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<div name="messageBodySection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;">Dear all,
<div>I found two problems in Nek500 while i try to make some changes to the source codes.</div>
<div>1. When using GDB, I cannot break on some specific lines, it prompts message like missing line number information.</div>
<div>I’ve enabled the debuging Flag “G=-g” in bin/makenek</div>
<div>2. I want to use optimization level O0 instead of the default O2 to make gdb debugging easier. So i changed line number 122 in core/makefile.template from "L2=$(G) -O2” to "L2=$(G) -O0”. </div>
<div>While compiling with -O2 the result is correct , there is segment fault with -O0.</div>
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<div>Developing Environment:</div>
<div>CENTOS 6.5 </div>
<div>GCC-4.9.2 </div>
<div>Nek example: eddy_uv</div>
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<div>Thanks</div>
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<div name="messageSignatureSection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;"><br />
Steven</div>
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