Hi Kewen, Thanks very much for your time and kind explanation! I am very sorry for making a big mistake yesterday. What I said work was actually following command: $ gcc -std=c11 -static-libasan test.c I forgot to add "-fsanitize=address", after adding "-fsanitize=address", it reported following error: $ gcc -std=c11 -fsanitize=address -static-libasan test.c gcc: fatal error: cannot read spec file 'libsanitizer.spec': No such file or directory compilation terminated. I installed gcc from Void Linux's official package. So it means this gcc doesn't support ASAN? But from "gcc -v" output, I can't see "--disable-libsanitizer". Thanks very much again for your time! Best Regards Nan Xiao On Fri, Dec 27, 2019 at 10:27 AM Kewen.Lin <linkw@xxxxxxxxxxxxx> wrote: > > Hi Nan, > > on 2019/12/26 下午6:16, Nan Xiao wrote: > > Hi Kewen, > > > > Thanks very much for your quick response! > > > > Yes, after adding "-static-libasan", the compilation is successful! > > > > Good to know that, but it's a bit weird that DSO way doesn't work. > I noticed that w/ and w/o -static-libasan both need object file libasan_preinit.o. > But the compilation w/o -static-libasan complains no file "libasan_preinit.o". > Could you append option "-v" to both compilation commands w/ and w/o -static-libasan, > and check the location which holds static libasan whether have the shared version? > > If your gcc was installed by packages instead of building from scratch by yourself, > is it possible due to that current env only installs static libasan but not shared. > Try to install the shared version libasan additionally if yes? > > Sorry, I can't mimic this symptom in local env exactly, just guess. HTH. > > BR, > Kewen > > > But I checked the output of "gcc -v", there is no "--disable-libsanitizer": > > > > $ gcc -v > > Using built-in specs. > > COLLECT_GCC=gcc > > COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/9.2.0/lto-wrapper > > Target: x86_64-unknown-linux-gnu > > Configured with: /builddir/gcc-9.2.0/configure > > --build=x86_64-unknown-linux-gnu --enable-fast-character > > --enable-vtable-verify --prefix=/usr --mandir=/usr/share/man > > --infodir=/usr/share/info --libexecdir=/usr/lib --libdir=/usr/lib > > --enable-threads=posix --enable-__cxa_atexit --disable-multilib > > --with-system-zlib --enable-shared --enable-lto --enable-plugins > > --enable-linker-build-id --disable-werror --disable-nls > > --enable-default-pie --enable-default-ssp --enable-checking=release > > --disable-libstdcxx-pch --with-isl --with-linker-hash-style=gnu > > --disable-libunwind-exceptions --disable-target-libiberty > > --enable-serial-configure > > --enable-languages=c,c++,objc,obj-c++,fortran,lto,go,ada > > Thread model: posix > > gcc version 9.2.0 (GCC) > > > > Thanks! > > > > Best Regards > > Nan Xiao > > > > On Thu, Dec 26, 2019 at 6:01 PM Kewen.Lin <linkw@xxxxxxxxxxxxx> wrote: > >> > >> Hi Nan, > >> > >> on 2019/12/26 下午4:48, Nan Xiao wrote: > >>> Hi gcc community, > >>> > >>> Greetings from me! > >>> > >>> I am using Void Linux, and want to use sanitizers. Using clang to > >>> compile code, it is OK: > >>> > >>> $ clang -std=c11 -fsanitize=address test.c > >>> $ > >>> > >>> While gcc reports following errors: > >>> > >>> $ gcc -std=c11 -fsanitize=address test.c > >>> /usr/bin/ld: cannot find libasan_preinit.o: No such file or directory > >>> /usr/bin/ld: cannot find -lasan > >>> collect2: error: ld returned 1 exit status > >>> > >> > >> May I suggest you checking your gcc whether disabled libsanitizer support? > >> GCC configuration allows you to build one gcc without libsanitizer support > >> with --disable-libsanitizer. "gcc -v" can show the configuration options. > >> > >> > >>> I check the program compiled with clang: > >>> > >>> $ ldd a.out > >>> linux-vdso.so.1 (0x00007fffd858a000) > >>> libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007fc1659b8000) > >>> librt.so.1 => /usr/lib/librt.so.1 (0x00007fc1659ad000) > >>> libm.so.6 => /usr/lib/libm.so.6 (0x00007fc165868000) > >>> libdl.so.2 => /usr/lib/libdl.so.2 (0x00007fc165863000) > >>> libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fc165849000) > >>> libc.so.6 => /usr/lib/libc.so.6 (0x00007fc165686000) > >>> /lib64/ld-linux-x86-64.so.2 => /lib/ld-linux-x86-64.so.2 (0x00007fc1659e0000) > >>> > >> > >> See https://github.com/google/sanitizers/wiki/AddressSanitizerAsDso > >> I guess your clang was configured as static asan library by default. > >> So it's linked with static library, you can't find libasan.so with ldd. > >> > >>> No asan library is required. > >>> > >> > >> It requires static library. By the way, for gcc you can link with static library > >> via gcc option -static-libasan. > >> > >> > >> BR, > >> Kewen > >> >
