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xen: Use auto keyword as per C23
In macros it is common to declare local variables using typeof(param) in order to ensure that side effects are only evaluated once. A consequence of this is double textural expansion of the parameter, which can get out of hand very quickly with nested macros. In C23, the auto keyword has been repurposed to perform type inference. A GCC extension, __auto_type, is now available in the new toolchain baseline and avoids the double textural expansion. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Nicola Vetrini <nicola.vetrini@bugseng.com> Reviewed-by: Frediano Ziglio <frediano.ziglio@cloud.com>
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@@ -15,6 +15,7 @@
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__alignof__, __alignof: see Sections \"6.48 Alternate Keywords\" and \"6.44 Determining the Alignment of Functions, Types or Variables\" of "GCC_MANUAL".
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asm, __asm__: see Sections \"6.48 Alternate Keywords\" and \"6.47 How to Use Inline Assembly Language in C Code\" of "GCC_MANUAL".
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__attribute__: see Section \"6.39 Attribute Syntax\" of "GCC_MANUAL".
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__auto_type: see Section \"6.7 Referring to a Type with typeof\" of "GCC_MANUAL".
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__builtin_offsetof: see Section \"6.53 Support for offsetof\" of "GCC_MANUAL".
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__builtin_types_compatible_p: see Section \"6.59 Other Built-in Functions Provided by GCC\" of "GCC_MANUAL".
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__builtin_va_arg: non-documented GCC extension.
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@@ -26,6 +27,7 @@
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-name_selector+={alignof, "^(__alignof__|__alignof)$"}
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-name_selector+={asm, "^(__asm__|asm)$"}
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-name_selector+={attribute, "^__attribute__$"}
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-name_selector+={auto_type, "^__auto_type$"}
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-name_selector+={builtin_offsetof, "^__builtin_offsetof$"}
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-name_selector+={builtin_types_p, "^__builtin_types_compatible_p$"}
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-name_selector+={builtin_va_arg, "^__builtin_va_arg$"}
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@@ -39,6 +41,7 @@
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"alignof||
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asm||
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attribute||
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auto_type||
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builtin_offsetof||
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builtin_types_p||
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builtin_va_arg||
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@@ -114,6 +117,7 @@ volatile"
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-doc_end
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-doc_begin="
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ext_auto_type: see Section \"6.7 Referring to a Type with typeof\" of "GCC_MANUAL".
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ext_c_missing_varargs_arg: see Section \"6.21 Macros with a Variable Number of Arguments\" of "GCC_MANUAL".
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ext_enum_value_not_int: non-documented GCC extension.
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ext_flexible_array_in_array: see Section \"6.18 Arrays of Length Zero\" of "GCC_MANUAL".
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@@ -126,6 +130,7 @@ volatile"
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ext_return_has_void_expr: see the documentation for -Wreturn-type in Section \"3.8 Options to Request or Suppress Warnings\" of "GCC_MANUAL".
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ext_sizeof_alignof_void_type: see Section \"6.24 Arithmetic on void- and Function-Pointers\" of "GCC_MANUAL".
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"
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-name_selector+={ext_auto_type, "^ext_auto_type$"}
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-name_selector+={ext_c_missing_varargs_arg, "^ext_c_missing_varargs_arg$"}
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-name_selector+={ext_enum_value_not_int, "^ext_enum_value_not_int$"}
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-name_selector+={ext_flexible_array_in_array, "^ext_flexible_array_in_array$"}
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@@ -139,7 +144,8 @@ volatile"
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-name_selector+={ext_sizeof_alignof_void_type, "^ext_sizeof_alignof_void_type$"}
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-config=STD.diag,behavior+={c99,GCC_ARM64,
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"ext_c_missing_varargs_arg||
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"ext_auto_type||
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ext_c_missing_varargs_arg||
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ext_forward_ref_enum_def||
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ext_gnu_array_range||
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ext_gnu_statement_expr_macro||
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@@ -149,7 +155,8 @@ ext_return_has_void_expr||
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ext_sizeof_alignof_void_type"
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}
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-config=STD.diag,behavior+={c99,GCC_X86_64,
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"ext_c_missing_varargs_arg||
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"ext_auto_type||
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ext_c_missing_varargs_arg||
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ext_enum_value_not_int||
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ext_flexible_array_in_array||
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ext_flexible_array_in_struct||
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