[libspng] Install pkg-config on Windows (#53510)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

ports/libspng/libspng-pr-286.diff

@@ -0,0 +1,60 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index da1917e..d385e46 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -17,10 +17,13 @@ option(BUILD_EXAMPLES "Build examples" ON)
+ include(GNUInstallDirs)
+ include(CMakePackageConfigHelpers)
+ 
+-if(NOT CMAKE_HOST_WIN32)
++find_library(MATH_LIBRARY_PATH NAMES m PATHS ${CMAKE_C_IMPLICIT_LINK_DIRECTORIES})
++if(MATH_LIBRARY_PATH)
+     set(MATH_LIBRARY "m")
++    set(LIBS "-lm")
+ else()
+     set(MATH_LIBRARY "")
++    set(LIBS "")
+ endif()
+ 
+ if(NOT ENABLE_OPT)
+@@ -93,16 +96,13 @@ install(
+   DESTINATION ${config_install_dir}
+ )
+ 
+-if(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
+-    set(prefix      ${CMAKE_INSTALL_PREFIX})
+-    set(exec_prefix ${CMAKE_INSTALL_PREFIX})
+-    set(libdir      ${CMAKE_INSTALL_FULL_LIBDIR})
+-    set(includedir  ${CMAKE_INSTALL_FULL_INCLUDEDIR})
+-    set(LIBS        "-lm")
++set(prefix      ${CMAKE_INSTALL_PREFIX})
++set(exec_prefix ${CMAKE_INSTALL_PREFIX})
++set(libdir      ${CMAKE_INSTALL_FULL_LIBDIR})
++set(includedir  ${CMAKE_INSTALL_FULL_INCLUDEDIR})
+ 
+-    foreach(libname ${spng_TARGETS})
+-        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/libspng.pc.in ${CMAKE_CURRENT_BINARY_DIR}/cmake/lib${libname}.pc @ONLY)
++foreach(libname ${spng_TARGETS})
++    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/spng.pc.in ${CMAKE_CURRENT_BINARY_DIR}/cmake/${libname}.pc @ONLY)
+ 
+-        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/cmake/lib${libname}.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+-    endforeach()
+-endif()
++    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/cmake/${libname}.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
++endforeach()
+diff --git a/cmake/libspng.pc.in b/cmake/spng.pc.in
+similarity index 92%
+rename from cmake/libspng.pc.in
+rename to cmake/spng.pc.in
+index 71e0e47..1904c09 100644
+--- a/cmake/libspng.pc.in
++++ b/cmake/spng.pc.in
+@@ -3,7 +3,7 @@ exec_prefix=@exec_prefix@
+ libdir=@libdir@
+ includedir=@includedir@/
+ 
+-Name: lib@libname@
++Name: @libname@
+ Description: PNG decoding and encoding library
+ Version: @SPNG_VERSION@
+ Requires: zlib

ports/libspng/portfile.cmake

@@ -5,7 +5,8 @@ vcpkg_from_github(
     SHA512 cd729653599ed97f80d19f3048c1b3bc2ac16f922b3465804b1913bc45d9fc8b28b56bc2121fda36e9d3dcdd12612cced5383313b722a5342b613f8781879f1a
     HEAD_REF master
     PATCHES
-        fix-spngconfig-cmake.patch
+        fix-spngconfig-cmake.patch # https://github.com/randy408/libspng/pull/262/
+        libspng-pr-286.diff # https://github.com/randy408/libspng/pull/286/
 )
 
 string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "static" SPNG_BUILD_STATIC)
@@ -26,8 +27,30 @@ vcpkg_cmake_config_fixup(CONFIG_PATH lib/cmake/spng PACKAGE_NAME spng)
 file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include")
 
 vcpkg_copy_pdbs()
+
+if (VCPKG_LIBRARY_LINKAGE STREQUAL "static")
+    vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/include/spng.h" "#define SPNG_H" "#define SPNG_H\n#define SPNG_STATIC")
+    vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/lib/pkgconfig/spng_static.pc" "Name: spng_static" "Name: spng")
+    file(REMOVE "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/spng.pc")
+    file(RENAME "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/spng_static.pc" "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/spng.pc")
+    if (NOT VCPKG_BUILD_TYPE)
+        vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/spng_static.pc" "Name: spng_static" "Name: spng")
+        file(REMOVE "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/spng.pc")
+        file(RENAME "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/spng_static.pc" "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/spng.pc")
+    endif()
+else()
+    file(REMOVE "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/spng_static.pc")
+    if (NOT VCPKG_BUILD_TYPE)
+        file(REMOVE "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/spng_static.pc")
+    endif()
+endif()
+
 vcpkg_fixup_pkgconfig()
 
-file(INSTALL "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")
+file(COPY "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")
 
-vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/LICENSE")
+vcpkg_install_copyright(
+    FILE_LIST
+        "${SOURCE_PATH}/LICENSE"
+        "${SOURCE_PATH}/spng/spng.c"
+)

ports/libspng/usage

@@ -1,4 +1,9 @@
 libspng provides CMake targets:
 
     find_package(SPNG CONFIG REQUIRED)
-    target_link_libraries(main PRIVATE $<IF:$<TARGET_EXISTS:spng::spng>,spng::spng,spng::spng_static>) 
+    target_link_libraries(main PRIVATE $<IF:$<TARGET_EXISTS:spng::spng>,spng::spng,spng::spng_static>)
+
+libspng provides pkg-config modules:
+
+    # PNG decoding and encoding library
+    spng

ports/libspng/vcpkg.json

@@ -1,9 +1,10 @@
 {
   "name": "libspng",
   "version": "0.7.4",
+  "port-version": 1,
   "description": "Simple, modern libpng alternative",
   "homepage": "https://github.com/randy408/libspng",
-  "license": "BSD-2-Clause",
+  "license": "BSD-2-Clause AND libpng-2.0",
   "dependencies": [
     {
       "name": "vcpkg-cmake",

versions/baseline.json

@@ -5746,7 +5746,7 @@
     },
     "libspng": {
       "baseline": "0.7.4",
-      "port-version": 0
+      "port-version": 1
     },
     "libsquish": {
       "baseline": "1.15",

versions/l-/libspng.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "c18b7942b3efca64c49cf7598a0099db296728d4",
+      "version": "0.7.4",
+      "port-version": 1
+    },
     {
       "git-tree": "ed674df56d8b39d76443c7db3ae893c08394bf9c",
       "version": "0.7.4",