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Hi,</div>
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I often cross compile and there's also <i>some</i> issue! Have you tried passing your library path to <span style="font-family: Calibri, Arial, Helvetica, sans-serif;">-DCMAKE_EXE_LINKER_FLAGS? I've sometimes also used the -B option to override the default
paths.</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif;"><br>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif;">Regards,</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif;">sam</span></div>
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<p style="margin-top: 0px; margin-bottom: 0px;font-family:"Times New Roman""><span style="font-family:Calibri,Helvetica,sans-serif">Sam Parker</span></p>
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<p style="margin-top: 0px; margin-bottom: 0px;font-family:"Times New Roman""><span style="font-family:Calibri,Helvetica,sans-serif">Compilation Tools Engineer | Arm</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of Tobias Hieta via llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Sent:</b> 10 June 2020 05:54<br>
<b>To:</b> Derrick McKee <derrick.mckee@gmail.com><br>
<b>Cc:</b> llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> Re: [llvm-dev] Cross compile x64 to AArch64 issues</font>
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<div dir="auto">Hello,
<div dir="auto"><br>
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<div dir="auto">I would recommend checking the CMake documentation about cross compiling and creating a CMake toolchain file.</div>
<div dir="auto"><br>
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<div dir="auto">The current flags you pass are not instructing CMake about the config checks.</div>
<div dir="auto"><br>
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<div dir="auto"><a href="https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html">https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html</a><br>
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<div dir="auto">Hope this helps!</div>
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<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Tue, Jun 9, 2020, 17:38 Derrick McKee via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<br>
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<blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Hi,<br>
<br>
I am trying to cross compile release-10.x to AArch64<br>
(target=aarch64-linux-gnu), and the directions listed at [1] are not<br>
completing the initial cmake step. I'm currently running Manjaro,<br>
with the aarch64-linux-gnu package (and associated binutils, headers,<br>
and glibc packages). My cmake command is<br>
<br>
cmake -DCMAKE_CROSSCOMPILING=True -DCMAKE_INSTALL_PREFIX=`realpath<br>
install` -DLLVM_TABLEGEN=`realpath<br>
../build-10.x/install/bin/llvm-tblgen`<br>
-DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-linux-gnu<br>
-DLLVM_TARGET_ARCH=AArch64 -DLLVM_TARGETS_TO_BUILD=AArch64<br>
-DCMAKE_CXX_FLAGS="-target aarch64-linux-gnu<br>
--sysroot=/usr/aarch64-linux-gnu<br>
-L/usr/lib/gcc/aarch64-linux-gnu/10.1.0" -DCMAKE_C_COMPILER=`realpath<br>
../build-10.x/install/bin/clang` -DCMAKE_CXX_COMPILER=`realpath<br>
../build-10.x/install/bin/clang++`<br>
-DLLVM_ENABLE_PROJECTS="compiler-rt" -DLLVM_ENABLE_ZLIB=False<br>
-DLLVM_INCLUDE_TESTS=False -G Ninja ../llvm<br>
<br>
Does anyone see any obvious misconfiguration? Cmake fails at the<br>
early test for a working CXX compiler:<br>
<br>
/usr/bin/aarch64-linux-gnu-ld: cannot find crtbegin.o: No such file or directory<br>
<br>
I have confirmed that crtbegin.o exists in /usr/lib/gcc/aarch64-linux-gnu/10.1.0<br>
<br>
If I copy /usr/lib/gcc/aarch64-linux-gnu/10.1.0/{crtbegin,crtend}.o to<br>
/usr/aarch64-linux-gnu/lib the check passed, but then the<br>
LLVM_LIBSTDCXX_MIN check fails. However, checking CMakeErrors.log,<br>
the failing program can be compiled with my system<br>
aarch64-linux-gnu-g++. Barring any misconfiguration, I think that the<br>
build system is not correctly using the sysroot and gcc-toolchain<br>
paths correctly.<br>
<br>
<br>
[1]: <a href="https://llvm.org/docs/HowToCrossCompileLLVM.html" rel="noreferrer noreferrer" target="_blank">
https://llvm.org/docs/HowToCrossCompileLLVM.html</a><br>
<br>
<br>
-- <br>
Derrick McKee<br>
Phone: (703) 957-9362<br>
Email: <a href="mailto:derrick.mckee@gmail.com" target="_blank" rel="noreferrer">
derrick.mckee@gmail.com</a><br>
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</blockquote>
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