Sanitisers are disabled for macOS13+ (e.g. fsanitize=undefined can not be used)

[zhk1211]

g++-13 M_tree.cpp -o /Users/zhaohaikun/Desktop/code/M_tree -fsanitize=undefined

ld: library not found for -lubsan
collect2: error: ld returned 1 exit status

Mac 13.4

g++-13 -v
Using built-in specs.
COLLECT_GCC=g++-13
COLLECT_LTO_WRAPPER=/opt/homebrew/Cellar/gcc/13.1.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/lto-wrapper
Target: aarch64-apple-darwin22
Configured with: ../configure --prefix=/opt/homebrew/opt/gcc --libdir=/opt/homebrew/opt/gcc/lib/gcc/current --disable-nls --enable-checking=release --with-gcc-major-version-only --enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-13 --with-gmp=/opt/homebrew/opt/gmp --with-mpfr=/opt/homebrew/opt/mpfr --with-mpc=/opt/homebrew/opt/libmpc --with-isl=/opt/homebrew/opt/isl --with-zstd=/opt/homebrew/opt/zstd --with-pkgversion='Homebrew GCC 13.1.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues --with-system-zlib --build=aarch64-apple-darwin22 --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.1.0 (Homebrew GCC 13.1.0)

[iains]

Yes, this is an issue, but it is intentional:

From Ventura (macOS13) the APIs have changed for accessing some of the information that the sanitisers need. At present, we do not have support in GCC for accessing those APIs and have had to disable the sanitisers until a working solution can be found.