diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/extend.texi | 23 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 13 |
2 files changed, 30 insertions, 6 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 882c082..30eae4b 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -1131,6 +1131,14 @@ such an initializer, as shown here: char **foo = (char *[]) @{ "x", "y", "z" @}; @end smallexample +As a GNU extension, GCC allows compound literals with a variable size. +In this case, only empty initialization is allowed. + +@smallexample +int n = 4; +char (*p)[n] = &(char[n])@{ @}; +@end smallexample + Compound literals for scalar types and union types are also allowed. In the following example the variable @code{i} is initialized to the value @code{2}, the result of incrementing the unnamed object created by @@ -7311,11 +7319,16 @@ the attribute. When the field that represents the number of the elements is assigned a negative integer value, the compiler treats the value as zero. -The @code{counted_by} attribute is not allowed for a pointer to @code{void}, -a pointer to function, or a pointer to a structure or union that includes -a flexible array member. However, it is allowed for a pointer to -non-void incomplete structure or union types, as long as the type could -be completed before the first reference to the pointer. +The @code{counted_by} attribute is not allowed for a pointer to function, +or a pointer to a structure or union that includes a flexible array member. +However, it is allowed for a pointer to non-void incomplete structure +or union types, as long as the type could be completed before the first +reference to the pointer. + +The attribute is allowed for a pointer to @code{void}. However, +warnings will be issued for such cases when @option{-Wpointer-arith} is +specified. When this attribute is applied on a pointer to @code{void}, +the size of each element of this pointer array is treated as 1. An explicit @code{counted_by} annotation defines a relationship between two objects, @code{p->array} and @code{p->count}, and there are the diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index b40fc89..32b9c48 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -1097,7 +1097,7 @@ Objective-C and Objective-C++ Dialects}. -mfpu=@var{fpu-type} -msimd=@var{simd-type} -msoft-float -msingle-float -mdouble-float -mlsx -mno-lsx -mlasx -mno-lasx -mbranch-cost=@var{n} -maddr-reg-reg-cost=@var{n} -mcheck-zero-division --mno-check-zero-division +-mno-check-zero-division -mbreak-code=@var{code} -mcond-move-int -mno-cond-move-int -mcond-move-float -mno-cond-move-float -memcpy -mno-memcpy -mstrict-align -mno-strict-align -G @var{num} @@ -28457,6 +28457,17 @@ Trap (do not trap) on integer division by zero. The default is @option{-mcheck-zero-division} for @option{-O0} or @option{-Og}, and @option{-mno-check-zero-division} for other optimization levels. +@opindex mbreak-code +@item -mbreak-code=@var{code} +Emit a @code{break} @var{code} instruction for irrecoverable traps +from @code{__builtin_trap} or inserted by the compiler (for example +an erroneous path isolated with +@option{-fisolate-erroneous-paths-dereference}), or an +@code{amswap.w $r0, $r1, $r0} instruction which will cause the hardware +to trigger an Instruction Not-defined Exception if @var{code} is negative +or greater than 32767. The default is -1, meaning to use the +@code{amswap.w} instruction. + @opindex mcond-move-int @item -mcond-move-int @itemx -mno-cond-move-int |