1dnl Use krb5-config to get link paths for Kerberos libraries. 2dnl 3dnl Provides one macro, RRA_KRB5_CONFIG, which attempts to get compiler and 4dnl linker flags for a library via krb5-config and sets the appropriate shell 5dnl variables. Defines the Autoconf variable PATH_KRB5_CONFIG, which can be 6dnl used to find the default path to krb5-config. 7dnl 8dnl Depends on RRA_ENABLE_REDUCED_DEPENDS. 9dnl 10dnl The canonical version of this file is maintained in the rra-c-util 11dnl package, available at <https://www.eyrie.org/~eagle/software/rra-c-util/>. 12dnl 13dnl Written by Russ Allbery <eagle@eyrie.org> 14dnl Copyright 2018, 2021 Russ Allbery <eagle@eyrie.org> 15dnl Copyright 2011-2012 16dnl The Board of Trustees of the Leland Stanford Junior University 17dnl 18dnl This file is free software; the authors give unlimited permission to copy 19dnl and/or distribute it, with or without modifications, as long as this 20dnl notice is preserved. 21dnl 22dnl SPDX-License-Identifier: FSFULLR 23 24dnl Check for krb5-config in the user's path and set PATH_KRB5_CONFIG. This 25dnl is moved into a separate macro so that it can be loaded via AC_REQUIRE, 26dnl meaning it will only be run once even if we link with multiple krb5-config 27dnl libraries. 28AC_DEFUN([_RRA_KRB5_CONFIG_PATH], 29[AC_ARG_VAR([PATH_KRB5_CONFIG], [Path to krb5-config]) 30 AC_PATH_PROG([PATH_KRB5_CONFIG], [krb5-config], [], 31 [${PATH}:/usr/kerberos/bin])]) 32 33dnl Check whether the --deps flag is supported by krb5-config. Takes the path 34dnl to krb5-config to use. Note that this path is not embedded in the cache 35dnl variable, so this macro implicitly assumes that we will always use the 36dnl same krb5-config program. 37AC_DEFUN([_RRA_KRB5_CONFIG_DEPS], 38[AC_REQUIRE([_RRA_KRB5_CONFIG_PATH]) 39 AC_CACHE_CHECK([for --deps support in krb5-config], 40 [rra_cv_krb5_config_deps], 41 [AS_IF(["$1" 2>&1 | grep deps >/dev/null 2>&1], 42 [rra_cv_krb5_config_deps=yes], 43 [rra_cv_krb5_config_deps=no])])]) 44 45dnl Obtain the library flags for a particular library using krb5-config. 46dnl Takes the path to the krb5-config program to use, the argument to 47dnl krb5-config to use, and the variable prefix under which to store the 48dnl library flags. 49AC_DEFUN([_RRA_KRB5_CONFIG_LIBS], 50[AC_REQUIRE([_RRA_KRB5_CONFIG_PATH]) 51 AC_REQUIRE([RRA_ENABLE_REDUCED_DEPENDS]) 52 _RRA_KRB5_CONFIG_DEPS([$1]) 53 AS_IF([test x"$rra_reduced_depends" = xfalse \ 54 && test x"$rra_cv_krb5_config_deps" = xyes], 55 [$3[]_LIBS=`"$1" --deps --libs $2 2>/dev/null`], 56 [$3[]_LIBS=`"$1" --libs $2 2>/dev/null`])]) 57 58dnl Attempt to find the flags for a library using krb5-config. Takes the 59dnl following arguments (in order): 60dnl 61dnl 1. The root directory for the library in question, generally from an 62dnl Autoconf --with flag. Used by preference as the path to krb5-config. 63dnl 64dnl 2. The argument to krb5-config to retrieve flags for this particular 65dnl library. 66dnl 67dnl 3. The variable prefix to use when setting CPPFLAGS and LIBS variables 68dnl based on the result of krb5-config. 69dnl 70dnl 4. Further actions to take if krb5-config was found and supported that 71dnl library type. 72dnl 73dnl 5. Further actions to take if krb5-config could not be used to get flags 74dnl for that library type. 75dnl 76dnl Special-case a krb5-config argument of krb5 and run krb5-config without an 77dnl argument if that option was requested and not supported. Old versions of 78dnl krb5-config didn't take an argument to specify the library type, but 79dnl always returned the flags for libkrb5. 80AC_DEFUN([RRA_KRB5_CONFIG], 81[rra_krb5_config_$3= 82 rra_krb5_config_$3[]_ok= 83 AS_IF([test x"$1" != x && test -x "$1/bin/krb5-config"], 84 [rra_krb5_config_$3="$1/bin/krb5-config"], 85 [_RRA_KRB5_CONFIG_PATH 86 rra_krb5_config_$3="$PATH_KRB5_CONFIG"]) 87 AS_IF([test x"$rra_krb5_config_$3" != x && test -x "$rra_krb5_config_$3"], 88 [AC_CACHE_CHECK([for $2 support in krb5-config], [rra_cv_lib_$3[]_config], 89 [AS_IF(["$rra_krb5_config_$3" 2>&1 | grep $2 >/dev/null 2>&1], 90 [rra_cv_lib_$3[]_config=yes], 91 [rra_cv_lib_$3[]_config=no])]) 92 AS_IF([test "$rra_cv_lib_$3[]_config" = yes], 93 [$3[]_CPPFLAGS=`"$rra_krb5_config_$3" --cflags $2 2>/dev/null` 94 _RRA_KRB5_CONFIG_LIBS([$rra_krb5_config_$3], [$2], [$3]) 95 rra_krb5_config_$3[]_ok=yes], 96 [AS_IF([test x"$2" = xkrb5], 97 [$3[]_CPPFLAGS=`"$rra_krb5_config_$3" --cflags 2>/dev/null` 98 $3[]_LIBS=`"$rra_krb5_config_$3" --libs $2 2>/dev/null` 99 rra_krb5_config_$3[]_ok=yes])])]) 100 AS_IF([test x"$rra_krb5_config_$3[]_ok" = xyes], 101 [$3[]_CPPFLAGS=`AS_ECHO(["$$3[]_CPPFLAGS"]) | sed 's%-I/usr/include %%'` 102 $3[]_CPPFLAGS=`AS_ECHO(["$$3[]_CPPFLAGS"]) | sed 's%-I/usr/include$%%'` 103 $4], 104 [$5])]) 105