The CMAKE_SHARED_LIBRARY_LINK_<LANG>_FLAGS setting has always been meant
for flags needed to export symbols from executables for use by shared
library plugins. Since commit v3.4.0-rc1~58^2~1 (CMP0065: Restrict the
use of CMAKE_SHARED_LIBRARY_LINK_<LANG>_FLAGS, 2015-08-24) this is made
explicit by using the flags only for executables with ENABLE_EXPORTS,
guarded by CMP0065 for compatibility.
On some platforms we were accidentally using this setting to pass other
flags to the linker:
* AIX: -bnoipath, -brtl
* HP-UX: +s, +nodefaultrpath
These flags are incorrectly dropped when CMP0065 is set to NEW. Fix
this by moving the flags to more appropriate places for linking
executables.
This moves GNU compiler flags into new-style modules
Compiler/GNU-<lang>.cmake
Platform/<os>-GNU-<lang>.cmake
We use language-independent helper modules
Compiler/GNU.cmake
Platform/<os>-GNU.cmake
to define macros consolidating the information.
Marc Chevrier
Todd Gamblin
Brad King