* Updates the to configure script.

- Added check, whether or not '-Wno-pointer-sign' can actually be used (caused warnings with g++).
- Math library is no longer considered required, when math functions are available without it (made configure fail on platforms, where no separate math library is present).

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@14749 54d463be-8e91-2dee-dedb-b68131a5f0ec

3 files changed, 141 insertions, 19 deletions

diff --git a/Changelog-Trunk.txt b/Changelog-Trunk.txt
index 7cbdfd9f4..6d7f77baa 100644
--- a/Changelog-Trunk.txt
+++ b/Changelog-Trunk.txt
@@ -1,5 +1,9 @@
 Date	Added
 
+2011/03/20
+	* Updates the to configure script. [Ai4rei]
+	- Added check, whether or not '-Wno-pointer-sign' can actually be used (caused warnings with g++).
+	- Math library is no longer considered required, when math functions are available without it (made configure fail on platforms, where no separate math library is present).
 2011/03/19
 	* Removed leftovers of old charcommand config (follow-up to r13403). [Gepard]
 	* Added check to ensure character `rename` status will be saved if changed. [Gepard]
diff --git a/configure b/configure
index 0412b30eb..5da692cf7 100755
--- a/configure
+++ b/configure
@@ -3196,8 +3196,57 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_status=$?
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; }; then
-  echo "$as_me:$LINENO: result: yes" >&5
+
+		echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+		echo "$as_me:$LINENO: checking whether $CC can actually use -Wno-pointer-sign" >&5
+echo $ECHO_N "checking whether $CC can actually use -Wno-pointer-sign... $ECHO_C" >&6
+		# This option causes warnings in C++ mode
+		# Note: -Werror must be before -Wno-pointer-sign, otherwise it does not do anything
+		CFLAGS="$OLD_CFLAGS -Werror -Wno-pointer-sign"
+		cat >conftest.$ac_ext <<_ACEOF
+int foo;
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+				echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
+				CFLAGS="$OLD_CFLAGS -Wno-pointer-sign"
+
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+				echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+
 else
   echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
@@ -4702,14 +4751,13 @@ fi
 #
 # math library (required)
 #
-
-echo "$as_me:$LINENO: checking for sqrt in -lm" >&5
-echo $ECHO_N "checking for sqrt in -lm... $ECHO_C" >&6
-if test "${ac_cv_lib_m_sqrt+set}" = set; then
+echo "$as_me:$LINENO: checking for library containing sqrt" >&5
+echo $ECHO_N "checking for library containing sqrt... $ECHO_C" >&6
+if test "${ac_cv_search_sqrt+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lm  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
+ac_cv_search_sqrt=no
 cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
@@ -4754,25 +4802,78 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   ac_status=$?
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; }; then
-  ac_cv_lib_m_sqrt=yes
+  ac_cv_search_sqrt="none required"
 else
   echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-ac_cv_lib_m_sqrt=no
 fi
 rm -f conftest.err conftest.$ac_objext \
       conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-echo "$as_me:$LINENO: result: $ac_cv_lib_m_sqrt" >&5
-echo "${ECHO_T}$ac_cv_lib_m_sqrt" >&6
-if test $ac_cv_lib_m_sqrt = yes; then
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBM 1
+if test "$ac_cv_search_sqrt" = no; then
+  for ac_lib in m; do
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
 _ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
-  LIBS="-lm $LIBS"
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char sqrt ();
+int
+main ()
+{
+sqrt ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_search_sqrt="-l$ac_lib"
+break
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+  done
+fi
+LIBS=$ac_func_search_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_search_sqrt" >&5
+echo "${ECHO_T}$ac_cv_search_sqrt" >&6
+if test "$ac_cv_search_sqrt" != no; then
+  test "$ac_cv_search_sqrt" = "none required" || LIBS="$ac_cv_search_sqrt $LIBS"
 
 else
   { { echo "$as_me:$LINENO: error: math library not found... stopping" >&5
diff --git a/configure.in b/configure.in
index afc35ee3a..c659ad142 100644
--- a/configure.in
+++ b/configure.in
@@ -318,7 +318,24 @@ OLD_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -Wno-pointer-sign"
 AC_COMPILE_IFELSE(
 	[int foo;],
-	[AC_MSG_RESULT([yes])],
+	[
+		AC_MSG_RESULT([yes])
+		AC_MSG_CHECKING([whether $CC can actually use -Wno-pointer-sign])
+		# This option causes warnings in C++ mode
+		# Note: -Werror must be before -Wno-pointer-sign, otherwise it does not do anything
+		CFLAGS="$OLD_CFLAGS -Werror -Wno-pointer-sign"
+		AC_COMPILE_IFELSE(
+			[int foo;],
+			[
+				AC_MSG_RESULT([yes])
+				CFLAGS="$OLD_CFLAGS -Wno-pointer-sign"
+			],
+			[
+				AC_MSG_RESULT([no])
+				CFLAGS="$OLD_CFLAGS"
+			]
+		)
+	],
 	[
 		AC_MSG_RESULT([no])
 		CFLAGS="$OLD_CFLAGS"
@@ -555,7 +572,7 @@ AC_CHECK_HEADER([zlib.h], [], [AC_MSG_ERROR([zlib header not found, please speci
 #
 # math library (required)
 #
-AC_CHECK_LIB([m], [sqrt], [], [AC_MSG_ERROR([math library not found... stopping])])
+AC_SEARCH_LIBS([sqrt], [m], [], [AC_MSG_ERROR([math library not found... stopping])])
 
 
 #