[jdk18] RFR: 8279702: [macosx] ignore xcodebuild warnings on M1

[Andrew Haley]

On Fri, 14 Jan 2022 09:18:43 GMT, Johannes Bechberger <duke at openjdk.java.net> wrote:

>> make/autoconf/toolchain.m4 line 237:
>> 
>>> 235:     if test -n "$XCODEBUILD"; then
>>> 236:       # On Mac OS X, default toolchain to clang after Xcode 5
>>> 237:       XCODE_VERSION_OUTPUT=`"$XCODEBUILD" -version 2>&1 | $HEAD -n 1`
>> 
>> What's the warning? If it is truly expected, shouldn't it go to /dev/null ?
>
> The warning is
> 
> objc[3881]: Class AMSupportURLConnectionDelegate is implemented in both /usr/lib/libauthinstall.dylib (0x1e32b6b90) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x1087e42c8). One of the two will be used. Which one is undefined.
> objc[3881]: Class AMSupportURLSession is implemented in both /usr/lib/libauthinstall.dylib (0x1e32b6be0) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x1087e4318). One of the two will be used. Which one is undefined.
> 
> as noted in the issues referenced by my bug report and we can ignore it (as build scripts of other projects do).
> 
> The problem with fully discarding the output is that there are other errors that might cause the exit code to be non-zero and in this case displaying the warning should be helpful for debugging.
> Of course one could either just remove the expected warning or only display the error output when the return code is non-zero, but these alternatives seemed to cumbersome for me (and the first alternative to error-prone).

OK. I've seen this a couple of times, and I hate warnings that can't be fixed. But it is what it is, thanks.

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PR: https://git.openjdk.java.net/jdk18/pull/95