Use fmt src file instead of inline in static lib build

include/spdlog/fmt/fmt.h

@@ -11,15 +11,17 @@
 //
 
 #if !defined(SPDLOG_FMT_EXTERNAL)
+#ifndef SPDLOG_STATIC_LIB
 #ifndef FMT_HEADER_ONLY
 #define FMT_HEADER_ONLY
 #endif
+#endif
 #ifndef FMT_USE_WINDOWS_H
 #define FMT_USE_WINDOWS_H 0
 #endif
 #include "bundled/core.h"
 #include "bundled/format.h"
-#else // external fmtlib
+#else // SPDLOG_FMT_EXTERNAL is defined - use external fmtlib
 #include <fmt/core.h>
 #include <fmt/format.h>
 #endif

include/spdlog/impl/fmt-format.cpp

+// Formatting library for C++
+//
+// Copyright (c) 2012 - 2016, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/format-inl.h"
+
+FMT_BEGIN_NAMESPACE
+template struct internal::basic_data<void>;
+template FMT_API internal::locale_ref::locale_ref(const std::locale &loc);
+template FMT_API std::locale internal::locale_ref::get<std::locale>() const;
+
+// Explicit instantiations for char.
+
+template FMT_API char internal::thousands_sep_impl(locale_ref);
+
+template FMT_API void internal::basic_buffer<char>::append(const char *, const char *);
+
+template FMT_API void internal::arg_map<format_context>::init(
+    const basic_format_args<format_context> &args);
+
+template FMT_API int internal::char_traits<char>::format_float(
+    char *, std::size_t, const char *, int, double);
+
+template FMT_API int internal::char_traits<char>::format_float(
+    char *, std::size_t, const char *, int, long double);
+
+template FMT_API std::string internal::vformat<char>(
+    string_view, basic_format_args<format_context>);
+
+template FMT_API format_context::iterator internal::vformat_to(
+    internal::buffer &, string_view, basic_format_args<format_context>);
+
+template FMT_API void internal::sprintf_format(
+    double, internal::buffer &, core_format_specs);
+template FMT_API void internal::sprintf_format(
+    long double, internal::buffer &, core_format_specs);
+
+// Explicit instantiations for wchar_t.
+
+template FMT_API wchar_t internal::thousands_sep_impl(locale_ref);
+
+template FMT_API void internal::basic_buffer<wchar_t>::append(
+    const wchar_t *, const wchar_t *);
+
+template FMT_API void internal::arg_map<wformat_context>::init(
+    const basic_format_args<wformat_context> &);
+
+template FMT_API int internal::char_traits<wchar_t>::format_float(
+    wchar_t *, std::size_t, const wchar_t *, int, double);
+
+template FMT_API int internal::char_traits<wchar_t>::format_float(
+    wchar_t *, std::size_t, const wchar_t *, int, long double);
+
+template FMT_API std::wstring internal::vformat<wchar_t>(
+    wstring_view, basic_format_args<wformat_context>);
+FMT_END_NAMESPACE