+[foo.y: warning: conflicting outputs to file 'location.hh'
+])
+
+AT_CHECK_CONFLICTING_OUTPUT([foo.y], [], [-o foo.y],
+[foo.y: refusing to overwrite the input file 'foo.y'
+], 1)
+
+
+# AT_CHECK_OUTPUT_FILE_NAME(FILE-NAME-PREFIX, [ADDITIONAL-TESTS])
+# -----------------------------------------------------------------------------
+m4_define([AT_CHECK_OUTPUT_FILE_NAME],
+[AT_SETUP([Output file name: $1])
+
+# Skip if platform doesn't support file name. For example, Cygwin
+# doesn't support file names containing ":" or "\".
+AT_CHECK([[touch "]AS_ESCAPE([$1[.tmp]])[" || exit 77]])
+
+AT_DATA_GRAMMAR([glr.y],
+[[%glr-parser
+%code {
+ int yylex (void);
+ void yyerror (const char *);
+}
+%%
+start: {};
+]])
+AT_BISON_CHECK([-o "AS_ESCAPE([$1.c])" --defines="AS_ESCAPE([$1.h])" glr.y])
+AT_CHECK([ls "AS_ESCAPE([$1.c])" "AS_ESCAPE([$1.h])"], [], [ignore])
+AT_COMPILE([glr.o], [-c "AS_ESCAPE([$1.c])"])
+$2
+
+AT_DATA_GRAMMAR([cxx.y],
+[[%skeleton "lalr1.cc"
+%code { int yylex (yy::parser::semantic_type*); }
+%%
+start: {};
+]])
+AT_BISON_CHECK([-o "AS_ESCAPE([$1.c])" --defines="AS_ESCAPE([$1.h])" cxx.y])
+AT_CHECK([ls "AS_ESCAPE([$1.c])" "AS_ESCAPE([$1.h])"], [], [ignore])
+AT_COMPILE_CXX([cxx.o], [-c "AS_ESCAPE([$1.c])"])
+$2
+
+AT_CLEANUP