added FMT_API declarations where needed when using FMT_EXPORT from a separate dll

(cherry picked from commit ad6d78f2)

fmt/format.cc

@@ -911,14 +911,14 @@ template void fmt::internal::FixedBuffer<char>::grow(std::size_t);
 
 template void fmt::internal::ArgMap<char>::init(const fmt::ArgList &args);
 
-template void fmt::internal::PrintfFormatter<char>::format(
+template FMT_API void fmt::internal::PrintfFormatter<char>::format(
   BasicWriter<char> &writer, CStringRef format);
 
-template int fmt::internal::CharTraits<char>::format_float(
+template FMT_API int fmt::internal::CharTraits<char>::format_float(
     char *buffer, std::size_t size, const char *format,
     unsigned width, int precision, double value);
 
-template int fmt::internal::CharTraits<char>::format_float(
+template FMT_API int fmt::internal::CharTraits<char>::format_float(
     char *buffer, std::size_t size, const char *format,
     unsigned width, int precision, long double value);
 
@@ -928,14 +928,14 @@ template void fmt::internal::FixedBuffer<wchar_t>::grow(std::size_t);
 
 template void fmt::internal::ArgMap<wchar_t>::init(const fmt::ArgList &args);
 
-template void fmt::internal::PrintfFormatter<wchar_t>::format(
+template FMT_API void fmt::internal::PrintfFormatter<wchar_t>::format(
     BasicWriter<wchar_t> &writer, WCStringRef format);
 
-template int fmt::internal::CharTraits<wchar_t>::format_float(
+template FMT_API int fmt::internal::CharTraits<wchar_t>::format_float(
     wchar_t *buffer, std::size_t size, const wchar_t *format,
     unsigned width, int precision, double value);
 
-template int fmt::internal::CharTraits<wchar_t>::format_float(
+template int FMT_API fmt::internal::CharTraits<wchar_t>::format_float(
     wchar_t *buffer, std::size_t size, const wchar_t *format,
     unsigned width, int precision, long double value);
 

fmt/format.h

@@ -583,7 +583,7 @@ class FormatError : public std::runtime_error {
   explicit FormatError(CStringRef message)
   : std::runtime_error(message.c_str()) {}
   FormatError(const FormatError &ferr) : std::runtime_error(ferr) {}
-  ~FormatError() FMT_DTOR_NOEXCEPT;
+  FMT_API ~FormatError() FMT_DTOR_NOEXCEPT;
 };
 
 namespace internal {
@@ -1380,7 +1380,7 @@ class RuntimeError : public std::runtime_error {
  protected:
   RuntimeError() : std::runtime_error("") {}
   RuntimeError(const RuntimeError &rerr) : std::runtime_error(rerr) {}
-  ~RuntimeError() FMT_DTOR_NOEXCEPT;
+  FMT_API ~RuntimeError() FMT_DTOR_NOEXCEPT;
 };
 
 template <typename Char>
@@ -2319,7 +2319,7 @@ inline uint64_t make_type(FMT_GEN15(FMT_ARG_TYPE_DEFAULT)) {
 */
 class SystemError : public internal::RuntimeError {
  private:
-  void init(int err_code, CStringRef format_str, ArgList args);
+  FMT_API void init(int err_code, CStringRef format_str, ArgList args);
 
  protected:
   int error_code_;
@@ -2359,7 +2359,7 @@ class SystemError : public internal::RuntimeError {
   }
   FMT_VARIADIC_CTOR(SystemError, init, int, CStringRef)
 
-  ~SystemError() FMT_DTOR_NOEXCEPT;
+  FMT_API ~SystemError() FMT_DTOR_NOEXCEPT;
 
   int error_code() const { return error_code_; }
 };