similar to: Compiling compiler-rt for baremetal CortexM on Ubuntu Linux

Hi, I am trying to use LLVM/clang to build a binary for ARM Cortex M platforms. When I build my binary the linker fails to find these libraries. ./bin/clang++ -target arm-none-eabi -mcpu=cortex-m4 ./temp.cpp -L ./lib/ -L ./libexec/ -L ../build3_v7m/lib/ ld.lld: error: unable to find library -lunwind ld.lld: error: unable to find library -lc ld.lld: error: unable to find library -lm ld.lld: error:

On Fri, Aug 04, 2017 at 04:03:35PM -0600, Jonathan Roelofs wrote: > > > 1) Pick a directory as your sysroot > > ~/arm-sysroot > > > > > 2) Install the libc headers there (without having built it) > > What I did was mv musl-*/include ~/arm-sysroot/usr/include. > > I think you need to copy them, not move them. On a new directories and fresh untar of musl, I

Hi Peter, On Wed, 26 Feb 2020 at 18:37, Peter Smith via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Hello Arslan, > > > I am guessing I can borrow libraries such as lc and lm from GCC > > arm-none-eabi*, but for clang_rt.builtins-arm.a (which I thought > > should've been built with LLVM build but I couldn't find that library > > in my build

On Fri, Aug 04, 2017 at 01:54:33PM -0600, Jonathan Roelofs wrote: > > > On 8/4/17 1:14 PM, Goran Mekić via llvm-dev wrote: > > On Thu, Aug 03, 2017 at 08:22:24AM -0600, Jonathan Roelofs wrote: > > > IIUC, you don't want to cross compile llvm itself (which is what those > > > instructions are for), but instead you want to *use* llvm to cross compile > >

Hello Christian, I reran my script with a similar cmake command to yours. After the build finished the following command from the build directory gave me: find . -name \*builtins.a ./lib/clang/9.0.0/armv6m-none-eabi/lib/libclang_rt.builtins.a ./lib/clang/9.0.0/armv7m-none-eabi/lib/libclang_rt.builtins.a ./lib/clang/9.0.0/armv7em-none-eabi/lib/libclang_rt.builtins.a I hope you see something like

Hello Christian, I'd expect that adding the library paths (-L) from gcc -v should fix the unable to find -lc, -lm but it won't fix the -lclang_rt.builtins-armv6m.a . To get clang_rt.builtins-armv6m.a you will need to cross compile compiler-rt for v6m and copy it to /usr/local/myclang/lib/clang/8.0.0/lib/baremetal . Beware that building compiler-rt for v6m does need quite a bit of fighting

On Fri, Aug 04, 2017 at 04:40:44PM -0600, Jonathan Roelofs wrote: > Might be a helpful exercise for you to try building vanilla clang with > runtimes for the host, before worrying about how to build everything for > your baremetal case: > http://llvm.org/docs/GettingStarted.html#getting-started-quickly-a-summary So I did. :o) It was fun realizing how much Release type reduces LD

Hello again Christian, I've posted https://reviews.llvm.org/D55709 to see if we can get the documentation on how to cross-compile compiler-rt improved. I'll be out of office until next year so I may be a bit slow to respond to any follow ups. Peter On Thu, 13 Dec 2018 at 17:10, Peter Smith <peter.smith at linaro.org> wrote: > > Hello Christian, > > I've just

On Thu, Aug 03, 2017 at 08:22:24AM -0600, Jonathan Roelofs wrote: > IIUC, you don't want to cross compile llvm itself (which is what those > instructions are for), but instead you want to *use* llvm to cross compile > things. > > To build your sysroot, you'll need to cross-build: > > 1) A libc. Good choices for that for baremetal are: newlib or musl. > 2)

On Wed, Aug 02, 2017 at 05:48:20PM -0600, Jonathan Roelofs wrote: > I strongly recommend against using the host's headers when cross compiling. > You need to either find or build an arm-none-eabi sysroot, and use the > --sysroot= flag. > > > Jon OK, that's a start. I found https://www.llvm.org/docs/HowToCrossCompileLLVM.html. Is it enough for --sysroot? In case it is,

Dear LLVM developers, Hello, I'm trying to find a way of cross-compiling my c code against Baremetal Cortex-M device (so target triple will be arm-none-eabi) only using LLVM/Clang, and not using anything from GNU (ld or libc). I'm doing this to know which one of LLVM/clang and GCC produces smaller flash image size because saving flash is a big deal in our projects. 1) When I just follow

You may also take a look at the ELLCC project (www.ellcc.org <http://www.ellcc.org/>). As far as I understand it they produce and package cross toolchains for a number of popular targets. - Matthias > On Aug 4, 2017, at 12:54 PM, Jonathan Roelofs via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > > > On 8/4/17 1:14 PM, Goran Mekić via llvm-dev wrote: >> On

Hello Peter and Lists, thanks a lot, that way it worked out! The final cmake was cmake -G "Ninja" ../llvm/projects/compiler-rt/ -DCOMPILER_RT_BUILD_BUILTINS=ON -DCOMPILER_RT_BUILD_SANITIZERS=OFF -DCOMPILER_RT_BUILD_XRAY=OFF -DCOMPILER_RT_BUILD_LIBFUZZER=OFF -DCOMPILER_RT_BUILD_PROFILE=OFF -DCMAKE_C_COMPILER=/usr/local/myclang/bin/clang -DCMAKE_AR=/usr/local/myclang/bin/llvm-ar

Hello Christian, I've put some comments inline, On Sun, 3 Feb 2019 at 13:11, Christian Richter <christian.richter at hsu-hh.de> wrote: > > Hello again, > > so after I successfully build the compiler-rt for armv6 I tried to > actually use it in compiling a small helloworld for a baremetal arm > (consisting of barehelloCLANG.c and a small io.h + io.c) , but the >

Hi all, I think using code coverage on baremetal has come up once or twice on llvmdev, but I don't think anyone has actually written up how the workflow works, or what issues come up.  This description is based on work done together with my colleague Weiming Zhao. By "baremetal" here, I mean an embedded environment without an operating system.  We specifically used a ARM target

I think that this proposal would be very useful, and I will describe our experiences of trying to do this for our embedded bare-metal target. Recently we implemented support for just the '-fprofile-instr-generate' option and the 'compiler-rt/lib/profile' sources, and added the following to our LD scripts: /* Append the LLVM profiling sections */ . = ALIGN(4);

Hello again! Tried out the small Hello World Setup, worked as intended: root at christian-forschung-virtual-machine:/home/progs# clang -v --target=arm-linux-gnueabihf hello.c -o hello -fuse-ld=lld clang version 8.0.0 (https://git.llvm.org/git/clang.git/ a152c7a4b7ba8f4cb9532ead9a38a7121db43d50) (https://git.llvm.org/git/llvm.git/ 1959ce6f3e01241919968ac1911fd45660239d23) Target:

Hi all How do I discover the MAC address of machines that are available just with only BIOS installed (no Operating System present). And I need to find the mac address of such machines that are up with just BIOS. How do i do image installations on * bare-metal *? Please Guide me. Thanks. Saravanan Sundaramoorthy Red Hat Certified Engineer http://www.google.com/profiles/dearsaravanan#about

Hello, I'm assessing the work required to enable Safe Stack for a bare metal target. Looking at compiler-rt/lib/safestack/, the current implementation depends on thread support for mutex & storing unsafe stack pointer. It also need several system calls: gettid, tgkill, mmap, munmap, mprotect. Our target doesn't has all underlying support it needs. My question is: what's the

Hi, I followed two posts as my guideline http://lists.llvm.org/pipermail/llvm-dev/2017-September/117339.html and http://lists.llvm.org/pipermail/llvm-dev/2017-September/117156.html I am using clang 4.0.1 and compiler-rt 4.0 release 1. I made changes in the LCF to mimic Linux Platform (for linker magic) In data section i have added: __start___llvm_prf_cnts = .;