hi <div><br></div><div>when i debug varnish source code with gdb, i found <span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)"> some </span><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)">variables </span><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)">showing "</span><strong style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:14px;vertical-align:baseline;background-image:initial;background-color:rgb(255,255,255);font-weight:bold;font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;line-height:18px;text-align:left">value optimized out"</strong></div>
<div><strong style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:14px;vertical-align:baseline;background-image:initial;background-color:rgb(255,255,255);font-weight:bold;font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;line-height:18px;text-align:left"><br>
</strong></div><div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px">i think it should compiler optimization,and i found CFlags = " -g -O2 " in Makefile.</span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px"><br></span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px">so i recompiled the source code:</span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px"><br></span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px">export CFLAGS=" -g  -O0 " && ./configure && make && make install</span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px"><br></span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px">i check the CFlags in Makefile and found it was </span></font><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px"> </span><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;text-align:-webkit-auto">CFlags = " -g -O0 ", it seems the compilation should be success</span></div>
<div style="text-align:left"><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;text-align:-webkit-auto"><br></span></div><div style="text-align:left">
<span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;text-align:-webkit-auto">then i debug the source code again and found </span><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)">those </span><span class="Apple-style-span" style="text-align:-webkit-auto;font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)">variables still showing </span><span class="Apple-style-span" style="font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;font-size:14px;line-height:18px;background-color:rgb(255,255,255)">"</span><strong style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:14px;vertical-align:baseline;background-image:initial;background-color:rgb(255,255,255);font-weight:bold;font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;line-height:18px">value optimized out"</strong></div>
<div style="text-align:left"><strong style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:14px;vertical-align:baseline;background-image:initial;background-color:rgb(255,255,255);font-weight:bold;font-family:Arial,'Liberation Sans','DejaVu Sans',sans-serif;line-height:18px"><br>
</strong></div><div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px">it seems strange, how to solve it?  thanks for you answer!</span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px"><br></span></font></div>
<div style="text-align:left"><font class="Apple-style-span" face="Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif"><span class="Apple-style-span" style="font-size:14px;line-height:18px"><br></span></font></div>