AX_GCC_FUNC_ATTRIBUTE(ATTRIBUTE)
This macro checks if the compiler supports one of GCC’s function attributes; many other compilers also provide function attributes with the same syntax. Compiler warnings are used to detect supported attributes as unsupported ones are ignored by default so quieting warnings when using this macro will yield false positives.
The ATTRIBUTE parameter holds the name of the attribute to be checked.
If ATTRIBUTE is supported define HAVE_FUNC_ATTRIBUTE_<ATTRIBUTE>.
The macro caches its result in the ax_cv_have_func_attribute_<attribute> variable.
The macro currently supports the following function attributes:
alias aligned alloc_size always_inline artificial cold const constructor constructor_priority for constructor attribute with priority deprecated destructor dllexport dllimport error externally_visible fallthrough flatten format format_arg gnu_format gnu_inline hot ifunc leaf malloc noclone noinline nonnull noreturn nothrow optimize pure sentinel sentinel_position unused used visibility warning warn_unused_result weak weakref
Unsupported function attributes will be tested with a prototype returning an int and not accepting any arguments and the result of the check might be wrong or meaningless so use with care.
Download the latest version of ax_gcc_func_attribute.m4 or browse the macro’s revision history.
Copyright © 2013 Gabriele Svelto gabriele.svelto@gmail.com
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty.