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Fix the fix for std::result_of (#4496)

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Newer compilers, such as Apple Clang 15.0, have removed `std::result_of`
as part of C++20. The build instructions provided a fix for this (by
adding a preprocessor definition), but the fix was broken.

This fixes the fix by:
* Adding the `conf` prefix for tool configurations (which had been
  forgotten).
* Passing `extra_b2_flags` to `boost` package to fix its build.
  * Define `BOOST_ASIO_HAS_STD_INVOKE_RESULT` in order to build boost
    1.77 with a newer compiler.
This commit is contained in:
John Freeman
2023-04-12 18:32:37 -05:00
committed by GitHub
parent 4f95b9d7a6
commit e75cd49313
1 changed files with 3 additions and 2 deletions
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BUILD.md
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@@ -258,10 +258,11 @@ part of C++20, e.g. Apple Clang 15.0,
then you might need to add a preprocessor definition to your bulid:
```
conan profile update 'options.boost:extra_b2_flags="define=BOOST_ASIO_HAS_STD_INVOKE_RESULT"' default
conan profile update 'env.CFLAGS="-DBOOST_ASIO_HAS_STD_INVOKE_RESULT"' default
conan profile update 'env.CXXFLAGS="-DBOOST_ASIO_HAS_STD_INVOKE_RESULT"' default
conan profile update 'tools.build:cflags+=["-DBOOST_ASIO_HAS_STD_INVOKE_RESULT"]' default
conan profile update 'tools.build:cxxflags+=["-DBOOST_ASIO_HAS_STD_INVOKE_RESULT"]' default
conan profile update 'conf.tools.build:cflags+=["-DBOOST_ASIO_HAS_STD_INVOKE_RESULT"]' default
conan profile update 'conf.tools.build:cxxflags+=["-DBOOST_ASIO_HAS_STD_INVOKE_RESULT"]' default
```