We are trying to cross build a RISC-V version of OpenJDK. We specified `--openjdk-target=riscv64-linux-gnu` after `bash configure` but got an error message.
configure: error: /usr/bin/bash /home/ent-user/jdk_src/make/autoconf/build-aux/config.sub riscv64-linux-gnu failed configure exiting with result code 1 It shows the processing of `riscv64-linux-gnu` in script `config.sub` fails. We see `config.sub` calls another script `autoconf-config.sub` to validate and canonicalize a configuration type. The validation fails here because `autoconf-config.sub` is a quite old version and has no RISC-V support inside. Comments in those scripts tell us patching the autoconf script is not a good idea so we add a fix in `config.sub` in this patch. We have verified RISC-V cross build succeeds after this change. As we are not quite familiar with the build system, please let us know if this is the best way to fix. ------------- Commit messages: - 8285630: Fix a configure error in RISC-V cross build Changes: https://git.openjdk.java.net/jdk/pull/8420/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8420&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8285630 Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jdk/pull/8420.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8420/head:pull/8420 PR: https://git.openjdk.java.net/jdk/pull/8420
