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cmake: Add option for exporting build metadata to Make

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Add an opt-in feature that will generate a Makefile with build
variables like CC, and KBUILD_CFLAGS for consumption by third-party
Make-based build systems.

This emulates the 'outputexports' target that KBuild supported and is
supported for the same reasons that KBuild supported it. Easier
integration with third-party build systems.

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
This commit is contained in:
Sebastian Bøe 2019-10-17 14:25:34 +02:00 committed by Anas Nashif
parent c9171be27e
commit d3a8fd40b9
3 changed files with 40 additions and 0 deletions
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5
CMakeLists.txt
View file

@ -1503,6 +1503,11 @@ add_subdirectory(cmake/flash)
add_subdirectory(cmake/usage) add_subdirectory(cmake/usage)
add_subdirectory(cmake/reports) add_subdirectory(cmake/reports)
add_subdirectory_ifdef(
CONFIG_MAKEFILE_EXPORTS
cmake/makefile_exports
)
if(NOT CONFIG_TEST) if(NOT CONFIG_TEST)
if(CONFIG_ASSERT AND (NOT CONFIG_FORCE_NO_ASSERT)) if(CONFIG_ASSERT AND (NOT CONFIG_FORCE_NO_ASSERT))
message(WARNING "__ASSERT() statements are globally ENABLED") message(WARNING "__ASSERT() statements are globally ENABLED")

6
Kconfig.zephyr
View file

@ -354,6 +354,12 @@ config APPLICATION_DEFINED_SYSCALL
Scan additional folders inside application source folder Scan additional folders inside application source folder
for application defined syscalls. for application defined syscalls.
config MAKEFILE_EXPORTS
bool "Generate build metadata files named Makefile.exports"
help
Generates a file with build information that can be read by
third party Makefile-based build systems.
endmenu endmenu
endmenu endmenu

29
cmake/makefile_exports/CMakeLists.txt Normal file
View file

@ -0,0 +1,29 @@
# Copyright (c) 2020 Nordic Semiconductor ASA
# SPDX-License-Identifier: Apache-2.0
set(exports
"
CC = ${CMAKE_C_COMPILER}
CXX = ${CMAKE_CXX_COMPILER}
OBJCOPY = ${CMAKE_OBJCOPY}
OBJDUMP = ${CMAKE_OBJDUMP}
AS = ${CMAKE_AS}
AR = ${CMAKE_AR}
NM = ${CMAKE_NM}
GDB = ${CMAKE_GDB}
Z_CFLAGS = -I$<JOIN:$<TARGET_PROPERTY:zephyr_interface,INTERFACE_INCLUDE_DIRECTORIES>, -I> -isystem $<JOIN:$<TARGET_PROPERTY:zephyr_interface,INTERFACE_SYSTEM_INCLUDE_DIRECTORIES>, -isystem > -D$<JOIN:$<TARGET_PROPERTY:zephyr_interface,INTERFACE_COMPILE_DEFINITIONS>, -D> $<JOIN:$<TARGET_PROPERTY:zephyr_interface,INTERFACE_COMPILE_OPTIONS>, >
"
)
# file(GENERATE writes a file at Generation time. Also, it writes one
# file per detected configuration, in this case, each COMPILE_LANGUAGE
# is a new configuration.
#
# We use 'file(GENERATE' instead of configure_file because we want to
# generate the file after Configure-time to have all the
# metadata. Also, we don't use 'add_custom_command' because it cannot
# read the generator expressions that we use.
file(GENERATE
OUTPUT ${CMAKE_BINARY_DIR}/Makefile.exports.$<COMPILE_LANGUAGE>
CONTENT "${exports}"
)