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<p class="MsoNormal"><span style="color:black">Hello,<o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black">GCC 10 has changed its default from “-fcommon” to “-fno-common” (<a href="https://gcc.gnu.org/legacy-ml/gcc-patches/2019-10/msg01847.html"><span style="color:#0563C1">ref</span></a>), and this results in build failure following several
errors such as:<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New";color:black">/usr/bin/ld: runtime_config.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:46: multiple definition of `Syslog_ident'; slon.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:46: first defined here</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:9.0pt;font-family:"Courier New";color:black">/usr/bin/ld: local_listen.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:56: multiple definition of `command_on_logarchive'; slon.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:56: first defined here</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New";color:black">/usr/bin/ld: remote_listen.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:53: multiple definition of `log_timestamp_format'; slon.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:53: first defined here</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New";color:black">/usr/bin/ld: remote_worker.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:54: multiple definition of `sql_on_connection'; slon.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:54: first defined here</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New";color:black">/usr/bin/ld: sync_thread.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:55: multiple definition of `lag_interval'; slon.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:55: first defined here</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New";color:black">/usr/bin/ld: monitor_thread.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:52: multiple definition of `drop_indices'; slon.o:/tmp/slony1-2.2.8/src/slon/confoptions.h:52: first defined here</span><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">The above is just a sample of the error messages…several dozen of these actually occur, and then the build fails with:<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Courier New";color:black">collect2: error: ld returned 1 exit status</span><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">This change in default value is referenced as the first item on the “Porting to GCC 10” page, along with a description of how best to address this change:<o:p></o:p></span></p>
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<span style="color:black"><a href="https://gcc.gnu.org/gcc-10/porting_to.html"><span style="color:#0563C1">https://gcc.gnu.org/gcc-10/porting_to.html</span></a><o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black">The workaround is to set<span class="apple-converted-space"> </span></span><span style="font-size:10.0pt;font-family:"Courier New";color:black">CFLAGS="-fcommon"</span><span class="apple-converted-space"><span style="color:black"> </span></span><span style="color:black">when
running the configure script. However, a more permanent fix would be appreciated.<o:p></o:p></span></p>
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<span style="color:black"> <o:p></o:p></span></p>
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<span style="color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Kav Moradhassel</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"><br>
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