RFR: 8325163: Enable -Wpedantic on clang

[Magnus Ihse Bursie]

On Mon, 5 Feb 2024 10:49:07 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> Shouldn't this be -pedantic -Wpedantic, and wouldn't this be better positioned at where HotSpot currently sets -permissive- for Microsoft Visual C++ (In other words, TOOLCHAIN_CFLAGS_JVM and TOOLCHAIN_CFLAGS_JDK)? The 2 options are not the same, at least on gcc, and I'm unsure if the same is true for clang

(It is really weird, I cannot find that original comment anywhere in the Github PR :-()

As far as I have been able to determine, -Wpedantic and -pedantic are aliases on gcc > 5, and the same is true for clang. -Wpedantic seems to be the preferred way nowadays.

`TOOLCHAIN_CFLAGS_JVM` is arguably if not wrong so at least not the best place to put `-permissive-`. `-Wpermissive` belongs with `-Wall -Wextra`.

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PR Comment: https://git.openjdk.org/jdk/pull/17687#issuecomment-1926861360