From 8681fc060ea07f646434cd2d324e4a5aa7c495c4 Mon Sep 17 00:00:00 2001
From: myd7349 <myd7349@gmail.com>
Date: Sat, 25 Apr 2020 18:43:02 +0800
Subject: [PATCH] build: Add uchardet CLI tool building support for MSVC

---
 src/tools/CMakeLists.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/tools/CMakeLists.txt b/src/tools/CMakeLists.txt
index fa15eb2..bee2e51 100644
--- a/src/tools/CMakeLists.txt
+++ b/src/tools/CMakeLists.txt
@@ -3,6 +3,18 @@ set(
 	uchardet.cpp
 )
 
+include(CheckSymbolExists)
+
+check_symbol_exists(getopt_long "getopt.h" HAVE_GETOPT_LONG)
+
+# On Windows with MSVC, `getopt_long` is not available by default.
+# But some third-party libraries can be used. For example, in `vcpkg`,
+# we can find a port named `getopt-win32`.
+if (NOT HAVE_GETOPT_LONG)
+    find_path(GETOPT_INCLUDE_DIR NAMES getopt.h)
+    find_library(GETOPT_LIBRARY NAMES getopt)
+endif (NOT HAVE_GETOPT_LONG)
+
 set(UCHARDET_BINARY uchardet)
 
 add_executable(
@@ -10,6 +22,11 @@ add_executable(
 	${UCHARDET_SOURCES}
 )
 
+if (GETOPT_INCLUDE_DIR AND GETOPT_LIBRARY)
+    target_include_directories(${UCHARDET_BINARY} PRIVATE ${GETOPT_INCLUDE_DIR})
+    target_link_libraries(${UCHARDET_BINARY} PRIVATE ${GETOPT_LIBRARY})
+endif (GETOPT_INCLUDE_DIR AND GETOPT_LIBRARY)
+
 target_link_libraries(
 	${UCHARDET_BINARY}
 	${UCHARDET_LIBRARY}