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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.
This commit is contained in:
Cory Fields 2014-12-08 19:08:49 -05:00
parent aaba2e0f4b
commit 1f46b006b7
1 changed files with 5 additions and 1 deletions
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6
configure.ac
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@ -103,7 +103,11 @@ AC_ARG_WITH([scalar], [AS_HELP_STRING([--with-scalar=64bit|32bit|auto],
AC_CHECK_TYPES([__int128])
AC_CHECK_DECL(__builtin_expect,AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]),,)
AC_MSG_CHECKING([for __builtin_expect])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void myfunc() {__builtin_expect(0,0);}]])],
[ AC_MSG_RESULT([yes]);AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]) ],
[ AC_MSG_RESULT([no])
])
if test x"$req_field" = x"auto"; then
SECP_64BIT_ASM_CHECK