RFR: JDK-8300068: UBSan CFLAGS/LDFLAGS not passed when building ADLC

[Justin King]

On Thu, 12 Jan 2023 18:56:38 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Fix misconfigured UBSan build by funneling `UBSAN_CFLAGS` and `UBSAN_LDFLAGS` to ADLC.
>
> make/autoconf/jdk-options.m4 line 480:
> 
>> 478:         LDFLAGS_JDKEXE="$LDFLAGS_JDKEXE $UBSAN_LDFLAGS"
>> 479:       ])
>> 480:   if test "x$UBSAN_ENABLED" = xfalse; then
> 
> You don't have to explicitly declare variables empty; I don't think we normally do that.

Mostly me being pedantic to prevent someone from accidentally referencing the variable without checking UBSAN_ENABLED.

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PR: https://git.openjdk.org/jdk/pull/11975