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dnl Use krb5-config to get link paths for Kerberos libraries.
dnl
dnl Provides one macro, RRA_KRB5_CONFIG, which attempts to get compiler and
dnl linker flags for a library via krb5-config and sets the appropriate shell
dnl variables. Defines the Autoconf variable PATH_KRB5_CONFIG, which can be
dnl used to find the default path to krb5-config.
dnl
dnl Depends on RRA_ENABLE_REDUCED_DEPENDS.
dnl
dnl The canonical version of this file is maintained in the rra-c-util
dnl package, available at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
dnl
dnl Written by Russ Allbery <rra@stanford.edu>
dnl Copyright 2011, 2012
dnl The Board of Trustees of the Leland Stanford Junior University
dnl
dnl This file is free software; the authors give unlimited permission to copy
dnl and/or distribute it, with or without modifications, as long as this
dnl notice is preserved.
dnl Check for krb5-config in the user's path and set PATH_KRB5_CONFIG. This
dnl is moved into a separate macro so that it can be loaded via AC_REQUIRE,
dnl meaning it will only be run once even if we link with multiple krb5-config
dnl libraries.
AC_DEFUN([_RRA_KRB5_CONFIG_PATH],
[AC_ARG_VAR([PATH_KRB5_CONFIG], [Path to krb5-config])
AC_PATH_PROG([PATH_KRB5_CONFIG], [krb5-config], [],
[${PATH}:/usr/kerberos/bin])])
dnl Check whether the --deps flag is supported by krb5-config. Takes the path
dnl to krb5-config to use. Note that this path is not embedded in the cache
dnl variable, so this macro implicitly assumes that we will always use the
dnl same krb5-config program.
AC_DEFUN([_RRA_KRB5_CONFIG_DEPS],
[AC_REQUIRE([_RRA_KRB5_CONFIG_PATH])
AC_CACHE_CHECK([for --deps support in krb5-config],
[rra_cv_krb5_config_deps],
[AS_IF(["$1" 2>&1 | grep deps >/dev/null 2>&1],
[rra_cv_krb5_config_deps=yes],
[rra_cv_krb5_config_deps=no])])])
dnl Obtain the library flags for a particular library using krb5-config.
dnl Takes the path to the krb5-config program to use, the argument to
dnl krb5-config to use, and the variable prefix under which to store the
dnl library flags.
AC_DEFUN([_RRA_KRB5_CONFIG_LIBS],
[AC_REQUIRE([_RRA_KRB5_CONFIG_PATH])
AC_REQUIRE([RRA_ENABLE_REDUCED_DEPENDS])
_RRA_KRB5_CONFIG_DEPS([$1])
AS_IF([test x"$rra_reduced_depends" = xfalse \
&& test x"$rra_cv_krb5_config_deps" = xyes],
[$3[]_LIBS=`"$1" --deps --libs $2 2>/dev/null`],
[$3[]_LIBS=`"$1" --libs $2 2>/dev/null`])])
dnl Attempt to find the flags for a library using krb5-config. Takes the
dnl following arguments (in order):
dnl
dnl 1. The root directory for the library in question, generally from an
dnl Autoconf --with flag. Used by preference as the path to krb5-config.
dnl
dnl 2. The argument to krb5-config to retrieve flags for this particular
dnl library.
dnl
dnl 3. The variable prefix to use when setting CPPFLAGS and LIBS variables
dnl based on the result of krb5-config.
dnl
dnl 4. Further actions to take if krb5-config was found and supported that
dnl library type.
dnl
dnl 5. Further actions to take if krb5-config could not be used to get flags
dnl for that library type.
dnl
dnl Special-case a krb5-config argument of krb5 and run krb5-config without an
dnl argument if that option was requested and not supported. Old versions of
dnl krb5-config didn't take an argument to specify the library type, but
dnl always returned the flags for libkrb5.
AC_DEFUN([RRA_KRB5_CONFIG],
[AC_REQUIRE([_RRA_KRB5_CONFIG_PATH])
rra_krb5_config_$3=
rra_krb5_config_$3[]_ok=
AS_IF([test x"$1" != x && test -x "$1/bin/krb5-config"],
[rra_krb5_config_$3="$1/bin/krb5-config"],
[rra_krb5_config_$3="$PATH_KRB5_CONFIG"])
AS_IF([test x"$rra_krb5_config_$3" != x && test -x "$rra_krb5_config_$3"],
[AC_CACHE_CHECK([for $2 support in krb5-config], [rra_cv_lib_$3[]_config],
[AS_IF(["$rra_krb5_config_$3" 2>&1 | grep $2 >/dev/null 2>&1],
[rra_cv_lib_$3[]_config=yes],
[rra_cv_lib_$3[]_config=no])])
AS_IF([test "$rra_cv_lib_$3[]_config" = yes],
[$3[]_CPPFLAGS=`"$rra_krb5_config_$3" --cflags $2 2>/dev/null`
_RRA_KRB5_CONFIG_LIBS([$rra_krb5_config_$3], [$2], [$3])
rra_krb5_config_$3[]_ok=yes],
[AS_IF([test x"$2" = xkrb5],
[$3[]_CPPFLAGS=`"$rra_krb5_config_$3" --cflags 2>/dev/null`
$3[]_LIBS=`"$rra_krb5_config_$3" --libs $2 2>/dev/null`
rra_krb5_config_$3[]_ok=yes])])])
AS_IF([test x"$rra_krb5_config_$3[]_ok" = xyes],
[$3[]_CPPFLAGS=`echo "$$3[]_CPPFLAGS" | sed 's%-I/usr/include %%'`
$3[]_CPPFLAGS=`echo "$$3[]_CPPFLAGS" | sed 's%-I/usr/include$%%'`
$4],
[$5])])
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