On 2020-02-01 16:50 -0600, Bruce Dubbs via lfs-dev wrote:
> I am building a fresh LFS with the latest glibc and binutils and ran
> into a problem when building gcc-pass2 in Chapter 5.
>
> linux-5.5.1
> glibc-2.31
> binutils-2.34
>
> What the error looks like is somewhat complex and it looks like (long
> lines so there is wrapping in the email):
>
> In file included from
> ../../../../libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:1
> 93:
> ../../../../libsanitizer/sanitizer_common/sanitizer_internal_defs.h:339:72:
> error: narrowing conversion of '-1' from 'int' to 'long unsigned int'
> [-Wnarrowing]
> 339 | typedef char IMPL_PASTE(assertion_failed_##_,
> line)[2*(int)(pred)-1]
> |
> ^
> ../../../../libsanitizer/sanitizer_common/sanitizer_internal_defs.h:333:30:
> note: in expansion of macro 'IMPL_COMPILER_ASSERT'
> 333 | #define COMPILER_CHECK(pred) IMPL_COMPILER_ASSERT(pred, __LINE__)
>
> ../../../../libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h:15
> 11:3:
> note: in expansion of macro 'COMPILER_CHECK'
> 1511 | COMPILER_CHECK(sizeof(((__sanitizer_##CLASS *) NULL)->MEMBER)
> == \
>
> ../../../../libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:1
> 161:1:
> note: in expansion of macro 'CHECK_SIZE_AND_OFFSET'
> 1161 | CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
>
>
> The command line includes -Werror even if I specify --disable-werror in
> configure.
>
> I've been able to work around the problem with:
>
> sed -e '1161 s|^|//|' \
> -i libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
>
> and it is probably all right since it is just an internal assertion check.
I don't think it's right.
It's a "static assertion":
char _static_assert_233[something_should_be_true() ? 1 : -1];
It makes the compilation to fail if something is out of the developers's
assumption.
I think GCC needs some fixes for Glibc-2.31. I'll search through GCC trunk.
--
Xi Ruoyao <xry...@mengyan1223.wang>
School of Aerospace Science and Technology, Xidian University
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