Add a BUILD_STATIC CMake option to optionally build a static library.

It is still ON by default, which means both shared and static libs will
be built and installed (current behavior), but it makes it possible to
disable the build of a static lib.
Closes https://github.com/BYVoid/uchardet/issues/1.

CMakeLists.txt

@@ -59,6 +59,9 @@ set (DIR_SHARE_LOCALE ${DIR_SHARE}/locale)
 
 ######## Configuration
 
+option(BUILD_STATIC "Build static library"
+       ON)
+
 configure_file(
 	uchardet.pc.in
 	uchardet.pc

src/CMakeLists.txt

@@ -51,15 +51,16 @@ add_library(
 	${UCHARDET_SOURCES}
 )
 
-add_library(
-	${UCHARDET_STATIC_TARGET}
-	STATIC
-	${UCHARDET_SOURCES}
-)
+if (BUILD_STATIC)
+    add_library(
+            ${UCHARDET_STATIC_TARGET}
+            STATIC
+            ${UCHARDET_SOURCES}
+    )
+endif (BUILD_STATIC)
 
 set_target_properties(
 	${UCHARDET_TARGET}
-	${UCHARDET_STATIC_TARGET}
 	PROPERTIES
 		LINKER_LANGUAGE
 			CXX
@@ -71,6 +72,17 @@ set_target_properties(
 			0
 )
 
+if (BUILD_STATIC)
+    set_target_properties(
+        ${UCHARDET_STATIC_TARGET}
+        PROPERTIES
+            LINKER_LANGUAGE
+                CXX
+            OUTPUT_NAME
+                uchardet
+    )
+endif (BUILD_STATIC)
+
 if (CMAKE_BUILD_TYPE MATCHES Debug)
 	add_definitions(
 		-O0
@@ -96,12 +108,14 @@ install(
 )
 endif (NOT WIN32)
 
-install(
-	TARGETS
-		${UCHARDET_STATIC_TARGET}
-	ARCHIVE DESTINATION
-		${DIR_LIBRARY_STATIC}
-)
+if (BUILD_STATIC)
+    install(
+        TARGETS
+            ${UCHARDET_STATIC_TARGET}
+        ARCHIVE DESTINATION
+            ${DIR_LIBRARY_STATIC}
+    )
+endif (BUILD_STATIC)
 
 install(
 	FILES