I want to enable asan on my main executable and a shared library that I build locally.

main linker flag I think relavent to the sanitizer is

-fuse-ld=lld -static-libstdc++ -static-libsan -fsanitize=address. 

I put them on both the linker and compiler which is clang++

now when i run by execuatable, i got the message saying:

myExecutable: symbol lookup error: SDL2.so undefined symbol: __asan_init

it sounds like that the executable is looking for __asan_init in SDL2.so, which i do not understand why since it should have the same static-libasan and -fsanitize=address flag itself.

dumping the symbol from SDL2.so

i could see

00000025b7c0  000500000007 R_X86_64_JUMP_SLO 0000000000000000 __asan_init + 0
00000025b7c8  000600000007 R_X86_64_JUMP_SLO 0000000000000000 __asan_version_mi[...] + 0
00000025b9e8  000700000007 R_X86_64_JUMP_SLO 0000000000000000 __asan_register_g[...] + 0
00000025b9f0  000800000007 R_X86_64_JUMP_SLO 0000000000000000 __asan_unregister[...] + 0
     5: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __asan_init
     6: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __asan_version_m[...]
     7: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __asan_register_[...]
     8: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __asan_unregiste[...]

they are undefined for some reason although i told compiler to link it statically and it didn’t complain at compile time, but only when i start to run it.

if i remove the sanitizer flags when compiling SDL2.so, the executable would run perfectly, but no instrumentation by sanitizer in the SDL2.so happen at all, which is expected.

I do not know whether sanitizer would work with building it statically into a shared lib.

does anyone has experience with this? Thanks!