Attributes of Blocks and Control-Flow Statements.
__attribute__((attr1)) {...}
For basic blocks and control-flow-statements the attribute is placed before the structure in question, for example:
__attribute__((attr1)) {...}
for __attribute__((attr2)) (...) __attribute__((attr3)) {...}
Here attr1 applies to the block in braces and attr2 and attr3 apply to the loop’s control construct and body, respectively.
No attribute qualifiers for blocks and control-flow-statements are currently defined.