diff options
| author | Lucas De Marchi <lucas.demarchi@intel.com> | 2015-02-10 00:45:11 -0200 |
|---|---|---|
| committer | Lucas De Marchi <lucas.demarchi@intel.com> | 2015-02-10 00:45:42 -0200 |
| commit | e6307200af74d1556466522216e8ae77b7c8b843 (patch) | |
| tree | 752e3ed562011f36ea380ac1ed1766974c9c1bb5 | |
| parent | ba52c77e04b0f2d5a9ebee147f4445ac8b1f2b2a (diff) | |
| download | kmod-e6307200af74d1556466522216e8ae77b7c8b843.tar.gz | |
build: check for required builtin functions
These builtins are implemented by both gcc and clang since a long time
and we don't provide fallback for them. Let the configure phase check
for them.
| -rw-r--r-- | configure.ac | 3 | ||||
| -rw-r--r-- | m4/attributes.m4 | 6 |
2 files changed, 8 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 3dde5d9..30eea86 100644 --- a/configure.ac +++ b/configure.ac @@ -47,6 +47,9 @@ AC_CHECK_FUNCS_ONCE(__xstat) AC_CHECK_FUNCS_ONCE([__secure_getenv secure_getenv]) AC_CHECK_FUNCS_ONCE([finit_module]) +CC_CHECK_FUNC_BUILTIN([__builtin_clz]) +CC_CHECK_FUNC_BUILTIN([__builtin_types_compatible_p]) + # dietlibc doesn't have st.st_mtim struct member AC_CHECK_MEMBERS([struct stat.st_mtim], [], [], [#include <sys/stat.h>]) diff --git a/m4/attributes.m4 b/m4/attributes.m4 index af17a6b..db39bf9 100644 --- a/m4/attributes.m4 +++ b/m4/attributes.m4 @@ -260,6 +260,8 @@ AC_DEFUN([CC_CHECK_FUNC_BUILTIN], [ [cc_cv_have_$1], [AC_LINK_IFELSE([AC_LANG_PROGRAM([], [ m4_case([$1], + [__builtin_clz], [$1(0)], + [__builtin_types_compatible_p], [$1(int, int)], [__builtin_expect], [$1(0, 0)] )])], [cc_cv_have_$1=yes], @@ -267,7 +269,9 @@ AC_DEFUN([CC_CHECK_FUNC_BUILTIN], [ AS_IF([test "x$cc_cv_have_$1" = "xyes"], [AC_DEFINE([HAVE_]m4_defn([UPNAME]), 1, [Define this if the compiler supports $1() function]) - $2], [$3]) + $2], + [AS_IF([test "x$3" = "x"], [AC_MSG_ERROR([*** builtin function not found: $1()])], [$3])] + ) m4_popdef([UPNAME]) ]) |