<div dir="ltr">Does it help to pass the following to the clang command line: --gcc-toolchain=<span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">/home/repo/jdx/wr8-baytrail_</span><span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">64/buildbox/usr/lib64 ?</span></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Apr 18, 2018 at 7:52 AM Miller Henry via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I’m building for an embedded system, this is working fine with gcc 5.2.0, but I’ve become interested in clang. In 3.9.1 everything builds fine (once I fixed the real bugs – thank you to everyone who wrote useful warnings). I’m interested
in trying clang 6.0.0, and there things don’t build.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The first error I get is is from cmake:<u></u><u></u></p>
<p class="MsoNormal"> [2/2] Linking C executable cmTC_03cd5<u></u><u></u></p>
<p class="MsoNormal">FAILED: cmTC_03cd5 <u></u><u></u></p>
<p class="MsoNormal"> : && /opt/jdx/tools//usr/local/share/icecc/bin//clang --sysroot=/home/user/repo/jdx/wr8-baytrail_64/buildbox -fno-omit-frame-pointer -gsplit-dwarf -fdiagnostics-color=always --target=x86_64-wrs-linux --sysroot=/home/repo/jdx/wr8-baytrail_64/buildbox
-rdynamic -O2 -L/home/repo/jdx/wr8-baytrail_64/buildbox/usr/local/lib -Wl,--gdb-index -lrt -lpthread -Wl,--disable-new-dtags CMakeFiles/cmTC_03cd5.dir/testCCompiler.c.o -o cmTC_03cd5 && :<u></u><u></u></p>
<p class="MsoNormal">/opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld: error: cannot open crtbegin.o: No such file or directory<u></u><u></u></p>
<p class="MsoNormal">/opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld: error: cannot open crtend.o: No such file or directory<u></u><u></u></p>
<p class="MsoNormal"> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld: error: cannot find -lgcc<u></u><u></u></p>
<p class="MsoNormal"> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld: error: cannot find -lgcc<u></u><u></u></p>
<p class="MsoNormal"> clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">crtbegin.o is in /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib64/x86_64-wrs-linux/5.2.0/crtbegin.o When I copy the missing files to /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib64 cmake passes and but the build fails on unable to find
<string> and <vector>, I started to add include paths for jdx/wr8-baytrail_64/buildbox/usr/include/c++/5.2.0/ and that gets farther. However it is time to stop hacking the wrong way and fix the real problem. I suspect the problem is related to clang not understanding
my --target option and thus not asking gcc for the paths to the missing files, but I don’t really know how to make this work.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">A search finds <a href="https://stackoverflow.com/questions/4160262/clang-linker-problem" target="_blank">
https://stackoverflow.com/questions/4160262/clang-linker-problem</a>, but it isn’t helpful because the code in that area has changed so much.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">My host is x86-64 linux. The target OS is x86_64 embedded linux (the sysroot is NOT compatible with the host libraries)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Can someone give me a hint about where I should look to make this work. I can change either the command line arguments or the clang source code but I’m not clear on where the right place to look is.<u></u><u></u></p>
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