how create a shared library?

[bioinfornatics]

1/ build project with pic

$ ldc2 -g -O3 -op -release -c -relocation-model=pic localization.d -of localization.o
localization.s-iWqEVS: Assembler messages:
localization.s-iWqEVS:105: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:107: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:108: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:129: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:131: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:132: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:147: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:149: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:150: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:168: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:170: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:171: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:452: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:454: Warning: stand-alone `data16' prefix
localization.s-iWqEVS:455: Warning: stand-alone `data16' prefix

They are some warning but no error (i do not know whet is the problem with)

2/ create a shared library

$ ld -o localization.so -L/lib64/ -llphobos2 -lm -lpthread -ldl -lrt -ldruntime-ldc localization.o  -soname=localization.s
ld: warning: cannot find entry symbol _start; defaulting to 0000000000403140
/usr/lib64/liblphobos2.so: undefined reference to `__data_start'
/usr/lib64/liblphobos2.so: undefined reference to `_Dmain'

In which lib are define these thing?

2/ create a static lib is easy

$ ar rcs localization.o localization.a

thanks

[bioinfornatics]

with gcc it works:

$ gcc  -Dlphobos2_EXPORTS -DDMDV2 -DIN_LLVM -D_DH -DOPAQUE_VTBLS -DPOSIX -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic  -fPIC -shared *.o -o liblocalization.so

with llvm-ld

llvm-ld -o localization.so -L/usr/lib64/ -llphobos2 -lm -ldl -lrt localization.o  -soname=localization.so

llvm-ar exist too never used

[bitraft]

Does this need druntime & rc lib building with PIC ?

[bioinfornatics]

you can try it is the better thing :-) .
What you want to do?

[bioinfornatics]

if is a lib you need use flag: -link-as-library

[bioinfornatics]

just for update this topic, for generate a shared lib with llvm-ld they are several step:
In first generate llvm bytecode with --output-bc flag

$ ldc2 --output-bc --output-o  -op -release -c -relocation-model=pic  -od=../build *.d

llvm bytecode finish with .bc and are in ../build directory

$ cd ../build

Merge llvm bytecode together in one

$ lvm-ld -link-as-library -o libDparser.bc -L/usr/local/lib64/ -L/usr/lib64 -ldruntime-ldc -llphobos2 -lm -ldl -lrt -soname=Dparser *.bc

run llc

$ llc -relocation-model=pic libDparser.bc

End the process by build shared lib

$ gcc -shared libDparser.s -o libDparser.so

[dnadlinger]

LDC now has a -shared flag.