Re: The time_zone tests that fail

Jonathan Wakely via Gcc-help <gcc-help@xxxxxxxxxxx> · Wed, 12 Mar 2025 20:19:16 +0000

On Wed, 12 Mar 2025 at 20:11, Dennis Clarke <dclarke@xxxxxxxxxxxxx> wrote:
>
> On 3/12/25 15:59, Jonathan Wakely wrote:
> > On Wed, 12 Mar 2025 at 19:58, Dennis Clarke <dclarke@xxxxxxxxxxxxx> wrote:
> >>
> >> On 3/12/25 15:42, Jonathan Wakely wrote:
> ...
>
> >> hrmmm ... baffling fail for me.
> >
> > Oh you need to use -std=c++20
> >
> >
>
> Oh, that seems to work.
>
> t$
> t$ which g++
> /opt/bw/gcc14/bin/g++
> t$
> t$ g++ -std=c++20 -v -c -o tz_test.o tz_test.cpp
> Using built-in specs.
> COLLECT_GCC=g++
> Target: x86_64-linux-gnu
> Configured with: ../gcc-14.2.0/configure --prefix=/opt/bw/gcc14
> --with-gnu-as --with-as=/opt/bw/bin/gas --with-gnu-ld
> --with-ld=/opt/bw/bin/gld --disable-nls --disable-multilib
> --enable-threads=posix --enable-shared
> --with-build-time-tools=/opt/bw/bin --enable-bootstrap
> --with-tune=generic --enable-linker-build-id --without-cuda-driver
> --enable-__cxa_atexit --with-default-libstdcxx-abi=new --enable-tls
> --enable-gnu-unique-object --enable-default-pie --with-abi=m64
> --build=x86_64-linux-gnu --host=x86_64-linux-gnu
> --target=x86_64-linux-gnu --with-pkgversion='GENUNIX Tue Mar 11 17:29:45
> UTC 2025'
> Thread model: posix
> Supported LTO compression algorithms: zlib
> gcc version 14.2.0 (GENUNIX Tue Mar 11 17:29:45 UTC 2025)
> COLLECT_GCC_OPTIONS='-std=c++20' '-v' '-c' '-o' 'tz_test.o'
> '-shared-libgcc' '-mtune=generic' '-march=x86-64'
>   /opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/cc1plus -quiet -v
> -imultiarch x86_64-linux-gnu -D_GNU_SOURCE tz_test.cpp -quiet -dumpbase
> tz_test.cpp -dumpbase-ext .cpp -mtune=generic -march=x86-64 -std=c++20
> -version -o /var/tmp/dclarke/ccQl81Rk.s
> GNU C++20 (GENUNIX Tue Mar 11 17:29:45 UTC 2025) version 14.2.0
> (x86_64-linux-gnu)
>          compiled by GNU C version 14.2.0, GMP version 6.3.0, MPFR
> version 4.2.1, MPC version 1.3.1, isl version isl-0.24-GMP
>
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
> ignoring nonexistent directory "/usr/local/include"
> ignoring nonexistent directory
> "/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/include-fixed/x86_64-linux-gnu"
> ignoring nonexistent directory
> "/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../x86_64-linux-gnu/include"
> #include "..." search starts here:
> #include <...> search starts here:
>
> /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0
>
> /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0/x86_64-linux-gnu
>
> /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0/backward
>   /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/include
>   /opt/bw/gcc14/include
>   /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/include-fixed
>   /usr/include/x86_64-linux-gnu
>   /usr/include
> End of search list.
> Compiler executable checksum: 535b3d6b2f041edb1bee904d2c29ef0f
> COLLECT_GCC_OPTIONS='-std=c++20' '-v' '-c' '-o' 'tz_test.o'
> '-shared-libgcc' '-mtune=generic' '-march=x86-64'
>   /opt/bw/bin/gas -v --64 -o tz_test.o /var/tmp/dclarke/ccQl81Rk.s
> GNU assembler version 2.44 (x86_64-pc-linux-gnu) using BFD version
> (GENUNIX Mon Mar 10 16:45:34 UTC 2025) 2.44
> COMPILER_PATH=/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/
> LIBRARY_PATH=/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../:/lib/:/usr/lib/
> COLLECT_GCC_OPTIONS='-std=c++20' '-v' '-c' '-o' 'tz_test.o'
> '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' 'tz_test.'
> t$
>
> However ... not able to make an executable :
>
> t$
> t$ g++ -std=c++20 -v -o tz_test tz_test.o
> Using built-in specs.
> COLLECT_GCC=g++
> COLLECT_LTO_WRAPPER=/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/lto-wrapper
> Target: x86_64-linux-gnu
> Configured with: ../gcc-14.2.0/configure --prefix=/opt/bw/gcc14
> --with-gnu-as --with-as=/opt/bw/bin/gas --with-gnu-ld
> --with-ld=/opt/bw/bin/gld --disable-nls --disable-multilib
> --enable-threads=posix --enable-shared
> --with-build-time-tools=/opt/bw/bin --enable-bootstrap
> --with-tune=generic --enable-linker-build-id --without-cuda-driver
> --enable-__cxa_atexit --with-default-libstdcxx-abi=new --enable-tls
> --enable-gnu-unique-object --enable-default-pie --with-abi=m64
> --build=x86_64-linux-gnu --host=x86_64-linux-gnu
> --target=x86_64-linux-gnu --with-pkgversion='GENUNIX Tue Mar 11 17:29:45
> UTC 2025'
> Thread model: posix
> Supported LTO compression algorithms: zlib
> gcc version 14.2.0 (GENUNIX Tue Mar 11 17:29:45 UTC 2025)
> COMPILER_PATH=/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/
> LIBRARY_PATH=/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../:/lib/:/usr/lib/
> COLLECT_GCC_OPTIONS='-std=c++20' '-v' '-o' 'tz_test' '-shared-libgcc'
> '-mtune=generic' '-march=x86-64' '-dumpdir' 'tz_test.'
>   /opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/collect2 -plugin
> /opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/liblto_plugin.so
> -plugin-opt=/opt/bw/gcc14/libexec/gcc/x86_64-linux-gnu/14.2.0/lto-wrapper
> -plugin-opt=-fresolution=/var/tmp/dclarke/ccJJOCX3.res
> -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
> -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s
> -plugin-opt=-pass-through=-lgcc --build-id --eh-frame-hdr -m elf_x86_64
> -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -o tz_test
> /usr/lib/x86_64-linux-gnu/Scrt1.o /usr/lib/x86_64-linux-gnu/crti.o
> /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/crtbeginS.o
> -L/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0
> -L/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../lib64
> -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
> -L/opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/../../.. tz_test.o
> -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
> /opt/bw/gcc14/lib/gcc/x86_64-linux-gnu/14.2.0/crtendS.o
> /usr/lib/x86_64-linux-gnu/crtn.o
> COLLECT_GCC_OPTIONS='-std=c++20' '-v' '-o' 'tz_test' '-shared-libgcc'
> '-mtune=generic' '-march=x86-64' '-dumpdir' 'tz_test.'
> t$
> t$ ldd ./tz_test
> ./tz_test: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version
> `GLIBCXX_3.4.32' not found (required by ./tz_test)
> ./tz_test: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version
> `GLIBCXX_3.4.31' not found (required by ./tz_test)
>          linux-vdso.so.1 (0x00007fffe3b5c000)
>          libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
> (0x00007faaf6a00000)
>          libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007faaf6cc6000)
>          libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
> (0x00007faaf6ca6000)
>          libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007faaf681f000)
>          /lib64/ld-linux-x86-64.so.2 (0x00007faaf6db4000)
> t$
>
> t$
> t$ ./tz_test
> ./tz_test: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version
> `GLIBCXX_3.4.32' not found (required by ./tz_test)
> ./tz_test: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version
> `GLIBCXX_3.4.31' not found (required by ./tz_test)
> t$
>
> Now this is getting strange.

No it isn't:
https://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.how_to_set_paths

You can just use -static-libstdc++ for this test.