V1.7.8 build failed: error: no member named 'piecewise_construct'

[tktkku]

I've tried with these lines:

% gcc --version
Apple clang version 16.0.0 (clang-1600.0.26.6)
Target: arm64-apple-darwin24.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

% clang --version
Apple clang version 16.0.0 (clang-1600.0.26.6)
Target: arm64-apple-darwin24.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

%  ./bootstrap.sh
% ./b2 # failed
% ./b2 --clear
% ./bootstrap.sh --with-toolset=gcc
% ./b2 # failed

The error:

In file included from libs/locale/src/shared/message.cpp:27:
In file included from ./boost/unordered_map.hpp:17:
In file included from ./boost/unordered/unordered_map.hpp:21:
In file included from ./boost/unordered/detail/map.hpp:6:
In file included from ./boost/unordered/detail/implementation.hpp:44:
./boost/unordered/detail/fwd.hpp:53:16: error: no member named 'piecewise_construct' in namespace 'std'; did you mean 'piecewise_construct_t'?
   53 |     using std::piecewise_construct;
      |           ~~~~~^~~~~~~~~~~~~~~~~~~
      |                piecewise_construct_t
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__utility/piecewise_construct.h:20:29: note: 'piecewise_construct_t' declared here
   20 | struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t {
      |  

Any suggestions?
Thanks.

[mclow]

Are you trying to build a library that doesn't support c++03?
Boost.Locale

I just tried the following:

~ % clang++ --version
Apple clang version 16.0.0 (clang-1600.0.26.6)
Target: arm64-apple-darwin24.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
~ % cat junk.cpp
#include <utility>

using std::piecewise_construct;
int main () {}
~ %
~ % clang++ junk.cpp -std=c++11
~ %
~ % clang++ junk.cpp          
junk.cpp:3:12: error: no member named 'piecewise_construct' in namespace 'std'; did you mean 'piecewise_construct_t'?
    3 | using std::piecewise_construct;
      |       ~~~~~^~~~~~~~~~~~~~~~~~~
      |            piecewise_construct_t
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__utility/piecewise_construct.h:20:29: note: 'piecewise_construct_t' declared here
   20 | struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t {
      |                             ^
1 error generated.

[tktkku]

I just tried these:

# 1
./bootstrap.sh
./b2 cxxflags="-std=c++03" # failed
# but if I run again with these
./b2 cxxflags="-std=c++11" # success

# 2
./bootstrap.sh
./b2 cxxflags="-std=c++11" # failed
# but if I run again with these
./b2 cxxflags="-std=c++03" # success

# 3
./bootstrap.sh
./b2  # failed
# but if I run again with these
./b2 cxxflags="-std=c++11" # success

Is this a bug of the b2?

But for version 1.7.5, I can compile successfully and don't need to set any flags.

Are you trying to build a library that doesn't support c++03? Boost.Locale

I just tried the following:

~ % clang++ --version
Apple clang version 16.0.0 (clang-1600.0.26.6)
Target: arm64-apple-darwin24.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
~ % cat junk.cpp
#include <utility>

using std::piecewise_construct;
int main () {}
~ %
~ % clang++ junk.cpp -std=c++11
~ %
~ % clang++ junk.cpp          
junk.cpp:3:12: error: no member named 'piecewise_construct' in namespace 'std'; did you mean 'piecewise_construct_t'?
    3 | using std::piecewise_construct;
      |       ~~~~~^~~~~~~~~~~~~~~~~~~
      |            piecewise_construct_t
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__utility/piecewise_construct.h:20:29: note: 'piecewise_construct_t' declared here
   20 | struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t {
      |                             ^
1 error generated.

[mclow]

I use ./b2 toolset=clang/cxxstd=11