When CONFIG_TRIM_UNUSED_SYSCALLS is enabled, get used syscalls from CONFIG_USED_SYSCALLS. CONFIG_USED_SYSCALLS may be a list of used syscalls or a file to store such a list. If CONFIG_USED_SYSCALLS is configured as a list of the used syscalls, directly record them in a used_syscalls variable, if it is a file to store the list, record the file name to the used_syscalls_file variable and put its content to the used_syscalls variable. Signed-off-by: Zhangjin Wu <falcon@xxxxxxxxxxx> --- scripts/Makefile.syscalls | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 scripts/Makefile.syscalls diff --git a/scripts/Makefile.syscalls b/scripts/Makefile.syscalls new file mode 100644 index 000000000000..5864d3a85996 --- /dev/null +++ b/scripts/Makefile.syscalls @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: GPL-2.0 + +ifndef SCRIPTS_MAKEFILE_SYSCALLS + SCRIPTS_MAKEFILE_SYSCALLS = 1 + + ifdef CONFIG_TRIM_UNUSED_SYSCALLS + ifneq ($(wildcard $(CONFIG_USED_SYSCALLS)),) + used_syscalls_file = $(CONFIG_USED_SYSCALLS) + ifeq ($(shell test -s $(used_syscalls_file); echo $$?),0) + used_syscalls != cat $(CONFIG_USED_SYSCALLS) + endif + else + ifeq ($(subst /,,$(CONFIG_USED_SYSCALLS)),$(CONFIG_USED_SYSCALLS)) + used_syscalls = $(CONFIG_USED_SYSCALLS) + else + $(error No such file: $(CONFIG_USED_SYSCALLS)) + endif + endif + + ifneq ($(used_syscalls),) + used_syscalls := $(subst $(space),|,$(strip $(used_syscalls))) + endif + + used_syscalls_deps = $(used_syscalls_file) $(objtree)/.config + + export used_syscalls used_syscalls_deps + endif # CONFIG_TRIM_UNUSED_SYSCALLS + +endif # SCRIPTS_MAKEFILE_SYSCALLS -- 2.25.1
