lalr1.cc: fix test suite portability

[bison.git] / README-hacking

diff --git a/README-hacking b/README-hacking
index bb91ac063ac9cba844b42f82cb914c082350c010..506695685aebf43d53c06851935ef895eaadfb23 100644 (file)
--- a/README-hacking
+++ b/README-hacking
@@ -168,6 +168,19 @@ decide whether to update.
 ** make check
 Use liberally.
 
+** Typical errors
+If the test suite shows failures such as the following one
+
+  .../bison/lib/getopt.h:196:8: error: redefinition of 'struct option'
+  /usr/include/getopt.h:54:8: error: previous definition of 'struct option'
+
+it probably means that some file was compiled without
+AT_DATA_SOURCE_PROLOGUE.  This error is due to the fact that our -I pick up
+gnulib's replacement headers, such as getopt.h, which will go if config.h
+was not included first.
+
+See tests/local.at for details.
+
 ** make maintainer-check-valgrind
 This target uses valgrind both to check bison, and the generated parsers.