similar to: [LLVMdev] Customize Standard C Library Using LLVM (to support llvm backend optimization)

> > FWIW, I build baremetal newlib for arm-eabi using clang, and it works. I >> had to patch a few of the __attribute__((naked)) functions because they >> were using pre-UAL asm syntax, but for the most part it "just works". >> > I build the baremetal newlib using arm-none-eabi-gcc as well, but after linking with the hello world program, it failed to run on

>> I'm used to build GCC (4.x) toolchains with newlib, but how can I do >> the same with llvm-gcc ? > Pretty much same way as with gcc. E.g. via --with-newlib, etc. I successfully built llvm+clang, but it seems that the newlib library files have neither been compiled nor installed. With GCC (at the time 4.5.2), the build steps are straightforward: newlib/ and libgloss/

# HG changeset patch # User Olaf Hering <olaf@aepfle.de> # Date 1341839122 -7200 # Node ID 2dd50c201ca0d3542f3589942ae9e51d33ec7509 # Parent 42f76d536b116d2ebad1b6705ae51ecd171d2581 stubdom: fix errors in newlib rpmlint found a few code bugs in newlib, and marks them as errors after rpm build. Add another newlib patch and apply it during stubdom build. I: A function uses a

> Virtually all. As far as I could test, all major architectures > (v4/v5/v6 + v7-A-R-M), although I'm still fighting with some Thumb > code generation. Not a big issue for me: targets are ARMv4 (ARM7) and ARMv5 (ARM9) "classic" CPUs - in ARM terminology. No cortex. > I haven't tested dragonegg, but clang and llvm-gcc do the job. > llvm-gcc seems to be more in

Hi Pertti, On Thu, 2006-11-09 at 18:41 +0200, Pertti Kellomäki wrote: > Hi Reid, > > I'll write a separate post about the intrinsics, but just > a quick note about the CFLAGS issue. Okay. > > Reid Spencer kirjoitti: > > On Thu, 2006-11-09 at 15:29 +0200, Pertti Kellomäki wrote: > >> Another related thing is that even when I defined -emit-llvm in >

Reid Spencer kirjoitti: > So, now I'm not sure what you're talking about. Is > libgloss part of newlib? If so, please note that it is not llvm-gcc's > job to pass CFLAGS down. That would be a bug in the newlib makefiles. :) Sorry for being obtuse. Yes, if there indeed is a bug, it is in the newlib build system. I was trying to compile newlib with llvm-gcc. The need for

Hi Reid, I'll write a separate post about the intrinsics, but just a quick note about the CFLAGS issue. Reid Spencer kirjoitti: > On Thu, 2006-11-09 at 15:29 +0200, Pertti Kellomäki wrote: >> Another related thing is that even when I defined -emit-llvm in >> what I thought would be a global CFLAGS for all of newlib, it did >> not get propagated to all subdirectories.

I managed to compile newlib with llvm-gcc yesterday. That is, the machine independent part is now basically done, and the syscall part contains no-op stubs provided by libgloss. I haven't tested the port yet, but since newlib has already been ported to many architectures, I would be pretty surprised if there were any major problems. A couple of things I noticed when configuring newlib for

Does this install -d -m0755 -p "/mnt/gen2/TmpDir/portage/app-emulation/xen-pvgrub-4.3.0/image//usr/lib/xen/boot" install -m0644 -p mini-os-x86_32-grub/mini-os.gz "/mnt/gen2/TmpDir/portage/app-emulation/xen-pvgrub-4.3.0/image//usr/lib/xen/boot/pv-grub-x86_32.gz" make: Leaving directory `/mnt/gen2/TmpDir/portage/app-emulation/xen-pvgrub-4.3.0/work/xen-4.3.0/stubdom'

Hi, I am trying to optimize some benchmarks using LLVM and run them on gem5 simulator (build for ARM). I am using Sourcery Codebench cross-compiler for ARM on my x-86 machine. My steps up till now have been using the following commands. 1. clang -static -emit-llvm -march=armv7-a -mfloat-abi=soft -target arm-elf a.cpp -c -integrated-as \

Hello, Emmanuel > I'm used to build GCC (4.x) toolchains with newlib, but how can I do > the same with llvm-gcc ? Pretty much same way as with gcc. E.g. via --with-newlib, etc. > It seems that clang attemps to find the header files from the host > system dir, not from the target system dir, so I guess that I missed > an important option ... somewhere. clang is not pretty well

I have been browsing through the newlib documentation at <http://sources.redhat.com/newlib/> and pondering about how newlib relates to LLVM. Comments welcome, again. As I see it, there are basically two parts of libc that need to be considered. Much of libc is stuff like atoi(), isalpha(), etc. which are just convenience routines written in ANSI C. For these, it should be sufficient to

Hi Pertti, On Thu, 2006-11-09 at 15:29 +0200, Pertti Kellomäki wrote: > I managed to compile newlib with llvm-gcc yesterday. That > is, the machine independent part is now basically done, and > the syscall part contains no-op stubs provided by libgloss. > I haven't tested the port yet, but since newlib has already > been ported to many architectures, I would be pretty surprised

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)

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 Thu, Mar 12, 2009 at 8:39 PM, Sandeep Patel <deeppatel1987 at gmail.com>wrote: > Attached is the patch I've been building arm-eabi with, which might > help with linux-gnueabi. I disable multilib to get around several bugs > with thumb. I build cross binutils first, then llvm, then llvm-gcc > with newlib merged in. > > The following bugs need to be addressed for

Hello LLVM Community (specifically anyone working with ARM Cortex-M), While trying to compile the Newlib C library I found that Clang10 was generating slightly larger binaries than the libc from the prebuilt gcc-arm-none-eabi toolchain. I looked at a few specific functions (memcpy, strcpy, etc.) and noticed that LLVM does not tend to generate load/store instructions with a register offset (e.g.

Hello, I recognized that compiler-rt's the implementation of __aeabi_memcpy simply branches to memcpy. The implementation of memcpy is not provided. So an externally provided memcpy () has to be used. (also applies to memmove, memset, memclr) On ARM I have seen implementations of memcpy () using floating-point registers (if compiled with NEON support). The is perfectly legal, as memcpy ()

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

On Fri, 7 Sep 2018 at 17:48, Tim Northover <t.p.northover at gmail.com> wrote: > I looked at your diffs and you've only changed one of the functions to > return SDValue(), you need to change lowerFP_TO_SINT itself too. The > one with the store is just there as an optimization; if it doesn't > trigger (because of your diff) then lowerFP_TO_SINT will still create > a