1# SPDX-License-Identifier: Apache-2.0
2
3# Purpose of the generic.cmake is to define a generic C compiler which can be
4# used for devicetree pre-processing and other pre-processing tasks which must
5# be performed before the target can be determined.
6
7# Todo: deprecate CLANG_ROOT_DIR
8set_ifndef(LLVM_TOOLCHAIN_PATH "$ENV{CLANG_ROOT_DIR}")
9zephyr_get(LLVM_TOOLCHAIN_PATH)
10
11if(LLVM_TOOLCHAIN_PATH)
12  set(TOOLCHAIN_HOME ${LLVM_TOOLCHAIN_PATH}/bin/)
13endif()
14
15set(LLVM_TOOLCHAIN_PATH ${CLANG_ROOT_DIR} CACHE PATH "clang install directory")
16
17set(COMPILER clang)
18set(BINTOOLS llvm)
19
20# LLVM is flexible, meaning that it can in principle always support newlib or picolibc.
21# This is not decided by LLVM itself, but depends on libraries distributed with  the installation.
22# Also newlib or picolibc may be created as add-ons. Thus always stating that LLVM does not have
23# newlib or picolibc would be wrong. Same with stating that LLVM has newlib or Picolibc.
24# The best assumption for TOOLCHAIN_HAS_<NEWLIB|PICOLIBC> is to check for the  presence of
25# '_newlib_version.h' / 'picolibc' and have the default value set accordingly.
26# This provides a best effort mechanism to allow developers to have the newlib C / Picolibc library
27# selection available in Kconfig.
28# Developers can manually indicate library support with '-DTOOLCHAIN_HAS_<NEWLIB|PICOLIBC>=<ON|OFF>'
29
30# Support for newlib is indicated by the presence of '_newlib_version.h' in the toolchain path.
31if(NOT LLVM_TOOLCHAIN_PATH STREQUAL "")
32  file(GLOB_RECURSE newlib_header ${LLVM_TOOLCHAIN_PATH}/_newlib_version.h)
33  if(newlib_header)
34    set(TOOLCHAIN_HAS_NEWLIB ON CACHE BOOL "True if toolchain supports newlib")
35  endif()
36
37  # Support for picolibc is indicated by the presence of 'picolibc.h' in the toolchain path.
38  file(GLOB_RECURSE picolibc_header ${LLVM_TOOLCHAIN_PATH}/picolibc.h)
39  if(picolibc_header)
40    set(TOOLCHAIN_HAS_PICOLIBC ON CACHE BOOL "True if toolchain supports picolibc")
41  endif()
42endif()
43
44message(STATUS "Found toolchain: llvm (clang/ld)")
45