156,6 @@ AC_SYS_LARGEFILE
 dnl support building of Windows DLLs
 AC_LIBTOOL_WIN32_DLL
 
-CURL_PROCESS_DEBUG_BUILD_OPTS
-
 dnl force libtool to build static libraries with PIC on AMD64-Linux & FreeBSD
 AC_MSG_CHECKING([if arch-OS host is AMD64-Linux/FreeBSD (to build static libraries with PIC)])
 case $host in
@@ -172,18 +171,6 @@ esac
 dnl libtool setup
 AC_PROG_LIBTOOL
 
-AC_MSG_CHECKING([if we need -no-undefined])
-case $host in
-  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc*)
-    need_no_undefined=yes
-    ;;
-  *)
-    need_no_undefined=no
-    ;;
-esac
-AC_MSG_RESULT($need_no_undefined)
-AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)
-
 AC_MSG_CHECKING([if we need -mimpure-text])
 mimpure=no
 case $host in
@@ -270,6 +257,12 @@ esac
 CURL_CHECK_COMPILER_HALT_ON_ERROR
 CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
 
+CURL_CHECK_NO_UNDEFINED
+AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)
+
+CURL_CHECK_CURLDEBUG
+AM_CONDITIONAL(CURLDEBUG, test x$want_curldebug = xyes)
+
 dnl **********************************************************************
 dnl Compilation based checks should not be done before this point.
 dnl **********************************************************************
@@ -2520,7 +2513,8 @@ squeeze CURL_LIBS
 squeeze LIBCURL_LIBS
 squeeze TEST_SERVER_LIBS
 
-if test "x$want_debug" = "xyes" && test "x$HAVE_ARES" = "x1"; then
+if test "x$want_curldebug_assumed" = "xyes" &&
+  test "x$want_curldebug" = "xyes" && test "x$HAVE_ARES" = "x1"; then
   ac_configure_args="$ac_configure_args --enable-curldebug"
 fi
 

m4/curl-compilers.m4

@@ -22,7 +22,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 51
+# serial 52
 
 
 dnl CURL_CHECK_COMPILER
@@ -1076,22 +1076,82 @@ squeeze() {
 ])
 
 
-dnl CURL_PROCESS_DEBUG_BUILD_OPTS
+dnl CURL_CHECK_CURLDEBUG
 dnl -------------------------------------------------
-dnl Settings which depend on configure's debug given
+dnl Settings which depend on configure's curldebug given
-dnl option, and further configure the build process.
+dnl option, and other additional configure pre-requisites.
-dnl Don't use this macro for compiler dependant stuff.
+dnl Actually the curl debug memory tracking feature can
+dnl only be used/enabled when libcurl is built as a static
+dnl library or as a shared one on those systems on which
+dnl shared libraries support undefined symbols.
 
-AC_DEFUN([CURL_PROCESS_DEBUG_BUILD_OPTS], [
+AC_DEFUN([CURL_CHECK_CURLDEBUG], [
-  AC_REQUIRE([CURL_CHECK_OPTION_DEBUG])dnl
   AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
-  AC_BEFORE([$0],[AC_PROG_LIBTOOL])dnl
+  supports_curldebug="unknown"
+  if test "$want_curldebug" = "yes"; then
+    if test "x$enable_shared" != "xno" &&
+      test "x$enable_shared" != "xyes"; then
+      AC_MSG_WARN([unknown enable_shared setting.])
+      supports_curldebug="no"
+    fi
+    if test "x$enable_static" != "xno" &&
+      test "x$enable_static" != "xyes"; then
+      AC_MSG_WARN([unknown enable_static setting.])
+      supports_curldebug="no"
+    fi
+    if test "$supports_curldebug" != "no"; then
+      if test "$enable_shared" = "yes" &&
+        test "$need_no_undefined" = "yes"; then
+        supports_curldebug="no"
+        AC_MSG_WARN([shared library does not support undefined symbols.])
+      fi
+    fi
+  fi
   #
-  if test "$want_debug" = "yes"; then
+  if test "$want_curldebug" = "yes"; then
+    AC_MSG_CHECKING([if curl debug memory tracking can be enabled])
+    test "$supports_curldebug" = "no" || supports_curldebug="yes"
+    AC_MSG_RESULT([$supports_curldebug])
+    if test "$supports_curldebug" = "no"; then
+      AC_MSG_WARN([cannot enable curl debug memory tracking.])
+      want_curldebug="no"
+    fi
+  fi
+  #
+  if test "$want_curldebug" = "yes"; then
     CPPFLAGS="$CPPFLAGS -DCURLDEBUG"
     squeeze CPPFLAGS
   fi
-  #
+  if test "$want_debug" = "yes"; then
+    CPPFLAGS="$CPPFLAGS -DDEBUGBUILD"
+    squeeze CPPFLAGS
+  fi
+])
+
+
+dnl CURL_CHECK_NO_UNDEFINED
+dnl -------------------------------------------------
+dnl Checks if the -no-undefined flag must be used when
+dnl building shared libraries. This is required on all
+dnl systems on which shared libraries should not have
+dnl references to undefined symbols. This check should
+dnl not be done before AC-PROG-LIBTOOL.
+
+AC_DEFUN([CURL_CHECK_NO_UNDEFINED], [
+  AC_BEFORE([$0],[CURL_CHECK_CURLDEBUG])dnl
+  AC_MSG_CHECKING([if shared libraries need -no-undefined])
+  need_no_undefined="no"
+  case $host in
+    *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc* | *-*-aix*)
+      need_no_undefined="yes"
+      ;;
+  esac
+  if test "x$allow_undefined" = "xno"; then
+    need_no_undefined="yes"
+  elif test "x$allow_undefined_flag" = "xunsupported"; then
+    need_no_undefined="yes"
+  fi
+  AC_MSG_RESULT($need_no_undefined)
 ])
 
 

m4/curl-confopts.m4

@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -22,7 +22,58 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 4
+# serial 5
+
+
+dnl CURL_CHECK_OPTION_CURLDEBUG
+dnl -------------------------------------------------
+dnl Verify if configure has been invoked with option
+dnl --enable-curldebug or --disable-curldebug, and set
+dnl shell variable want_curldebug value as appropriate.
+
+AC_DEFUN([CURL_CHECK_OPTION_CURLDEBUG], [
+  AC_BEFORE([$0],[CURL_CHECK_CURLDEBUG])dnl
+  AC_MSG_CHECKING([whether to enable curl debug memory tracking])
+  OPT_CURLDEBUG_BUILD="default"
+  AC_ARG_ENABLE(curldebug,
+AC_HELP_STRING([--enable-curldebug],[Enable curl debug memory tracking])
+AC_HELP_STRING([--disable-curldebug],[Disable curl debug memory tracking]),
+  OPT_CURLDEBUG_BUILD=$enableval)
+  case "$OPT_CURLDEBUG_BUILD" in
+    no)
+      dnl --disable-curldebug option used
+      want_curldebug="no"
+      AC_MSG_RESULT([no])
+      ;;
+    default)
+      dnl configure's curldebug option not specified. Initially we will
+      dnl handle this as a a request to use the same setting as option
+      dnl --enable-debug. IOW, initially, for debug-enabled builds
+      dnl this will be handled as a request to enable curldebug if
+      dnl possible, and for debug-disabled builds this will be handled
+      dnl as a request to disable curldebug.
+      if test "$want_debug" = "yes"; then
+        AC_MSG_RESULT([not specified (assuming yes)])
+      else
+        AC_MSG_RESULT([no])
+      fi
+      want_curldebug_assumed="yes"
+      want_curldebug="$want_debug"
+      ;;
+    *)
+      dnl --enable-curldebug option used.
+      dnl The use of this option value is a request to enable curl's
+      dnl debug memory tracking for the libcurl library. This can only
+      dnl be done when some requisites are simultaneously satisfied.
+      dnl Later on, these requisites are verified and if they are not
+      dnl not fully satisfied the option will be ignored and act as if
+      dnl --disable-curldebug had been given setting shell variable
+      dnl want_curldebug to 'no'.
+      want_curldebug="yes"
+      AC_MSG_RESULT([yes])
+      ;;
+  esac
+])
 
 
 dnl CURL_CHECK_OPTION_DEBUG
@@ -33,6 +84,7 @@ dnl variable want_debug value as appropriate.
 
 AC_DEFUN([CURL_CHECK_OPTION_DEBUG], [
   AC_BEFORE([$0],[CURL_CHECK_OPTION_WARNINGS])dnl
+  AC_BEFORE([$0],[CURL_CHECK_OPTION_CURLDEBUG])dnl
   AC_BEFORE([$0],[CURL_CHECK_PROG_CC])dnl
   AC_MSG_CHECKING([whether to enable debug build options])
   OPT_DEBUG_BUILD="default"