<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Ah, well this is the problem, and it is tough. Users commonly use CFLAGS for three things:<div><br></div><div>1) Specify optimization levels. This should not be included in any wrappers</div><div>2) Change the instruction set architecture (e.g., -m32 or -m64). This must be included in the wrappers</div><div>3) Change the language accepted by the compiler (e.g.,, -std=gnu99). This must be included in the wrappers</div><div><br></div><div>These really should be separate flags, but that's not going to happen. This is why we originally introduced COPTFLAGS - so that those could be easily separated. It is still a good idea, but it never caught on as standard practice.</div><div><br></div><div>Bill</div><div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="font-size: 12px; ">William Gropp</div><div style="font-size: 12px; ">Director, Parallel Computing Institute</div><div style="font-size: 12px; ">Deputy Director for Research</div><div style="font-size: 12px; ">Institute for Advanced Computing Applications and Technologies</div></div></div></span><span class="Apple-style-span" style="font-size: 12px; ">Thomas M. Siebel Chair in Computer Science</span><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="font-size: 12px; ">University of Illinois Urbana-Champaign</div></div><div><br></div></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
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<br><div><div>On Jan 18, 2014, at 9:41 AM, Jed Brown wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>William Gropp <<a href="mailto:wgropp@illinois.edu">wgropp@illinois.edu</a>> writes:<br><br><blockquote type="cite">If the MPI wrapper adds -O, its buggy. <br></blockquote><br>MPICH puts CFLAGS into the wrappers. Since this is the standard way of<br>specifying optimization when building a package, many users have<br>wrappers configured this way. MPICH must be configured using<br>MPICHLIB_CFLAGS (formerly MPICH2LIB_CFLAGS) if they do not want the<br>optimization to go into the wrappers. This causes real confusion such<br>as in this thread.<br><br><a href="http://www.open-mpi.org/community/lists/users/2008/10/6924.php">http://www.open-mpi.org/community/lists/users/2008/10/6924.php</a><br></div></blockquote></div><br></div></body></html>