RFR: JDK-8081692 Configure should verify that -fstack-protector is valid

[Erik Joelsson]

Looks good to me.

/Erik

On 2015-06-03 14:33, Magnus Ihse Bursie wrote:
> Not all versions of gcc support -fstack-protector. We should check 
> that it is accepted as an argument before adding it to the flags.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8081692
> WebRev inline:
>
> diff --git a/common/autoconf/flags.m4 b/common/autoconf/flags.m4
> --- a/common/autoconf/flags.m4
> +++ b/common/autoconf/flags.m4
> @@ -338,14 +338,16 @@
>        # no adjustment
>        ;;
>      slowdebug )
> -      # Add runtime stack smashing and undefined behavior checks
> -      CFLAGS_DEBUG_OPTIONS="-fstack-protector-all --param 
> ssp-buffer-size=1"
> -      CXXFLAGS_DEBUG_OPTIONS="-fstack-protector-all --param 
> ssp-buffer-size=1"
> +      # Add runtime stack smashing and undefined behavior checks.
> +      # Not all versions of gcc support -fstack-protector
> +      STACK_PROTECTOR_CFLAG="-fstack-protector-all"
> +      FLAGS_COMPILER_CHECK_ARGUMENTS([$STACK_PROTECTOR_CFLAG], [], 
> [STACK_PROTECTOR_CFLAG=""])
> +
> +      CFLAGS_DEBUG_OPTIONS="$STACK_PROTECTOR_CFLAG --param 
> ssp-buffer-size=1"
> +      CXXFLAGS_DEBUG_OPTIONS="$STACK_PROTECTOR_CFLAG --param 
> ssp-buffer-size=1"
>        ;;
>      esac
>    fi
> -  AC_SUBST(CFLAGS_DEBUG_OPTIONS)
> -  AC_SUBST(CXXFLAGS_DEBUG_OPTIONS)
>
>    # Optimization levels
>    if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
>
> The AC_SUBST removal is just a bit of cleanup, we didn't use the 
> *_DEBUG_OPTIONS in the spec files, just later on when constructing 
> JDK_CFLAGS.
>
> /Magnus
>