Added a few more compiler warning options for gcc.

CHANGES

@@ -6,6 +6,9 @@
 
                                   Changelog
 
+Daniel Fandrich (16 June 2009)
+- Added a few more compiler warning options for gcc.
+
 Daniel Stenberg (16 Jun 2009)
 - Reuven Wachtfogel made curl -o - properly produce a binary output on windows
   (no newline translations). Use -B/--use-ascii if you rather get the ascii

m4/curl-compilers.m4

@@ -873,11 +873,16 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
             tmp_CFLAGS="$tmp_CFLAGS -Wdeclaration-after-statement"
           fi
           #
+          dnl Only gcc 4.2 or later
+          if test "$compiler_num" -ge "402"; then
+            tmp_CFLAGS="$tmp_CFLAGS -Wcast-align"
+          fi
           dnl Only gcc 4.3 or later
           if test "$compiler_num" -ge "403"; then
             tmp_CFLAGS="$tmp_CFLAGS -Wtype-limits -Wold-style-declaration"
             tmp_CFLAGS="$tmp_CFLAGS -Wmissing-parameter-type -Wempty-body"
             tmp_CFLAGS="$tmp_CFLAGS -Wclobbered -Wignored-qualifiers"
+            tmp_CFLAGS="$tmp_CFLAGS -Wconversion -Wno-sign-conversion -Wvla"
           fi
           #
         fi