4 files changed, 71 insertions, 35 deletions

diff --git a/externals/nx_tzdb/CMakeLists.txt b/externals/nx_tzdb/CMakeLists.txt
index 2f625c108..d5a1c6317 100644
--- a/externals/nx_tzdb/CMakeLists.txt
+++ b/externals/nx_tzdb/CMakeLists.txt
@@ -1,24 +1,60 @@
 # SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-set(NX_TZDB_VERSION "220816")
-set(NX_TZDB_DOWNLOAD_URL "https://github.com/lat9nq/tzdb_to_nx/releases/download/${NX_TZDB_VERSION}/${NX_TZDB_VERSION}.zip")
+set(NX_TZDB_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/include")
+
+add_library(nx_tzdb INTERFACE)
+
+find_program(GIT git)
+find_program(GNU_MAKE make)
+find_program(GNU_DATE date)
 
+set(CAN_BUILD_NX_TZDB true)
+
+if (NOT GIT)
+    set(CAN_BUILD_NX_TZDB false)
+endif()
+if (NOT GNU_MAKE)
+    set(CAN_BUILD_NX_TZDB false)
+endif()
+if (NOT GNU_DATE)
+    set(CAN_BUILD_NX_TZDB false)
+endif()
+if (CMAKE_SYSTEM_NAME STREQUAL "Windows" OR ANDROID)
+    # tzdb_to_nx currently requires a posix-compliant host
+    # MinGW and Android are handled here due to the executable format being different from the host system
+    # TODO (lat9nq): cross-compiling support
+    set(CAN_BUILD_NX_TZDB false)
+endif()
+
+set(NX_TZDB_VERSION "220816")
 set(NX_TZDB_ARCHIVE "${CMAKE_CURRENT_BINARY_DIR}/${NX_TZDB_VERSION}.zip")
-set(NX_TZDB_DIR "${CMAKE_CURRENT_BINARY_DIR}/nx_tzdb")
 
-set(NX_TZDB_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/include")
+set(NX_TZDB_ROMFS_DIR "${CMAKE_CURRENT_BINARY_DIR}/nx_tzdb")
+
+if ((NOT CAN_BUILD_NX_TZDB OR YUZU_DOWNLOAD_TIME_ZONE_DATA) AND NOT EXISTS ${NX_TZDB_ARCHIVE})
+    set(NX_TZDB_DOWNLOAD_URL "https://github.com/lat9nq/tzdb_to_nx/releases/download/${NX_TZDB_VERSION}/${NX_TZDB_VERSION}.zip")
+
+    message(STATUS "Downloading time zone data from ${NX_TZDB_DOWNLOAD_URL}...")
+    file(DOWNLOAD ${NX_TZDB_DOWNLOAD_URL} ${NX_TZDB_ARCHIVE}
+        STATUS NX_TZDB_DOWNLOAD_STATUS)
+    list(GET NX_TZDB_DOWNLOAD_STATUS 0 NX_TZDB_DOWNLOAD_STATUS_CODE)
+    if (NOT NX_TZDB_DOWNLOAD_STATUS_CODE EQUAL 0)
+        message(FATAL_ERROR "Time zone data download failed (status code ${NX_TZDB_DOWNLOAD_STATUS_CODE})")
+    endif()
 
-if (NOT EXISTS ${NX_TZDB_ARCHIVE})
-    file(DOWNLOAD ${NX_TZDB_DOWNLOAD_URL} ${NX_TZDB_ARCHIVE})
     file(ARCHIVE_EXTRACT
         INPUT
             ${NX_TZDB_ARCHIVE}
         DESTINATION
-            ${NX_TZDB_DIR})
+            ${NX_TZDB_ROMFS_DIR})
+elseif (CAN_BUILD_NX_TZDB AND NOT YUZU_DOWNLOAD_TIME_ZONE_DATA)
+    add_subdirectory(tzdb_to_nx)
+    add_dependencies(nx_tzdb x80e)
+
+    set(NX_TZDB_ROMFS_DIR "${NX_TZDB_DIR}")
 endif()
 
-add_library(nx_tzdb INTERFACE)
 target_include_directories(nx_tzdb
     INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include
     INTERFACE ${NX_TZDB_INCLUDE_DIR})
@@ -41,25 +77,25 @@ function(CreateHeader ZONE_PATH HEADER_NAME)
     target_sources(nx_tzdb PRIVATE ${HEADER_PATH})
 endfunction()
 
-CreateHeader(${NX_TZDB_DIR} base)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo zoneinfo)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Africa africa)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/America america)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/America/Argentina america_argentina)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/America/Indiana america_indiana)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/America/Kentucky america_kentucky)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/America/North_Dakota america_north_dakota)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Antartica antartica)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Arctic arctic)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Asia asia)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Atlantic atlantic)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Australia australia)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Brazil brazil)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Canada canada)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Chile chile)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Etc etc)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Europe europe)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Indian indian)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Mexico mexico)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/Pacific pacific)
-CreateHeader(${NX_TZDB_DIR}/zoneinfo/US us)
+CreateHeader(${NX_TZDB_ROMFS_DIR} base)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo zoneinfo)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Africa africa)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/America america)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/America/Argentina america_argentina)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/America/Indiana america_indiana)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/America/Kentucky america_kentucky)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/America/North_Dakota america_north_dakota)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Antarctica antarctica)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Arctic arctic)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Asia asia)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Atlantic atlantic)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Australia australia)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Brazil brazil)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Canada canada)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Chile chile)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Etc etc)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Europe europe)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Indian indian)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Mexico mexico)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/Pacific pacific)
+CreateHeader(${NX_TZDB_ROMFS_DIR}/zoneinfo/US us)
diff --git a/externals/nx_tzdb/NxTzdbCreateHeader.cmake b/externals/nx_tzdb/NxTzdbCreateHeader.cmake
index 69166aa5b..8c29e1167 100644
--- a/externals/nx_tzdb/NxTzdbCreateHeader.cmake
+++ b/externals/nx_tzdb/NxTzdbCreateHeader.cmake
@@ -15,7 +15,7 @@ set(DIRECTORY_NAME ${HEADER_NAME})
 
 set(FILE_DATA "")
 foreach(ZONE_FILE ${FILE_LIST})
-    if ("${ZONE_FILE}" STREQUAL "\n")
+    if (ZONE_FILE STREQUAL "\n")
         continue()
     endif()
 
@@ -26,13 +26,13 @@ foreach(ZONE_FILE ${FILE_LIST})
     foreach(I RANGE 0 ${ZONE_DATA_LEN} 2)
         math(EXPR BREAK_LINE "(${I} + 2) % 38")
 
-        string(SUBSTRING "${ZONE_DATA}" "${I}" "2" HEX_DATA)
-        if ("${HEX_DATA}" STREQUAL "")
+        string(SUBSTRING "${ZONE_DATA}" "${I}" 2 HEX_DATA)
+        if (NOT HEX_DATA)
             break()
         endif()
 
         string(APPEND FILE_DATA "0x${HEX_DATA},")
-        if ("${BREAK_LINE}" STREQUAL "0")
+        if (BREAK_LINE EQUAL 0)
             string(APPEND FILE_DATA "\n")
         else()
             string(APPEND FILE_DATA " ")
diff --git a/externals/nx_tzdb/include/nx_tzdb.h b/externals/nx_tzdb/include/nx_tzdb.h
index d7b1e4304..1f7c6069a 100644
--- a/externals/nx_tzdb/include/nx_tzdb.h
+++ b/externals/nx_tzdb/include/nx_tzdb.h
@@ -9,7 +9,7 @@
 #include "nx_tzdb/america_indiana.h"
 #include "nx_tzdb/america_kentucky.h"
 #include "nx_tzdb/america_north_dakota.h"
-#include "nx_tzdb/antartica.h"
+#include "nx_tzdb/antarctica.h"
 #include "nx_tzdb/arctic.h"
 #include "nx_tzdb/asia.h"
 #include "nx_tzdb/atlantic.h"
diff --git a/externals/nx_tzdb/tzdb_to_nx b/externals/nx_tzdb/tzdb_to_nx
new file mode 160000
+Subproject 34df65eff295c2bd9ee9e6a077d662486d5cabb