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tinc/configure.ac
Etienne Dechamps e024b7a2c5 Use git description as the tinc version. 
Instead of using a hardcoded version number in configure.ac, this makes
tinc use the live version reported by "git describe", queried on-the-fly
during the build process and regenerated for every build.

This provides several advantages:
 - Less redundancy: git is now the source of truth for version
   information, no need to store it in the repository itself.
 - Simpler release process: just creating a git tag automatically
   updates the version. No need to change files.
 - More useful version information: tinc will now display the number of
   commits since the last tag as well as the commit the binary is built
   from, following the format described in git-describe(1).

Here's an example of tincd --version output:

  tinc version release-1.1pre10-48-gc149315 (built Jun 29 2014 15:21:10, protocol 17.3)

When building directly from a release tag, this would like the following:

  tinc version release-1.1pre10 (built Jun 29 2014 15:21:10, protocol 17.3)

(Note that the format is slightly different - because of the way the
tags are named, it says "release-1.1pre10" instead of just "1.1pre10")
2014-06-29 16:57:19 +01:00

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dnl Process this file with autoconf to produce a configure script.
AC_PREREQ(2.61)
AC_INIT([tinc], [GIT])
AC_CONFIG_SRCDIR([src/tincd.c])
AC_GNU_SOURCE
AM_INIT_AUTOMAKE([check-news std-options subdir-objects -Wall])
AC_CONFIG_HEADERS([config.h])
# Enable GNU extensions.
# Define this here, not in acconfig's @TOP@ section, since definitions
# in the latter don't make it into the configure-time tests.
AC_GNU_SOURCE
AC_DEFINE([__USE_BSD], 1, [Enable BSD extensions])
dnl Checks for programs.
AC_PROG_CC_C99
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AM_PROG_CC_C_O
dnl Check and set OS
AC_CANONICAL_HOST
case $host_os in
*linux*)
linux=true
AC_DEFINE(HAVE_LINUX, 1, [Linux])
;;
*freebsd*)
bsd=true
AC_DEFINE(HAVE_FREEBSD, 1, [FreeBSD])
;;
*darwin*)
bsd=true
AC_DEFINE(HAVE_DARWIN, 1, [Darwin (MacOS/X)])
;;
*solaris*)
solaris=true
AC_DEFINE(HAVE_SOLARIS, 1, [Solaris/SunOS])
;;
*openbsd*)
bsd=true
AC_DEFINE(HAVE_OPENBSD, 1, [OpenBSD])
;;
*netbsd*)
bsd=true
AC_DEFINE(HAVE_NETBSD, 1, [NetBSD])
;;
*dragonfly*)
bsd=true
AC_DEFINE(HAVE_DRAGONFLY, 1, [DragonFly])
;;
*bsd*)
bsd=true
AC_MSG_WARN("Unknown BSD variant, tinc might not compile or work!")
AC_DEFINE(HAVE_BSD, 1, [Unknown BSD variant])
;;
*cygwin*)
cygwin=true
AC_DEFINE(HAVE_CYGWIN, 1, [Cygwin])
;;
*mingw*)
mingw=true
AC_DEFINE(HAVE_MINGW, 1, [MinGW])
LIBS="$LIBS -lws2_32 -lgdi32 -lcrypt32"
;;
*)
AC_MSG_ERROR("Unknown operating system.")
;;
esac
AC_ARG_ENABLE(uml,
AS_HELP_STRING([--enable-uml], [enable support for User Mode Linux]),
[ AS_IF([test "x$enable_uml" = "xyes"],
[ AC_DEFINE(ENABLE_UML, 1, [Support for UML])
uml=true
],
[uml=false])
],
[uml=false]
)
AC_ARG_ENABLE(vde,
AS_HELP_STRING([--enable-vde], [enable support for Virtual Distributed Ethernet]),
[ AS_IF([test "x$enable_vde" = "xyes"],
[ AC_CHECK_HEADERS(libvdeplug_dyn.h, [], [AC_MSG_ERROR([VDE plug header files not found.]); break])
AC_DEFINE(ENABLE_VDE, 1, [Support for VDE])
vde=true
],
[vde=false])
],
[vde=false]
)
AC_ARG_ENABLE(tunemu,
AS_HELP_STRING([--enable-tunemu], [enable support for the tunemu driver]),
[ AS_IF([test "x$enable_tunemu" = "xyes"],
[ AC_DEFINE(ENABLE_TUNEMU, 1, [Support for tunemu])
tunemu=true
],
[tunemu=false])
],
[tunemu=false]
)
AC_ARG_WITH(windows2000,
AS_HELP_STRING([--with-windows2000], [compile with support for Windows 2000. This disables support for tunneling over existing IPv6 networks.]),
[ AS_IF([test "x$with_windows2000" = "xyes"],
[AC_DEFINE(WITH_WINDOWS2000, 1, [Compile with support for Windows 2000])])
]
)
AM_CONDITIONAL(LINUX, test "$linux" = true)
AM_CONDITIONAL(BSD, test "$bsd" = true)
AM_CONDITIONAL(SOLARIS, test "$solaris" = true)
AM_CONDITIONAL(MINGW, test "$mingw" = true)
AM_CONDITIONAL(CYGWIN, test "$cygwin" = true)
AM_CONDITIONAL(UML, test "$uml" = true)
AM_CONDITIONAL(VDE, test "$vde" = true)
AM_CONDITIONAL(TUNEMU, test "$tunemu" = true)
AC_CACHE_SAVE
if test -d /sw/include ; then
CPPFLAGS="$CPPFLAGS -I/sw/include"
fi
if test -d /sw/lib ; then
LIBS="$LIBS -L/sw/lib"
fi
dnl Compiler hardening flags
dnl No -fstack-protector-all because it doesn't work on all platforms or architectures.
AC_ARG_ENABLE([hardening], AS_HELP_STRING([--disable-hardening], [disable compiler and linker hardening flags]))
AS_IF([test "x$enable_hardening" != "xno"],
[AX_CHECK_COMPILE_FLAG([-DFORTIFY_SOURCE=2], [CPPFLAGS="$CPPFLAGS -DFORITFY_SOURCE=2"])
AX_CHECK_COMPILE_FLAG([-fno-strict-overflow], [CPPFLAGS="$CPPFLAGS -fno-strict-overflow"])
AX_CHECK_COMPILE_FLAG([-fwrapv], [CPPFLAGS="$CPPFLAGS -fwrapv"])
case $host_os in
*mingw*)
AX_CHECK_LINK_FLAG([-Wl,--dynamicbase], [LDFLAGS="$LDFLAGS -Wl,--dynamicbase"])
AX_CHECK_LINK_FLAG([-Wl,--nxcompat], [LDFLAGS="$LDFLAGS -Wl,--nxcompat"])
;;
*)
AX_CHECK_COMPILE_FLAG([-fPIE], [CPPFLAGS="$CPPFLAGS -fPIE"])
AX_CHECK_LINK_FLAG([-pie], [LDFLAGS="$LDFLAGS -pie"])
;;
esac
AX_CHECK_LINK_FLAG([-Wl,-z,relro], [LDFLAGS="$LDFLAGS -Wl,-z,relro"])
AX_CHECK_LINK_FLAG([-Wl,-z,now], [LDFLAGS="$LDFLAGS -Wl,-z,now"])
]
);
dnl Checks for header files.
dnl We do this in multiple stages, because unlike Linux all the other operating systems really suck and don't include their own dependencies.
AC_HEADER_STDC
AC_CHECK_HEADERS([stdbool.h syslog.h sys/file.h sys/ioctl.h sys/mman.h sys/param.h sys/resource.h sys/socket.h sys/time.h sys/uio.h sys/un.h sys/wait.h netdb.h arpa/inet.h dirent.h])
AC_CHECK_HEADERS([net/if.h net/if_types.h linux/if_tun.h net/if_tun.h net/tun/if_tun.h net/if_tap.h net/tap/if_tap.h net/ethernet.h net/if_arp.h netinet/in_systm.h netinet/in.h netinet/in6.h time.h netpacket/packet.h],
[], [], [#include "src/have.h"]
)
AC_CHECK_HEADERS([netinet/if_ether.h netinet/ip.h netinet/ip6.h resolv.h],
[], [], [#include "src/have.h"]
)
AC_CHECK_HEADERS([netinet/tcp.h netinet/ip_icmp.h netinet/icmp6.h],
[], [], [#include "src/have.h"]
)
dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_VOLATILE
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_HEADER_TIME
AC_STRUCT_TM
tinc_ATTRIBUTE(__malloc__)
tinc_ATTRIBUTE(__warn_unused_result__)
AC_CHECK_TYPES([socklen_t, struct ether_header, struct arphdr, struct ether_arp, struct in_addr, struct addrinfo, struct ip, struct icmp, struct in6_addr, struct sockaddr_in6, struct ip6_hdr, struct icmp6_hdr, struct nd_neighbor_solicit, struct nd_opt_hdr], , ,
[#include "src/have.h"]
)
dnl Checks for library functions.
AC_TYPE_SIGNAL
AC_CHECK_FUNCS([asprintf daemon fchmod flock ftime fork get_current_dir_name gettimeofday mlockall putenv random select strdup strerror strsignal strtol system time usleep unsetenv vsyslog writev],
[], [], [#include "src/have.h"]
)
dnl Support for SunOS
AC_CHECK_FUNC(socket, [], [
AC_CHECK_LIB(socket, connect)
])
AC_CHECK_FUNC(gethostbyname, [], [
AC_CHECK_LIB(nsl, gethostbyname)
])
AC_CHECK_DECLS([freeaddrinfo, gai_strerror, getaddrinfo, getnameinfo],
[], [], [#include "src/have.h"]
)
AC_CHECK_DECLS([res_init], [LIBS="$LIBS -lresolv"], [], [
#include <netinet/in.h>
#include <resolv.h>
])
AC_CACHE_SAVE
dnl These are defined in files in m4/
dnl AC_ARG_WITH(libgcrypt, AC_HELP_STRING([--with-libgcrypt], [enable use of libgcrypt instead of OpenSSL])], [])
tinc_CURSES
tinc_READLINE
tinc_ZLIB
tinc_LZO
if test -n "$with_libgcrypt"; then
gcrypt=true
tinc_LIBGCRYPT
else
openssl=true
tinc_OPENSSL
fi
AM_CONDITIONAL(OPENSSL, test -n "$openssl")
AM_CONDITIONAL(GCRYPT, test -n "$gcrypt")
dnl Check if support for jumbograms is requested
AC_ARG_ENABLE(jumbograms,
AS_HELP_STRING([--enable-jumbograms], [enable support for jumbograms (packets up to 9000 bytes)]),
[ AS_IF([test "x$enable_jumbograms" = "xyes"],
[ AC_DEFINE(ENABLE_JUMBOGRAMS, 1, [Support for jumbograms (packets up to 9000 bytes)]) ])
]
)
AC_CONFIG_FILES([Makefile src/Makefile doc/Makefile m4/Makefile gui/Makefile test/Makefile])
AC_OUTPUT
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