fix MC on 32bits about libunwind

[simgrid.git] / tools / cmake / Modules / FindLibunwind.cmake

diff --git a/tools/cmake/Modules/FindLibunwind.cmake b/tools/cmake/Modules/FindLibunwind.cmake
index 67bcde6..1a2dd83 100644 (file)
--- a/tools/cmake/Modules/FindLibunwind.cmake
+++ b/tools/cmake/Modules/FindLibunwind.cmake
@@ -1,3 +1,5 @@
+message(STATUS "Looking for libunwind")
+
 if(PROCESSOR_x86_64)
   find_library(PATH_LIBUNWIND_LIB
     NAMES unwind-x86_64
@@ -12,23 +14,38 @@ if(PROCESSOR_x86_64)
     /opt/csw
     /sw
     /usr)
+  message(STATUS "Looking for libunwind-x86_64 - found")
 endif()
 
 if(NOT PATH_LIBUNWIND_LIB)
   find_library(PATH_LIBUNWIND_LIB
     NAMES unwind
     HINTS
-    $ENV{SIMGRID_LIBUNWIND_LIBRARY_PATH}
-    $ENV{LD_LIBRARY_PATH}
-    $ENV{LIBUNWIND_LIBRARY_PATH}
-    PATH_SUFFIXES lib/ GnuWin32/lib lib/system
-    PATHS
-    /opt
-    /opt/local
-    /opt/csw
-    /sw
-    /usr
-    /usr/lib/)
+      $ENV{SIMGRID_LIBUNWIND_LIBRARY_PATH}
+      $ENV{LD_LIBRARY_PATH}
+      $ENV{LIBUNWIND_LIBRARY_PATH}
+      PATH_SUFFIXES lib/ GnuWin32/lib lib/system
+      PATHS
+      /opt
+      /opt/local
+      /opt/csw
+      /sw
+      /usr
+      /usr/lib/)
+      
+  # Mac OSX has a libunwind that is not the one we need, so double check
+  if (PATH_LIBUNWIND_LIB)
+    message(STATUS "Looking for libunwind - found")
+    CHECK_LIBRARY_EXISTS(unwind unw_init_local "${PATH_LIBUNWIND_LIB}" RIGHT_LIBUNWIND)
+    if (NOT RIGHT_LIBUNWIND)
+      message(STATUS "libunwind in ${PATH_LIBUNWIND_LIB} is unusable. Disable it.")
+      set(PATH_LIBUNWIND_LIB 0)
+    endif()
+    
+  else()
+    message(STATUS "Looking for libunwind - not found")
+  endif()
+
 endif()
 
 find_path(PATH_LIBUNWIND_H "libunwind.h"
@@ -51,13 +68,6 @@ else()
   message(STATUS "Looking for libunwind.h - not found")
 endif()
 
-message(STATUS "Looking for libunwind")
-if(PATH_LIBUNWIND_LIB)
-  message(STATUS "Looking for libunwind - found")
-else()
-  message(STATUS "Looking for libunwind - not found")
-endif()
-
 if(PATH_LIBUNWIND_LIB AND PATH_LIBUNWIND_H)
   string(REGEX REPLACE "/libunwind.*[.]${LIB_EXE}$" "" PATH_LIBUNWIND_LIB "${PATH_LIBUNWIND_LIB}")
   string(REGEX REPLACE "/libunwind.h"               "" PATH_LIBUNWIND_H   "${PATH_LIBUNWIND_H}")