<div dir="ltr"><div>Teresa,</div><div><br></div>It looks like even if we compile source files with `-fno-builtin` and one of the source files have a definition of `memcpy`, LTO uses the builtin `memcpy` instead of a user-supplied one. Is this an intended behavior?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 16, 2019 at 9:09 PM Rui Ueyama <<a href="mailto:ruiu@google.com">ruiu@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Yeah, it crashes indeed. I can reproduce the problem locally. Let me see what is going on.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 16, 2019 at 9:00 PM Shi, Steven <<a href="mailto:steven.shi@intel.com" target="_blank">steven.shi@intel.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang="EN-US">
<div class="gmail-m_5468222053108538905gmail-m_7491600487313094641WordSection1">
<p class="MsoNormal"><a name="m_5468222053108538905_m_7491600487313094641__MailEndCompose"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">In my previous test case, after add the `-fno-builtin` to clang then build, the lld-link still has same crash as below:<u></u><u></u></span></a></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">$ make<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows
</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:red">-fno-builtin
</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">-c -o main.obj main.c<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows
</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:red">-fno-builtin
</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">-c -o memcpy.obj memcpy.c<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:main.lib main.obj<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:memcpy.lib memcpy.obj<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link" /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Stack dump:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">0. Program arguments: /home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#0 0x000056348d5c185a llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/jshi19/llvm/llvm-project/llvm/lib/Support/Unix/Signals.inc:498:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#1 0x000056348d5bf684 llvm::sys::RunSignalHandlers() /home/jshi19/llvm/llvm-project/llvm/lib/Support/Signals.cpp:68:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#2 0x000056348d5bf7c2 SignalHandler(int) /home/jshi19/llvm/llvm-project/llvm/lib/Support/Unix/Signals.inc:357:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#3 0x00007f200467a890 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#4 0x000056348d614025 lld::coff::DefinedRegular::getChunk() const /home/jshi19/llvm/llvm-project/lld/COFF/Symbols.h:176:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#5 0x000056348d614025 operator() /home/jshi19/llvm/llvm-project/lld/COFF/MarkLive.cpp:46:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#6 0x000056348d614025 lld::coff::markLive(llvm::ArrayRef<lld::coff::Chunk*>) /home/jshi19/llvm/llvm-project/lld/COFF/MarkLive.cpp:55:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#7 0x000056348d5f363e std::vector<lld::coff::Chunk*, std::allocator<lld::coff::Chunk*> >::~vector() /usr/include/c++/7/bits/stl_vector.h:434:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#8 0x000056348d5f363e lld::coff::LinkerDriver::link(llvm::ArrayRef<char const*>) /home/jshi19/llvm/llvm-project/lld/COFF/Driver.cpp:1840:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#9 0x000056348d5f3d08 lld::coff::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&) /home/jshi19/llvm/llvm-project/lld/COFF/Driver.cpp:78:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#10 0x000056348d536044 main /home/jshi19/llvm/llvm-project/lld/tools/lld/lld.cpp:155:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#11 0x00007f2003151b97 __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">#12 0x000056348d5915ba _start (/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link+0x25a5ba)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Segmentation fault (core dumped)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">makefile:9: recipe for target 'build' failed<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">make: *** [build] Error 139<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Steven</span><b><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u><u></u></span></b></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<div style="border-top:none;border-right:none;border-bottom:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><a name="m_5468222053108538905_m_7491600487313094641______replyseparator"></a><b><span style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt;font-family:Calibri,sans-serif"> Rui Ueyama [mailto:<a href="mailto:ruiu@google.com" target="_blank">ruiu@google.com</a>]
<br>
<b>Sent:</b> Tuesday, July 16, 2019 7:53 PM<br>
<b>To:</b> Shi, Steven <<a href="mailto:steven.shi@intel.com" target="_blank">steven.shi@intel.com</a>><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: lld-link crash when build openssl with LTO<u></u><u></u></span></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">lld should not crash in this case (so that's a bug that needs fixing), but setting it aside, did you try adding `-fno-builtin` to clang so that clang doesn't handle `memcpy` as a built-in function?<u></u><u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Tue, Jul 16, 2019 at 8:46 PM Shi, Steven <<a href="mailto:steven.shi@intel.com" target="_blank">steven.shi@intel.com</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"><a name="m_5468222053108538905_m_7491600487313094641_m_-3824946253732539121__MailEndCompose"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi Rui,</span></a><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">For the test case in my previous email, if I change the `memcpy` to `foobar` in memcpy.c, the lld-link
report linking error that it cannot find the _memcpy symbol as below. In uefi firmware, we have to explicitly implement these compiler intrinsic functions by ourselves.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">jshi19@ub2-uefi-b01:~/llvm/wrongcode/lld-link3$ make</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c
-o main.obj main.c</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c
-o memcpy.obj memcpy.c</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:main.lib main.obj</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:memcpy.lib memcpy.obj</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link" /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint
main.lib memcpy.lib</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:red">lld-link: error: undefined symbol: _memcpy</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">>>> referenced by lto.tmp:(_TlsDriverEntryPoint)</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">makefile:9: recipe for target 'build' failed</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">make: *** [build] Error 1</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanks</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Steven</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span><u></u><u></u></p>
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<div>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><a name="m_5468222053108538905_m_7491600487313094641_m_-3824946253732539121______replyseparat"></a><b><span style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt;font-family:Calibri,sans-serif">
Rui Ueyama [mailto:<a href="mailto:ruiu@google.com" target="_blank">ruiu@google.com</a>]
<br>
<b>Sent:</b> Tuesday, July 16, 2019 6:30 PM<br>
<b>To:</b> Shi, Steven <<a href="mailto:steven.shi@intel.com" target="_blank">steven.shi@intel.com</a>><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: lld-link crash when build openssl with LTO</span><u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<p class="MsoNormal">Hi Steven,<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">One thing I noticed is that you are defining `memcpy`, which clang has an intrinsic with the same name. Can you try renaming it to a random name, like `foobar`, to see if the problem
still exists?<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<div>
<p class="MsoNormal">On Tue, Jul 16, 2019 at 10:10 AM Shi, Steven <<a href="mailto:steven.shi@intel.com" target="_blank">steven.shi@intel.com</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<div>
<div>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">I’ve submitted a BZ for this issue as below:</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p style="margin:0in 0in 0.0001pt"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:black">Bug 42626 - lld-link crash when build openssl with LTO</span><u></u><u></u></p>
<p style="margin:0in 0in 0.0001pt"><a href="https://bugs.llvm.org/show_bug.cgi?id=42626" target="_blank"><span style="font-size:11pt;font-family:Calibri,sans-serif">https://bugs.llvm.org/show_bug.cgi?id=42626</span></a><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<div>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Thanks</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Steven</span><u></u><u></u></p>
</div>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"> </span><u></u><u></u></p>
<div style="border-top:none;border-right:none;border-bottom:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><a name="m_5468222053108538905_m_7491600487313094641_m_-3824946253732539121_m_731255561267743"></a><b>From:</b> llvm-dev [mailto:<a href="mailto:llvm-dev-bounces@lists.llvm.org" target="_blank">llvm-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Shi, Steven via llvm-dev<br>
<b>Sent:</b> Monday, July 15, 2019 4:40 PM<br>
<b>To:</b> 'Rui Ueyama' <<a href="mailto:ruiu@google.com" target="_blank">ruiu@google.com</a>><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> [llvm-dev] lld-link crash when build openssl with LTO<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Hi Rui,<u></u><u></u></p>
<p class="MsoNormal">We met a lld-link crash problem when build 32bits openssl1.0 with LTO in uefi firmware. We narrow down and figure out a simple test case to reproduce this problem as blow. Please
advise. Thank you!<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">$ cat main.c<u></u><u></u></p>
<p class="MsoNormal">void TlsDriverEntryPoint ()<u></u><u></u></p>
<p class="MsoNormal">{<u></u><u></u></p>
<p class="MsoNormal"> unsigned char *ret = 0;<u></u><u></u></p>
<p class="MsoNormal"> const unsigned char cryptopro_ext[17] = {0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01};<u></u><u></u></p>
<p class="MsoNormal"> int length =17;<u></u><u></u></p>
<p class="MsoNormal"> const char *Source;<u></u><u></u></p>
<p class="MsoNormal"> Source = (void*)cryptopro_ext;<u></u><u></u></p>
<p class="MsoNormal"> while (length--) {<u></u><u></u></p>
<p class="MsoNormal"> *(ret++) = *(Source++);<u></u><u></u></p>
<p class="MsoNormal"> }<u></u><u></u></p>
<p class="MsoNormal">}<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">$ cat memcpy.c<u></u><u></u></p>
<p class="MsoNormal">typedef unsigned int size_t;<u></u><u></u></p>
<p class="MsoNormal">void *memcpy(void *dest, const void *src, size_t n)<u></u><u></u></p>
<p class="MsoNormal">{<u></u><u></u></p>
<p class="MsoNormal"> return 0;<u></u><u></u></p>
<p class="MsoNormal">}<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">$ cat makefile<u></u><u></u></p>
<p class="MsoNormal">CC_FLAGS= -Oz -flto -target i686-unknown-windows<u></u><u></u></p>
<p class="MsoNormal">CC = /home/jshi19/llvm/llvm-project/releaseinstall/bin/clang<u></u><u></u></p>
<p class="MsoNormal">DLINK_FLAGS = /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint<u></u><u></u></p>
<p class="MsoNormal">DLINK = /home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link<u></u><u></u></p>
<p class="MsoNormal">SLINK_FLAGS =<u></u><u></u></p>
<p class="MsoNormal">SLINK = /home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">build:<u></u><u></u></p>
<p class="MsoNormal"> "$(CC)" $(CC_FLAGS) -c -o main.obj main.c<u></u><u></u></p>
<p class="MsoNormal"> "$(CC)" $(CC_FLAGS) -c -o memcpy.obj memcpy.c<u></u><u></u></p>
<p class="MsoNormal"> "$(SLINK)" $(SLINK_FLAGS) /OUT:main.lib main.obj<u></u><u></u></p>
<p class="MsoNormal"> "$(SLINK)" $(SLINK_FLAGS) /OUT:memcpy.lib memcpy.obj<u></u><u></u></p>
<p class="MsoNormal"> "$(DLINK)" /OUT:f.dll $(DLINK_FLAGS) main.lib memcpy.lib<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">$ make<u></u><u></u></p>
<p class="MsoNormal">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c -o main.obj main.c<u></u><u></u></p>
<p class="MsoNormal">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c -o memcpy.obj memcpy.c<u></u><u></u></p>
<p class="MsoNormal">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:main.lib main.obj<u></u><u></u></p>
<p class="MsoNormal">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:memcpy.lib memcpy.obj<u></u><u></u></p>
<p class="MsoNormal">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link" /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<u></u><u></u></p>
<p class="MsoNormal">Stack dump:<u></u><u></u></p>
<p class="MsoNormal">0. Program arguments: /home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<u></u><u></u></p>
<p class="MsoNormal">#0 0x000055f11ed8585a llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/jshi19/llvm/llvm-project/llvm/lib/Support/Unix/Signals.inc:498:0<u></u><u></u></p>
<p class="MsoNormal">#1 0x000055f11ed83684 llvm::sys::RunSignalHandlers() /home/jshi19/llvm/llvm-project/llvm/lib/Support/Signals.cpp:68:0<u></u><u></u></p>
<p class="MsoNormal">#2 0x000055f11ed837c2 SignalHandler(int) /home/jshi19/llvm/llvm-project/llvm/lib/Support/Unix/Signals.inc:357:0<u></u><u></u></p>
<p class="MsoNormal">#3 0x00007f172a5f2890 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)<u></u><u></u></p>
<p class="MsoNormal">#4 0x000055f11edd8025 lld::coff::DefinedRegular::getChunk() const /home/jshi19/llvm/llvm-project/lld/COFF/Symbols.h:176:0<u></u><u></u></p>
<p class="MsoNormal">#5 0x000055f11edd8025 operator() /home/jshi19/llvm/llvm-project/lld/COFF/MarkLive.cpp:46:0<u></u><u></u></p>
<p class="MsoNormal">#6 0x000055f11edd8025 lld::coff::markLive(llvm::ArrayRef<lld::coff::Chunk*>) /home/jshi19/llvm/llvm-project/lld/COFF/MarkLive.cpp:55:0<u></u><u></u></p>
<p class="MsoNormal">#7 0x000055f11edb763e std::vector<lld::coff::Chunk*, std::allocator<lld::coff::Chunk*> >::~vector() /usr/include/c++/7/bits/stl_vector.h:434:0<u></u><u></u></p>
<p class="MsoNormal">#8 0x000055f11edb763e lld::coff::LinkerDriver::link(llvm::ArrayRef<char const*>) /home/jshi19/llvm/llvm-project/lld/COFF/Driver.cpp:1840:0<u></u><u></u></p>
<p class="MsoNormal">#9 0x000055f11edb7d08 lld::coff::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&) /home/jshi19/llvm/llvm-project/lld/COFF/Driver.cpp:78:0<u></u><u></u></p>
<p class="MsoNormal">#10 0x000055f11ecfa044 main /home/jshi19/llvm/llvm-project/lld/tools/lld/lld.cpp:155:0<u></u><u></u></p>
<p class="MsoNormal">#11 0x00007f17290c9b97 __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0<u></u><u></u></p>
<p class="MsoNormal">#12 0x000055f11ed555ba _start (/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link+0x25a5ba)<u></u><u></u></p>
<p class="MsoNormal">Segmentation fault (core dumped)<u></u><u></u></p>
<p class="MsoNormal">makefile:12: recipe for target 'build' failed<u></u><u></u></p>
<p class="MsoNormal">make: *** [build] Error 139<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Steven<u></u><u></u></p>
<p class="MsoNormal">Thanks<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
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