configure.ac: Check that the chosen assembler will actually work.

[catacomb] / configure.ac

diff --git a/configure.ac b/configure.ac
index f5d004f..1802a8a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -47,6 +47,43 @@ AC_PROG_YACC
 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.
 
 AC_MSG_CHECKING([CPU family and ABI])
@@ -71,13 +108,17 @@ m4_ifdef([catacomb_seen_abi/$3],
          [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])