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-Werror: fix for rules useless in parser after conflicts.

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* NEWS (2.4.3): Document fix.
* src/complain.c (error_message): Extend to handle incomplete
error messages so warn and warn_at can be used in more cases.
* src/gram.c (grammar_rules_useless_report): Use warn_at so that
-Werror is always obeyed.
* src/reduce.c (reduce_print): Use warn so that the "warnings
being treated as errors" message is printed consistently before
the first warning message.  This makes testing easier.
* tests/local.at (AT_BISON_WERROR_MSG): New macro.
(AT_BISON_CHECK_NO_XML): Extend to check -Werror and
--warnings=error when warnings appear in bison's stderr.
(cherry picked from commit 954474bfa1)
This commit is contained in:
Joel E. Denny
2010-08-01 18:51:46 -04:00
parent 20be2f9227
commit 2bfcac9a2b
6 changed files with 106 additions and 24 deletions
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65
tests/local.at
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@@ -257,11 +257,17 @@ $2])
#
# 2. In the case of maintainer-xml-check, XML/XSLT output is compared with
# --graph and --report=all output for every working grammar.
#
# 3. If stderr contains a warning, -Werror and --warnings=error
# convert the warning to an error.
m4_define([AT_BISON_CHECK],
[m4_if(m4_quote($2), [0], [AT_BISON_CHECK_XML($@)],
m4_quote($2), [], [AT_BISON_CHECK_XML($@)])
AT_BISON_CHECK_NO_XML($@)])
m4_define([AT_BISON_WERROR_MSG],
[[bison: warnings being treated as errors]])
# AT_BISON_CHECK_NO_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
# --------------------------------------------------------
# Same as AT_BISON_CHECK except don't perform XML/XSLT checks. This is useful
@@ -269,7 +275,64 @@ AT_BISON_CHECK_NO_XML($@)])
# handle.
m4_define([AT_BISON_CHECK_NO_XML],
[AT_CHECK(m4_if(m4_quote($2), [0], [], m4_quote($2), [], [],
[AT_QUELL_VALGRIND ])[[bison ]]$@)])
[AT_QUELL_VALGRIND ])[[bison ]]$@)
m4_if(m4_bregexp([$4], [: warning: ]), [-1], [],
[m4_if(m4_quote(m4_if(m4_quote($2), [], [0], [$2])), [0],
[[# Don't interfere with caller's files.
if test -f stderr; then
mv stderr at-bison-check-stderr.bak
fi
if test -f experr; then
mv experr at-bison-check-experr.bak
fi
# Run with -Werror.
]AT_CHECK(AT_QUELL_VALGRIND[[ bison -Werror ]$1],
[[1]], [$3], [stderr])[
# Build expected stderr up to and including the "warnings
# being treated as errors" message.
]AT_DATA([[at-bison-check-warnings]], [$4])[
at_bison_check_first="` \
sed -n '/: warning: /=' at-bison-check-warnings \
| sed -n 1p \
`"
if test $at_bison_check_first -gt 1; then
sed -n "1,`expr $at_bison_check_first - 1`"p \
at-bison-check-warnings > experr
fi
echo ']AT_BISON_WERROR_MSG[' >> experr
# Finish building expected stderr and check. Unlike
# warnings, complaints cause bison to exit early. Thus,
# with -Werror, bison does not necessarily report all
# warnings that it does without -Werror, but it at least
# reports one.
at_bison_check_last="`sed -n '$=' stderr`"
if test x"$at_bison_check_last" = x; then
at_bison_check_last=1
fi
at_bison_check_last="`expr $at_bison_check_last - 1`"
sed -n "$at_bison_check_first,$at_bison_check_last"p \
at-bison-check-warnings >> experr
]AT_CHECK([[sed 's,.*/\(]AT_BISON_WERROR_MSG[\)$,\1,' \
stderr 1>&2]], [[0]], [[]], [experr])[
# Now check --warnings=error.
cp stderr experr
]AT_CHECK(AT_QUELL_VALGRIND[[ bison --warnings=error ]$1],
[[1]], [$3], [experr])[
# Restore caller's files.
if test -f at-bison-check-experr.bak; then
mv at-bison-check-experr.bak experr
fi
if test -f at-bison-check-stderr.bak; then
mv at-bison-check-stderr.bak stderr
fi
]])
])
])
# AT_BISON_CHECK_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
# -----------------------------------------------------