From adf8c95b62fc5ef1f608bc06dce32bb4b396828c Mon Sep 17 00:00:00 2001
From: liaogang <liaogang@baidu.com>
Date: Thu, 6 Jul 2017 15:40:22 +0800
Subject: [PATCH] FIX: propagation dependencies under linux

---
 cmake/generic.cmake | 68 ++++++++++++++++++++++++++-------------------
 1 file changed, 39 insertions(+), 29 deletions(-)

diff --git a/cmake/generic.cmake b/cmake/generic.cmake
index 87d8caaec4..3900ea2604 100644
--- a/cmake/generic.cmake
+++ b/cmake/generic.cmake
@@ -104,36 +104,32 @@ function(merge_static_libs TARGET_NAME)
     list(APPEND libs_deps ${${lib}_LIB_DEPENDS})
   endforeach()
 
-  # To produce a library we need at least one source file.
-  # It is created by add_custom_command below and will helps 
-  # also help to track dependencies.
-  set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}_dummy.c)
-
-  # Make the generated dummy source file depended on all static input
-  # libs. If input lib changes,the source file is touched
-  # which causes the desired effect (relink).
-  add_custom_command(OUTPUT ${dummyfile}
-    COMMAND ${CMAKE_COMMAND} -E touch ${dummyfile}
-    DEPENDS ${libs})
-
-  # Generate dummy staic lib
-  file(WRITE ${dummyfile} "const char * dummy = \"${dummyfile}\";")
-  add_library(${TARGET_NAME} STATIC ${dummyfile})
-  target_link_libraries(${TARGET_NAME} ${libs_deps})
+  if(APPLE) # Use OSX's libtool to merge archives
+    # To produce a library we need at least one source file.
+    # It is created by add_custom_command below and will helps 
+    # also help to track dependencies.
+    set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}_dummy.c)
 
-  foreach(lib ${libs})
-    # Get the file names of the libraries to be merged
-    set(libfiles ${libfiles} $<TARGET_FILE:${lib}>)
-  endforeach()
+    # Make the generated dummy source file depended on all static input
+    # libs. If input lib changes,the source file is touched
+    # which causes the desired effect (relink).
+    add_custom_command(OUTPUT ${dummyfile}
+      COMMAND ${CMAKE_COMMAND} -E touch ${dummyfile}
+      DEPENDS ${libs})
 
-  # Get the file name of the generated library
-  set(outlibfile "$<TARGET_FILE:${TARGET_NAME}>")
+    # Generate dummy staic lib
+    file(WRITE ${dummyfile} "const char * dummy = \"${dummyfile}\";")
+    add_library(${TARGET_NAME} STATIC ${dummyfile})
+    target_link_libraries(${TARGET_NAME} ${libs_deps})
 
-  if(APPLE) # Use OSX's libtool to merge archives
+    foreach(lib ${libs})
+      # Get the file names of the libraries to be merged
+      set(libfiles ${libfiles} $<TARGET_FILE:${lib}>)
+    endforeach()
 		add_custom_command(TARGET ${TARGET_NAME} POST_BUILD
       COMMAND rm "${CMAKE_CURRENT_BINARY_DIR}/lib${TARGET_NAME}.a"
       COMMAND /usr/bin/libtool -static -o "${CMAKE_CURRENT_BINARY_DIR}/lib${TARGET_NAME}.a" ${libfiles})
-	else() # general UNIX: use "ar" to extract objects and re-add to a common lib
+  else() # general UNIX: use "ar" to extract objects and re-add to a common lib
     foreach(lib ${libs})
       set(objlistfile ${lib}.objlist) # list of objects in the input library
       set(objdir ${lib}.objdir)
@@ -148,13 +144,27 @@ function(merge_static_libs TARGET_NAME)
         DEPENDS ${lib} ${objdir}
         WORKING_DIRECTORY ${objdir})
 
-      add_custom_command(TARGET ${TARGET_NAME} POST_BUILD
-        COMMAND ${CMAKE_AR} ru ${outlibfile} *.o 
-        WORKING_DIRECTORY ${objdir})
+      # Empty dummy source file that goes into merged library		
+      set(mergebase ${lib}.mergebase.c)		
+      add_custom_command(OUTPUT ${mergebase}		
+        COMMAND ${CMAKE_COMMAND} -E touch ${mergebase}		
+        DEPENDS ${objlistfile})		
+
+      list(APPEND mergebases "${mergebase}")
     endforeach()
 
-    add_custom_command(TARGET ${TARGET_NAME} POST_BUILD
-      COMMAND ${CMAKE_RANLIB} ${outlibfile})
+    add_library(${TARGET_NAME} STATIC ${mergebases})
+    target_link_libraries(${TARGET_NAME} ${libs_deps}) 
+
+    # Get the file name of the generated library
+    set(outlibfile "$<TARGET_FILE:${TARGET_NAME}>")
+
+    foreach(lib ${libs})
+      add_custom_command(TARGET ${TARGET_NAME} POST_BUILD
+        COMMAND ${CMAKE_AR} cr ${outlibfile} *.o  
+        COMMAND ${CMAKE_RANLIB} ${outlibfile}
+        WORKING_DIRECTORY ${lib}.objdir)
+    endforeach()
   endif()
 endfunction(merge_static_libs)
 
-- 
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