openjdk21 @21.0.4+7: invalid or unsupported format for signature

[sambthompson (Sam Thompson)]

After fixes for ticket:71049 landed, ​build of openjdk21 on 10.12 fails with:

...
Compiling up to 17 files for BUILD_JAVAC_SERVER
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_java_openjdk21/openjdk21/work/jdk-21.0.4+7/build/release/hotspot/variant-server/tools/adlc/adlc: invalid or unsupported format for signature
gmake[3]: *** [gensrc/GensrcAdlc.gmk:78: /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_java_openjdk21/openjdk21/work/jdk-21.0.4+7/build/release/hotspot/variant-server/tools/adlc/adlc] Error 1
...

Not a lot of hits for this error, but seems to come from codesign tool.

[sambthompson (Sam Thompson)]

Same error for ​openjdk17 on 10.12, and ​openjdk17 on 10.13.

A variation for ​openjdk21 on 10.13:

error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate: can't write output file: /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_java_openjdk21/openjdk21/work/jdk-21.0.4+7/build/release/support/modules_libs/java.base/server/libjvm.dylib.cstemp (Invalid argument)
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_java_openjdk21/openjdk21/work/jdk-21.0.4+7/build/release/support/modules_libs/java.base/server/libjvm.dylib: the codesign_allocate helper tool cannot be found or used
gmake[3]: *** [lib/CompileJvm.gmk:151: /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_java_openjdk21/openjdk21/work/jdk-21.0.4+7/build/release/support/modules_libs/java.base/server/libjvm.dylib] Error 1

Looks related, but can split to new ticket if preferred.

[breun (Nils Breunese)]

I wouldn't know how to troubleshoot this, but OpenJDK has only a few ​supported build platforms, so it's very possible that it won't work on these older OS versions.

If you can't build OpenJDK from source, I would recommend trying to a prebuilt binary OpenJDK distribution like Azul Zulu (openjdk21-zulu), Eclipse Temurin (openjdk21-temurin), Amazon Corretto (openjdk21-corretto), SapMachine (openjdk21-sap) or Microsoft OpenJDK (openjdk21-microsoft). Although these may also not support these older OS versions. OS version requirements may be lower for older OpenJDK versions though.