ENH: Better linker search path computation.

  - Use linker search path -L.. -lfoo for lib w/out soname
    when platform sets CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME
  - Rename cmOrderRuntimeDirectories to cmOrderDirectories
    and generalize it for both soname constraints and link
    library constraints
  - Use cmOrderDirectories to order -L directories based
    on all needed constraints
  - Avoid processing implicit link directories
  - For CMAKE_OLD_LINK_PATHS add constraints from libs
    producing them to produce old ordering

5 files changed, 19 insertions, 1 deletions

diff --git a/Modules/Platform/FreeBSD.cmake b/Modules/Platform/FreeBSD.cmake
index 299847b..e7b26ac 100644
--- a/Modules/Platform/FreeBSD.cmake
+++ b/Modules/Platform/FreeBSD.cmake
@@ -12,6 +12,10 @@ IF(EXISTS /usr/include/dlfcn.h)
   SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 ENDIF(EXISTS /usr/include/dlfcn.h)
 
+# Shared libraries with no builtin soname may not be linked safely by
+# specifying the file path.
+SET(CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME 1)
+
 # Initialize C link type selection flags.  These flags are used when
 # building a shared library, shared module, or executable that links
 # to other libraries to select whether to use the static or shared
diff --git a/Modules/Platform/HP-UX.cmake b/Modules/Platform/HP-UX.cmake
index ae036b9..50dedc3 100644
--- a/Modules/Platform/HP-UX.cmake
+++ b/Modules/Platform/HP-UX.cmake
@@ -8,6 +8,10 @@ SET(CMAKE_FIND_LIBRARY_SUFFIXES ".sl" ".so" ".a")
 SET(CMAKE_SHARED_LIBRARY_LINK_C_WITH_RUNTIME_PATH 1)
 SET(CMAKE_LINK_DEPENDENT_LIBRARY_DIRS 1)
 
+# Shared libraries with no builtin soname may not be linked safely by
+# specifying the file path.
+SET(CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME 1)
+
 # fortran
 IF(CMAKE_COMPILER_IS_GNUG77)
   SET(CMAKE_SHARED_LIBRARY_Fortran_FLAGS "-fPIC")            # -pic 
diff --git a/Modules/Platform/Linux.cmake b/Modules/Platform/Linux.cmake
index 095eac6..eba4bb3 100644
--- a/Modules/Platform/Linux.cmake
+++ b/Modules/Platform/Linux.cmake
@@ -12,6 +12,10 @@ SET(CMAKE_SHARED_LIBRARY_SONAME_Fortran_FLAG "-Wl,-soname,")
 SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
 SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 
+# Shared libraries with no builtin soname may not be linked safely by
+# specifying the file path.
+SET(CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME 1)
+
 # Initialize C link type selection flags.  These flags are used when
 # building a shared library, shared module, or executable that links
 # to other libraries to select whether to use the static or shared
diff --git a/Modules/Platform/QNX.cmake b/Modules/Platform/QNX.cmake
index f73997a..b48383a 100644
--- a/Modules/Platform/QNX.cmake
+++ b/Modules/Platform/QNX.cmake
@@ -19,6 +19,10 @@ SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
 SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 
+# Shared libraries with no builtin soname may not be linked safely by
+# specifying the file path.
+SET(CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME 1)
+
 # Initialize C link type selection flags.  These flags are used when
 # building a shared library, shared module, or executable that links
 # to other libraries to select whether to use the static or shared
diff --git a/Modules/Platform/SunOS.cmake b/Modules/Platform/SunOS.cmake
index f6c9d2e..9bd8b09 100644
--- a/Modules/Platform/SunOS.cmake
+++ b/Modules/Platform/SunOS.cmake
@@ -103,4 +103,6 @@ ENDIF(CMAKE_COMPILER_IS_GNUCXX)
 # in the -L path.
 SET(CMAKE_LINK_DEPENDENT_LIBRARY_DIRS 1)
 
-
+# Shared libraries with no builtin soname may not be linked safely by
+# specifying the file path.
+SET(CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME 1)