<div dir="ltr"><div>I've managed to get 10.0.0 working now.. there were a couple things I had to adjust.</div><div><br></div><div>The Kaleidoscope example had me doing this before creating the object file:</div><div>llvm::InitializeAllTargetInfos();<br>llvm::InitializeAllTargets();<br>llvm::InitializeAllTargetMCs();<br>llvm::InitializeAllAsmParsers();<br>llvm::InitializeAllAsmPrinters();</div><div><br></div><div>It turns out I can get away with just this, since I'm not (yet) worried about targeting other machines:</div><div>llvm::InitializeNativeTarget();<br>llvm::InitializeNativeTargetAsmPrinter();</div><div><br></div><div>Since "all" doesn't work anymore for some reason, I've managed to (through trial and error, guessing at different names shown from llvm-config --components) end up with this set of libnames:</div><div>llvm_map_components_to_libnames(llvm_libs core executionengine support nativecodegen)</div><div><br></div><div></div><div>That left me with 2 link errors referring to llvm::raw_ostream and llvm::raw_pwrite_stream. After much more digging through similar complaints on the internet.. the last fix turned out to be adding this to CMakeLists.txt:</div><div></div><div>set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")</div><div><br></div><div>I am a little worried that the rtti flag may come back and bite me later when I get around to building this on windows again (since I do use exceptions), but that's a problem for another day.<br></div><div><br></div><div><br></div><div>One last question.. is there a good way to know which libnames I need, based on which #includes I pull in or which classes I'm using? I didn't see anything obvious in the doxygen documentation.</div><div><br></div><div><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 15, 2020 at 8:57 PM Rarrum <<a href="mailto:rarrum@gmail.com">rarrum@gmail.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"><div>I'd rather avoid updating my OS at the moment or setting up a VM. But the cmake comments were a hint.. I suspect something is going wrong in there preventing it from adding the actual library files to the linker commandline.</div><div><br></div><div>I added this to my CMakeLists.txt:</div><div>set(CMAKE_VERBOSE_MAKEFILE on)</div><div><br></div><div>Which shows no LLVM libs at all being passed in:<br></div><div><br></div><div>[ 8%] Linking CXX executable ../bin/CBreakCompiler<br>/usr/bin/c++ CMakeFiles/CBreakCompiler.dir/src/main.cpp.o CMakeFiles/CBreakCompiler.dir/src/Parser.cpp.o CMakeFiles/CBreakCompiler.dir/src/SourceTokenizer.cpp.o CMakeFiles/CBreakCompiler.dir/src/IRCompiler.cpp.o CMakeFiles/CBreakCompiler.dir/src/CompiledOutput.cpp.o CMakeFiles/CBreakCompiler.dir/src/JIT.cpp.o -o ../bin/CBreakCompiler</div><div><br></div><div>If I change this:</div><div>llvm_map_components_to_libnames(llvm_libs all)</div><div>to:</div><div>llvm_map_components_to_libnames(llvm_libs core)</div><div><br></div><div>Then I start to see libraries being added:</div><div>[ 8%] Linking CXX executable ../bin/CBreakCompiler<br>/usr/bin/c++ CMakeFiles/CBreakCompiler.dir/src/main.cpp.o CMakeFiles/CBreakCompiler.dir/src/Parser.cpp.o CMakeFiles/CBreakCompiler.dir/src/SourceTokenizer.cpp.o CMakeFiles/CBreakCompiler.dir/src/IRCompiler.cpp.o CMakeFiles/CBreakCompiler.dir/src/CompiledOutput.cpp.o CMakeFiles/CBreakCompiler.dir/src/JIT.cpp.o -o ../bin/CBreakCompiler /usr/local/lib/libLLVMCore.a /usr/local/lib/libLLVMBinaryFormat.a /usr/local/lib/libLLVMRemarks.a /usr/local/lib/libLLVMBitstreamReader.a /usr/local/lib/libLLVMSupport.a -lrt -ldl -ltinfo -lpthread -lm /usr/local/lib/libLLVMDemangle.a</div><div><br></div><div>Perhaps I can figure out which ones I need and manually specify them all, rather than using "all".<br></div><div><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 15, 2020 at 8:17 PM Mehdi AMINI <<a href="mailto:joker.eph@gmail.com" target="_blank">joker.eph@gmail.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"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 15, 2020 at 6:53 PM Neil Nelson via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</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>
<p>Rarrum,<br>
</p>
<p>Kubuntu 20.04 LTS is available. You may be able to upgrade to
19.10, and then to 20.04 without reinstalling. It can be done on
Xubuntu. A direct upgrade to 20.04 should become available. LLVM
10 then installs from the distribution packages. I put all this on
a VM using KVM/QEMU to keep it isolated from my primary desktop
environment. Building a 20.04 VM after upgrading to 20.04 appears
to give a faster VM. Use llvm's linker lld.</p>
<p>The cmake version for 20.04 is 3.16.3 which should help with
llvm's recommended version.</p></div></blockquote><div><br></div><div>Do you believe the error listed have to do with the CMake version?</div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<p>Neil<br>
</p>
<div>On 5/15/20 12:05 AM, Rarrum via
llvm-dev wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">I decided to start playing around with building my
own programming language recently, and to use LLVM to handle the
assembly-level details. I'm on Kubuntu 18.04, and I started out
using LLVM 6.0 from Kubuntu's packages. I put together code for
dealing with my language, then went over the Kaleidoscope
tutorials (which have been extremely helpful btw!). I was able
to successfully get my own compiler to generate IR using LLVM,
use PassManager to write that to a native .o file, use gcc to
link that, and execute a tiny program written in my own
language.<br>
<br>
I also decided it was a good time to learn CMake, so I set up my
project using that. The CMakeLists.txt file I'm using is
essentially just taken from: <a href="https://llvm.org/docs/CMake.html#embedding-llvm-in-your-project" target="_blank">https://llvm.org/docs/CMake.html#embedding-llvm-in-your-project</a>
- though originally it would not link. From scouring the
internet I made 2 changes to get that working: replaced "support
core irreader" with "all", and replaced "${llvm_libs}" with just
"LLVM".<br>
<br>
However as I was starting to play with setting up JIT, I hit
more differences between the version of LLVM in Kubuntu and the
version the examples and documentation were written against. So
I decided to try to update to a newer version of LLVM.. and this
is where I've been stuck for several days now. Here are the
steps I've taken:<br>
<br>
* Uninstalled any llvm packages I could find from Kubuntu's
package manager.<br>
* Followed the getting started guide: <a href="https://llvm.org/docs/GettingStarted.html" target="_blank">https://llvm.org/docs/GettingStarted.html</a>
- I git cloned LLVM, checked out the 10.0.0 tag, ran cmake as
instructed, with the Release type. When that completed
successfully I ran sudo ninja install.<br>
* I then went back to my project and adjusted a couple places to
successfully compile against the new version.<br>
* At this point I put "${llvm_libs}" in the CMakeLists.txt file
back to match the example. However I was getting a massive wall
of link errors.<br>
* I assumed I must have built LLVM incorrectly somehow, so in an
effort to undo that install, I deleted everything I could find
under /usr/local that had LLVM in its name, downloaded the 10.0
release from <a href="https://releases.llvm.org/download.html" target="_blank">https://releases.llvm.org/download.html</a>
for ubuntu 18.04, and extracted that all to /usr/local.<br>
* I can still successfully compile, but not link.<br>
<br>
At this point I'm not sure what to try next. Is there
additional documentation somewhere for how to "install" a
current release of LLVM correctly?<br>
<br>
<br>
For reference here's my final CMakeLists.txt file:<br>
<br>
cmake_minimum_required(VERSION 3.10)<br>
<br>
project(CBreakCompiler)<br>
<br>
set(CMAKE_CXX_STANDARD 17)<br>
set(CMAKE_CXX_STANDARD_REQUIRED True)<br>
add_compile_options(-Wall)<br>
<br>
find_package(LLVM 10.0.0 REQUIRED CONFIG)<br>
<br>
message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")<br>
message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")<br>
<br>
include_directories(${LLVM_INCLUDE_DIRS})<br>
add_definitions(${LLVM_DEFINITIONS})<br>
<br>
add_executable(CBreakCompiler<br>
src/main.cpp<br>
src/Parser.cpp<br>
src/SourceTokenizer.cpp<br>
src/IRCompiler.cpp<br>
src/CompiledOutput.cpp)<br>
<br>
llvm_map_components_to_libnames(llvm_libs all)<br>
target_link_libraries(CBreakCompiler ${llvm_libs})<br>
<br>
<br>
And a snippet from the cmake output corresponding to those
message lines:<br>
<br>
-- Found LLVM 10.0.0<br>
-- Using LLVMConfig.cmake in: /usr/local/lib/cmake/llvm<br>
<br>
<br>
There are dozens of link errors.. the first few and last few
are:<br>
<br>
CMakeFiles/CBreakCompiler.dir/src/main.cpp.o:(.data.rel+0x0):
undefined reference to `llvm::DisableABIBreakingChecks'<br>
CMakeFiles/CBreakCompiler.dir/src/main.cpp.o: In function
`std::default_delete<llvm::LLVMContext>::operator()(llvm::LLVMContext*)
const':<br>
main.cpp:(.text._ZNKSt14default_deleteIN4llvm11LLVMContextEEclEPS1_[_ZNKSt14default_deleteIN4llvm11LLVMContextEEclEPS1_]+0x1e):
undefined reference to `llvm::LLVMContext::~LLVMContext()'<br>
...<br>
CMakeFiles/CBreakCompiler.dir/src/CompiledOutput.cpp.o:(.<a href="http://data.rel.ro" target="_blank">data.rel.ro</a>+0xe0):
undefined reference to `llvm::raw_ostream::anchor()'<br>
CMakeFiles/CBreakCompiler.dir/src/CompiledOutput.cpp.o:(.<a href="http://data.rel.ro" target="_blank">data.rel.ro</a>+0xf8):
undefined reference to `typeinfo for llvm::raw_pwrite_stream'<br>
CMakeFiles/CBreakCompiler.dir/src/CompiledOutput.cpp.o:(.<a href="http://data.rel.ro" target="_blank">data.rel.ro</a>+0x110):
undefined reference to `typeinfo for llvm::raw_ostream'<br></div></blockquote></div></blockquote><div><br></div><div>Seems like `llvm_map_components_to_libnames` wasn't populated well? </div><div>I'd start by printing `${llvm_libs}` in your CMake to check the output of llvm_map_components_to_libnames, I don't know how the "all" works for external builds? You may have to list the components you need more explicitly instead?</div><div><br></div><div>-- </div><div>Mehdi</div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><blockquote type="cite"><div dir="ltr">
</div>
<br>
<fieldset></fieldset>
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