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tools headers: Add conditional __has_builtin()
As it'll be used by the ctype.h sync with its kernel source original. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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#ifndef __LINUX_COMPILER_TYPES_H
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#define __LINUX_COMPILER_TYPES_H
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/* Builtins */
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/*
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* __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21.
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* In the meantime, to support gcc < 10, we implement __has_builtin
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* by hand.
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*/
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#ifndef __has_builtin
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#define __has_builtin(x) (0)
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#endif
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/* Compiler specific macros. */
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#ifdef __GNUC__
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#include <linux/compiler-gcc.h>
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