The commit 98fea8205e (Compiler/TI: Avoid response file usage for
linker, 2020-07-11, v3.19.0-rc1~495^2) disabled linker file usage by
default. The previous settings were working, even if not for all cases.
Restore them and add an explanation in a comment.
Issue: #22233
These changes are in preparation of compiler generated dependencies support
for Makefiles generators
* compiler output and dependency target can be different for Makefiles generators
* resolve inconsistency naming for dependency file place-holder
In commit a548a52230 (Compiler/TI: Refactor C/CXX to use a common file,
2020-07-11) a variable named `prefix` has been introduced.
It is set in the callers namespace because it was defined inside a
macro, not a function.
Avoid such generic variable name.
The object and library files have to be listed after the `--run-linker`
flag.
But after this flag the `--cmd_file` flag for response files cannot be
used any more.
Putting the whole command line into a response file would work, but
this is not supported by CMake (yet).
By adding the compiler flags via `<FLAGS>` to the linker call,
the linker can decide which default library to use.
CMake replaces `<FLAGS>` by the content of `CMAKE_<LANG>_FLAGS`.
So any relevant flag needs to be defined in this variable, preferably
in a toolchain file.
The compiler flags have to be specified before the `--run_linker`
flag and the linker flags afterwards.
Replaces Merge-request !4890
