Add an option to build an import .lib with dlltool on mingw

Also make sure the ordinals are stripped from the .def file (using sed), so
that the generated .lib will link apps to the DLL using function names instead
of ordinals.

1 files changed, 48 insertions, 22 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0be1126c..b646509f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,12 +26,41 @@ include(CheckFileOffsetBits)
 SET(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS TRUE)
 
 
+OPTION(ALSOFT_DLOPEN  "Check for the dlopen API for loading optional libs"  ON)
+
+OPTION(ALSOFT_WERROR  "Treat compile warnings as errors"      OFF)
+
+OPTION(ALSOFT_UTILS          "Build and install utility programs"         ON)
+OPTION(ALSOFT_NO_CONFIG_UTIL "Disable building the alsoft-config utility" OFF)
+
+OPTION(ALSOFT_EXAMPLES  "Build and install example programs"  ON)
+
+OPTION(ALSOFT_CONFIG "Install alsoft.conf sample configuration file" ON)
+OPTION(ALSOFT_HRTF_DEFS "Install HRTF definition files" ON)
+
+
 IF(WIN32)
+    SET(LIBNAME OpenAL32)
+    ADD_DEFINITIONS("-D_WIN32 -D_WIN32_WINNT=0x0502")
+
     # This option is mainly for static linking OpenAL Soft into another project
     # that already defines the IDs. It is up to that project to ensure all
     # required IDs are defined.
     OPTION(ALSOFT_NO_UID_DEFS "Do not define GUIDs, IIDs, CLSIDs, or PropertyKeys" OFF)
+
+    IF(MINGW)
+        OPTION(ALSOFT_BUILD_IMPORT_LIB "Build an import .lib using dlltool (requires sed)" ON)
+        IF(NOT DLLTOOL)
+            IF(HOST)
+                SET(DLLTOOL "${HOST}-dlltool")
+            ELSE()
+                SET(DLLTOOL "dlltool")
+            ENDIF()
+        ENDIF()
+    ENDIF()
 ELSE()
+    SET(LIBNAME openal)
+
     # These are needed on non-Windows systems for extra features
     ADD_DEFINITIONS(-D_GNU_SOURCE=1 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700)
     SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_GNU_SOURCE=1 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700")
@@ -47,26 +76,6 @@ ADD_DEFINITIONS(-D_LARGEFILE_SOURCE -D_LARGE_FILES)
 SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_LARGEFILE_SOURCE -D_LARGE_FILES")
 
 
-OPTION(ALSOFT_DLOPEN  "Check for the dlopen API for loading optional libs"  ON)
-
-OPTION(ALSOFT_WERROR  "Treat compile warnings as errors"      OFF)
-
-OPTION(ALSOFT_UTILS          "Build and install utility programs"         ON)
-OPTION(ALSOFT_NO_CONFIG_UTIL "Disable building the alsoft-config utility" OFF)
-
-OPTION(ALSOFT_EXAMPLES  "Build and install example programs"  ON)
-
-OPTION(ALSOFT_CONFIG "Install alsoft.conf sample configuration file" ON)
-OPTION(ALSOFT_HRTF_DEFS "Install HRTF definition files" ON)
-
-
-IF(WIN32)
-    SET(LIBNAME OpenAL32)
-    ADD_DEFINITIONS("-D_WIN32 -D_WIN32_WINNT=0x0502")
-ELSE()
-    SET(LIBNAME openal)
-ENDIF()
-
 # QNX's gcc do not uses /usr/include and /usr/lib pathes by default
 IF ("${CMAKE_C_PLATFORM_ID}" STREQUAL "QNX")
     ADD_DEFINITIONS("-I/usr/include")
@@ -1040,8 +1049,25 @@ SET_TARGET_PROPERTIES(${LIBNAME} PROPERTIES VERSION ${LIB_VERSION}
 IF(WIN32 AND NOT LIBTYPE STREQUAL "STATIC")
     SET_TARGET_PROPERTIES(${LIBNAME} PROPERTIES PREFIX "")
 ENDIF()
-IF(MINGW)
-    SET_TARGET_PROPERTIES(${LIBNAME} PROPERTIES LINK_FLAGS "-Wl,--output-def,${LIBNAME}.def")
+IF(MINGW AND ALSOFT_BUILD_IMPORT_LIB)
+    FIND_PROGRAM(SED_EXECUTABLE NAMES sed DOC "sed executable")
+    FIND_PROGRAM(DLLTOOL_EXECUTABLE NAMES "${DLLTOOL}" DOC "dlltool executable")
+    IF(NOT SED_EXECUTABLE OR NOT DLLTOOL_EXECUTABLE)
+        MESSAGE(STATUS "")
+        IF(NOT SED_EXECUTABLE)
+            MESSAGE(STATUS "WARNING: Cannot find sed, disabling .def/.lib generation")
+        ENDIF()
+        IF(NOT DLLTOOL_EXECUTABLE)
+            MESSAGE(STATUS "WARNING: Cannot find dlltool, disabling .def/.lib generation")
+        ENDIF()
+    ELSE()
+        SET_TARGET_PROPERTIES(${LIBNAME} PROPERTIES LINK_FLAGS "-Wl,--output-def,${LIBNAME}.def")
+        ADD_CUSTOM_COMMAND(TARGET ${LIBNAME} POST_BUILD
+                           COMMAND "${SED_EXECUTABLE}" -i -e "s/ @[^ ]*//" ${LIBNAME}.def
+                           COMMAND "${DLLTOOL_EXECUTABLE}" -d ${LIBNAME}.def -l ${LIBNAME}.lib -D ${LIBNAME}.dll
+                           COMMENT "Stripping ordinals from ${LIBNAME}.def and generating ${LIBNAME}.lib..."
+                           VERBATIM)
+    ENDIF()
 ENDIF()
 
 TARGET_LINK_LIBRARIES(${LIBNAME} common ${EXTRA_LIBS})