Avoid memset in ASan error message printing.

`-ftrivial-auto-var-init=pattern` emits `memset` to initialize variables,
but with half-way intercepted functions this is problematic.

Can also be switched off per function with `__declspec(no_init_all)`.



Program received signal SIGSEGV, Segmentation fault.
0x7a80f51f in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
87        COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, dst, v, size);
1: x/i $pc
=> 0x7a80f51f <__asan_wrap_memset(void*, int, __sanitizer::usize)+335>: push   %eax
(rr) bt 10
#0  0x7a80f51f in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
#1  0x7a80f44b in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
#2  0x7a80f44b in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
#3  0x7a80f44b in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
...
#9168 0x7a80f44b in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
#9169 0x7a80f44b in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
#9170 0x7a80f44b in __asan_wrap_memset (dst=0x121ed78, v=255, size=400) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:87
#9171 0x7a7db0c7 in __sanitizer::SharedPrintfCode (append_pid=false, format=0x7a82b160 <.refptr.___ImageBase+4> "%s: CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx) (tid=%u)\n", args=<optimized out>) at /home/bernhard/data/entwicklung/2025/llvm-mingw/2025-01-04/llvm-mingw/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_printf.cpp:308
#9172 0x0000000c in ?? ()


(rr) disassemble __sanitizer::SharedPrintfCode
Dump of assembler code for function _ZN11__sanitizerL16SharedPrintfCodeEbPKcPc:
   0x7a7db0a0 <+0>:     push   %ebp
   0x7a7db0a1 <+1>:     push   %ebx
   0x7a7db0a2 <+2>:     push   %edi
   0x7a7db0a3 <+3>:     push   %esi
   0x7a7db0a4 <+4>:     sub    $0x190,%esp
   0x7a7db0aa <+10>:    mov    %edx,%esi
   0x7a7db0ac <+12>:    mov    %ecx,%edi
   0x7a7db0ae <+14>:    mov    0x1a4(%esp),%ebp
   0x7a7db0b5 <+21>:    mov    %esp,%ebx
   0x7a7db0b7 <+23>:    push   $0x190
   0x7a7db0bc <+28>:    push   $0xff
   0x7a7db0c1 <+33>:    push   %ebx
=> 0x7a7db0c2 <+34>:    call   0x7a823bc6 <memset>
   0x7a7db0c7 <+39>:    add    $0xc,%esp
   0x7a7db0ca <+42>:    mov    %edi,%ecx
   0x7a7db0cc <+44>:    mov    %ebx,%edx
   0x7a7db0ce <+46>:    push   %ebp
   0x7a7db0cf <+47>:    push   %esi
   0x7a7db0d0 <+48>:    call   0x7a7db5c0 <_ZN11__sanitizerL24SharedPrintfCodeNoBufferEbPciPKcS0_>
   0x7a7db0d5 <+53>:    add    $0x198,%esp
   0x7a7db0db <+59>:    pop    %esi
   0x7a7db0dc <+60>:    pop    %edi
   0x7a7db0dd <+61>:    pop    %ebx
   0x7a7db0de <+62>:    pop    %ebp
   0x7a7db0df <+63>:    ret
End of assembler dump.


With the `no_init_all` ASan prints:
AddressSanitizer: CHECK failed: asan_suppressions.cpp:46 "((suppression_ctx)) != (0)" (0x0, 0x0) (tid=36)


Unfortunately it looks like this draws in almost all dlls ...

                    /* llvm-symbolizer.exe, avoid loading libclang_rt.asan_dynamic-i386.dll too early */
                    strstr(make->module, "msvcp140.dll") ||
                    strstr(make->module, "vcruntime140.dll") ||
                    strstr(make->module, "concrt140.dll") ||
                    strstr(make->module, "advapi32.dll") ||
                    strstr(make->module, "sechost.dll") ||
                    strstr(make->module, "gdi32.dll") ||
                    strstr(make->module, "oleaut32.dll") ||
                    strstr(make->module, "imm32.dll") ||
                    strstr(make->module, "rpcrt4.dll") ||
                    strstr(make->module, "combase.dll") ||
                    strstr(make->module, "ole32.dll") ||
                    strstr(make->module, "iphlpapi.dll") ||
                    strstr(make->module, "dnsapi.dll") ||
                    strstr(make->module, "netapi32.dll") ||
                    strstr(make->module, "nsi.dll") ||
                    strstr(make->module, "ws2_32.dll") ||

                    strstr(make->module, "winspool.drv") ||
                    strstr(make->module, "compstui.dll") ||
                    strstr(make->module, "comctl32.dll") ||
                    strstr(make->module, "comctl32.dll") ||

and more ... but it looked working with x86_64 ?

Author: bernhardu

compiler-rt/CMakeLists.txt

@@ -540,7 +540,7 @@ append_list_if(MINGW -fms-extensions SANITIZER_COMMON_CFLAGS)
 # sanitizers.
 # Disable PowerPC because of https://github.com/llvm/llvm-project/issues/84654.
 if(NOT "${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "powerpc")
-  append_list_if(COMPILER_RT_HAS_TRIVIAL_AUTO_INIT -ftrivial-auto-var-init=pattern SANITIZER_COMMON_CFLAGS)
+  #append_list_if(COMPILER_RT_HAS_TRIVIAL_AUTO_INIT -ftrivial-auto-var-init=pattern SANITIZER_COMMON_CFLAGS)
 endif()
 
 # Set common link flags.