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build-sys: check for lz4 in the old and new numbering scheme (#4717)

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lz4 upstream decided to switch to an incompatible numbering scheme
(1.7.3 follows 131, to match the so version).
PKG_CHECK_MODULES does not allow two version matches for the same package,
so e.g. lz4 < 10 || lz4 >= 125 cannot be used. Check twice, once for
"new" numbers (anything below 10 is assume to be new), once for the "old"
numbers (anything above >= 125). This assumes that the "new" versioning
will not get to 10 to quickly. I think that's a safe assumption, lz4 is a
mature project.

Fixed #4690.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-11-23 10:18:30 -05:00 committed by Lennart Poettering
parent b0828828bb
commit 3d4cf7de48
1 changed files with 6 additions and 3 deletions
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9
configure.ac
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@ -621,10 +621,13 @@ AM_CONDITIONAL(HAVE_BZIP2, [test "$have_bzip2" = "yes"])
have_lz4=no
AC_ARG_ENABLE(lz4, AS_HELP_STRING([--disable-lz4], [disable optional LZ4 support]))
AS_IF([test "x$enable_lz4" != "xno"], [
PKG_CHECK_MODULES(LZ4, [ liblz4 >= 125 ],
[AC_DEFINE(HAVE_LZ4, 1, [Define in LZ4 is available])
PKG_CHECK_MODULES(LZ4, [ liblz4 < 10 ],
[AC_DEFINE(HAVE_LZ4, 1, [Define if LZ4 is available])
have_lz4=yes],
have_lz4=no)
[PKG_CHECK_MODULES(LZ4, [ liblz4 >= 125 ],
[AC_DEFINE(HAVE_LZ4, 1, [Define if LZ4 is available])
have_lz4=yes],
have_lz4=no)])
AS_IF([test "x$have_lz4" = xno -a "x$enable_lz4" = xyes],
[AC_MSG_ERROR([*** LZ4 support requested but libraries not found])])
])