Fix TU-local entity exposition errors in GCC 15

Author: tkhyn

include/fmt/format-inl.h

@@ -212,7 +212,7 @@ inline auto floor_log10_pow2_minus_log10_4_over_3(int e) noexcept -> int {
   return (e * 631305 - 261663) >> 21;
 }
 
-FMT_INLINE_VARIABLE constexpr struct {
+FMT_INLINE_VARIABLE constexpr struct div_small_pow10_infos_struct {
   uint32_t divisor;
   int shift_amount;
 } div_small_pow10_infos[] = {{10, 16}, {100, 16}};

src/os.cc

@@ -61,18 +61,12 @@
 
 namespace {
 #ifdef _WIN32
-// Return type of read and write functions.
-using rwresult = int;
-
 // On Windows the count argument to read and write is unsigned, so convert
 // it from size_t preventing integer overflow.
 inline unsigned convert_rwcount(std::size_t count) {
   return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;
 }
 #elif FMT_USE_FCNTL
-// Return type of read and write functions.
-using rwresult = ssize_t;
-
 inline std::size_t convert_rwcount(std::size_t count) { return count; }
 #endif
 }  // namespace
@@ -266,6 +260,14 @@ long long file::size() const {
 #  endif
 }
 
+
+// Return type of read and write functions.
+#  ifdef _WIN32
+#    define rwresult int
+#  elif FMT_USE_FCNTL
+#    define rwresult ssize_t
+#  endif
+
 std::size_t file::read(void* buffer, std::size_t count) {
   rwresult result = 0;
   FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, convert_rwcount(count))));
@@ -282,6 +284,8 @@ std::size_t file::write(const void* buffer, std::size_t count) {
   return detail::to_unsigned(result);
 }
 
+#  undef rwresult
+
 file file::dup(int fd) {
   // Don't retry as dup doesn't return EINTR.
   // http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html