Public bug reported:

See log https://launchpadlibrarian.net/866539864/buildlog_ubuntu-
stonking-riscv64.openjdk-27_27~24ea-2_BUILDING.txt.gz

DFulltype=Character -Dmemtype=char -DMemtype=Char -Dstreamtype=int 
-DStreamtype=Int -DType=Char -Dx=c -DfromBits= -DtoBits= -Dswap= 
-DSwaptype=Char 
-i/<<PKGBUILDDIR>>/src/java.base/share/classes/java/nio/X-Buffer.java.template 
-o/<<PKGBUILDDIR>>/build/support/gensrc/java.base/java/nio/CharBuffer.java.tmp]
Assembler messages:
/<<PKGBUILDDIR>>/src/hotspot/os_cpu/linux_riscv/orderAccess_linux_riscv.hpp:74: 
Error: unrecognized opcode `fence.i', extension `zifencei' required
/<<PKGBUILDDIR>>/src/hotspot/os_cpu/linux_riscv/orderAccess_linux_riscv.hpp:74: 
Error: unrecognized opcode `fence.i', extension `zifencei' required

This seems to to be a result of -march changes for riscv[1]


[1] https://bugs.launchpad.net/ubuntu/+source/gcc-16/+bug/2152642

** Affects: gcc-16 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: openjdk-27 (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: gcc-16 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2158577

Title:
  openjdk-27 ftbfs on riscv

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