ConfigureChecks.cmake

   1 include(CheckIncludeFile)
   2 include(CheckSymbolExists)
   3 include(CheckFunctionExists)
   4 include(CheckLibraryExists)
   5 include(CheckTypeSize)
   6 include(CheckStructHasMember)
   7 include(CheckPrototypeDefinition)
   8 include(TestBigEndian)
   9
  10 set(BINARYDIR ${resolv_wrapper_BINARY_DIR})
  11 set(SOURCEDIR ${resolv_wrapper_SOURCE_DIR})
  12
  13 function(COMPILER_DUMPVERSION _OUTPUT_VERSION)
  14     # Remove whitespaces from the argument.
  15     # This is needed for CC="ccache gcc" cmake ..
  16     string(REPLACE " " "" _C_COMPILER_ARG "${CMAKE_C_COMPILER_ARG1}")
  17
  18     execute_process(
  19         COMMAND
  20             ${CMAKE_C_COMPILER} ${_C_COMPILER_ARG} -dumpversion
  21         OUTPUT_VARIABLE _COMPILER_VERSION
  22     )
  23
  24     string(REGEX REPLACE "([0-9])\\.([0-9])(\\.[0-9])?" "\\1\\2"
  25            _COMPILER_VERSION "${_COMPILER_VERSION}")
  26
  27     set(${_OUTPUT_VERSION} ${_COMPILER_VERSION} PARENT_SCOPE)
  28 endfunction()
  29
  30 if(CMAKE_COMPILER_IS_GNUCC AND NOT MINGW AND NOT OS2)
  31     compiler_dumpversion(GNUCC_VERSION)
  32     if (NOT GNUCC_VERSION EQUAL 34)
  33         set(CMAKE_REQUIRED_FLAGS "-fvisibility=hidden")
  34         check_c_source_compiles(
  35 "void __attribute__((visibility(\"default\"))) test() {}
  36 int main(void){ return 0; }
  37 " WITH_VISIBILITY_HIDDEN)
  38         unset(CMAKE_REQUIRED_FLAGS)
  39     endif (NOT GNUCC_VERSION EQUAL 34)
  40 endif(CMAKE_COMPILER_IS_GNUCC AND NOT MINGW AND NOT OS2)
  41
  42 # HEADERS
  43 check_include_file(sys/types.h HAVE_SYS_TYPES_H)
  44 check_include_file(resolv.h HAVE_RESOLV_H)
  45 check_include_file(arpa/nameser.h HAVE_ARPA_NAMESER_H)
  46
  47 # SYMBOLS
  48 set(CMAKE_REQUIRED_FLAGS -D_GNU_SOURCE)
  49 check_symbol_exists(program_invocation_short_name
  50                     "errno.h"
  51                     HAVE_PROGRAM_INVOCATION_SHORT_NAME)
  52 unset(CMAKE_REQUIRED_FLAGS)
  53
  54 # FUNCTIONS
  55 check_function_exists(getprogname HAVE_GETPROGNAME)
  56 check_function_exists(getexecname HAVE_GETEXECNAME)
  57
  58 find_library(RESOLV_LIRBRARY resolv)
  59 if (RESOLV_LIRBRARY)
  60     check_function_exists(res_nquery HAVE_LIBC_RES_INIT)
  61     check_function_exists(__res_query HAVE_LIBC__RES_INIT)
  62
  63     if (NOT HAVE_LIBC_RES_INIT AND NOT HAVE_LIBC__RES_INIT)
  64         set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  65         check_function_exists(res_query HAVE_RES_QUERY)
  66         check_function_exists(__res_query HAVE___RES_QUERY)
  67         unset(CMAKE_REQUIRED_LIBRARIES)
  68
  69         if (HAVE_RES_QUERY OR HAVE___RES_QUERY)
  70             set(HAVE_LIBRESOLV 1)
  71
  72         endif()
  73     endif()
  74
  75     # If we have a libresolv, we need to check functions linking the library
  76     list(APPEND _REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  77 endif()
  78
  79 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  80 check_function_exists(res_init HAVE_RES_INIT)
  81 check_function_exists(__res_init HAVE___RES_INIT)
  82 unset(CMAKE_REQUIRED_LIBRARIES)
  83
  84 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  85 check_function_exists(res_ninit HAVE_RES_NINIT)
  86 check_function_exists(__res_ninit HAVE___RES_NINIT)
  87 unset(CMAKE_REQUIRED_LIBRARIES)
  88
  89 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  90 check_function_exists(res_close HAVE_RES_CLOSE)
  91 check_function_exists(__res_close HAVE___RES_CLOSE)
  92 unset(CMAKE_REQUIRED_LIBRARIES)
  93
  94 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  95 check_function_exists(res_nclose HAVE_RES_NCLOSE)
  96 check_function_exists(__res_nclose HAVE___RES_NCLOSE)
  97 unset(CMAKE_REQUIRED_LIBRARIES)
  98
  99 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
 100 check_function_exists(res_query HAVE_RES_QUERY)
 101 check_function_exists(__res_query HAVE___RES_QUERY)
 102 unset(CMAKE_REQUIRED_LIBRARIES)
 103
 104 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
 105 check_function_exists(res_nquery HAVE_RES_NQUERY)
 106 check_function_exists(__res_nquery HAVE___RES_NQUERY)
 107 unset(CMAKE_REQUIRED_LIBRARIES)
 108
 109 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
 110 check_function_exists(res_search HAVE_RES_SEARCH)
 111 check_function_exists(__res_search HAVE___RES_SEARCH)
 112 unset(CMAKE_REQUIRED_LIBRARIES)
 113
 114 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
 115 check_function_exists(res_nsearch HAVE_RES_NSEARCH)
 116 check_function_exists(__res_nsearch HAVE___RES_NSEARCH)
 117 unset(CMAKE_REQUIRED_LIBRARIES)
 118
 119 check_symbol_exists(ns_name_compress "sys/types.h;arpa/nameser.h" HAVE_NS_NAME_COMPRESS)
 120
 121 if (UNIX)
 122     if (NOT LINUX)
 123         # libsocket (Solaris)
 124         find_library(SOCKET_LIBRARY socket)
 125         if (SOCKET_LIBRARY)
 126             check_library_exists(${SOCKET_LIBRARY} getaddrinfo "" HAVE_LIBSOCKET)
 127             if (HAVE_LIBSOCKET)
 128                 list(APPEND _REQUIRED_LIBRARIES ${SOCKET_LIBRARY})
 129             endif()
 130         endif()
 131
 132         # libnsl/inet_pton (Solaris)
 133         find_library(NSL_LIBRARY nsl)
 134         if (NSL_LIBRARY)
 135             check_library_exists(${NSL_LIBRARY} inet_pton "" HAVE_LIBNSL)
 136             if (HAVE_LIBNSL)
 137                 list(APPEND _REQUIRED_LIBRARIES ${NSL_LIBRARY})
 138             endif()
 139         endif()
 140     endif (NOT LINUX)
 141
 142     check_function_exists(getaddrinfo HAVE_GETADDRINFO)
 143 endif (UNIX)
 144
 145 find_library(DLFCN_LIBRARY dl)
 146 if (DLFCN_LIBRARY)
 147     list(APPEND _REQUIRED_LIBRARIES ${DLFCN_LIBRARY})
 148 else()
 149     check_function_exists(dlopen HAVE_DLOPEN)
 150     if (NOT HAVE_DLOPEN)
 151         message(FATAL_ERROR "FATAL: No dlopen() function detected")
 152     endif()
 153 endif()
 154
 155 # IPV6
 156 check_c_source_compiles("
 157     #include <stdlib.h>
 158     #include <sys/socket.h>
 159     #include <netdb.h>
 160     #include <netinet/in.h>
 161     #include <net/if.h>
 162
 163 int main(void) {
 164     struct sockaddr_storage sa_store;
 165     struct addrinfo *ai = NULL;
 166     struct in6_addr in6addr;
 167     int idx = if_nametoindex(\"iface1\");
 168     int s = socket(AF_INET6, SOCK_STREAM, 0);
 169     int ret = getaddrinfo(NULL, NULL, NULL, &ai);
 170     if (ret != 0) {
 171         const char *es = gai_strerror(ret);
 172     }
 173
 174     freeaddrinfo(ai);
 175     {
 176         int val = 1;
 177 #ifdef HAVE_LINUX_IPV6_V6ONLY_26
 178 #define IPV6_V6ONLY 26
 179 #endif
 180         ret = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
 181                          (const void *)&val, sizeof(val));
 182     }
 183
 184     return 0;
 185 }" HAVE_IPV6)
 186
 187 check_struct_has_member("struct __res_state" _u._ext.nsaddrs
 188                         "sys/socket.h;netinet/in.h;resolv.h"
 189                         HAVE_RES_STATE_U_EXT_NSADDRS)
 190 check_struct_has_member("union res_sockaddr_union" sin
 191                         "sys/socket.h;netinet/in.h;resolv.h"
 192                         HAVE_RES_SOCKADDR_UNION_SIN)
 193 check_struct_has_member("union res_sockaddr_union" sin6
 194                         "sys/socket.h;netinet/in.h;resolv.h"
 195                         HAVE_RES_SOCKADDR_UNION_SIN6)
 196
 197 check_c_source_compiles("
 198 void log_fn(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
 199
 200 int main(void) {
 201     return 0;
 202 }" HAVE_ATTRIBUTE_PRINTF_FORMAT)
 203
 204 check_c_source_compiles("
 205 void test_destructor_attribute(void) __attribute__ ((destructor));
 206
 207 void test_destructor_attribute(void)
 208 {
 209     return;
 210 }
 211
 212 int main(void) {
 213     return 0;
 214 }" HAVE_DESTRUCTOR_ATTRIBUTE)
 215
 216 # ENDIAN
 217 test_big_endian(WORDS_BIGENDIAN)
 218
 219 if (NOT HAVE_LIBRESOLV)
 220     message(STATUS "Limited features: Only dns faking will be available")
 221 endif()
 222
 223 set(RWRAP_REQUIRED_LIBRARIES ${_REQUIRED_LIBRARIES} CACHE INTERNAL "resolv_wrapper required system libraries")