Merge changes from gnulib. This was prompted because the CVS

[bison.git] / m4 / error.m4

diff --git a/m4/error.m4 b/m4/error.m4
index 3fddb5c1115509baa246f7db9518c180c5976deb..99e9cf0031ffd13c85a6abdd2471827ae3071917 100644 (file)
--- a/m4/error.m4
+++ b/m4/error.m4
@@ -1,13 +1,20 @@
-#serial 4
+#serial 5
 
-dnl FIXME: put these prerequisite-only *.m4 files in a separate
-dnl directory -- otherwise, they'll conflict with existing files.
+AC_DEFUN([gl_ERROR],
+[
+  AC_FUNC_ERROR_AT_LINE
+  dnl Note: AC_FUNC_ERROR_AT_LINE does AC_LIBSOURCES([error.h, error.c]).
+  if test $ac_cv_lib_error_at_line = no; then
+    jm_PREREQ_ERROR
+  fi
+])
 
-dnl These are the prerequisite macros for GNU's error.c file.
+# Prerequisites of lib/error.c.
 AC_DEFUN([jm_PREREQ_ERROR],
 [
-  AC_CHECK_FUNCS(strerror vprintf doprnt)
+  AC_REQUIRE([AC_HEADER_STDC])
+  AC_CHECK_FUNCS_ONCE(doprnt vprintf)
+  AC_CHECK_FUNCS(strerror)
   AC_CHECK_DECLS([strerror])
   AC_FUNC_STRERROR_R
-  AC_HEADER_STDC
 ])