[Bug target/113648] New: Cross compiler cannot find cross binutils on macOS

["galaxyking0419 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113648

            Bug ID: 113648
           Summary: Cross compiler cannot find cross binutils on macOS
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: galaxyking0419 at gmail dot com
  Target Milestone: ---

According to https://gcc.gnu.org/install/configure.html, the gcc should find
binutils components (e.g., as, ld, objdump) using rule:
- Unless GCC is being built with a cross compiler, check the
libexec/gcc/target/version directory. libexec defaults to exec-prefix/libexec;
exec-prefix defaults to prefix, which defaults to /usr/local unless overridden
by the --prefix=pathname switch described above. target is the target system
triple, such as ‘sparc-sun-solaris2.11’, and version denotes the GCC version,
such as 3.0. If the target system is the same that you are building on, check
operating system specific directories.
- Check in the PATH for a tool whose name is prefixed by the target system
triple.
- Check in the PATH for a tool whose name is not prefixed by the target system
triple, if the host and target system triple are the same (in other words, we
use a host tool if it can be used for the target as well).

My setup following the target system triple convention:
[u@mbp d]% whereis aarch64-linux-gnu-ld
aarch64-linux-gnu-ld: /Volumes/Toolchain/openwrt/bin/aarch64-linux-gnu-ld

But the aarch64-linux-gnu-gcc still picks the macOS as, ld etc:
[u@mbp d]% aarch64-linux-gnu-gcc -print-prog-name=ld
ld
[u@mbp d]% aarch64-linux-gnu-gcc -print-prog-name=as
as
[u@mbp d]% aarch64-linux-gnu-gcc -print-prog-name=objdump
objdump

GCC configuration:
Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/Volumes/Toolchain/openwrt/lib/gcc/aarch64-linux-gnu/13.2.0/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../gcc-13.2.0/configure --disable-libgomp
--disable-libquadmath --disable-libsanitizer --disable-libssp
--disable-libstdcxx-pch --disable-libunwind-exceptions --disable-multilib
--disable-nls --disable-werror --enable-__cxa_atexit --enable-checking=release
--enable-clocale=gnu --enable-default-pie --enable-gnu-indirect-function
--enable-gnu-unique-object --enable-install-libiberty --enable-languages=c,c++
--enable-lto --enable-shared --enable-threads=posix
--libexecdir=/Volumes/Toolchain/openwrt/lib --prefix=/Volumes/Toolchain/openwrt
--program-prefix=aarch64-linux-gnu- --target=aarch64-linux-gnu
--with-build-sysroot=/Volumes/Toolchain/openwrt/aarch64-linux-gnu
--with-cpu=cortex-a53+crypto --with-glibc-version=2.38 --with-gmp=/opt/homebrew
--with-mpc=/opt/homebrew --with-mpfr=/opt/homebrew
--with-local-prefix=/Volumes/Toolchain/openwrt/aarch64-linux-gnu
--with-sysroot=/Volumes/Toolchain/openwrt/aarch64-linux-gnu --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.2.0 (GCC)