diff options
| -rw-r--r-- | wiretap/configure.in | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/wiretap/configure.in b/wiretap/configure.in index daabfd3842..2c315ce7bf 100644 --- a/wiretap/configure.in +++ b/wiretap/configure.in @@ -1,4 +1,4 @@ -# $Id: configure.in,v 1.14 1999/09/22 01:26:46 ashokn Exp $ +# $Id: configure.in,v 1.15 1999/09/24 06:38:22 guy Exp $ dnl Process this file with autoconf to produce a configure script. AC_INIT(wtap.c) AM_INIT_AUTOMAKE(libwtap.a, 0.0.0) @@ -33,8 +33,49 @@ if test "x$GLIB_CFLAGS" = x ; then fi dnl Checks for header files +dnl WARNING: do *NOT* check for "unistd.h" unless you work around the +dnl following problem: +dnl +dnl At least on FreeBSD 3.2, "/usr/include/zlib.h" includes +dnl "/usr/include/zconf.h", which, if HAVE_UNISTD_H is defined, +dnl #defines "z_off_t" to be "off_t", and if HAVE_UNISTD_H is +dnl not defines, #defines "z_off_t" to be "long" if it's not +dnl already #defined. +dnl +dnl In 4.4-Lite-derived systems such as FreeBSD, "off_t" is +dnl "long long int", not "long int", so the definition of "z_off_t" - +dnl and therefore the types of the arguments to routines such as +dnl "gzseek()", as declared, with prototypes, in "zlib.h" - depends +dnl on whether HAVE_UNISTD_H is defined prior to including "zlib.h"! +dnl +dnl It's not defined in the FreeBSD 3.2 "zlib", so if we include "zlib.h" +dnl after defining HAVE_UNISTD_H, we get a misdeclaration of "gzseek()", +dnl and, if we're building with "zlib" support, anything that seeks +dnl on a file may not work. +dnl +dnl Other BSDs may have the same problem, if they haven't done something +dnl such as defining HAVE_UNISTD_H in "zconf.h". +dnl +dnl If "config.h" defines HAVE_UNISTD_H - which it will, on all systems +dnl that have it, if we test for it here, and all 4.4-Lite-derived +dnl BSDs have it - then, given that "zlib.h" is included by "file.h", +dnl that means that unless we include "zlib.h" before we include +dnl "config.h", we get a misdeclaration of "gzseek()". +dnl +dnl Unfortunately, it's "config.h" that tells us whether we have "zlib" +dnl in the first place, so we don't know whether to include "zlib.h" +dnl until we include "config.h".... +dnl +dnl Fortunately, we don't use "unistd.h", so we don't need to check +dnl for it. +dnl +dnl If we ever *do* end up requiring HAVE_UNISTD_H, a fix might be to +dnl turn "file_seek()" into a subroutine, at least if HAVE_ZLIB is +dnl defined, have it take an "off_t" as its second argument, and +dnl put it into a file that doesn't require HAVE_UNISTD_H. +dnl AC_HEADER_STDC -AC_CHECK_HEADERS(unistd.h sys/time.h netinet/in.h) +AC_CHECK_HEADERS(sys/time.h netinet/in.h) dnl zlib check AC_ARG_ENABLE(zlib, |