[cfe-users] ASAN with MinGW

[Michael Hartmann via cfe-users]

Dear LLVM community,

I am looking for a free C/C++ compiler for Windows including support for 
sanitizers. For that I want to use clang in a MinGW environment. I am 
using winlibs (http://winlibs.com) which comes with clang 10. Compiling 
works like a charm but when I try to use for example the address 
sanitizes (ASAN) I get the error message:

 > clang -Wall -fsanitize=address test.c
ld: cannot find 
[...]\mingw64\lib\clang\10.0.0\lib\windows\libclang_rt.asan_dynamic-x86_64.dll.a: 
No such file or directory
ld: cannot find 
[...]\mingw64\lib\clang\10.0.0\lib\windows\libclang_rt.asan_dynamic_runtime_thunk-x86_64.a: 
No such file or directory
ld: cannot find 
[...]\mingw64\lib\clang\10.0.0\lib\windows\libclang_rt.asan_dynamic_runtime_thunk-x86_64.a: 
No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)

If I am not mistaken, the shared and static libraries for the ASAN run 
time enviorment are missing. Indeed, I checked that the files 
libclang_rt.asan_dynamic-x86_64.dll.a and 
libclang_rt.asan_dynamic_runtime_thunk-x86_64.a do not exist in the 
MinGW distribution that I am using.

I also tried to compile the runtime myself. I checked out the llvm repo 
and tried to compile the targets in rt-build. However, I
get the following error message:

 > ninja
[8/15] Linking CXX shared library 
lib\windows\libclang_rt.asan_dynamic-x86_64.dll
FAILED: lib/windows/libclang_rt.asan_dynamic-x86_64.dll 
lib/windows/libclang_rt.asan_dynamic-x86_64.dll.a
cmd.exe /C "cd . && [...]\mingw64\bin\clang++.exe  -Wall -std=c++14 
-Wno-unused-parameter  -m64 -nodefaultlibs -shared -o 
lib\windows\libclang_rt.asan_dynamic-x86_64.dll 
-Wl,--out-implib,lib\windows\libclang_rt.asan_dynamic-x86_64.dll.a 
-Wl,--major-image-version,0,--minor-image-version,0 
@CMakeFiles\clang_rt.asan-dynamic-x86_64.rsp  && cd ."
Warning: .drectve 
`/alternatename:__sanitizer_report_error_summary=__sanitizer_report_error_summary__def 
/export:__sanitizer_report_error_summary__dll=__sanitizer_report_error_summary 
' unrecognized
Warning: corrupt .drectve at end of def file
Warning: corrupt .drectve at end of def file
Warning: corrupt .drectve at end of def file
Warning: corrupt .drectve at end of def file
Warning: .drectve 
`/alternatename:__sanitizer_cov_trace_pc_guard=__sanitizer_cov_trace_pc_guard__def 
/export:__sanitizer_cov_trace_pc_guard__dll=__sanitizer_cov_trace_pc_guard 
/alternatename:__sanitizer_cov_trace_pc_guard_init=__sanitizer_cov_trace_pc_guard_init__def 
/export:__sanitizer_cov_trace_pc_guard_init__dll=__sanitizer_cov_trace_pc_guard_init 
/alternatename:__sanitizer_cov_trace_cmp=__sanitizer_cov_trace_cmp__def 
/export:__sanitizer_cov_trace_cmp__dll=__sanitizer_cov_trace_cmp 
/alternatename:__sanitizer_cov_trace_cmp1=__sanitizer_cov_trace_cmp1__def 
/export:__sanitizer_cov_trace_cmp1__dll=__sanitizer_cov_trace_cmp1 
/alternatename:__sanitizer_cov_trace_cmp2=__sanitizer_cov_trace_cmp2__def 
/export:__sanitizer_cov_trace_cmp2__dll=__sanitizer_cov_trace_cmp2 
/alternatename:__sanitizer_cov_trace_cmp4=__sanitizer_cov_trace_cmp4__def 
/export:__sanitizer_cov_trace_cmp4__dll=__sanitizer_cov_trace_cmp4 
/alternatename:__sanitizer_cov_trace_cmp8=__sanitizer_cov_trace_cmp8__def 
/export:__sanitizer_cov_trace_cmp8__dll=__sanitizer_cov_trace_cmp8 
/alternatename:__sanitizer_cov_trace_const_cmp1=__sanitizer_cov_trace_const_cmp1__def 
/export:__sanitizer_cov_trace_const_cmp1__dll=__sanitizer_cov_trace_const_cmp1 
/alternatename:__sanitizer_cov_trace_const_cmp2=__sanitizer_cov_trace_const_cmp2__def 
/export:__sanitizer_cov_trace_const_cmp2__dll=__sanitizer_cov_trace_const_cmp2 
/alternatename:__sanitizer_cov_trace_const_cmp4=__sanitizer_cov_trace_const_cmp4__def 
/export:__sanitizer_cov_trace_const_cmp4__dll=__sanitizer_cov_trace_const_cmp4 
/alternatename:__sanitizer_cov_trace_const_cmp8=__sanitizer_cov_trace_const_cmp8__def 
/export:__sanitizer_cov_trace_const_cmp8__dll=__sanitizer_cov_trace_const_cmp8 
/alternatename:__sanitizer_cov_trace_switch=__sanitizer_cov_trace_switch__def 
/export:__sanitizer_cov_trace_switch__dll=__sanitizer_cov_trace_switch 
/alternatename:__sanitizer_cov_trace_div4=__sanitizer_cov_trace_div4__def 
/export:__sanitizer_cov_trace_div4__dll=__sanitizer_cov_trace_div4 
/alternatename:__sanitizer_cov_trace_div8=__sanitizer_cov_trace_div8__def 
/export:__sanitizer_cov_trace_div8__dll=__sanitizer_cov_trace_div8 
/alternatename:__sanitizer_cov_trace_gep=__sanitizer_cov_trace_gep__def 
/export:__sanitizer_cov_trace_gep__dll=__sanitizer_cov_trace_gep 
/alternatename:__sanitizer_cov_trace_pc_indir=__sanitizer_cov_trace_pc_indir__def 
/export:__sanitizer_cov_trace_pc_indir__dll=__sanitizer_cov_trace_pc_indir 
/alternatename:__sanitizer_cov_8bit_counters_init=__sanitizer_cov_8bit_counters_init__def 
/export:__sanitizer_cov_8bit_counters_init__dll=__sanitizer_cov_8bit_counters_init 
/alternatename:__sanitizer_cov_pcs_init=__sanitizer_cov_pcs_init__def 
/export:__sanitizer_cov_pcs_init__dll=__sanitizer_cov_pcs_init ' 
unrecognized
Warning: corrupt .drectve at end of def file
Warning: corrupt .drectve at end of def file
Warning: .drectve 
`/alternatename:__ubsan_handle_cfi_bad_type=__ubsan_handle_cfi_bad_type_default 
' unrecognized
Warning: .drectve 
`/alternatename:__sanitizer_malloc_hook=__sanitizer_malloc_hook__def 
/export:__sanitizer_malloc_hook__dll=__sanitizer_malloc_hook 
/alternatename:__sanitizer_free_hook=__sanitizer_free_hook__def 
/export:__sanitizer_free_hook__dll=__sanitizer_free_hook ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: corrupt .drectve at end of def file
Warning: .drectve 
`/alternatename:__sanitizer_weak_hook_strcmp=__sanitizer_weak_hook_strcmp__def 
/export:__sanitizer_weak_hook_strcmp__dll=__sanitizer_weak_hook_strcmp 
/alternatename:__sanitizer_weak_hook_strncmp=__sanitizer_weak_hook_strncmp__def 
/export:__sanitizer_weak_hook_strncmp__dll=__sanitizer_weak_hook_strncmp 
/alternatename:__sanitizer_weak_hook_strstr=__sanitizer_weak_hook_strstr__def 
/export:__sanitizer_weak_hook_strstr__dll=__sanitizer_weak_hook_strstr 
/alternatename:__sanitizer_weak_hook_memcmp=__sanitizer_weak_hook_memcmp__def 
/export:__sanitizer_weak_hook_memcmp__dll=__sanitizer_weak_hook_memcmp ' 
unrecognized
Warning: .drectve `/alternatename:__asan_on_error=__asan_on_error__def 
/export:__asan_on_error__dll=__asan_on_error ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `/include:__asan_dso_reg_hook ' unrecognized
[..]\mingw64\bin\ld: 
lib/sanitizer_common/CMakeFiles/RTSanitizerCommon.x86_64.dir/sanitizer_common.cpp.obj:[...]\compiler-rt\build/../lib/sanitizer_common/sanitizer_common.cpp:93: 
undefined reference to `__sanitizer_report_error_summary'
[..]\mingw64\bin\ld: 
lib/sanitizer_common/CMakeFiles/RTSanitizerCommon.x86_64.dir/sanitizer_printf.cpp.obj:[...]\compiler-rt\build/../lib/sanitizer_common/sanitizer_printf.cpp:240: 
undefined reference to `__sanitizer_on_print'

The problem seems to be caused by weak references which are used by 
ASAN. In particular, it seems that the compiler directive /alternatename 
is not available. I guess that this option might be available with the 
Visual Studio compatible frontend of clang.

I also extensively searched the web but only found outdated information. 
Can anyone tell me how I can get ASAN (and hopefully other sanitizers) 
working in a MinGW enviroment?

Thank you very much and kind regards,

--Michael