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Create separate dllexport marking points for clang and msvc. (#2229)

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* add FMT_INSTANTIATION_DEF_API for msvc

This should fix https://github.com/fmtlib/fmt/issues/2228

To fix difference dllexport requirements
msvc:  dllexport at template instantiation definition in format.cc
clang: dllexport at template instantiation declaration (extern template) in format.h
This commit is contained in:
denchat 2021-04-17 02:34:18 +07:00 committed by GitHub
parent f4bbc54cc4
commit 52bd62c72f
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 16 additions and 3 deletions
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15
include/fmt/core.h
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@ -233,8 +233,19 @@
#ifndef FMT_EXTERN_TEMPLATE_API
# define FMT_EXTERN_TEMPLATE_API
#endif
#ifndef FMT_INSTANTIATION_DECL_API
# define FMT_INSTANTIATION_DECL_API FMT_API
#ifndef FMT_INSTANTIATION_DECL_API // clang marks dllexport at extern template.
# ifndef _MSC_VER
# define FMT_INSTANTIATION_DECL_API FMT_API
# else
# define FMT_INSTANTIATION_DECL_API
# endif
#endif
#ifndef FMT_INSTANTIATION_DEF_API // msvc marks dllexport at the definition itself.
# ifndef _MSC_VER
# define FMT_INSTANTIATION_DEF_API
# else
# define FMT_INSTANTIATION_DEF_API FMT_API
# endif
#endif
#ifndef FMT_HEADER_ONLY

2
include/fmt/format.h
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@ -998,7 +998,9 @@ FMT_INLINE uint16_t bsr2log10(int bsr) {
return data[bsr];
}
#ifndef FMT_EXPORTED
FMT_EXTERN template struct FMT_INSTANTIATION_DECL_API basic_data<void>;
#endif
// This is a struct rather than an alias to avoid shadowing warnings in gcc.
struct data : basic_data<> {};

2
src/format.cc
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@ -57,7 +57,7 @@ vformat_to(buffer<char>&, string_view,
// Clang doesn't allow dllexport on template instantiation definitions:
// https://reviews.llvm.org/D61118.
template struct detail::basic_data<void>;
template struct FMT_INSTANTIATION_DEF_API detail::basic_data<void>;
// Workaround a bug in MSVC2013 that prevents instantiation of format_float.
int (*instantiate_format_float)(double, int, detail::float_specs,