[Bug sanitizer/98165] New: Use of the UB sanitizer links the the program with libstdc++

[bruno at clisp dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98165

            Bug ID: 98165
           Summary: Use of the UB sanitizer links the the program with
                    libstdc++
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bruno at clisp dot org
                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: ---

I would like to use the 'signed-integer-overflow' sanitizer (part of the
undefined behaviour sanitizer) for all my C programs, as a security measure.

However, doing so with GCC causes a link dependency towards libstdc++:

$ gcc -Wall -fsanitize=signed-integer-overflow foo.c
$ ldd ./a.out
        linux-vdso.so.1 (0x00007ffc73977000)
        libubsan.so.1 => /lib/x86_64-linux-gnu/libubsan.so.1
(0x00007fbec9aa0000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbec98b6000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fbec98b0000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007fbec988e000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6
(0x00007fbec96ad000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
(0x00007fbec9692000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fbeca42a000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fbec9541000)

I don't want this, because libstdc++ increases the startup time of programs
(from ca. 2 ms to ca. 7 ms).

This is with gcc 10.2.0. With clang 11.0.0, I don't have this problem:

$ clang -fsanitize=signed-integer-overflow foo.c
$ ldd ./a.out 
        linux-vdso.so.1 =>  (0x00007fffc25e3000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f5fc1486000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f5fc127e000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f5fc0f75000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f5fc0d71000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
(0x00007f5fc0b5b000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5fc0791000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f5fc16a3000)