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Supported GNU extensions
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13.1 Supported GNU extensions
Describes ARM compiler support for GNU extensions to the C and C++ languages.
Table 13-1 Supported GNU extensions
| GNU extension | Origin | Modes supported |
|---|---|---|
| 9.4 __alignof__ | GCC-Specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| Aggregate initializer elements for automatic variables | Standard C99, Standard C++. | C99, C++, GNU C90, GNU C99, GNU C++. |
| Alternate keywords | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| asm keyword a | Standard C++. | C++, GNU C90, GNU C++. |
| Assembler labels | - | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| Case ranges | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| Cast of a union | GCC-specific. | GNU C90, GNU C99. |
| Character escape sequence | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| Compound literals | Standard C99. | C99, GNU C90, GNU C99, GNU C++. |
| Conditional statements with omitted operands | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| Designated initializers | Standard C99. | C99, GNU C90, GNU C99, GNU C++. |
| Dollar signs in identifiers | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| Extended lvalues b | Standard C++. | C++, GNU C90, GNU C99, GNU C++. |
| 9.28 Function attributes | - | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.154 GNU built-in functions | - | - |
| Inline functions | Standard C99, Standard C++. | C99, C++, GNU C90, GNU C99, GNU C++. |
| Labels as values | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| Pointer arithmetic on void pointers and function pointers | GCC-specific. | GNU C90, GNU C99. |
| Statement expressions | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| Unnamed embedded structures or unions | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| 9.29 __attribute__((alias)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.56 __attribute__((aligned)) type attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.61 __attribute__((aligned)) variable attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.30 __attribute__((always_inline)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.31 __attribute__((const)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. | |
| 9.62 __attribute__((deprecated)) variable attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.33 __attribute__((destructor[(priority)])) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.34 __attribute__((format)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.35 __attribute__((format_arg(string-index))) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.36 __attribute__((malloc)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.37 __attribute__((noinline)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.38 __attribute__((no_instrument_function)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.40 __attribute__((nonnull)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.41 __attribute__((noreturn)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.43 __attribute__((nothrow)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.57 __attribute__((packed)) type attribute | GCC-specific. | GNU C90, GNU C99, GNU C++. |
| 9.64 __attribute__((packed)) variable attribute | GCC-specific. | C90, C99, GNU C90, GNU C99, GNU C++. |
| 9.45 __attribute__((pure)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.65 __attribute__((section("name"))) variable attribute | GCC-specific. | C99, GNU C90, GNU C99, GNU C++. |
| 9.47 __attribute__((sentinel)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| GCC-specific. | GNU C90, GNU C99. | |
| 9.66 __attribute__((unused)) variable attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.67 __attribute__((used)) variable attribute | GCC-specific. | C90, C99, GNU C90, GNU C99. |
| 9.68 __attribute__((visibility("visibility_type"))) variable attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.51 __attribute__((warn_unused_result)) | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.52 __attribute__((weak)) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.69 __attribute__((weak)) variable attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.53 __attribute__((weakref("target"))) function attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| 9.70 __attribute__((weakref("target"))) variable attribute | GCC-specific. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| Variadic macros | Standard C99. | C90, C99, C++, GNU C90, GNU C99, GNU C++. |
| Zero-length arrays | GCC-specific. | GNU C90, GNU C99. |
Related reference
Related information
a Only basic syntax is
supported. That is,
asm("assembly code"). GNU
extended syntax is not supported.b
Only accepted for certain values of
--gnu_version.| Non-Confidential | PDF version | ARM DUI0375H |
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