Joe RickerbyandHenry Schreiner
1d34f85c63
* Split the docs into sections * Split the options page into two pages - so the reference is more clean * Reorder/Tidy up this 'deliver' page to make auto-deploy more obvious * Fix up some links * Merge the platform docs into a single page to clean up the navbar. * Split the setup page to make a page dedicated to CI setup * Move general platform-specific information into the platforms page * Tidy up the platforms page * Remove some redundancy in the cpp/platforms docs * Clarify this section * Move another FAQ entry to the platforms page * Remove some out-of-date entries from the FAQ * A few corrections to the options page * Fix some broken links * Improve the Docker references * Update bump version filename * Improve options TOC information density * whitespace Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com> * Convert the normal test invocation to `pytest ./tests`, not placeholder --------- Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>
27 lines
1.8 KiB
Markdown
27 lines
1.8 KiB
Markdown
---
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title: Modern C++ standards
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---
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# Modern C++ standards
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Building Python wheels with modern C++ standards (C++11 and later) requires a few tricks.
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## manylinux2014 and C++20
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The past end-of-life `manylinux2014` image (based on CentOS 7) contains a version of GCC and libstdc++ that only supports C++17 and earlier standards.
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`manylinux_2_28` are newer and support all C++ standards (up to C++20).
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## macOS and deployment target versions
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The [`MACOSX_DEPLOYMENT_TARGET` environment variable](platforms.md#macos-version-compatibility) is used to set the minimum deployment target for macOS.
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However, to enable modern C++ standards, the deployment target needs to be set high enough (since older OS X/macOS versions did not have the necessary modern C++ standard library).
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To get C++17 support, Xcode 9.3+ is needed, requiring at least macOS 10.13 on the build machine. To use C++17 library features and link against the C++ runtime library, set `MACOSX_DEPLOYMENT_TARGET` to `"10.13"` or `"10.14"` (or higher) - macOS 10.13 offers partial C++17 support (e.g., the filesystem header is in experimental, offering `#include <experimental/filesystem>` instead of `#include <filesystem>`); macOS 10.14 has full C++17 support. CPython 3.12+ require 10.13+ anyway.
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However, if only C++17 compiler and standard template library (STL) features are used (not needing a C++17 runtime) it might be possible to set `MACOSX_DEPLOYMENT_TARGET` to a lower value, such as `"10.9"`. To find out if this is the case, try compiling and running with a lower `MACOSX_DEPLOYMENT_TARGET`: if C++17 features are used that require a more recent deployment target, building the wheel should fail.
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For more details see https://en.cppreference.com/w/cpp/compiler_support, https://en.wikipedia.org/wiki/Xcode, and https://xcodereleases.com/: Xcode 10 needs macOS 10.13 and Xcode 11 needs macOS 10.14.
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