disabled c99 in Solaris builds

[Baesken, Matthias]

Hello , it  seems that currently the Solaris  Oracle Studio Build environment is the only one  that explicitly
forbids C99 C code  by setting  -xc99=%none .
The current Linux/Mac/AIX/Windows build envs had no issues with the coding.

For example I was running into an error with the C variable declaration order issue (small example below) today in my coding.
Is this still a wanted behavior ? What was the reason behind setting -xc99=%none , and is  the reason  still valid ?
I remember we had issues with C99 compatibility back then when VS2010  was used on Windows, but I think these  days we use VS2013+, is this correct ?

The example program  mixes declarations and "other statements" ,  which needs C99,  I compile with Oracle Studio 12u4 .

/compiler/SS12u4-Oct2017/SUNWspro/bin/cc  vardecl.c -o vardecl

No settings -> works nicely


- with C99 disabled as OpenJDK does :
----------------------------------------------------------

/compiler/SS12u4-Oct2017/SUNWspro/bin/cc -xc99=%none   vardecl.c -o vardecl
"vardecl.c", line 8: warning: declaration can not follow a statement


- with C99 disabled + errwarn as OpenJDK does :
------------------------------------------------------------------------

/compiler/SS12u4-Oct2017/SUNWspro/bin/cc -xc99=%none  -errwarn=%all  vardecl.c -o vardecl
"vardecl.c", line 8: declaration can not follow a statement
cc: acomp failed for vardecl.c

example program :
---------------------------------------

bash-3.2$ more vardecl.c
#include <stdio.h>

int main(void) {
  int a = 0;
  printf("a: %d \n", a);

  int b = 1;
  printf("b: %d \n", b);
  return 0;
}


Best regards, Matthias