The build is broken when using clang on ARM. -mcx16 is being passed to clang when building natively on ARM. This combined with -Werror causes the breakage. Fix it by skipping anything related to -mcx16 when not building for x86-based architectures. See [1] for details.
[1] https://lists.linaro.org/pipermail/lng-odp/2017-April/029684.html v2 - Add more description to commit message (Dmitry) Signed-off-by: Brian Brooks <brian.bro...@arm.com> --- configure.ac | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/configure.ac b/configure.ac index 9320f360..d364b8dd 100644 --- a/configure.ac +++ b/configure.ac @@ -303,20 +303,22 @@ ODP_CFLAGS="$ODP_CFLAGS -std=c99" # Extra flags for example to suppress certain warning types ODP_CFLAGS="$ODP_CFLAGS $ODP_CFLAGS_EXTRA" -######################################################################### -# Check if compiler supports cmpxchng16 -########################################################################## -if test "${CC}" != "gcc" -o ${CC_VERSION_MAJOR} -ge 5; then - my_save_cflags="$CFLAGS" - - CFLAGS=-mcx16 - AC_MSG_CHECKING([whether CC supports -mcx16]) - AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], - [AC_MSG_RESULT([yes])] - [ODP_CFLAGS="$ODP_CFLAGS $CFLAGS"], - [AC_MSG_RESULT([no])] - ) - CFLAGS="$my_save_cflags" +########################################################################## +# Check if compiler supports cmpxchng16 on x86-based architectures +########################################################################## +if "${host}" == i?86* -o "${host}" == x86*; then + if test "${CC}" != "gcc" -o ${CC_VERSION_MAJOR} -ge 5; then + my_save_cflags="$CFLAGS" + + CFLAGS=-mcx16 + AC_MSG_CHECKING([whether CC supports -mcx16]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], + [AC_MSG_RESULT([yes])] + [ODP_CFLAGS="$ODP_CFLAGS $CFLAGS"], + [AC_MSG_RESULT([no])] + ) + CFLAGS="$my_save_cflags" + fi fi ########################################################################## -- 2.12.2
