Hello,  here is a small webrev  removing  the  2 mentioned options .

When compiling jdk/jdk on AIX (using current xlc16 / xlclang) we run into these warnings : 

warning: 1540-5200 The option "langlvl=c99vla" is not supported. : 
This option controls variable length arrays / Enables or disables support for C99-type variable length arrays. 
warning: 1540-5200 The option "langlvl=noredefmac" is not supported. : 
Controls whether a macro can be redefined without a prior #undef or undefine() statement. 

see https://www.ibm.com/support/knowledgecenter/SSGH3R_16.1.0/com.ibm.compilers.aix.doc/compiler.pdf


The mentioned options are only available with the legacy xlc (non xlclang). 
I propose to remove these options, because xlc16 / xlclang is now the default compiler. 

Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8227389

http://cr.openjdk.java.net/~mbaesken/webrevs/8227389.0/

Thanks and best regards, Matthias

I think this is fine for 14.

Cheers, Thomas

On Mon, Jul 8, 2019 at 9:23 AM Baesken, Matthias <matthias.baesken@sap.com> wrote:

Hello,   when building   jdk/jdk  on AIX  (using the current default xlc16)   I get a ton of warnings  :

warning: 1540-5200 The option "langlvl=c99vla" is not supported.
warning: 1540-5200 The option "langlvl=noredefmac" is not supported.


The 2  options seem  to be gone with the current xlc16  / xlclang++  .   I would like to remove them -  any objections ?
(removing them might be bad for older xlc  versions but I think we  probably  cannot compile with older versions  any more  ) .


Best regards, Matthias