<div dir="ltr">It works for me, but there might be some bug in lld that occurs in your environment but not in mine. Could you run the same command line with -Wl,--reproduce=repro.tar and share a resulting repro.tar with me? repro.tar contanis all input files fed to the linker, so I can run the same command with the same input as yours on my machine.</div><br><div class="gmail_quote"><div dir="ltr">On Wed, Jun 27, 2018 at 2:59 PM Wink Saville 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">Thanks everyone, using "clang++ -v -static main.cpp" as a model worked,<br>
see: <a href="https://github.com/winksaville/explore-cpp-static-linking" rel="noreferrer" target="_blank">https://github.com/winksaville/explore-cpp-static-linking</a><br>
<br>
But a curious thing, if I ask to use lld linker it compiles and links<br>
fine, but it<br>
fails with Segmentation fault. What have I done wrong now?<br>
<br>
$ clang++ -v -fuse-ld=lld -static main.cpp -o main<br>
clang version 6.0.0 (tags/RELEASE_600/final)<br>
Target: x86_64-pc-linux-gnu<br>
Thread model: posix<br>
InstalledDir: /usr/bin<br>
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.1<br>
Found candidate GCC installation:<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1<br>
Found candidate GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1<br>
Found candidate GCC installation: /usr/lib64/gcc/x86_64-pc-linux-gnu/8.1.1<br>
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1<br>
Candidate multilib: .;@m64<br>
Candidate multilib: 32;@m32<br>
Selected multilib: .;@m64<br>
"/usr/bin/clang-6.0" -cc1 -triple x86_64-pc-linux-gnu -emit-obj<br>
-mrelax-all -disable-free -disable-llvm-verifier -discard-value-names<br>
-main-file-name main.cpp -static-define -mrelocation-model pic<br>
-pic-level 2 -pic-is-pie -mthread-model posix -mdisable-fp-elim<br>
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables<br>
-fuse-init-array -target-cpu x86-64 -dwarf-column-info<br>
-debugger-tuning=gdb -v -resource-dir /usr/lib/clang/6.0.0<br>
-internal-isystem<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1<br>
-internal-isystem<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/x86_64-pc-linux-gnu<br>
-internal-isystem<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/backward<br>
-internal-isystem /usr/local/include -internal-isystem<br>
/usr/lib/clang/6.0.0/include -internal-externc-isystem /include<br>
-internal-externc-isystem /usr/include -fdeprecated-macro<br>
-fdebug-compilation-dir /home/wink/prgs/explore-cpp-static-linking<br>
-ferror-limit 19 -fmessage-length 121 -stack-protector 2<br>
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions<br>
-fdiagnostics-show-option -fcolor-diagnostics -o /tmp/main-e6f2d0.o -x<br>
c++ main.cpp<br>
clang -cc1 version 6.0.0 based upon LLVM 6.0.0 default target<br>
x86_64-pc-linux-gnu<br>
ignoring nonexistent directory "/include"<br>
#include "..." search starts here:<br>
#include <...> search starts here:<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/x86_64-pc-linux-gnu<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/backward<br>
/usr/local/include<br>
/usr/lib/clang/6.0.0/include<br>
/usr/include<br>
End of search list.<br>
"/usr/bin/ld.lld" -m elf_x86_64 -static -o main<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/crt1.o<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/crti.o<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/crtbeginT.o<br>
-L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1<br>
-L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64<br>
-L/usr/bin/../lib64 -L/lib/../lib64 -L/usr/lib/../lib64<br>
-L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../..<br>
-L/usr/bin/../lib -L/lib -L/usr/lib /tmp/main-e6f2d0.o -lstdc++ -lm<br>
--start-group -lgcc -lgcc_eh -lc --end-group<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/crtend.o<br>
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/crtn.o<br>
<br>
$ ./main 1 2 3<br>
Segmentation fault (core dumped)<br>
<br>
$ coredumpctl gdb<br>
PID: 5870 (main)<br>
UID: 1000 (wink)<br>
GID: 100 (users)<br>
Signal: 11 (SEGV)<br>
Timestamp: Tue 2018-06-26 22:40:56 PDT (6s ago)<br>
Command Line: ./main 1 2 3<br>
Executable: /home/wink/prgs/explore-cpp-static-linking/main<br>
Control Group: /user.slice/user-1000.slice/session-c2.scope<br>
Unit: session-c2.scope<br>
Slice: user-1000.slice<br>
Session: c2<br>
Owner UID: 1000 (wink)<br>
Boot ID: 65910f0244bf4b62905c0198842b62d4<br>
Machine ID: 8f80fd742eae4659baed812cd07a9439<br>
Hostname: wink-desktop<br>
Storage:<br>
/var/lib/systemd/coredump/core.main.1000.65910f0244bf4b62905c0198842b62d4.5870.1530078056000000.lz4<br>
Message: Process 5870 (main) of user 1000 dumped core.<br>
<br>
Stack trace of thread 5870:<br>
#0 0x0000000000383dc6 n/a<br>
(/home/wink/prgs/explore-cpp-static-linking/main)<br>
<br>
GNU gdb (GDB) 8.1<br>
Copyright (C) 2018 Free Software Foundation, Inc.<br>
License GPLv3+: GNU GPL version 3 or later <<a href="http://gnu.org/licenses/gpl.html" rel="noreferrer" target="_blank">http://gnu.org/licenses/gpl.html</a>><br>
This is free software: you are free to change and redistribute it.<br>
There is NO WARRANTY, to the extent permitted by law. Type "show copying"<br>
and "show warranty" for details.<br>
This GDB was configured as "x86_64-pc-linux-gnu".<br>
Type "show configuration" for configuration details.<br>
For bug reporting instructions, please see:<br>
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Find the GDB manual and other documentation resources online at:<br>
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For help, type "help".<br>
Type "apropos word" to search for commands related to "word"...<br>
Reading symbols from<br>
/home/wink/prgs/explore-cpp-static-linking/main...(no debugging<br>
symbols found)...done.<br>
[New LWP 5870]<br>
Core was generated by `./main 1 2 3'.<br>
Program terminated with signal SIGSEGV, Segmentation fault.<br>
#0 0x0000000000383dc6 in _dl_get_origin ()<br>
(gdb) bt<br>
#0 0x0000000000383dc6 in _dl_get_origin ()<br>
#1 0x000000000038342f in _dl_non_dynamic_init ()<br>
#2 0x00000000002eecd1 in __libc_init_first ()<br>
#3 0x00000000002ee9c7 in __libc_start_main ()<br>
#4 0x000000000025302a in _start ()<br>
<br>
On Tue, Jun 26, 2018 at 2:58 PM, Joerg Sonnenberger via cfe-dev<br>
<<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>> wrote:<br>
> On Tue, Jun 26, 2018 at 09:36:18PM +0000, Shoaib Meenai via cfe-dev wrote:<br>
>> I do see that you're linking all the start files yourself, but the<br>
>> ordering can also make a difference.<br>
><br>
> crt0.o / crt1.o was missing.<br>
><br>
> Joerg<br>
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</blockquote></div>