diff options
| author | Siva Chandra Reddy <sivachandra@google.com> | 2023-08-29 07:32:52 +0000 |
|---|---|---|
| committer | Siva Chandra Reddy <sivachandra@google.com> | 2023-09-05 14:19:18 +0000 |
| commit | 0f1507af411b08c66e9807684858893f2e921ee2 (patch) | |
| tree | ff91f4df5e9849b0cb6e9e72e0a72b0a172d8744 /libc/CMakeLists.txt | |
| parent | 5647f2908de90fe07b0805e988cd2e91a1751928 (diff) | |
| download | llvm-0f1507af411b08c66e9807684858893f2e921ee2.zip llvm-0f1507af411b08c66e9807684858893f2e921ee2.tar.gz llvm-0f1507af411b08c66e9807684858893f2e921ee2.tar.bz2 | |
[libc] Add a JSON based config option system.
Few printf config options have been setup using this new config system
along with their baremetal overrides. A follow up patch will add generation
of doc/config.rst, which will contain the full list of libc config options
and short description explaining how they affect the libc.
Reviewed By: gchatelet
Differential Revision: https://reviews.llvm.org/D159158
Diffstat (limited to 'libc/CMakeLists.txt')
| -rw-r--r-- | libc/CMakeLists.txt | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt index c885080..549d1fb 100644 --- a/libc/CMakeLists.txt +++ b/libc/CMakeLists.txt @@ -93,6 +93,46 @@ set(LIBC_ENABLE_HERMETIC_TESTS ${LLVM_LIBC_FULL_BUILD}) # Defines LIBC_TARGET_ARCHITECTURE and associated macros. include(LLVMLibCArchitectures) +include(LibcConfig) +# Config loading happens in three steps: +# 1. Load the config file config/config.json and set up config vars. +# 2. Load config/${LIBC_TARGET_OS}/config.json if available and override +# vars as suitable. +# 3. Load config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCH}/config.json is +# available and override vars as suitable. +# All the three steps will not override options already set from the +# CMake command line. That is, the CMake command line option values take +# precedence over the values in config.json files. +set(main_config_file ${LIBC_SOURCE_DIR}/config/config.json) +read_libc_config(${main_config_file} global_config) +foreach(opt IN LISTS global_config) + string(JSON opt_name ERROR_VARIABLE json_error MEMBER ${opt} 0) + if(json_error) + message(FATAL_ERROR ${json_error}) + endif() + if(DEFINED ${opt_name}) + # The option is already defined from the command line so we ignore it here. + # We still make note of it so that further config load can also ignore + # this option. + message(STATUS "${opt_name}: ${${opt_name}} (from command line)") + list(APPEND cmd_line_conf ${opt_name}) + continue() + endif() + + string(JSON opt_object ERROR_VARIABLE json_error GET ${opt} ${opt_name}) + if(json_error) + message(FATAL_ERROR "Error reading info of option '${opt_name}': ${json_error}") + endif() + string(JSON opt_value ERROR_VARIABLE json_error GET ${opt_object} "value") + if(json_error) + message(FATAL_ERROR ${json_error}) + endif() + message(STATUS "${opt_name}: ${opt_value}") + set(${opt_name} ${opt_value}) +endforeach() +load_libc_config(${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/config.json ${cmd_line_conf}) +load_libc_config(${LIBC_SOURCE_DIR}/config/${LIBC_TARGET_OS}/${LIBC_TARGET_ARCHITECTURE}/config.json ${cmd_line_conf}) + if(LIBC_TARGET_ARCHITECTURE_IS_GPU) set(LIBC_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/include) set(LIBC_INSTALL_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR}/gpu-none-llvm) |