build: fix __builtin_expect detection for clang
Using AC_CHECK_DECL, the generated test tries to cast the function to void. Clang doesn't allow that for builtins.
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@ -103,7 +103,11 @@ AC_ARG_WITH([scalar], [AS_HELP_STRING([--with-scalar=64bit|32bit|auto],
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AC_CHECK_TYPES([__int128])
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AC_CHECK_DECL(__builtin_expect,AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]),,)
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AC_MSG_CHECKING([for __builtin_expect])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void myfunc() {__builtin_expect(0,0);}]])],
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[ AC_MSG_RESULT([yes]);AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]) ],
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[ AC_MSG_RESULT([no])
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])
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if test x"$req_field" = x"auto"; then
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SECP_64BIT_ASM_CHECK
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