IJ36395: XLCLANG CONFLICTS WITH /USR/INCLUDE/SYS/SOCKET.H

APAR status

• Closed as program error.

Error description

• When compiling the following test case, the compiler issues the
  error messages mentioned below:
  
  ===== COMPILE COMMAND:
  xlclang++ socket_fun.cpp
  
  ===== TESTCASE:
  $ cat socket_fun.cpp
  #include <sys/socket.h> int main(int argc, char** argv) { return
  0; }
  $
  
  
  ===== ACTUAL OUTPUT:
  /opt/IBM/xlC/16.1.0/include2/aix/sys/socket.h:41:5: error:
  declaration of 'accept' has a different language linkage
  int accept(int __socketfd, struct sockaddr *__address, socklen_t
  *__address_len) __asm__("naccept");
      ^
  /usr/include/sys/socket.h:125:18: note: previous definition is
  here
  _FAST_INLINE int accept(int socketfd, struct sockaddr *address,
  socklen_t *address_len)
                   ^
  In file included from socket_fun.cpp:1:
  /opt/IBM/xlC/16.1.0/include2/aix/sys/socket.h:42:5: error:
  declaration of 'getpeername' has a different language linkage
  int getpeername(int __socketfd, struct sockaddr *__address,
  socklen_t *__address_len) __asm__("ngetpeername");
      ^
  /usr/include/sys/socket.h:129:18: note: previous definition is
  here
  _FAST_INLINE int getpeername(int socketfd, struct sockaddr
  *address,
                   ^
  In file included from socket_fun.cpp:1:
  /opt/IBM/xlC/16.1.0/include2/aix/sys/socket.h:43:5: error:
  declaration of 'getsockname' has a different language linkage
  int getsockname(int __socketfd, struct sockaddr *__address,
  socklen_t *__address_len) __asm__("ngetsockname");
      ^
  /usr/include/sys/socket.h:134:18: note: previous definition is
  here
  _FAST_INLINE int getsockname(int socketfd, struct sockaddr
  *address,
                   ^
  In file included from socket_fun.cpp:1:
  /opt/IBM/xlC/16.1.0/include2/aix/sys/socket.h:44:9: error:
  declaration of 'recvfrom' has a different language linkage
  ssize_t recvfrom(int __socketfd, void *__buffer, size_t
  __length, int __flags,
          ^
  /usr/include/sys/socket.h:139:22: note: previous definition is
  here
  _FAST_INLINE ssize_t recvfrom(int socketfd, void *buffer, size_t
  length, int flags,
                       ^
  In file included from socket_fun.cpp:1:
  /opt/IBM/xlC/16.1.0/include2/aix/sys/socket.h:49:9: error:
  declaration of 'recvmsg' has a different language linkage
  ssize_t recvmsg(int __socketfd, struct msghdr *__message, int
  __flags) __asm__("nrecvmsg");
          ^
  /usr/include/sys/socket.h:149:22: note: previous definition is
  here
  _FAST_INLINE ssize_t recvmsg(int socketfd, struct msghdr
  *message, int flags)
                       ^
  In file included from socket_fun.cpp:1:
  /opt/IBM/xlC/16.1.0/include2/aix/sys/socket.h:50:9: error:
  declaration of 'sendmsg' has a different language linkage
  ssize_t sendmsg(int __socketfd, const struct msghdr *__message,
  int __flags) __asm__("nsendmsg");
          ^
  /usr/include/sys/socket.h:153:22: note: previous definition is
  here
  _FAST_INLINE ssize_t sendmsg(int socketfd, const struct msghdr
  *message, int flags)
                       ^
  6 errors generated.
  Error while processing socket_fun.cpp.
  
  ===== EXPECTED OUTPUT:
  Clean compile
  

Local fix

• N/A
  

Problem summary

• USERS AFFECTED:
  Users who include socket.h prior to other system headers are
  affected by this issue.
  
  PROBLEM DESCRIPTION:
  There is a socket.h wrapper header that references _ALL_SOURCE,
  which is not defined on entry but becomes defined during the
  include_next to socket.h.
  This causes the socket.h wrapper header to preprocess
  incorrectly.
  

Problem conclusion

• The socket.h wrapper header is fixed.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels