qpdf @11.2.0_0+gnutls: fatal error: 'string_view' file not found

[macdeport]

qpdf/work/qpdf-11.3.0/libqpdf/OffsetInputSource.cc
:info:build In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_qpdf/qpdf/work/qpdf-11.3.0/libqpdf/NNTree.cc:1:
:info:build In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_qpdf/qpdf/work/qpdf-11.3.0/libqpdf/qpdf/NNTree.hh:4:
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_qpdf/qpdf/work/qpdf-11.3.0/include/qpdf/QPDF.hh:35:10: fatal error: 'string_view' file not found
:info:build #include <string_view>
:info:build          ^
:info:build 1 error generated.
:info:build make[2]: *** [libqpdf/CMakeFiles/libqpdf_object.dir/NNTree.cc.o] Error 1
:info:build make[2]: *** Waiting for unfinished jobs....
:info:build [ 18%] Building CXX object libqpdf/CMakeFiles/libqpdf.dir/NNTree.cc.o
:info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_qpdf/

[macdeport]

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_qpdf/qpdf/main.log

[Schamschula (Marius Schamschula)]

Perhaps Yosemite needs to use newer version of clang, as string_view.h is provided by clang.

[macdeport]

$/usr/bin/clang -v
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

$port installed clang*
The following ports are currently installed:
  clang-15 @15.0.7_1+analyzer+libstdcxx (active)
  clang_select @2.2_1 (active)

$sudo port select clang mp-clang-15
Password:
Selecting 'mp-clang-15' for 'clang' succeeded. 'mp-clang-15' is now active.

$which clang
/opt/local/bin

$path
user.cs_path: /usr/bin:/bin:/usr/sbin:/sbin
PATH=/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/alain/.selenium:/Users/alain/Library/Python/3.9/bin

$clang -v
clang version 15.0.7
Target: x86_64-apple-darwin14.5.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-15/bin

Despite these settings qpdf fails to update (plese see main.log.230301.zip)

[macdeport]

with clang-15 selected

[Schamschula (Marius Schamschula)]

The main.log is still showing

:info:configure -- The C compiler identification is AppleClang 7.0.2.7000181
:info:configure -- The CXX compiler identification is AppleClang 7.0.2.7000181

[Marius Schamschula <mschamschula@…>]

In 5ad8537f863bf18f51201e15789981f181b9470f/macports-ports (master):

qpdf: use compiler.cxx_standard 2017

See: #67003

[Schamschula (Marius Schamschula)]

Unfortunately, this only runs into a second issue:

"CMakeFiles/libqpdf.dir/qpdflogger-c.cc.o" CMakeFiles/libqpdf.dir/QPDFCrypto_gnutls.cc.o CMakeFiles/libqpdf.dir/AES_PDF_native.cc.o CMakeFiles/libqpdf.dir/MD5_native.cc.o CMakeFiles/libqpdf.dir/QPDFCrypto_native.cc.o CMakeFiles/libqpdf.dir/RC4_native.cc.o CMakeFiles/libqpdf.dir/SHA2_native.cc.o CMakeFiles/libqpdf.dir/rijndael.cc.o CMakeFiles/libqpdf.dir/sha2.c.o CMakeFiles/libqpdf.dir/sha2big.c.o  -Wl,-rpath,/opt/local/lib /opt/local/lib/libz.dylib /opt/local/lib/libjpeg.dylib /opt/local/lib/libgnutls.dylib 
Undefined symbols for architecture x86_64:
  "typeinfo for std::bad_variant_access", referenced from:
      __ZNSt3__126__throw_bad_variant_accessB6v15007Ev in QPDFValue.cc.o
      __ZNSt3__126__throw_bad_variant_accessB6v15007Ev in QPDF_json.cc.o
  "vtable for std::bad_variant_access", referenced from:
      __ZNSt3__126__throw_bad_variant_accessB6v15007Ev in QPDFValue.cc.o
      __ZNSt3__126__throw_bad_variant_accessB6v15007Ev in QPDF_json.cc.o
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64

Also see #65778