similar to: [LLVMdev] Using Compiler-RT with Clang on ARM

Hi, I'm trying to link my objs with compiler-rt built runtime lib for arm. According to the compiler-rt doc, it should be able to replace libgcc. However, if I replace "-lgcc" with "compiler-rt.a" for a static linking, gcc linker complains about undefined functions. Using "nm -g", I compared the functions in libgcc and compiler-rt.full-arm.a and found there are

On 22 October 2014 19:24, Jonathan Roelofs <jonathan at codesourcery.com> wrote: > I do compiler_rt + libc++abi + libc++ + clang (with a custom ToolChain) testing > of libc++ on bare-metal ARM.... so it is possible. Perhaps you mean to say that > it's not possible to test libunwind on arm-linux when using compiler_rt? Yeah, it's hard and clumsy, not impossible. Basically,

On Nov 15, 2012, at 9:33 PM, liangh at codeaurora.org wrote: > I'm trying to link my objs with compiler-rt built runtime lib for arm. > According to the compiler-rt doc, it should be able to replace libgcc. > However, if I replace "-lgcc" with "compiler-rt.a" for a static linking, > gcc linker complains about undefined functions. Using "nm -g", I

Hi Marshal, ARM has recently moved the buildslave from single test to with/without exception: http://lab.llvm.org:8011/builders/libcxx-libcxxabi-libunwind-arm-linux http://lab.llvm.org:8011/builders/libcxx-libcxxabi-libunwind-arm-linux-noexceptions but both slaves have the same error that wasn't there before: ******************** TEST 'libc++ ::

So, I remember we discussed this earlier this year, but I can't find the thread. The idea is to move libunwind into compiler-rt for the simple reasons below: 1. Unwinding is not exclusive to C++, nor exception handling. 2. Clang still includes libgcc_s and libgcc_eh when using compiler-rt (maybe eh isn't needed, but it was there for libgcc). 3. Testing the libunwind with libc++ on ARM is

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

Hi Peter I guess this is the document written by you https://fosdem.org/2018/schedule/event/crosscompile/attachments/slides/2107/export/events/attachments/crosscompile/slides/2107/How_to_cross_compile_with_LLVM_based_tools.pdf I follow it to try to use the clang to do cross compilation. Actually, my target binaries is SPECCPU2006 and autotools based binaries. However, I failed on the first

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

Ignore the suggested fix in my earlier post. How about this? diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 20c81c3..b8ebf42 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -1632,10 +1632,11 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM, if (!Subtarget.is64Bit()) { // These

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 >

LLVM appears to support Library functions for ISD::SRA ,ISD::SHL, and ISD::SRL, as they are properly defined in RuntimeLibCalls.def. The library functions defined in RuntimeLibCalls.def (among others) are these: HANDLE_LIBCALL(SRA_I16, "__ashrhi3") HANDLE_LIBCALL(SRA_I32, "__ashrsi3") HANDLE_LIBCALL(SRA_I64, "__ashrdi3") However, setting

If I do T.getArch() == xxx TLI.setUnavailable(LibFunc::copysign) then this works at generating a call instead of not being able to select the ISD::FCOPYSIGN, but I don't know why I don't need to do this for other LibFunc functions (such as floor, etc... these generate call just fine)? Thanks, Ryan On Tue, Jun 14, 2016 at 11:58 AM, Ryan Taylor <ryta1203 at gmail.com> wrote:

Tim, Are you referring to setLibcallName? That is target specific yes but there isn't RTLIB for most of the libm functions, for example, for acos this doesn't apply. Ideally what I would like is to create a libc with functions like acos called something like __xxx_acos that can still be recognized to be optimized. RTLIB is pretty limited but it works fine, I can just use

I'm using Clang, with arm-none-linux-gnueabi-g++ as a linker. Although compiler-rt replaced libgcc, we still need other libs such as libc, libm, etc. It seems libc is calling these missing functions. > > On Nov 15, 2012, at 9:33 PM, liangh at codeaurora.org wrote: >> I'm trying to link my objs with compiler-rt built runtime lib for arm. >> According to the compiler-rt

Hi guys, Thanks for all the info. Then, if, besides compiler-rt, I also need some other libs, such as libm, how do I link? Here is an example of missing functions in compiler-rt when linking: "-lstdc++ -lm --start-group -lcompiler-rt-armv7 -lgcc_eh -lc --end-group" vs. "-lstdc++ -lm --start-group -lgcc -lgcc_eh -lc --end-group" ...

On Tue, Jun 7, 2016 at 1:57 PM, Ryan Taylor <ryta1203 at gmail.com> wrote: > Tim, > > Currently, I have to do multiple things: > > 1) create some setLibcallNames in XXXISelLowering.cpp to generate correct > naming for RTLIBS. > 2) lower ISD down to an RTLIB for some calls (and then do solution 1 on > those to get correct names) These solve a related but different -

Note: Question is written after describing what I have coded. Hello LLVMDevs, I am trying to impliment floating point comparsion for an architecture which supports following type of floating point comparision if FPU is available: fcmp.un --> true if one of the operand is NaN fcmp.lt --> ordered less than, if any input NaN then return false fcmp.eq --> ordered equal, if any input NaN

Adding to Ashutosh's comments, We are also interested in making LLVM generate vector math library calls that are available with glibc (version > 2.22). reference: https://sourceware.org/glibc/wiki/libmvec Using the example case given in the reference, we found there are 2 vector versions for "sin" (4 X double) with same VF namely _ZGVcN4v_sin (avx) version and _ZGVdN4v_sin

Hello It seems you misses several points here... > So, you mean I should compile libc with clang and link with compiler-rt too? > But how can we expect a user of compiler-rt have a libc compiled in this > way? It's a part of gcc's src code... No it is not > If compiler-rt is a complete lib, it should also cover these functions, right? Yes and no. Yes - it should cover all

On Sat, 3 Jun 2017 16:04:57 -0700 Tim Northover <t.p.northover at gmail.com> wrote: [snip] > I think you should be able to fix it by changing the > compiler-rt/lib/xray/test/CMakeLists.txt. If you find the > "add_compiler_rt_test" call and move "-lstdc++" to the end, just after > "-lrt" it should work. Thanks, Tim. I don't see "-lrt":