<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7654.12">
<TITLE>Concurrent build bug?</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/rtf format -->
<P><FONT SIZE=2 FACE="Verdana">Hi,</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">I have had a search for this issue on the Trac and the mail list archives but couldn't find anything.</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">I am trying to build libgeotiff 1.2.5 using multiple concurrent build processes, but I think there is a subtle bug in the Makefile.in that misses a dependency. This results in the build failing sometimes, depending on how the scheduling works out.</FONT></P>
<P><FONT SIZE=2 FACE="Verdana">I think that some of the files like geo_free.c/o rely on xtiffio.h</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">Xtiffio.h is a symlink and is removed and recreated by the ${XTIFFINC} rule.</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">Geo_free.o is created by it's own rule and is also contained in the ${OBJS} (via ${CORE_OBJS}) rules. However, none of these seem to contain the dependency on ${XTIFFINC}. The result seems to be that sometimes the XTIFFINC rule is interleaved with the building of the core objects, so you get something like:</FONT></P>
<P><FONT SIZE=2 FACE="Verdana">rm xtiffio.h</FONT>
<BR><FONT SIZE=2 FACE="Verdana">gcc -c ….. Geo_free.c</FONT>
<BR><FONT SIZE=2 FACE="Verdana">ln -s ./libxtiff/*.h (which includes xtiffio.h)</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">So then the compilation fails because it can't find the xtiffio.h and the build bombs out. Running the build again with no changes will then work.</FONT></P>
<P><FONT SIZE=2 FACE="Verdana">As a workaround, I can avoid the use of the -j flag (or use -j 1).</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">Is anyone familiar with the build files that can confirm or deny this is a bug?</FONT>
</P>
<P><FONT SIZE=2 FACE="Verdana">Thanks for your help,</FONT>
</P>
<P><B><FONT COLOR="#00344D" SIZE=2 FACE="Verdana">Tom Dalton</FONT></B>
</P>
</BODY>
</HTML>