I'm sorry if I sound ignorant but I've been looking at this problem for a few days and I'm lost. I have googled but failed to find a relevant answer.
I have been trying to compile mergelog <http://mergelog.sourceforge.net/> (or more importantly zmergelog which is built from the same source file) under Cygwin.
Zmergelog is a fairly simple program to merge gziped Apache log files. It uses zlib to open and read the gziped files.
Mergelog's configure script appears to find that I have zlib installed but when I get to make zmergelog the link fails with undefined references to _gzopen _gzread and _gzclose.
I would be really grateful if someone could give me a hint how to compile zmergelog under Cygwin.
The output of the configure / make session and also cygcheck are attached.
Many thanks in advance.
Mark,
This is definitely a bug in zmergelog's Makefile:
gcc -DHAVE_LIBZ=1 -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -DHAVE_MKTIME=1 -I.
-I. -g -O2 -lz -DVERSION=\"4.5\" -Wall -DUSE_ZLIB mergelog.c -o zmergelog
^^^
The -lz should go to the *end* of the compile line (at least, after the .c
file). In other words, the correct gcc invocation isgcc -DHAVE_LIBZ=1 -DSTDC_HEADERS=1 -DHAVE_UNISTD_H=1 -DHAVE_MKTIME=1 -I. -I. -g -O2 -DVERSION=\"4.5\" -Wall -DUSE_ZLIB mergelog.c -lz -o zmergelog
I haven't seen the Makefile, but I have a feeling that this is because the "zmergelog" target depends on a ".c" file instead of a ".o". If you changed the dependence to "mergelog.o", you might get the correct link sequence.
Hope this helps,
Igor
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