configure: Only enable -gdwarf-2 if -g was specified.

configure

@@ -12287,7 +12287,10 @@ $as_echo "$ac_cv_cflags__Wwrite_strings" >&6; }
 if test $ac_cv_cflags__Wwrite_strings = yes; then :
   EXTRACFLAGS="$EXTRACFLAGS -Wwrite-strings"
 fi
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -gdwarf-2" >&5
+
+    for ac_flag in $CFLAGS; do
+    case $ac_flag in
+      -g) { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -gdwarf-2" >&5
 $as_echo_n "checking whether the compiler supports -gdwarf-2... " >&6; }
 if ${ac_cv_cflags__gdwarf_2+:} false; then :
   $as_echo_n "(cached) " >&6
@@ -12312,7 +12315,7 @@ $as_echo "$ac_cv_cflags__gdwarf_2" >&6; }
 if test $ac_cv_cflags__gdwarf_2 = yes; then :
   EXTRACFLAGS="$EXTRACFLAGS -gdwarf-2"
 fi
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -gstrict-dwarf" >&5
+          { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -gstrict-dwarf" >&5
 $as_echo_n "checking whether the compiler supports -gstrict-dwarf... " >&6; }
 if ${ac_cv_cflags__gstrict_dwarf+:} false; then :
   $as_echo_n "(cached) " >&6
@@ -12336,7 +12339,9 @@ fi
 $as_echo "$ac_cv_cflags__gstrict_dwarf" >&6; }
 if test $ac_cv_cflags__gstrict_dwarf = yes; then :
   EXTRACFLAGS="$EXTRACFLAGS -gstrict-dwarf"
-fi
+fi ;;
+    esac
+  done
 
     case $host_cpu in
     *i[3456789]86*) { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -fno-omit-frame-pointer" >&5

configure.ac

@@ -1748,8 +1748,14 @@ then
   WINE_TRY_CFLAGS([-Wtype-limits])
   WINE_TRY_CFLAGS([-Wunused-but-set-parameter])
   WINE_TRY_CFLAGS([-Wwrite-strings])
-  WINE_TRY_CFLAGS([-gdwarf-2])
-  WINE_TRY_CFLAGS([-gstrict-dwarf])
+
+  dnl Default to dwarf-2 debug info
+  for ac_flag in $CFLAGS; do
+    case $ac_flag in
+      -g) WINE_TRY_CFLAGS([-gdwarf-2])
+          WINE_TRY_CFLAGS([-gstrict-dwarf]) ;;
+    esac
+  done
 
   dnl gcc-4.6+ omits frame pointers by default, breaking some copy protections
   case $host_cpu in