Framework build fails when building for armv7 and arm64

[sarsonj]

Hi,

I am building j2objc for those platforms:

export J2OBJC_ARCHS="macosx iphone64 iphone64e watchv7k watch64 watchsimulator simulator64 maccatalyst iphone simulator"

Then I build everything:

make -j8 all_dist

The build finish with:

building JRE framework
xcodebuild -create-xcframework -output ../dist/frameworks/JRE.xcframework -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/maccatalyst/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/macosx/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/objs-iphone/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/objs-iphone64/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/objs-simulator/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/objs-simulator64/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/objs-watch64/libjre_emul.a -library /Users/sarsonj/work/git/j2objc/jre_emul/build_result/objs-watchsimulator/libjre_emul.a
Both ios-arm64 and ios-armv7 represent two equivalent library definitions.
make[1]: *** [../dist/frameworks/JRE.xcframework] Error 70
make: *** [frameworks] Error 2

I am not sure, how armv7 (32 bit) and arm64 (64) could be equivalent...

[tomball]

Fixed.

[himamis]

I am still getting this issue on master and on tag 2.8.
This is the part that fails

xcodebuild -create-xcframework -output ../dist/frameworks/JRE.xcframework -library /Users/balazs/workspace/j2objc/jre_emul/build_result/objs-iphone/libjre_emul.a -library /Users/balazs/workspace/j2objc/jre_emul/build_result/objs-iphone64/libjre_emul.a -library /Users/balazs/workspace/j2objc/jre_emul/build_result/objs-simulator/libjre_emul.a -library /Users/balazs/workspace/j2objc/jre_emul/build_result/objs-simulator64/libjre_emul.a

This is the command that I call

make -j8 frameworks

I am running this on a m1 Mac. Could this be the cause?

[tomball]

That may be the issue, but I don't have access to any M1 hardware. As you can see, all that command does is specify which libraries to include in the framework, so what's the error? Is it a problem with one of the libraries? Is the problem that one you need is missing?

To make sure the libraries aren't fat, you can run lipo -info build_result/objs-*/libjre_emul.a. That should generate the same list of libraries as used for the xcodebuild, and lipo should state each is a "Non-fat file".

[himamis]

When calling with environment

J2OBJC_ARCHS=iphone iphone64

at generating JRE frameworks

building jre_emul archs: iphone iphone64
building JRE framework
xcodebuild -create-xcframework -output ../dist/frameworks/JRE.xcframework -library /Users/balazs/workspace/j2objc2/jre_emul/build_result/objs-iphone/libjre_emul.a -library /Users/balazs/workspace/j2objc2/jre_emul/build_result/objs-iphone64/libjre_emul.a

The command is called with separate slices, but it fails with the error

Both ios-armv7 and ios-arm64 represent two equivalent library definitions.
make[1]: *** [../dist/frameworks/JRE.xcframework] Error 70
make: *** [frameworks] Error 2

xcodebuild documentation is not very helpful with this one.

[himamis]

I'm not sure if this is j2objc build issue, or xcodebuild bug/missing feature.

[tomball]

Apparently fat libraries are not to be used for iOS, watchOS, or AppleTV, but are required for macOS: https://developer.apple.com/forums/thread/666335

Apparently they didn't feel the need to document this other than in a discussion thread. 🤬