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configure.ac: adjust a specific FreeBSD test for dot

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As FreeBSD uses default the csh (C-shell) or the tcsh (Tennex-shell)
with some different output redirection than bash for example, and the
user might have installed a other shell we need to grep the version from
the dot binary by a csh shell call because this shell be always available.

Happily the 'dot -V' command is quite the same on FreeBSD and Linux
systems. Maybe we need to change this in the future again.
This commit is contained in:
Carsten Schoenert authored and Olaf Bergmann committed 2016-10-26 10:46:50 +02:00
1 parent c95e1f0917
commit 87e30a4e25
1 file changed
+20 -4
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configure.ac
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@@ -165,13 +165,29 @@ if test "x$build_documentation" = "xyes"; then
HAVE_DOT="NO"
USE_CALL_GRAPH="NO"
else
AC_MSG_CHECKING([for compatible dot version])
dot_version=`$DOT -V 2>&1|$GREP -oP '(?<=version\W)@<:@0-9.@:>@*(?=\W(.*))'`
AC_MSG_CHECKING([for compatible dot version (>= 2.26.0)])
case $host in
*-freebsd1*)
# csh and tcsh have a different output redirection than more recent shells
# cmd >& file # Redirect both stdout and stderr to file.
# cmd >>& file # Append both stdout and stderr to file.
# cmd1 | cmd2 # pipe stdout to cmd2
# cmd1 |& cmd2 # pipe stdout and stderr to cmd2
# Using a explicit call with the default always available C-shell on FreeBSD,
# the user may have installed another shell from a port which we don't know here
dot_version=`export DOT=$DOT && csh -c '$DOT -V |& cut -f5 -d" "'`
;;
*)
dot_version=`$DOT -V 2>&1 | cut -f5 -d" "`
;;
esac
AS_VERSION_COMPARE([$dot_version], [2.26.0],
[AC_MSG_RESULT([no])
DOT=""],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([yes])])
[AC_MSG_RESULT([yes $dot_version])],
[AC_MSG_RESULT([yes $dot_version])])
if test "x$DOT" = "x" -a "x$build_documentation" = "xyes"; then
AC_MSG_WARN([==> Graphviz dot $dot_version too old. Graphviz 2.26+ required for documentation build.])
AC_MSG_ERROR([==> Install required graphviz version or disable the documentation using --disable-documentation])