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Disable non-type template args for nvhpc #3053

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merged 1 commit into from
Aug 24, 2022
Merged

Disable non-type template args for nvhpc #3053

merged 1 commit into from
Aug 24, 2022

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bernhardmgruber
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Hi!

When I use fmt in a project with nvhpc as compiler in C++20 mode, I get the following error:

"/usr/local/share/vcpkg/installed/x64-linux/include/fmt/format.h", line 4138: error: a literal operator template must have a template parameter list equivalent to "<char ...>"
  template <detail_exported::fixed_string Str> constexpr auto operator""_a() {
                                                              ^

In spirit of #742, the use of non-type template paramters could also be disabled for nvhpc. This is what this PR proposes.

Workaround for now: I can specify -DFMT_USE_NONTYPE_TEMPLATE_ARGS=0 in my project.

vitaut
vitaut reviewed Aug 23, 2022
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include/fmt/core.h Outdated
Comment on lines 277 to 280
# if defined(__cpp_nontype_template_args) && \
((FMT_GCC_VERSION >= 903 && FMT_CPLUSPLUS >= 201709L) || \
__cpp_nontype_template_args >= 201911L)
__cpp_nontype_template_args >= 201911L) && \
!defined(_NVCOMPILER)
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Why do we need to exclude _NVCOMPILER, i.e. why does it pass the above condition if nontype template parameters are not supported?

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__NVCOMPILER
https://docs.nvidia.com/hpc-sdk/archive/22.1/compilers/hpc-compilers-ref-guide/index.html#unique_803747402

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Yeah, but does it lie about __cpp_nontype_template_args or incorrectly masquerades as gcc?

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This may not be a nvhpc issue.

NTTP support - is EDG-frontend feature.

See:
https://www.edg.com/c/features
https://docs.google.com/spreadsheets/d/1H-aqjzVI2a-XQKGtw0xaS0tyjD0FcoQP8ttJI9JZQTc/edit#gid=0
https://www.edg.com/docs/edg_cpp.pdf

Non-Type Template Parameters: Class Types in Non-Type Template Parameters - Release 6.2 (partial gcc-9 compatible).

We need to check the __EDG_VERSION__ value, but I can't find the versioning scheme.

nvhpc 22.7 defined __EDG_VERSION__ as 603.

I assume that need to check the condition:

(!defined(__EDG_VERSION__) || __EDG_VERSION__ >= 620)

I will try to clarify this question with the compiler developers.

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So nvc++ (nvhpc version 22.7) on my system (Ubuntu 22.04), compiling with -std=gnu++20 defines:

#define __cpp_nontype_template_args 201911L
#define __cplusplus 202002L
#define __GNUC__ 11
#define __GNUC_MINOR__ 2

fmt recognizes that it is not gcc and defines:

#define FMT_GCC_VERSION 0

However, since nvhpc defines __cpp_nontype_template_args 201911L, it passes the #if and sets FMT_USE_NONTYPE_TEMPLATE_ARGS 1, which later causes the error mentioned in the OP.

Feel free to suggest a better fix! :)

And @phprus thank you for catching my typo!

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I verified locally again that my diff fixes compilation.

@vitaut vitaut merged commit 665d977 into fmtlib:master Aug 24, 2022
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vitaut commented Aug 24, 2022

Thank you

@bernhardmgruber bernhardmgruber deleted the nvhpc branch August 25, 2022 09:51
@bernhardmgruber
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Thank you

Well, thank you for providing this amazing library! :)

@phprus phprus mentioned this pull request Aug 27, 2022
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mtremer referenced this pull request in ipfire/ipfire-2.x Nov 28, 2022
@pmu-ipf
fmt: Update to version 9.1.0
90d43e5 
- Update from version 9.0.0 to 9.1.0
- Update of rootfile
- Changelog
    9.1.0 - 2022-08-27
	* ``fmt::formatted_size`` now works at compile time
		  `#3026 <https://github.com/fmtlib/fmt/pull/3026>`_
			  For example (`godbolt <https://godbolt.org/z/1MW5rMdf8>`__):
			   .. code:: c++
			     #include <fmt/compile.h>
			     int main() {
			       using namespace fmt::literals;
			       constexpr size_t n = fmt::formatted_size("{}"_cf, 42);
			       fmt::print("{}\n", n); // prints 2
			     }
	* Fixed handling of invalid UTF-8
		  `#3038 <https://github.com/fmtlib/fmt/pull/3038>`_,
		  `#3044 <https://github.com/fmtlib/fmt/pull/3044>`_,
		  `#3056 <https://github.com/fmtlib/fmt/pull/3056>`_
	* Improved Unicode support in ``ostream`` overloads of ``print``
		  `#2994 <https://github.com/fmtlib/fmt/pull/2994>`_,
		  `#3001 <https://github.com/fmtlib/fmt/pull/3001>`_,
		  `#3025 <https://github.com/fmtlib/fmt/pull/3025>`_
	* Fixed handling of the sign specifier in localized formatting on systems with
	   32-bit ``wchar_t``
		  `#3041 <https://github.com/fmtlib/fmt/issues/3041>`_).
	* Added support for wide streams to ``fmt::streamed``
		  `#2994 <https://github.com/fmtlib/fmt/pull/2994>`_
	* Added the ``n`` specifier that disables the output of delimiters when
	   formatting ranges
		  `#2981 <https://github.com/fmtlib/fmt/pull/2981>`_,
		  `#2983 <https://github.com/fmtlib/fmt/pull/2983>`_
			  For example (`godbolt <https://godbolt.org/z/roKqGdj8c>`__):
			   .. code:: c++
			     #include <fmt/ranges.h>
			     #include <vector>
			     int main() {
			       auto v = std::vector{1, 2, 3};
			       fmt::print("{:n}\n", v); // prints 1, 2, 3
			     }
	* Worked around problematic ``std::string_view`` constructors introduced in C++23
		  `#3030 <https://github.com/fmtlib/fmt/issues/3030>`_,
		  `#3050 <https://github.com/fmtlib/fmt/issues/3050>`_
	* Improve handling (exclusion) of recursive ranges
		  `#2968 <https://github.com/fmtlib/fmt/issues/2968>`_,
		  `#2974 <https://github.com/fmtlib/fmt/pull/2974>`_
	* Improved error reporting in format string compilation
		  `#3055 <https://github.com/fmtlib/fmt/issues/3055>`_
	* Improved the implementation of
		  `Dragonbox <https://github.com/jk-jeon/dragonbox>`_, the algorithm used for
		   the default floating-point formatting
		  `#2984 <https://github.com/fmtlib/fmt/pull/2984>`_
	* Fixed issues with floating-point formatting on exotic platforms.
	* Improved the implementation of chrono formatting
		  `#3010 <https://github.com/fmtlib/fmt/pull/3010>`_
	* Improved documentation
		  `#2966 <https://github.com/fmtlib/fmt/pull/2966>`_,
		  `#3009 <https://github.com/fmtlib/fmt/pull/3009>`_,
		  `#3020 <https://github.com/fmtlib/fmt/issues/3020>`_,
		  `#3037 <https://github.com/fmtlib/fmt/pull/3037>`_
	* Improved build configuration
		  `#2991 <https://github.com/fmtlib/fmt/pull/2991>`_,
		  `#2995 <https://github.com/fmtlib/fmt/pull/2995>`_,
		  `#3004 <https://github.com/fmtlib/fmt/issues/3004>`_,
		  `#3007 <https://github.com/fmtlib/fmt/pull/3007>`_,
		  `#3040 <https://github.com/fmtlib/fmt/pull/3040>`_
	* Fixed various warnings and compilation issues
		  `#2969 <https://github.com/fmtlib/fmt/issues/2969>`_,
		  `#2971 <https://github.com/fmtlib/fmt/pull/2971>`_,
		  `#2975 <https://github.com/fmtlib/fmt/issues/2975>`_,
		  `#2982 <https://github.com/fmtlib/fmt/pull/2982>`_,
		  `#2985 <https://github.com/fmtlib/fmt/pull/2985>`_,
		  `#2988 <https://github.com/fmtlib/fmt/issues/2988>`_,
		  `#3000 <https://github.com/fmtlib/fmt/issues/3000>`_,
		  `#3006 <https://github.com/fmtlib/fmt/issues/3006>`_,
		  `#3014 <https://github.com/fmtlib/fmt/issues/3014>`_,
		  `#3015 <https://github.com/fmtlib/fmt/issues/3015>`_,
		  `#3021 <https://github.com/fmtlib/fmt/pull/3021>`_,
		  `#3023 <https://github.com/fmtlib/fmt/issues/3023>`_,
		  `#3024 <https://github.com/fmtlib/fmt/pull/3024>`_,
		  `#3029 <https://github.com/fmtlib/fmt/pull/3029>`_,
		  `#3043 <https://github.com/fmtlib/fmt/pull/3043>`_,
		  `#3052 <https://github.com/fmtlib/fmt/issues/3052>`_,
		  `#3053 <https://github.com/fmtlib/fmt/pull/3053>`_,
		  `#3054 <https://github.com/fmtlib/fmt/pull/3054>`_

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
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@bernhardmgruber @vitaut @phprus