RFR: 8224087: Compile C code for at least C99 Standard compliance

[Sergey Bylokhov]

Hi, David.
Should not the minimum version of c standard mentioned in the doc/building.html?

On 20/05/2019 00:40, David Holmes wrote:
> Bug: https://bugs.openjdk.java.net/browse/JDK-8224087
> webrev: http://cr.openjdk.java.net/~dholmes/8224087/webrev/
> 
> The need to remove a for-loop declaration expression to appease gcc 4.8 annoyed me enough to investigate setting C99 as our minimum allow C-language level when compiling. It turned out to be a lot more complex a situation than I thought due to toolchain quirks. See lots of details in the bug report.
> 
> To summarise the changes:
> - gcc: force to -std=gnu99
> - clang force to -std=gnu99
> - Solaris studio - no effective change
> - Visual Studio - no change
> - xlc - no effective change (but we use the explicit flag rather than accepting it as default)
> 
> I've checked how this works with all the toolchains except xlc as I have no access to that. Some assistance from someone who can verify the correctness on xlc would be appreciated.
> 
> Thanks,
> David


-- 
Best regards, Sergey.