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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Rui,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">jshi19@ub2-uefi-b01:~/llvm/wrongcode/lld-link3$ make<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c -o main.obj main.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c -o memcpy.obj memcpy.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:main.lib main.obj<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:memcpy.lib memcpy.obj<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link" /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">lld-link: error: undefined symbol: _memcpy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">>>> referenced by lto.tmp:(_TlsDriverEntryPoint)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">makefile:9: recipe for target 'build' failed<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">make: *** [build] Error 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Steven<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Rui Ueyama [mailto:ruiu@google.com]
<br>
<b>Sent:</b> Tuesday, July 16, 2019 6:30 PM<br>
<b>To:</b> Shi, Steven <steven.shi@intel.com><br>
<b>Cc:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> Re: lld-link crash when build openssl with LTO<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Steven,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<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?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Jul 16, 2019 at 10:10 AM Shi, Steven <<a href="mailto:steven.shi@intel.com">steven.shi@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_7312555612677439490__MailEndCompose"><span style="color:#1F497D">I’ve submitted a BZ for this issue as below:</span></a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Bug 42626 - lld-link crash when build openssl with LTO</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><a href="https://bugs.llvm.org/show_bug.cgi?id=42626" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">https://bugs.llvm.org/show_bug.cgi?id=42626</span></a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Steven</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_7312555612677439490______replyseparato"></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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi Rui,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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!<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">$ cat main.c<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">void TlsDriverEntryPoint ()<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">{<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> unsigned char *ret = 0;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> const unsigned char cryptopro_ext[17] = {0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01};<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> int length =17;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> const char *Source;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Source = (void*)cryptopro_ext;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> while (length--) {<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> *(ret++) = *(Source++);<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> }<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">}<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">$ cat memcpy.c<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">typedef unsigned int size_t;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">void *memcpy(void *dest, const void *src, size_t n)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">{<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> return 0;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">}<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">$ cat makefile<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">CC_FLAGS= -Oz -flto -target i686-unknown-windows<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">CC = /home/jshi19/llvm/llvm-project/releaseinstall/bin/clang<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">DLINK_FLAGS = /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">DLINK = /home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">SLINK_FLAGS =<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">SLINK = /home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">build:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> "$(CC)" $(CC_FLAGS) -c -o main.obj main.c<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> "$(CC)" $(CC_FLAGS) -c -o memcpy.obj memcpy.c<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> "$(SLINK)" $(SLINK_FLAGS) /OUT:main.lib main.obj<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> "$(SLINK)" $(SLINK_FLAGS) /OUT:memcpy.lib memcpy.obj<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> "$(DLINK)" /OUT:f.dll $(DLINK_FLAGS) main.lib memcpy.lib<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">$ make<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c -o main.obj main.c<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/clang" -Oz -flto -target i686-unknown-windows -c -o memcpy.obj memcpy.c<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:main.lib main.obj<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/llvm-lib" /OUT:memcpy.lib memcpy.obj<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">"/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link" /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Stack dump:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">0. Program arguments: /home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link /OUT:f.dll /MACHINE:X86 /DLL /ENTRY:TlsDriverEntryPoint main.lib memcpy.lib<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#0 0x000055f11ed8585a llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/jshi19/llvm/llvm-project/llvm/lib/Support/Unix/Signals.inc:498:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#1 0x000055f11ed83684 llvm::sys::RunSignalHandlers() /home/jshi19/llvm/llvm-project/llvm/lib/Support/Signals.cpp:68:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#2 0x000055f11ed837c2 SignalHandler(int) /home/jshi19/llvm/llvm-project/llvm/lib/Support/Unix/Signals.inc:357:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#3 0x00007f172a5f2890 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#4 0x000055f11edd8025 lld::coff::DefinedRegular::getChunk() const /home/jshi19/llvm/llvm-project/lld/COFF/Symbols.h:176:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#5 0x000055f11edd8025 operator() /home/jshi19/llvm/llvm-project/lld/COFF/MarkLive.cpp:46:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#6 0x000055f11edd8025 lld::coff::markLive(llvm::ArrayRef<lld::coff::Chunk*>) /home/jshi19/llvm/llvm-project/lld/COFF/MarkLive.cpp:55:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#7 0x000055f11edb763e std::vector<lld::coff::Chunk*, std::allocator<lld::coff::Chunk*> >::~vector() /usr/include/c++/7/bits/stl_vector.h:434:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#8 0x000055f11edb763e lld::coff::LinkerDriver::link(llvm::ArrayRef<char const*>) /home/jshi19/llvm/llvm-project/lld/COFF/Driver.cpp:1840:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#9 0x000055f11edb7d08 lld::coff::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&) /home/jshi19/llvm/llvm-project/lld/COFF/Driver.cpp:78:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#10 0x000055f11ecfa044 main /home/jshi19/llvm/llvm-project/lld/tools/lld/lld.cpp:155:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#11 0x00007f17290c9b97 __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#12 0x000055f11ed555ba _start (/home/jshi19/llvm/llvm-project/releaseinstall/bin/lld-link+0x25a5ba)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Segmentation fault (core dumped)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">makefile:12: recipe for target 'build' failed<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">make: *** [build] Error 139<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Steven<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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