Back Midas Rome Roody Rootana
  Midas DAQ System  Not logged in ELOG logo
 Back  |  Find  |  Login  |  Help 
Entry  18 Apr 2012, Exaos Lee, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’ mlogger-err.log.gz
    Reply  19 Apr 2012, Stefan Ritt, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’ 
       Reply  25 Apr 2012, Konstantin Olchanski, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’ 
          Reply  27 Apr 2012, Stefan Ritt, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’ 
Message ID: 787     Entry time: 19 Apr 2012     In reply to: 786     Reply to this: 788
Author: Stefan Ritt 
Topic: Bug Report 
Subject: Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’ 

Exaos Lee wrote:
I tried to build MIDAS under ArchLinux, failed on errors as following:
src/mlogger.cxx: In function ‘INT midas_flush_buffer(LOG_CHN*)’:
src/mlogger.cxx:1011:54: error: invalid conversion from ‘void*’ to ‘gzFile’ [-fpermissive]
In file included from src/mlogger.cxx:33:0:
/usr/include/zlib.h:1318:21: error:   initializing argument 1 of ‘int gzwrite(gzFile, voidpc, unsigned int)’ [-fpermissive]
src/mlogger.cxx: In function ‘INT midas_log_open(LOG_CHN*, INT)’:
src/mlogger.cxx:1200:79: error: invalid conversion from ‘void*’ to ‘gzFile’ [-fpermissive]
In file included from src/mlogger.cxx:33:0:
Please refer to attachment elog:786/1 for detail. There are also many warnings listed.

This error can be supressed by adding -fpermissive to CXXFLAGS. But the error message is correct."gzFile" is not equal to "void *"! C allows implicit casts between void* and any pointer type, C++ doesn't allow that. It's better to fix this error. A quick fix would be adding explicit casts. But I'm not sure what is the proper way to fix this.


Ah, dumb gcc gets pickier and pickier. I added a case (gzFile)log_chn->gzfile which fixes the error. I cannot put gzFile already into the header file since the zlib header is included after the midas header, otherwise we get some other problems. The SVN version with the fix is 5275.
ELOG V3.1.4-2e1708b5