Re: The time_zone tests that fail

Dennis Clarke via Gcc-help <gcc-help@xxxxxxxxxxx> · Wed, 12 Mar 2025 16:56:43 -0400

On 3/12/25 16:19, Jonathan Wakely wrote:
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.

This sort of thing is none too helpful :

t$
t$ LD_LIBRARY_PATH=/opt/bw/lib ./tz_test
ersatz
t$
t$ LD_LIBRARY_PATH=/opt/bw/gcc14/lib64 ./tz_test
ersatz
t$

So I need to remove the default system GCC packages and then drop the
new /opt/bw/gcc14/lib64/libstdc++.so.6.0.33 thing into a well known
location for GCC to work right ? Really ?

--
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken