Re: BOOST_NO_CXX11_HDR_CHRONO?

From: John Maddock (jz.maddock_at_[hidden])
Date: 2020-05-15 15:36:14

On 15/05/2020 14:40, Frédéric via Boost wrote:
> Hi,
>
> When I compile the following program:
> #include <boost/math/constants/constants.hpp>
> #include <chrono>
> int main() {
>    return 0;
> }
> with a osx cross compiler based on clang 9 on linux,I get the
> following warnings (full output below):
> CAUTION: This message was generated due to the define:
> BOOST_NO_CXX11_HDR_CHRONO [-W#pragma-messages]
>
> This is quite strange as the compiler generates the binary which means
> there was no issue to find <chrono>.
>
> What's wrong then?

No idea.  What's the std lib? libc++ ?

<chrono> support is enabled for _LIBCPP_VERSION >= 3700 and  __cplusplus 
 >= 201103 do those conditions hold?

Best, John.

>
> Kind regards,
>
> F
>
> $ x86_64-apple-darwin13-clang++-libc++ -o boost_math_constants -Wall
> -Wextra -std=c++14 -m64 -mmacosx-version-min=10.9
> -I/softs/osx64-clang-9.0.1/release/boost/include
> boost_math_constants.cpp
> In file included from Progs/boost_math_constants.cpp:1:
> In file included from
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/constants/constants.hpp:11:
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/tools/cxx03_warn.hpp:99:1:
> warning: CAUTION: One or more C++11 features were found to be
> unavailable [-W#pragma-messages]
> BOOST_PRAGMA_MESSAGE("CAUTION: One or more C++11 features were found
> to be unavailable")
> ^
> /softs/osx64-clang-9.0.1/release/boost/include/boost/config/pragma_message.hpp:24:34:
> note: expanded from macro 'BOOST_PRAGMA_MESSAGE'
> # define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
>                                   ^
> <scratch space>:307:2: note: expanded from here
>   message("CAUTION: One or more C++11 features were found to be unavailable")
>   ^
> In file included from Progs/boost_math_constants.cpp:1:
> In file included from
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/constants/constants.hpp:11:
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/tools/cxx03_warn.hpp:100:1:
> warning: CAUTION: Compiling Boost.Math in pre-C++11 conformance modes
> is now deprecated and will be removed from March 2021.
> [-W#pragma-messages]
> BOOST_PRAGMA_MESSAGE("CAUTION: Compiling Boost.Math in pre-C++11
> conformance modes is now deprecated and will be removed from March
> 2021.")
> ^
> /softs/osx64-clang-9.0.1/release/boost/include/boost/config/pragma_message.hpp:24:34:
> note: expanded from macro 'BOOST_PRAGMA_MESSAGE'
> # define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
>                                   ^
> <scratch space>:310:2: note: expanded from here
>   message("CAUTION: Compiling Boost.Math in pre-C++11 conformance modes
> is now deprecated and will be removed from March 2021.")
>   ^
> In file included from Progs/boost_math_constants.cpp:1:
> In file included from
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/constants/constants.hpp:11:
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/tools/cxx03_warn.hpp:101:1:
> warning: CAUTION: Define BOOST_MATH_DISABLE_DEPRECATED_03_WARNING to
> suppress this message. [-W#pragma-messages]
> BOOST_PRAGMA_MESSAGE("CAUTION: Define
> BOOST_MATH_DISABLE_DEPRECATED_03_WARNING to suppress this message.")
> ^
> /softs/osx64-clang-9.0.1/release/boost/include/boost/config/pragma_message.hpp:24:34:
> note: expanded from macro 'BOOST_PRAGMA_MESSAGE'
> # define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
>                                   ^
> <scratch space>:313:2: note: expanded from here
>   message("CAUTION: Define BOOST_MATH_DISABLE_DEPRECATED_03_WARNING to
> suppress this message.")
>   ^
> In file included from Progs/boost_math_constants.cpp:1:
> In file included from
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/constants/constants.hpp:11:
> /softs/osx64-clang-9.0.1/release/boost/include/boost/math/tools/cxx03_warn.hpp:102:1:
> warning: CAUTION: This message was generated due to the define:
> BOOST_NO_CXX11_HDR_CHRONO [-W#pragma-messages]
> BOOST_PRAGMA_MESSAGE("CAUTION: This message was generated due to the
> define: " BOOST_MATH_CXX03_WARN_REASON)
> ^
> /softs/osx64-clang-9.0.1/release/boost/include/boost/config/pragma_message.hpp:24:34:
> note: expanded from macro 'BOOST_PRAGMA_MESSAGE'
> # define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
>                                   ^
> <scratch space>:316:2: note: expanded from here
>   message("CAUTION: This message was generated due to the define: "
> "BOOST_NO_CXX11_HDR_CHRONO")
>   ^
> 4 warnings generated.
>
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