RFR: 8264650: Cross-compilation to macos/aarch64

[Erik Joelsson]

On Fri, 2 Apr 2021 16:21:52 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Please review adding necessary flags for cross-compilation on macos/x86 targeting macos/aarch64.
>> 
>> All CFLAGS, CXXFLAGS, LDFLAGS need target CPU flag `-arch arm64`.
>> This patch adds the flag along e.g `-m64`.
>> 
>> Tested:
>> * cross-compilation on macos/x86 to macos/aarch64: configure --openjdk-target=aarch64-apple-darwin
>> * native compilation on macos/aarch64
>> * native compilation on macos/x86
>
> make/autoconf/flags.m4 line 269:
> 
>> 267: 
>> 268:   if test "x$OPENJDK_TARGET_OS" = xmacosx &&
>> 269:       test "x$OPENJDK_TARGET_CPU" = xaarch64; then
> 
> Thank you for getting on this!
> For symmetry, and to enable cross compilation on both directions, can we add the necessary flag for x64 too? 
> 
> Also, I doubt it matters much, but we could also only set these flags if COMPILE_TYPE=cross.

Thinking again, it doesn't hurt to be explicit about this. Better always set these flags to avoid surprises.

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PR: https://git.openjdk.java.net/jdk/pull/3325