RFR: 8339128: Cannot resolve user specified tool properly after JDK-8338304

[Jiangli Zhou]

On Fri, 1 Nov 2024 00:08:56 GMT, Jiangli Zhou <jiangli at openjdk.org> wrote:

> Please review this PR that fixes JDK build configure failure when using clang after JDK-8338304:
> 
> 
> Found candidate GCC installation: <snip>
> Selected GCC installation: <snip>
> ...
> clang: error: unsupported option '-V -static-libgcc'
> configure:85215: $? = 1
> configure:85204: <snip> -qversion >&5
> clang: error: unknown argument '-qversion'; did you mean '--version'?
> ...
> 
> 
> Tool from Clang GCC installation is being picked up unexpectedly (JDK build configured with `--with-toolchain-type=clang`). With this fix, it avoids `UTIL_REQUIRE_PROGS(LLD, lld)` if user supplies compiler toolchain. The user supplied compiler toolchain is used by setting `CXX=<user_specified_path_to_tools_script>` during configuration.

@MBaesken Could you help test if this change does not cause any issue in your environment? Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/21817#issuecomment-2451049329