From 32f330f7a464dc87be4e79b21b1ea3f35e9f143b Mon Sep 17 00:00:00 2001 From: "kenton@google.com" Date: Tue, 15 Sep 2009 17:15:43 +0000 Subject: Detect whether zlib is new enough. Based on patch from Oliver Jowett. --- configure.ac | 38 +++++++++++++++++++++++++++++++------- 1 file changed, 31 insertions(+), 7 deletions(-) (limited to 'configure.ac') diff --git a/configure.ac b/configure.ac index 754a190f..eb81a7eb 100644 --- a/configure.ac +++ b/configure.ac @@ -82,14 +82,38 @@ AC_FUNC_MEMCMP AC_FUNC_STRTOD AC_CHECK_FUNCS([ftruncate memset mkdir strchr strerror strtol]) +# Check for zlib. HAVE_ZLIB=0 -AS_IF([test "$with_zlib" != no], - [AC_SEARCH_LIBS([zlibVersion], [z], - [AC_DEFINE([HAVE_ZLIB], [1], [Enable classes using zlib compression.]) - HAVE_ZLIB=1], - [if test "$with_zlib" != check; then - AC_MSG_FAILURE([--with-zlib was given, but test for zlib failed]) - fi])]) +AS_IF([test "$with_zlib" != no], [ + AC_MSG_CHECKING([zlib version]) + + # First check the zlib header version. + AC_COMPILE_IFELSE( + AC_LANG_PROGRAM([[ + #include + #if !defined(ZLIB_VERNUM) || (ZLIB_VERNUM < 0x1204) + # error zlib version too old + #endif + ]], []), [ + AC_MSG_RESULT([ok (1.2.0.4 or later)]) + + # Also need to add -lz to the linker flags and make sure this succeeds. + AC_SEARCH_LIBS([zlibVersion], [z], [ + AC_DEFINE([HAVE_ZLIB], [1], [Enable classes using zlib compression.]) + HAVE_ZLIB=1 + ], [ + AS_IF([test "$with_zlib" != check], [ + AC_MSG_FAILURE([--with-zlib was given, but no working zlib library was found]) + ]) + ]) + ], [ + AS_IF([test "$with_zlib" = check], [ + AC_MSG_RESULT([headers missing or too old (requires 1.2.0.4)]) + ], [ + AC_MSG_FAILURE([--with-zlib was given, but zlib headers were not present or were too old (requires 1.2.0.4)]) + ]) + ]) +]) AM_CONDITIONAL([HAVE_ZLIB], [test $HAVE_ZLIB = 1]) AS_IF([test "$with_protoc" != "no"], [ -- cgit v1.2.3