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     set(HAVE_LIBRESOLV TRUE)
  61
  62     # If we have a libresolv, we need to check functions linking the library
  63     list(APPEND _REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  64 else()
  65     message(STATUS "libresolv not found on ${CMAKE_SYSTEM_NAME}: Only dns faking will be available")
  66 endif()
  67
  68 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  69 check_function_exists(res_init HAVE_RES_INIT)
  70 check_function_exists(__res_init HAVE___RES_INIT)
  71 unset(CMAKE_REQUIRED_LIBRARIES)
  72
  73 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  74 check_function_exists(res_ninit HAVE_RES_NINIT)
  75 check_function_exists(__res_ninit HAVE___RES_NINIT)
  76 unset(CMAKE_REQUIRED_LIBRARIES)
  77
  78 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  79 check_function_exists(res_close HAVE_RES_CLOSE)
  80 check_function_exists(__res_close HAVE___RES_CLOSE)
  81 unset(CMAKE_REQUIRED_LIBRARIES)
  82
  83 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  84 check_function_exists(res_nclose HAVE_RES_NCLOSE)
  85 check_function_exists(__res_nclose HAVE___RES_NCLOSE)
  86 unset(CMAKE_REQUIRED_LIBRARIES)
  87
  88 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  89 check_function_exists(res_query HAVE_RES_QUERY)
  90 check_function_exists(__res_query HAVE___RES_QUERY)
  91 unset(CMAKE_REQUIRED_LIBRARIES)
  92
  93 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  94 check_function_exists(res_nquery HAVE_RES_NQUERY)
  95 check_function_exists(__res_nquery HAVE___RES_NQUERY)
  96 unset(CMAKE_REQUIRED_LIBRARIES)
  97
  98 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
  99 check_function_exists(res_search HAVE_RES_SEARCH)
 100 check_function_exists(__res_search HAVE___RES_SEARCH)
 101 unset(CMAKE_REQUIRED_LIBRARIES)
 102
 103 set(CMAKE_REQUIRED_LIBRARIES ${RESOLV_LIRBRARY})
 104 check_function_exists(res_nsearch HAVE_RES_NSEARCH)
 105 check_function_exists(__res_nsearch HAVE___RES_NSEARCH)
 106 unset(CMAKE_REQUIRED_LIBRARIES)
 107
 108 check_symbol_exists(ns_name_compress "sys/types.h;arpa/nameser.h" HAVE_NS_NAME_COMPRESS)
 109
 110 if (UNIX)
 111     if (NOT LINUX)
 112         # libsocket (Solaris)
 113         find_library(SOCKET_LIBRARY socket)
 114         if (SOCKET_LIBRARY)
 115             check_library_exists(${SOCKET_LIBRARY} getaddrinfo "" HAVE_LIBSOCKET)
 116             if (HAVE_LIBSOCKET)
 117                 list(APPEND _REQUIRED_LIBRARIES ${SOCKET_LIBRARY})
 118             endif()
 119         endif()
 120
 121         # libnsl/inet_pton (Solaris)
 122         find_library(NSL_LIBRARY nsl)
 123         if (NSL_LIBRARY)
 124             check_library_exists(${NSL_LIBRARY} inet_pton "" HAVE_LIBNSL)
 125             if (HAVE_LIBNSL)
 126                 list(APPEND _REQUIRED_LIBRARIES ${NSL_LIBRARY})
 127             endif()
 128         endif()
 129     endif (NOT LINUX)
 130
 131     check_function_exists(getaddrinfo HAVE_GETADDRINFO)
 132 endif (UNIX)
 133
 134 find_library(DLFCN_LIBRARY dl)
 135 if (DLFCN_LIBRARY)
 136     list(APPEND _REQUIRED_LIBRARIES ${DLFCN_LIBRARY})
 137 else()
 138     check_function_exists(dlopen HAVE_DLOPEN)
 139     if (NOT HAVE_DLOPEN)
 140         message(FATAL_ERROR "FATAL: No dlopen() function detected")
 141     endif()
 142 endif()
 143
 144 # IPV6
 145 check_c_source_compiles("
 146     #include <stdlib.h>
 147     #include <sys/socket.h>
 148     #include <netdb.h>
 149     #include <netinet/in.h>
 150     #include <net/if.h>
 151
 152 int main(void) {
 153     struct sockaddr_storage sa_store;
 154     struct addrinfo *ai = NULL;
 155     struct in6_addr in6addr;
 156     int idx = if_nametoindex(\"iface1\");
 157     int s = socket(AF_INET6, SOCK_STREAM, 0);
 158     int ret = getaddrinfo(NULL, NULL, NULL, &ai);
 159     if (ret != 0) {
 160         const char *es = gai_strerror(ret);
 161     }
 162
 163     freeaddrinfo(ai);
 164     {
 165         int val = 1;
 166 #ifdef HAVE_LINUX_IPV6_V6ONLY_26
 167 #define IPV6_V6ONLY 26
 168 #endif
 169         ret = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
 170                          (const void *)&val, sizeof(val));
 171     }
 172
 173     return 0;
 174 }" HAVE_IPV6)
 175
 176 check_struct_has_member("struct __res_state" _u._ext.nsaddrs resolv.h HAVE_RESOLV_IPV6_NSADDRS)
 177
 178 check_c_source_compiles("
 179 void log_fn(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
 180
 181 int main(void) {
 182     return 0;
 183 }" HAVE_ATTRIBUTE_PRINTF_FORMAT)
 184
 185 check_c_source_compiles("
 186 void test_destructor_attribute(void) __attribute__ ((destructor));
 187
 188 void test_destructor_attribute(void)
 189 {
 190     return;
 191 }
 192
 193 int main(void) {
 194     return 0;
 195 }" HAVE_DESTRUCTOR_ATTRIBUTE)
 196
 197 # ENDIAN
 198 test_big_endian(WORDS_BIGENDIAN)
 199
 200 set(RWRAP_REQUIRED_LIBRARIES ${_REQUIRED_LIBRARIES} CACHE INTERNAL "resolv_wrapper required system libraries")