RFR: 8255416: Investigate err_msg to detect unnecessary uses

[Aleksey Shipilev]

On Wed, 28 Oct 2020 16:46:47 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> Hi,
> 
> When a single string without formatting arguments is provided to `err_msg`, it's redundancy, as the same message could be used without any err_msg. This is a follow-up to the discussion https://github.com/openjdk/jdk/pull/812#discussion_r511784050
> 
> Please review a change that makes `err_msg` with a single string to fail compilation. 
> 
> Detected uses of err_msg with a single string were eliminated as well.

src/hotspot/share/gc/shenandoah/mode/shenandoahMode.hpp line 35:

> 33:   do {                                                                      \
> 34:     if (!(name)) {                                                          \
> 35:       const char *msg = "GC mode needs -XX:+" #name " to work correctly";   \

Please decide which way the `*` leans in this change. I prefer `const char* msg`, like in the change below.

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PR: https://git.openjdk.java.net/jdk/pull/905