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Martin Storsjö 93010544a8 [CMake] Don't pass CMAKE_C(XX)_COMPILER to the nested NATIVE build when cross compiling 
Originally, the nested build was set up with the CMake command
`execute_process` which implicitly passes CC/CXX variables for
the configured compiler, which then was picked up by the nested
CMake. (This CMake behaviour, to implicitly pass such variables
is up for discussion and might change in the future; see
https://gitlab.kitware.com/cmake/cmake/-/issues/21378.)

How the nested cmake build is set up was changed in
aa7d6db5c8 / D40229 - the old behaviour
was brought along by manually passing
-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER} to the nested cmake
configuration. This was then later made optional in
f5f0fffea5 / D40947. But still,
the default if the user doesn't pass
CROSS_TOOLCHAIN_FLAGS_${target_name} (e.g. CROSS_TOOLCHAIN_FLAGS_NATIVE)
is to pass in the surrounding build's compiler - which usually
doesn't work, and is quite non-obvious to figure out.

Just drop the default passing of the outer compiler, when cross
compiling. This should avoid surprising cases of using the cross
compiler for the native build for essentially all new users trying
to cross compile, until they've discovered CROSS_TOOLCHAIN_FLAGS_NATIVE.

Keep passing these when not cross compiling, e.g. if building with
optimized tablegen.

This was already suggested at the end in D40229, but apparently never
acted upon.

Differential Revision: https://reviews.llvm.org/D126313
 		2022-06-22 09:33:50 +03:00
..
modules [CMake] Don't pass CMAKE_C(XX)_COMPILER to the nested NATIVE build when cross compiling 2022-06-22 09:33:50 +03:00
platforms [cmake] Use CMAKE_TRY_COMPILE_PLATFORM_VARIABLES 2022-03-08 15:25:03 -08:00
README
…
config-ix.cmake [config] Remove RETSIGTYPE from config.h.cmake, NFC 2022-06-07 11:35:25 -07:00
config.guess [PowerPC] Add the LLVM triple for powerpcle [1/5] 2021-01-02 12:17:22 -06:00
dummy.cpp
…
nsis_icon.ico
…
nsis_logo.bmp
…
unwind.h [ExecutionEngine] Check for libunwind before calling __register_frame 2021-08-15 13:35:53 +01:00

README 

See docs/CMake.html for instructions on how to build LLVM with CMake.