RFR: 8264650: Cross-compilation to macos/aarch64

[Erik Joelsson]

On Fri, 2 Apr 2021 13:28:31 GMT, Anton Kozlov <akozlov 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.

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