Merge topic 'aix-no-rtl'

3fb3157dae AIX: Do not enable runtime linking by default anymore

Acked-by: Kitware Robot <[email protected]>
Merge-request: !3566

Help/release/dev/aix.rst

@@ -8,3 +8,13 @@ aix
   to the executable for its symbols are now linked using the import file.
   The :command:`install(TARGETS)` command now installs the import file as
   an ``ARCHIVE`` artifact.
+
+* On AIX, runtime linking is no longer enabled by default.  CMake provides
+  the linker enough information to resolve all symbols up front.
+  One may manually enable runtime linking for shared libraries and/or
+  loadable modules by adding ``-Wl,-G`` to their link flags
+  (e.g. in the :variable:`CMAKE_SHARED_LINKER_FLAGS` or
+  :variable:`CMAKE_MODULE_LINKER_FLAGS` variable).
+  One may manually enable runtime linking for executables by adding
+  ``-Wl,-brtl`` to their link flags (e.g. in the
+  :variable:`CMAKE_EXE_LINKER_FLAGS` variable).

Modules/Platform/AIX-GNU.cmake

@@ -8,16 +8,10 @@ if(__AIX_COMPILER_GNU)
 endif()
 set(__AIX_COMPILER_GNU 1)
 
-#
-# By default, runtime linking is enabled. All shared objects specified on the command line
-# will be listed, even if there are no symbols referenced, in the output file.
-string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " -Wl,-brtl")
-
-
 macro(__aix_compiler_gnu lang)
   set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG "-Wl,-blibpath:")
   set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG_SEP ":")
-  string(APPEND CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS " -Wl,-G,-bnoipath")
+  string(APPEND CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS " -Wl,-bnoipath")
   set(CMAKE_SHARED_LIBRARY_LINK_${lang}_FLAGS "-Wl,-bexpall") # CMP0065 old behavior
   set(CMAKE_${lang}_USE_IMPLICIT_LINK_DIRECTORIES_IN_RUNTIME_PATH 1)
 

Modules/Platform/AIX-XL.cmake

@@ -8,16 +8,10 @@ if(__AIX_COMPILER_XL)
 endif()
 set(__AIX_COMPILER_XL 1)
 
-#
-# By default, runtime linking is enabled. All shared objects specified on the command line
-# will be listed, even if there are no symbols referenced, in the output file.
-string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " -Wl,-brtl")
-
-
 macro(__aix_compiler_xl lang)
   set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG "-Wl,-blibpath:")
   set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG_SEP ":")
-  set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-G -Wl,-bnoipath")  # -shared
+  string(APPEND CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS " -Wl,-bnoipath")
   set(CMAKE_SHARED_LIBRARY_LINK_${lang}_FLAGS "-Wl,-bexpall") # CMP0065 old behavior
   set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS " ")
   set(CMAKE_SHARED_MODULE_${lang}_FLAGS  " ")