RealView Compilation Tools Compiler Reference Guide - ARM ...

Language Extensions
3.7.5 Character escape sequences
In strings, the escape sequence ‘\e’ is accepted for the escape character (ASCII
27).
Example
void foo(void)
{
printf("Escape sequence is: \e\n");
}
3.7.6 Compound literals
As in C99, compound literals are supported. All compound literals are lvalues.
Example
int y[] = (int []) {1, 2, 3}; // error in strict C99, okay in C99 --gnu
int z[] = (int [3]) {1};
Mode
Supported in GNU mode for C90 and C99 only.
Note
Compound literals can also be used as initializers in C99. However, the compiler is
more relaxed about which compound literals it accepts as initializers in GNU mode than
it is when compiling C99 source code.
3.7.7 Designated inits
As in C99, designated initializers are supported.
Example
int a[6] = { [4] = 29, [2] = 15 };
int b[6] = { 0,0,15,0,29,0 }; // a[] is equivalent to b[]
Mode
Supported in GNU mode for C90 and C++ only.
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