https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82379
Bug ID: 82379 Summary: internal_sigreturn not defined in libasan.so or libubsan.so with -mx32 Product: gcc Version: 7.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: sanitizer Assignee: unassigned at gcc dot gnu.org Reporter: steven at uplinklabs dot net CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org, jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org Target Milestone: --- The symbol "internal_sigreturn" isn't defined when building for the x32 ABI on x86_64: $ cat test.c int main(){ return 0; } $ gcc -mx32 -fsanitize=address -o test test.c /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.1/../../../../libx32/libasan.so: undefined reference to `internal_sigreturn' collect2: error: ld returned 1 exit status $ gcc -mx32 -fsanitize=undefined -o test test.c /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.1/../../../../libx32/libubsan.so: undefined reference to `internal_sigreturn' collect2: error: ld returned 1 exit status $ gcc -v Using built-in specs. COLLECT_GCC=/usr/bin/gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/7.2.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /build/gcc-multilib/src/gcc/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://www.uplinklabs.net/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --disable-libssp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror --enable-__cxa_atexit --enable-checking=release --enable-clocale=gnu --enable-gnu-indirect-function --enable-gnu-unique-object --enable-initfini-array --enable-install-libiberty --enable-libmpx --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --with-isl --with-linker-hash-style=gnu --with-multilib-list=m32,m64,mx32 --with-system-zlib Thread model: posix gcc version 7.2.1 20170929 (GCC) My GCC was built from latest in gcc-7-branch yesterday. Defining something like this in my application does technically work, but really shouldn't be necessary: void (*internal_sigreturn)(void) = 0;