Greetings, The code that Go compilers emit is closely tied to the Go runtime-- any compiled Go code (including *.ll files) will have references to symbols that it needs from the runtime. When you try to convert your LLVM-produced bitcode into a binary via
clang helloworld.ll -o helloworldLLVM you're effectively not including definitions of any of those key runtime routines (for example, "runtime.newobject", which is one of the functions that supports memory allocation). It would be similar to what might happen if you took a C++ "hi mom" program, compiled it down to an object file using "clang++", then tried to link the resulting object into a binary using "gcc". Hope this helps-- Than On Thu, Dec 16, 2021 at 1:07 PM Danilo bestbug < bestbug.corporat...@gmail.com> wrote: > Hello, > > I've create a docker images with ubuntu 20.10 with GOLLVM, I'm using at > the moment a simple test repository > <https://github.com/bestbug456/gollvmRepository>, I was able to create > the ll file with the following command: > > go build -gccgoflags -static-libgo -x -work 1> transcript.txt 2>&1 > WORK=$(egrep -m 1 '(WORK=|llvm-goc -c)' transcript.txt | awk '{ print > substr ($0, 6 ) }') > > /gollvm/install/bin/llvm-goc -c -O2 -g -m64 > -fdebug-prefix-map=$WORK=/tmp/go-build \ > -gno-record-gcc-switches -fgo-pkgpath=$PWD \ > -fgo-relative-import-path=$PWD -o $WORK/b001/_go_.o \ > -I $WORK/b001/_importcfgroot_ -o $LLFILE -S -emit-llvm $MAINFILE > > But when I try to convert to binary via clang the file I've some error: > clang helloworld.ll -o helloworldLLVM > warning: overriding the module target triple with x86_64-pc-linux-gnu > [-Woverride-module] > 1 warning generated. > /usr/bin/ld: > /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o: > in function `_start': > (.text+0x24): undefined reference to `main' > /usr/bin/ld: /tmp/helloworld-bcb8cc.o: in function > `_..z2fopt..z2fvmsdk..z2fhelloworld.describe': > /opt/vmsdk/helloworld/./describe.go:6: undefined reference to > `runtime.newobject' > /usr/bin/ld: /opt/vmsdk/helloworld/./describe.go:6: undefined reference to > `runtime.writeBarrier' > /usr/bin/ld: /opt/vmsdk/helloworld/./describe.go:6: undefined reference to > `fmt.Printf' > /usr/bin/ld: /opt/vmsdk/helloworld/./describe.go:6: undefined reference to > `runtime.typedmemmove' > /usr/bin/ld: /tmp/helloworld-bcb8cc.o:(.rodata.string..d[string..d]+0x18): > undefined reference to `runtime.strequal..f' > /usr/bin/ld: > /tmp/helloworld-bcb8cc.o:(.rodata.type...1string[type...1string]+0x18): > undefined reference to `runtime.memequal64..f' > clang: error: linker command failed with exit code 1 (use -v to see > invocation) > > > I'm this is the first time I use this buildchain and I don't understand > what I'm doing wrong. Can someone help me? > Those are the commit I've used for build gollvm, if needed > > llvm-project: 43ff75f2c3feef64f9d73328230d34dac8832a91 > llvm-project/llvm/tools/gollvm: 44a7a475cfd3b871b7a5a0941b8ab1ea9d489adc > llvm-project/llvm/tools/gollvm/gofrontend: > be0d2cc2df9f98d967c242594838f86362dae2e7 > llvm-project/llvm/tools/gollvm/libgo/libffi: > 737d4faa00d681b4c758057f67e1a02d813d01c2 > llvm-project/llvm/tools/gollvm/libgo/libbacktrace: > 5a99ff7fed66b8ea8f09c9805c138524a7035ece > > Thanks in advance! > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/d503d8bf-e904-42be-9955-6813d4f8c29fn%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/d503d8bf-e904-42be-9955-6813d4f8c29fn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CA%2BUr55EkHmiMhUXTWqWNY0bQOTzV6fkte-T5XieSWeQxnKJKsg%40mail.gmail.com.
