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Description of problem:

We need to compile upstream Mesa for RHEL6 backports, however they started using anonymous structs/unions and desginated initialisers, we realised -std=gnu99 would enable the use of anonymous unions on RHEL6, but it falls over when they are used with designated initialisers.


Version-Release number of selected component (if applicable):
gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC)

How reproducible:



Steps to Reproduce:
1.

Here is test.c:
struct foo { union { int a; }; }; 

struct foo bar = { .a = 5 };
int main(void) {struct foo f; f.a = 0; return (0);}


2.

gcc -std=gnu99 -o test test.c

Actual results:
test.c:3: error: unknown field ‘a’ specified in initializer

Expected results:

as for gcc 4.8, it should compile.

Additional info:

We really need this to work if at all possible in the system compiler as we need to build newer mesa for RHEL 6.8.

this looks like 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10676

It appears upstream Mesa has found MSVC also fails in this area, and has rewritten the code, so we probably won't require this feature at this time, though its possible it will pop up again in future, or that there are other requirements for it.

feel free to close this for now if nobody else has requested anything in this area.

Per c#3.