Detect if the compiler can support the ifunc attribute, the avx2 optimization depends on ifunc attribute.
Signed-off-by: Liang Li <liang.z...@intel.com> --- configure | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/configure b/configure index b9552fd..394db3b 100755 --- a/configure +++ b/configure @@ -310,6 +310,7 @@ smartcard="" libusb="" usb_redir="" opengl="" +ifunc="" zlib="yes" lzo="" snappy="" @@ -1827,6 +1828,20 @@ EOF fi ########################################## +# ifunc check + +cat > $TMPC << EOF +static void bar(void) {} +static void foo(void) __attribute__((ifunc("bar"))); +int main(void) { foo(); return 0; } +EOF +if compile_prog "" "" ; then + ifunc="yes" +else + ifunc="no" +fi + +######################################### # zlib check if test "$zlib" != "no" ; then @@ -4837,6 +4852,7 @@ echo "libssh2 support $libssh2" echo "TPM passthrough $tpm_passthrough" echo "QOM debugging $qom_cast_debug" echo "vhdx $vhdx" +echo "ifunc support $ifunc" echo "lzo support $lzo" echo "snappy support $snappy" echo "bzip2 support $bzip2" @@ -5221,6 +5237,10 @@ if test "$opengl" = "yes" ; then echo "OPENGL_LIBS=$opengl_libs" >> $config_host_mak fi +if test "$ifunc" = "yes" ; then + echo "CONFIG_IFUNC=y" >> $config_host_mak +fi + if test "$lzo" = "yes" ; then echo "CONFIG_LZO=y" >> $config_host_mak fi -- 1.9.1