AC_SUBST(AM_CFLAGS)
+dnl--------------------------------------------------------------------------
+dnl Define language support for assembler.
+dnl
+dnl This is stolen from https://gitlab.crest.iu.edu/jsfiroz/hpx/commit/
+dnl 84be4345db6eec3797a57b8e53483cb43f4733bf
+
+AC_LANG_DEFINE([CPPAS], [cppas], [CPPAS], [CCAS], [C],
+ [ac_ext=S ac_cpp='$CPP $CPPFLAGS'
+ ac_compile='$CCAS -c $CCASFLAGS $CPPFLAGS dnl
+ conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
+ ac_link='$CCAS -oconftest$ac_exeext $CCASFLAGS $CPPFLAGS $LDFLAGS dnl
+ conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'])
+
+AC_DEFUN([AC_LANG_PREPROC(CPPAS)], [AC_REQUIRE([AC_PROG_CPP])])
+AC_DEFUN([AC_LANG_COMPILER(CPPAS)], [AC_REQUIRE([AM_PROG_AS])])
+AC_DEFUN([AC_LANG_CONFTEST(CPPAS)],
+ [cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+$1
+_ACEOF])
+
+AC_CACHE_CHECK(
+ [whether the assembler is likely to work], [mdw_cv_gnuish_as],
+ [AC_LANG_PUSH([CPPAS])
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+ .text
+ .L\$_test = 23
+.macro mymac
+ .L\$_test = .L\$_test + 1
+.endm
+ .globl foo
+ .extern bar
+ mymac]])],
+ [mdw_cv_gnuish_as=yes], [mdw_cv_gnuish_as=no])
+ AC_LANG_POP([CPPAS])])
+AM_CONDITIONAL([GNUISH_AS], [test $mdw_cv_gnuish_as = yes])
+
dnl--------------------------------------------------------------------------
dnl Host-specific configuration.
[m4_undefine([catacomb_seen_abi/$3])])])
dnl Identify the current host.
-case $host_cpu,$host_os in
- m4_define([catacomb_CPU_CASE],
- [$1) CPUFAM=$2 ABI=$3 ;;
+if test $mdw_cv_gnuish_as = no; then
+ CPUFAM=nil ABI=nil
+else
+ case $host_cpu,$host_os in
+ m4_define([catacomb_CPU_CASE],
+ [$1) CPUFAM=$2 ABI=$3 ;;
])
- catacomb_CPU_FAMILIES([catacomb_CPU_CASE])
- *) CPUFAM=nil ABI=nil ;;
-esac
+ catacomb_CPU_FAMILIES([catacomb_CPU_CASE])
+ *) CPUFAM=nil ABI=nil ;;
+ esac
+fi
dnl Figure out the current CPU.
catacomb_CPU_FAMILIES([catacomb_CLEAR_FLAGS])