This commit adds the `-fno-delete-null-pointer-checks` compiler option to clang builds, which is going to become necessary starting from clang version 12.0.0 (see the [bug report](https://bugs.openjdk.java.net/browse/JDK-8265431) for more info).
Verified on Linux (with both gcc and clang toolchains) and MacOS (with only the clang toolchain) by - Running configure with `--with-toolchain-type=clang`; the following appears in the configure output: ... checking if BUILD_CC supports "-fno-delete-null-pointer-checks"... yes checking if BUILD_CXX supports "-fno-delete-null-pointer-checks"... yes checking if both BUILD_CC and BUILD_CXX support "-fno-delete-null-pointer-checks"... yes ... * Toolchain: clang (clang/LLVM) * C Compiler: Version 10.0.0 (at /usr/bin/clang) * C++ Compiler: Version 10.0.0 (at /usr/bin/clang++) - Successfully building `make images`. The option is actually passed down to the compiler: $ grep fno-delete-null-pointer-checks .../jdk/build/linux-x86_64-server-release/hotspot/variant-server/libjvm/objs/*cmdline | wc -l 1069 - Running `make run-test-tier1` on Linux. ------------- Commit messages: - 8265431: Add -fdelete-null-pointer-checks to clang builds Changes: https://git.openjdk.java.net/jdk/pull/4166/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4166&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8265431 Stats: 9 lines in 1 file changed: 9 ins; 0 del; 0 mod Patch: https://git.openjdk.java.net/jdk/pull/4166.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/4166/head:pull/4166 PR: https://git.openjdk.java.net/jdk/pull/4166
