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<div class="moz-cite-prefix">A simpler way might be to get ELLCC
(<a class="moz-txt-link-freetext" href="http://ellcc.org">http://ellcc.org</a>):<br>
<br>
rich@dev:~$ ~/ellcc/bin/ecc -target arm64v8-linux hello.c<br>
rich@dev:~$ file a.out<br>
a.out: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV),
statically linked, not stripped<br>
rich@dev:~$ ~/ellcc/bin/qemu-aarch64 a.out<br>
hello world<br>
rich@dev:~$<br>
<br>
ELLCC includes all the stuff you need: libraries, linker, etc.<br>
<br>
That was on an x86_64 system.<br>
<br>
-Rich<br>
<br>
On 11/02/2016 02:49 AM, via llvm-dev wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hello list</span></p>
<p class="MsoNormal"><span lang="EN-US">I have some problems
when using x86 cross-compile the arm progress.</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">First I know a way to
get aarch64 binary in x86 with llvm/clang.</span></p>
<p class="MsoNormal"><span lang="EN-US">There need two things
prepared for cross-compile.</span></p>
<div>
<pre style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span lang="EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]--><span lang="EN-US">GUN ARM toolchain </span><span style="font-family:Wingdings" lang="EN-US">à</span><span lang="EN-US"> apt-get install <span style="color:black">gcc-arm-linux-gnueabi<o:p></o:p></span></span></pre>
<div>
<pre style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span lang="EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]--><span style="color:black" lang="EN-US">Clang/llvm compile </span><span style="font-family:Wingdings;color:black" lang="EN-US">à</span><span style="color:black" lang="EN-US"> <a moz-do-not-send="true" href="http://clang.llvm.org/get_started.html">http://clang.llvm.org/get_started.html</a><o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">clang -emit-llvm -target aarch64 helloworld.c -I /usr/aarch64-linux-gnu/include -c <o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">(can get helloworld.bc)<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">llc helloworld.bc -o helloworld.s<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">aarch64-linux-gnu-gcc helloworld.s -o helloworld<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">From the cmd above, I can get the aarch64 binary which is function well in aarch64 machine.<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">But, Is there other way that I can get aarch64 without gcc.<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">When I try to use below:<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">clang -v -target arm-linux-gnueabi --sysroot=/usr/arm-linux-gnueabi/ helloworld.c -o hello <o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">I get:<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Obfuscator-LLVM clang version 3.6.1 (tags/RELEASE_361/final) (based on Obfuscator-LLVM 3.6.1)<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Target: arm--linux-gnueabi<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Thread model: posix<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> "/usr/local/bin/clang-3.6" -cc1 -triple armv4t--linux-gnueabi -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name arm.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -target-cpu arm7tdmi -target-feature +soft-float-abi -target-abi aapcs-linux -mfloat-abi soft -v -dwarf-column-info -resource-dir /usr/local/bin/../lib/clang/3.6.1 -isysroot /usr/arm-linux-gnueabi/ -internal-isystem /usr/arm-linux-gnueabi//usr/local/include -internal-isystem /usr/local/bin/../lib/clang/3.6.1/include -internal-externc-isystem /usr/arm-linux-gnueabi//include -internal-externc-isystem /usr/arm-linux-gnueabi//usr/include -fdebug-compilation-dir /home/zyj/Desktop -ferror-limit 19 -fmessage-length 80 -mstackrealign -fno-signed-char -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/helloworld-6b36a6.o -x c helloworld.c<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">clang -cc1 version 3.6.1 based upon Obfuscator-LLVM 3.6.1 default target i386-pc-linux-gnu<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">ignoring nonexistent directory "/usr/arm-linux-gnueabi//usr/local/include"<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">ignoring nonexistent directory "/usr/arm-linux-gnueabi//usr/include"<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">#include "..." search starts here:<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">#include <...> search starts here:<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> /usr/local/bin/../lib/clang/3.6.1/include<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> /usr/arm-linux-gnueabi//include<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">End of search list.<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> "/usr/local/bin/ld" --sysroot=/usr/arm-linux-gnueabi/ -z relro -X --hash-style=gnu --build-id --eh-frame-hdr -m armelf_linux_eabi -dynamic-linker /lib/ld-linux.so.3 -o hello /usr/arm-linux-gnueabi//lib/../lib/crt1.o /usr/arm-linux-gnueabi//lib/../lib/crti.o crtbegin.o -L/usr/arm-linux-gnueabi//lib/../lib -L/usr/arm-linux-gnueabi//lib /tmp/helloworld-6b36a6.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed crtend.o /usr/arm-linux-gnueabi//lib/../lib/crtn.o<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: unrecognised emulation mode: armelf_linux_eabi<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Supported emulations: elf_i386 i386linux elf32_x86_64 elf_x86_64 elf_l1om elf_k1om i386pep i386pe<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">clang-3.6: error: linker command failed with exit code 1 (use -v to see invocation)<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">This seems that linker is wrong, so I change the ld point to /usr/arm-linux-gnueabi/bin/ld<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">(using: ln -s /usr/arm-linux-gnueabi/bin/ld ld)<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">But I get anther question<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Obfuscator-LLVM clang version 3.6.1 (tags/RELEASE_361/final) (based on Obfuscator-LLVM 3.6.1)<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Target: arm--linux-gnueabi<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Thread model: posix<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> "/usr/local/bin/clang-3.6" -cc1 -triple armv4t--linux-gnueabi -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name arm.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -target-cpu arm7tdmi -target-feature +soft-float-abi -target-abi aapcs-linux -mfloat-abi soft -v -dwarf-column-info -resource-dir /usr/local/bin/../lib/clang/3.6.1 -isysroot /usr/arm-linux-gnueabi/ -internal-isystem /usr/arm-linux-gnueabi//usr/local/include -internal-isystem /usr/local/bin/../lib/clang/3.6.1/include -internal-externc-isystem /usr/arm-linux-gnueabi//include -internal-externc-isystem /usr/arm-linux-gnueabi//usr/include -fdebug-compilation-dir /home/zyj/Desktop -ferror-limit 19 -fmessage-length 80 -mstackrealign -fno-signed-char -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/helloworld-fa5b7f.o -x c helloworld.c<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">clang -cc1 version 3.6.1 based upon Obfuscator-LLVM 3.6.1 default target i386-pc-linux-gnu<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">ignoring nonexistent directory "/usr/arm-linux-gnueabi//usr/local/include"<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">ignoring nonexistent directory "/usr/arm-linux-gnueabi//usr/include"<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">#include "..." search starts here:<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">#include <...> search starts here:<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> /usr/local/bin/../lib/clang/3.6.1/include<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> /usr/arm-linux-gnueabi//include<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">End of search list.<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"> "/usr/local/bin/ld" --sysroot=/usr/arm-linux-gnueabi/ -z relro -X --hash-style=gnu --build-id --eh-frame-hdr -m armelf_linux_eabi -dynamic-linker /lib/ld-linux.so.3 -o hello /usr/arm-linux-gnueabi//lib/../lib/crt1.o /usr/arm-linux-gnueabi//lib/../lib/crti.o crtbegin.o -L/usr/arm-linux-gnueabi//lib/../lib -L/usr/arm-linux-gnueabi//lib /tmp/helloworld-fa5b7f.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed crtend.o /usr/arm-linux-gnueabi//lib/../lib/crtn.o<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find crtbegin.o: No such file or directory<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find -lgcc<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find -lgcc_s<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find /usr/arm-linux-gnueabi/lib/libc.so.6 inside /usr/arm-linux-gnueabi/<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find /usr/arm-linux-gnueabi/lib/libc_nonshared.a inside /usr/arm-linux-gnueabi/<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find /usr/arm-linux-gnueabi/lib/ld-linux.so.3 inside /usr/arm-linux-gnueabi/<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">clang-3.6: error: linker command failed with exit code 1 (use -v to see invocation)<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">From above message I am confused about the:<o:p></o:p></span></pre>
</div>
</div>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find crtbegin.o: No such file or directory<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find -lgcc<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find -lgcc_s<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find /usr/arm-linux-gnueabi/lib/libc.so.6 inside /usr/arm-linux-gnueabi/<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find /usr/arm-linux-gnueabi/lib/libc_nonshared.a inside /usr/arm-linux-gnueabi/<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">/usr/local/bin/ld: cannot find /usr/arm-linux-gnueabi/lib/ld-linux.so.3 inside /usr/arm-linux-gnueabi/<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:black" lang="EN-US">While all these lib is at the right location, why error says ld cannot find them.<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">If you need more imformation from me, please let me know.<o:p></o:p></span></pre>
<pre><span style="color:black" lang="EN-US">Thanks<o:p></o:p></span></pre>
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