AT_BANNER([[User Actions.]])
+
+# AT_SYNCLINES_COMPILE(FILE)
+# --------------------------
+# Compile FILE expecting an error, and save in the file stdout the
+# normalized output. Ignore the exit status, since some compilers
+# (e.g. c89 on IRIX 6.5) triger warnings on `#error', instead of
+# errors.
+m4_define([AT_SYNCLINES_COMPILE],
+[AT_CHECK([$CC $CFLAGS $CPPFLAGS -c $1], [ignore], [], [stderr])
+# In case GCC displays column information, strip it down.
+#
+# input.y:4:2: #error "4" or input.y:4.2: #error "4"
+# =>
+# input.y:4: #error "4"
+#
+AT_CHECK([[sed 's/^\([^:]*:[^:.]*\)[.:][^:]*:\(.*\)$/\1:\2/' stderr]], 0, [stdout])
+])
+
# AT_TEST_SYNCLINE(TITLE, INPUT, ERROR-MSG)
# -----------------------------------------
# Check that compiling the parser produced from INPUT cause GCC
m4_define([AT_TEST_SYNCLINE],
[AT_SETUP([$1])
-# I'm not sure I can find a generic scheme to check the location
-# of an error, so we keep this for GCC only.
-AT_CHECK([test "$GCC" = yes || exit 77])
-
-AT_DATA([[input.y]],
-[$2])
-
-AT_CHECK([bison input.y -o input.c])
-AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -c], 1, [], [stderr])
-# In case GCC displays column information, strip it down.
+# It seems impossible to find a generic scheme to check the location
+# of an error. Even requiring GCC is not sufficient, since for instance
+# the version modified by Apple:
#
-# input.y:4:2: #error "4" or input.y:4.2: #error "4"
-# =>
-# input.y:4: #error "4"
+# | Reading specs from /usr/libexec/gcc/darwin/ppc/2.95.2/specs
+# | Apple Computer, Inc. version gcc-934.3, based on gcc version 2.95.2
+# | 19991024 (release) configure:2124: $? = 0
+#
+# instead of:
#
-AT_CHECK([[sed 's/^\([^:]*:[^:.]*\)[.:][^:]*:\(.*\)$/\1:\2/' stderr]],
- 0, [$3])
+# | input.y:2: #error "2"
+#
+# it reports:
+#
+# | input.y:2: "2"
+# | cpp-precomp: warning: errors during smart preprocessing, retrying in basic mode
+
+AT_DATA([syncline.c],
+[[#error "1"
+]])
+
+AT_SYNCLINES_COMPILE([syncline.c])
+AT_CHECK([[test "`cat stdout`" = 'syncline.c:1: @%:@error "1"' || exit 77]])
+
+AT_DATA([[input.y]], [$2])
+AT_CHECK([bison -o input.c input.y])
+AT_SYNCLINES_COMPILE([input.c])
+AT_CHECK([cat stdout], 0, [$3])
AT_CLEANUP
])