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M4: generate synchronization lines

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This also includes Bison version check. Versions before 3.0 don't
support them in a reliable way and we don't promise to work with
versions older than 2.4.
This commit is contained in:
Jan Maria Matejka 2018-07-17 15:30:59 +02:00
parent 1279a83103
commit aaf99e5e56
4 changed files with 27 additions and 1 deletions
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1
Makefile.in
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@ -9,6 +9,7 @@ MAKEFLAGS += -r
CPPFLAGS=-I$(objdir) -I$(srcdir) @CPPFLAGS@
CFLAGS=$(CPPFLAGS) @CFLAGS@
LDFLAGS=@LDFLAGS@
M4FLAGS=@M4FLAGS@
LIBS=@LIBS@
DAEMON_LIBS=@DAEMON_LIBS@
CLIENT_LIBS=@CLIENT_LIBS@

16
aclocal.m4 vendored
View File

@ -175,3 +175,19 @@ AC_DEFUN([BIRD_CHECK_PROG_FLAVOR_GNU],
)
esac
])
AC_DEFUN([BIRD_CHECK_BISON_VERSION],
[
$1=`bison --version | ( read line; echo ${line##* } )`
case "$$1" in
1.* | 2.0* | 2.1* | 2.2* | 2.3* )
AC_MSG_ERROR([Provided Bison version $$1 is too old, need at least 2.4])
;;
2.*)
bird_bison_synclines=no
;;
3.* | 4.* | 5.* | 6.* | 7.* | 8.* | 9.* )
bird_bison_synclines=yes
;;
esac
])

2
conf/Makefile
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@ -11,7 +11,7 @@ BISON_DEBUG=-t
endif
$(conf-y-targets): $(s)confbase.Y $(s)flowspec.Y
$(M4) -P $| $^ >$@
$(M4) $(M4FLAGS) -P $| $^ >$@
$(o)cf-parse.y: | $(s)gen_parser.m4
$(o)keywords.h: | $(s)gen_keywords.m4

9
configure.ac
View File

@ -157,6 +157,15 @@ test -z "$FLEX" && AC_MSG_ERROR([Flex is missing.])
test -z "$BISON" && AC_MSG_ERROR([Bison is missing.])
test -z "$M4" && AC_MSG_ERROR([M4 is missing.])
AC_MSG_CHECKING([bison version])
BIRD_CHECK_BISON_VERSION(BISON_VERSION)
AC_MSG_RESULT([$BISON_VERSION])
if test "$bird_bison_synclines" = yes; then
M4FLAGS="$M4FLAGS -s"
fi
AC_SUBST([M4FLAGS])
BIRD_CHECK_PROG_FLAVOR_GNU([$M4],
[],
[AC_MSG_ERROR([Provided M4 is not GNU M4.])]