Fix a build error on Windows.

Author: byzin

.gitignore

@@ -46,6 +46,7 @@
 !/source/dependencies/cpu_features
 !/source/dependencies/libspng
 !/source/dependencies/libspng_cmake
+!/source/dependencies/libspng_cmake/CMakeLists.txt
 !/source/dependencies/tinygltf
 !/source/dependencies/Zisc
 !/source/dependencies/Zivc

source/dependencies/libspng_cmake/CMakeLists.txt

@@ -30,9 +30,9 @@ macro(Nanairo_setSpngProject)
   source_group(${PROJECT_NAME} FILES ${spng_source_files})
   add_library(${PROJECT_NAME} STATIC ${spng_source_files})
   #
-  target_compile_definitions(${PROJECT_NAME} PRIVATE SPNG_STATIC=1
-                                                     SPNG_DISABLE_OPT=1)
-  target_link_libraries(${PROJECT_NAME} PRIVATE Zlib::zlib
+  target_compile_definitions(${PROJECT_NAME} PUBLIC SPNG_STATIC=1
+                                                    SPNG_DISABLE_OPT=1)
+  target_link_libraries(${PROJECT_NAME} PUBLIC Zlib::zlib
                                         ${math_library})
   target_include_directories(${PROJECT_NAME} INTERFACE ${spng_dir})
 endmacro(Nanairo_setSpngProject)

source/nanairo/cmd/png_writer.cpp

@@ -130,14 +130,10 @@ void PngWriter::write(const LdrImage& image, std::ostream* output) const noexcep
 
   \param [in] no No description.
   */
-void PngWriter::checkError(const int no, const std::source_location location) noexcept
+void PngWriter::checkError(const int no) noexcept
 {
   if (no != SPNG_OK) {
-    std::cerr << "  PngWriter error: " << location.file_name() << "("
-                                       << location.line() << ":"
-                                       << location.column() << ") `"
-                                       << location.function_name() << "`: "
-                                       << spng_strerror(no) << std::endl;
+    std::cerr << "  PngWriter error: " << spng_strerror(no) << std::endl;
   }
 }
 

source/nanairo/cmd/png_writer.hpp

@@ -19,7 +19,6 @@
 #include <cstddef>
 #include <memory>
 #include <ostream>
-#include <source_location>
 // Zisc
 #include "zisc/memory/std_memory_resource.hpp"
 
@@ -61,8 +60,7 @@ class PngWriter
 
  private:
   //! Check if the result has any error
-  static void checkError(const int no,
-                         const std::source_location location = std::source_location::current()) noexcept;
+  static void checkError(const int no) noexcept;
 
 
   spng_ctx* context_ = nullptr;