+ dnl don't test for zlib under Mac -- its verson there is 1.1.3 but we
+ dnl should still use it because hopefully (can someone confirm this?)
+ dnl Apple did fix the security problem in it and not using the system
+ dnl library results in a whole bunch of warnings when linking with
+ dnl Carbon framework
+ if test "$USE_DARWIN" = 1; then
+ system_zlib_h_ok="yes"
+ else
+ dnl we have troubles with ancient zlib versions (e.g. 1.0.4 is
+ dnl known to not work) and although I don't know which is
+ dnl the minimal required version it's safer to test for 1.1.4 as
+ dnl it fixes a security problem in 1.1.3 -- and hopefully nobody
+ dnl has anything more ancient (1.1.3 was released in July 1998)
+ dnl anyhow
+ AC_CACHE_CHECK([for zlib.h >= 1.1.4], ac_cv_header_zlib_h,
+ AC_TRY_RUN(
+ [
+ dnl zlib.h defines ZLIB_VERSION="x.y.z"
+ #include <zlib.h>
+ #include <stdio.h>
+
+ dnl don't use the brackets as quotes, we need them
+ changequote(,)
+ int main()
+ {
+ FILE *f=fopen("conftestval", "w");
+ if (!f) exit(1);
+ fprintf(f, "%s",
+ ZLIB_VERSION[0] == '1' &&
+ (ZLIB_VERSION[2] > '1' ||
+ (ZLIB_VERSION[2] == '1' &&
+ ZLIB_VERSION[4] >= '4')) ? "yes" : "no");
+ exit(0);
+ }
+ changequote([,])
+ ],
+ ac_cv_header_zlib_h=`cat conftestval`,
+ ac_cv_header_zlib_h=no,
+ dnl cross-compiling: don't have an answer, try later
+ unset ac_cv_header_zlib_h
+ )
+ )
+ dnl If the test above did not come up with a value (e.g. cross
+ dnl compiling) then this should give a definitive answer
+ AC_CHECK_HEADER(zlib.h)
+
+ system_zlib_h_ok=$ac_cv_header_zlib_h
+ fi
+
+ if test "$system_zlib_h_ok" = "yes"; then
+ AC_CHECK_LIB(z, deflate, ZLIB_LINK=" -lz")
+ fi
projects / wxWidgets.git / blobdiff