[ruby-core:116004] [Ruby master Misc#20107] Update required Oracle Solaris Studio version to 12.5

Issue #20107 has been updated by ngoto (Naohisa Goto).


I think it is OK.

Note that Oracle Developer Studio 12.6, the latest version, have severe bug that prevent to compile Ruby ([Bug:15292]). This means that it may be needed to keep support 12.5 for a long time.


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Misc #20107: Update required Oracle Solaris Studio version to 12.5
https://bugs.ruby-lang.org/issues/20107#change-105998

* Author: kddnewton (Kevin Newton)
* Status: Open
* Priority: Normal
* Assignee: ngoto (Naohisa Goto)
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Per https://www.oracle.com/us/assets/lifetime-support-hardware-301321.pdf and https://www.oracle.com/a/ocom/docs/support/advanced-customer-support/solaris-linux-vm-lsp.pdf, 12.2, 12.3, and 12.4 are all end-of-life for "extended support". We should drop these old compilers from our support suite for Ruby 3.4.0 so that we can use more of C99.

Specifically, in conjunction with bumping to Visual Studio 2015, I believe this means we can now rely on `stdbool.h`, the `restrict` keyword, `va_copy`, `snprintf`, and the `%zu` printf specifier all functioning as expected.



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