lang/gcc12 's g++12 gets a failure on aarch64 FreeBSD (main) but not on aarch64 Fedora (36), small test case

On aarch64 FreeBSD (see the comment for the failure message):

// g++12 -std=c++20 -fmodules-ts -xc++-system-header memory
// g++12 -std=c++20 -fmodules-ts -c gpp12_module_dynamic_pointer_cast_failure.cpp
//
// gets:
//
// during IPA pass: visibility
// gpp12_dynamic_pointer_cast_failure.cpp:21:1: internal compiler error: in function_and_variable_visibility, at ipa-visibility.cc:716
//    21 | }
//       | ^

import <memory>;

struct data
{
        virtual ~data() = default;
};

void test(std::shared_ptr<data> b)
{
        auto dpc = std::dynamic_pointer_cast<data>(b);
}




Note: On FreeBSD, I do my own poudriere-devel based port builds
and install the resulting packages. For reference:

# g++12 -v
Using built-in specs.
COLLECT_GCC=g++12
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc12/gcc/aarch64-portbld-freebsd14.0/12.2.0/lto-wrapper
Target: aarch64-portbld-freebsd14.0
Configured with: /wrkdirs/usr/ports/lang/gcc12/work/gcc-12.2.0/configure --disable-multilib --disable-bootstrap --disable-nls --enable-gnu-indirect-function --enable-host-shared --enable-plugin --libdir=/usr/local/lib/gcc12 --libexecdir=/usr/local/libexec/gcc12 --program-suffix=12 --with-as=/usr/local/bin/as --with-gmp=/usr/local --with-gxx-include-dir=/usr/local/lib/gcc12/include/c++/ --with-gxx-libcxx-include-dir=/usr/include/c++/v1 --with-ld=/usr/local/bin/ld --with-pkgversion='FreeBSD Ports Collection' --with-system-zlib --without-zstd --enable-languages=c,c++,objc,fortran,jit --prefix=/usr/local --localstatedir=/var --mandir=/usr/local/man --infodir=/usr/local/share/info/gcc12 --build=aarch64-portbld-freebsd14.0
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.2.0 (FreeBSD Ports Collection) 




There was no such failure on fedora 36 via:

# c++ -std=c++20 -fmodules-ts -xc++-system-header memory
# c++ -std=c++20 -freport-bug -fmodules-ts -c gpp12_module_dynamic_pointer_cast_failure.cpp
#

where:

# c++ -v
Using built-in specs.
COLLECT_GCC=c++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-redhat-linux/12/lto-wrapper
Target: aarch64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-12.2.1-20220819/obj-aarch64-redhat-linux/isl-install --enable-gnu-indirect-function --build=aarch64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.1 20220819 (Red Hat 12.2.1-1) (GCC) 



===
Mark Millard
marklmi at yahoo.com