[Bug sanitizer/109533] New: Build failure with upcoming musl release (sanitizer_platform_limits_posix.cpp:182:31: error: invalid application of 'sizeof' to incomplete type '__sanitizer::stat64')

["sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109533

            Bug ID: 109533
           Summary: Build failure with upcoming musl release
                    (sanitizer_platform_limits_posix.cpp:182:31: error:
                    invalid application of 'sizeof' to incomplete type
                    '__sanitizer::stat64')
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.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: ---

The upcoming musl-1.2.4 release drops LFS aliases which were intended as a
compatibility shim.

Explanation of the change: https://bugs.gentoo.org/903611#c0.

The failure is like:
```
libtool: compile: 
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/build/./gcc/xgcc
-shared-libgcc
-B/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/build/./gcc
-nostdinc++
-L/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/build/riscv64-gentoo-linux-musl/libstdc++-v3/src
-L/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/build/riscv64-gentoo-linux-musl/libstdc++-v3/src/.libs
-L/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/build/riscv64-gentoo-linux-musl/libstdc++-v3/libsupc++/.libs
-B/usr/riscv64-gentoo-linux-musl/bin/ -B/usr/riscv64-gentoo-linux-musl/lib/
-isystem /usr/riscv64-gentoo-linux-musl/include -isystem
/usr/riscv64-gentoo-linux-musl/sys-include -fchecking=1 -D_GNU_SOURCE -D_DEBUG
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-DHAVE_RPC_XDR_H=0 -DHAVE_TIRPC_RPC_XDR_H=0 -I.
-I/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/sanitizer_common
-I.. -I
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/include
-I
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer
-isystem
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/include/system
-Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -fPIC
-fno-builtin -fno-exceptions -fno-rtti -fomit-frame-pointer -funwind-tables
-fvisibility=hidden -Wno-variadic-macros -I../../libstdc++-v3/include
-I../../libstdc++-v3/include/riscv64-gentoo-linux-musl
-I/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/../libstdc++-v3/libsupc++
-std=gnu++14 -DSANITIZER_LIBBACKTRACE -DSANITIZER_CP_DEMANGLE -I
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/../libbacktrace
-I ../libbacktrace -I
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/../include
-include
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/libbacktrace/backtrace-rename.h
-g -pipe -march=rv64imafd -O2 -D_GNU_SOURCE -MT
sanitizer_platform_limits_linux.lo -MD -MP -MF
.deps/sanitizer_platform_limits_linux.Tpo -c
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cpp
 -fPIC -DPIC -o .libs/sanitizer_platform_limits_linux.o
/var/tmp/portage/sys-devel/gcc-12.2.1_p20230121-r1/work/gcc-12-20230121/libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cpp:65:33:
error: invalid application of 'sizeof' to incomplete type
'__sanitizer::statfs64'
   65 |   unsigned struct_statfs64_sz = sizeof(struct statfs64);
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~
make[4]: *** [Makefile:616: sanitizer_platform_limits_linux.lo] Error 1
```

This is fixed on the LLVM side in
https://github.com/llvm/llvm-project/commit/a5519b99bc73d50f362d6fb306411e9fcb758b53
(https://reviews.llvm.org/D141186) but needs to be backported on the GCC side.