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Date: Wed, 31 Mar 2021 11:56:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99828

--- Comment #10 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
> ??  obviously bad reduction.

Fixed with:

$ cat 3.i
enum { false, true } * __memcpy();
_Bool kasan_check_range();
void *memcpy(void *dest, void *src, long len) {
  if (kasan_check_range(len, false, 0) || kasan_check_range(len, true, 0))
    return __memcpy(dest, src, len);
}

char LZ4_decompress_safe_forceExtDict_lowPrefix,
    LZ4_decompress_safe_forceExtDict_op;
long LZ4_decompress_safe_forceExtDict_restSize;
void LZ4_decompress_safe_forceExtDict() {
  __builtin_memcpy(&LZ4_decompress_safe_forceExtDict_op,
                   &LZ4_decompress_safe_forceExtDict_lowPrefix,
                   LZ4_decompress_safe_forceExtDict_restSize);
}

$ gcc -r [123].o
/usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld:
warning: incremental linking of LTO and non-LTO objects; using
-flinker-output=3Dnolto-rel which will bypass whole program optimization
3.i: In function =E2=80=98LZ4_decompress_safe_forceExtDict=E2=80=99:
1.i:2:1: error: inlining failed in call to =E2=80=98always_inline=E2=80=99 =
=E2=80=98memcpy=E2=80=99: --param
max-inline-insns-auto limit reached
    2 | memcpy();
      | ^
3.i:12:3: note: called from here
   12 |   __builtin_memcpy(&LZ4_decompress_safe_forceExtDict_op,
      |   ^
lto-wrapper: fatal error: gcc returned 1 exit status
compilation terminated.
/usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld:
error: lto-wrapper failed=