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digitalmars.D.ldc - build runtime for embedded Linux (cross)

reply Dmitry Ponyatov <dponyatov gmail.com> writes:
What's can be wrong with `i686-linux-musl` cross target for 
`ldc-build-runtime` ?

```sh
ponyatov debian:~/player$ rm -rf tmp/ldc_i686-linux-musl ; 
CORES=1 make ldc
```
```
PATH=/home/ponyatov/player/host/bin:/opt/ldc2-1.32.0-linux-x86_64/bin:/home/ponyatov/.cargo/bin:/home/ponyatov/.npm/bin:/home/ponyatov/.opam/default/bin:/home/ponyatov/.nimble/bin:/home/ponyatov/Arduino/arduino-ide_2.2.1_Linux_64bit/resources/app/lib/backend/resources:/home/ponyatov/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin:/home/ponyatov/Arduino/arduino-ide_2.2.1_Linux_64bit:/usr/lib/jvm/java-11-openjdk-amd64/bin:/home/ponyatov/.cache/rebar3/bin:/home/ponyatov/bin:/home/ponyatov/.local/bin:/usr/local/bin:/usr
bin:/bin:/usr/games CC=i686-linux-musl-gcc CXX=i686-linux-musl-g++
/opt/ldc2-1.32.0-linux-x86_64/bin/ldc-build-runtime -j1 --ldc
/opt/ldc2-1.32.0-linux-x86_64/bin/ldc2  \
         --buildDir /home/ponyatov/player/tmp/ldc_i686-linux-musl 
--ldcSrcDir /home/ponyatov/player/tmp/ldc-1.32.0-src \
         --targetSystem i686-linux-musl BUILD_SHARED_LIBS=ON \
         --dFlags="-mtriple=i686-linux-musl;-mcpu=i686"
```
```
.: Creating build directory: 
/home/ponyatov/player/tmp/ldc_i686-linux-musl
.: Invoking: cmake 
-DLDC_EXE_FULL=/opt/ldc2-1.32.0-linux-x86_64/bin/ldc2 
-DDMDFE_MINOR_VERSION=102 -DDMDFE_PATCH_VERSION=2 
-DTARGET_SYSTEM=i686-linux-musl 
'-DD_EXTRA_FLAGS=-mtriple=i686-linux-musl;-mcpu=i686' 
-DBUILD_SHARED_LIBS=ON 
/home/ponyatov/player/tmp/ldc-1.32.0-src/runtime
-- The C compiler identification is GNU 12.3.0
-- Check for working C compiler: 
/home/ponyatov/player/host/bin/i686-linux-musl-gcc
-- Check for working C compiler: 
/home/ponyatov/player/host/bin/i686-linux-musl-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
```
```
CMake Error at CMakeLists.txt:111 (message):
   Shared libraries (BUILD_SHARED_LIBS) are only supported on 
Windows, Linux,
   macOS, FreeBSD and DragonFly for the time being.
```
Oct 27 2023
parent reply Dmitry Ponyatov <dponyatov gmail.com> writes:
   Shared libraries (BUILD_SHARED_LIBS) are only supported on 
 Windows, Linux,


fixed with

```
	--targetSystem='Linux;UNIX' CMAKE_SYSTEM_NAME=Linux 
BUILD_SHARED_LIBS=ON   \
```

Now have some problems with right `ldc2.conf`:

```Makefile
.PHONY: hello
hello: $(ROOT)/bin/hello
$(ROOT)/bin/hello: hello/hello.d ldc2.conf
	$(XPATH) ldc2 -mtriple $(TARGET) -of=$  $< && file $ 
```
project-local: `~/player/ldc2.conf`
```
"i686-.+-linux-musl":
{
     switches = [
         "-mcpu=i686",
         "-I%%ldcbinarypath%%/../import",
         "-gcc=i686-linux-musl-gcc"
     ];
     lib-dirs = [
         "/home/ponyatov/player/root/lib"
     ];
}
```
```
ldc2 -mtriple i686-linux-musl 
-of=/home/ponyatov/player/root/bin/hello hello/hello.d && file 
/home/ponyatov/player/root/bin/hello
```
```
/home/ponyatov/player/host/lib/gcc/i686-linux-musl/12.3.0/../../../../i68
-linux-musl/bin/ld: cannot find -lunwind: No such file or directory
collect2: error: ld returned 1 exit status
```
```sh
ponyatov debian:~/player$ ls root/lib/
```
```
crt1.o             libcrypt.a                             
libdruntime-ldc-shared.so           
libphobos2-ldc-debug-shared.so.102.2  librt.a
crti.o             libc.so                                
libdruntime-ldc-shared.so.102       libphobos2-ldc-shared.so      
         libutil.a
crtn.o             libdl.a                                
libdruntime-ldc-shared.so.102.2     libphobos2-ldc-shared.so.102  
         libxnet.a
ldc_rt.dso.o       libdruntime-ldc-debug-shared.so        libm.a  
                             libphobos2-ldc-shared.so.102.2        
modules
ld-musl-i386.so.1  libdruntime-ldc-debug-shared.so.102    
libphobos2-ldc-debug-shared.so      libpthread.a                  
         rcrt1.o
libc.a             libdruntime-ldc-debug-shared.so.102.2  
libphobos2-ldc-debug-shared.so.102  libresolv.a                   
         Scrt1.o
```
Oct 27 2023
parent kinke <noone nowhere.com> writes:
On Friday, 27 October 2023 at 17:14:07 UTC, Dmitry Ponyatov wrote:

 Now have some problems with right `ldc2.conf`:
 [...]
 /home/ponyatov/player/host/lib/gcc/i686-linux-musl/12.3.0/../../../../i68
-linux-musl/bin/ld: cannot find -lunwind: No such file or directory


The .conf seems fine. On musl, druntime depends on libunwind 
(`-lunwind` is injected by LDC). There's a package for Alpine, 
incl. a link to the project home page to build it yourself: 
https://pkgs.alpinelinux.org/package/edge/main/x86/libunwind
Oct 28 2023