Add ./configure option to create release build.

configure

@@ -626,6 +626,8 @@ CPU_X86_64_FALSE
 CPU_X86_64_TRUE
 CPU_I386_FALSE
 CPU_I386_TRUE
+RELEASE_BUILD_FALSE
+RELEASE_BUILD_TRUE
 am__fastdepCXX_FALSE
 am__fastdepCXX_TRUE
 CXXDEPMODE
@@ -703,6 +705,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -727,6 +730,7 @@ ac_user_opts='
 enable_option_checking
 enable_silent_rules
 enable_dependency_tracking
+enable_release_build
 enable_debug
 enable_networking
 enable_alsa
@@ -794,6 +798,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1046,6 +1051,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1183,7 +1197,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1336,6 +1350,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1380,6 +1395,7 @@ Optional Features:
                           do not reject slow dependency extractors
   --disable-dependency-tracking
                           speeds up one-time build
+  --enable-release-build  build for release
   --enable-debug          build debug executable
   --enable-networking     enable networking
   --enable-alsa           use ALSA for MIDI
@@ -4121,6 +4137,29 @@ fi
 
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build for release" >&5
+$as_echo_n "checking whether to build for release... " >&6; }
+# Check whether --enable-release_build was given.
+if test "${enable_release_build+set}" = set; then :
+  enableval=$enable_release_build;
+fi
+
+if test "$enable_release_build" = "yes"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+ if test "$enable_release_build" = "yes"; then
+  RELEASE_BUILD_TRUE=
+  RELEASE_BUILD_FALSE='#'
+else
+  RELEASE_BUILD_TRUE='#'
+  RELEASE_BUILD_FALSE=
+fi
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable debugging" >&5
 $as_echo_n "checking whether to enable debugging... " >&6; }
 # Check whether --enable-debug was given.
@@ -4423,8 +4462,8 @@ fi
   if test "x$sdl_prefix$sdl_exec_prefix" = x ; then
 
 pkg_failed=no
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for sdl2 >= $min_sdl_version" >&5
-$as_echo_n "checking for sdl2 >= $min_sdl_version... " >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for SDL" >&5
+$as_echo_n "checking for SDL... " >&6; }
 
 if test -n "$SDL_CFLAGS"; then
     pkg_cv_SDL_CFLAGS="$SDL_CFLAGS"
@@ -4464,7 +4503,7 @@ fi
 
 
 if test $pkg_failed = yes; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 
 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
@@ -4482,7 +4521,7 @@ fi
 
 	sdl_pc=no
 elif test $pkg_failed = untried; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 	sdl_pc=no
 else
@@ -5585,6 +5624,10 @@ if test -z "${am__fastdepCXX_TRUE}" && test -z "${am__fastdepCXX_FALSE}"; then
   as_fn_error $? "conditional \"am__fastdepCXX\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${RELEASE_BUILD_TRUE}" && test -z "${RELEASE_BUILD_FALSE}"; then
+  as_fn_error $? "conditional \"RELEASE_BUILD\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${CPU_I386_TRUE}" && test -z "${CPU_I386_FALSE}"; then
   as_fn_error $? "conditional \"CPU_I386\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
@@ -6755,3 +6798,4 @@ if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
 fi
+