It's for conditonal variable and macro to enable nolibc build. Also add `--nolibc` option to `configure` to enable it. Link: https://github.com/axboe/liburing/issues/443 Reviewed-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Ammar Faizi <ammar.faizi@xxxxxxxxxxxxxxxxxxxxx> --- configure | 9 +++++++++ src/Makefile | 17 ++++++++++++++++- 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/configure b/configure index 92f51bd..d2866b3 100755 --- a/configure +++ b/configure @@ -24,6 +24,8 @@ for opt do ;; --cxx=*) cxx="$optarg" ;; + --nolibc) liburing_nolibc="yes" + ;; *) echo "ERROR: unknown option $opt" echo "Try '$0 --help' for more information" @@ -71,6 +73,7 @@ Options: [defaults in brackets after descriptions] --datadir=PATH install shared data in PATH [$datadir] --cc=CMD use CMD as the C compiler --cxx=CMD use CMD as the C++ compiler + --nolibc build liburing without libc EOF exit 0 fi @@ -358,6 +361,12 @@ print_config "has_memfd_create" "$has_memfd_create" ############################################################################# +if test "$liburing_nolibc" = "yes"; then + output_sym "CONFIG_NOLIBC" +else + liburing_nolibc="no" +fi +print_config "liburing_nolibc" "$liburing_nolibc" if test "$__kernel_rwf_t" = "yes"; then output_sym "CONFIG_HAVE_KERNEL_RWF_T" diff --git a/src/Makefile b/src/Makefile index 5e46a9d..09ff395 100644 --- a/src/Makefile +++ b/src/Makefile @@ -32,11 +32,22 @@ endif all: $(all_targets) -liburing_srcs := setup.c queue.c syscall.c register.c +liburing_srcs := setup.c queue.c register.c + +ifeq ($(CONFIG_NOLIBC),y) + liburing_srcs += nolibc.c + override CFLAGS += -nostdlib -nodefaultlibs -ffreestanding -fno-stack-protector + override CPPFLAGS += -nostdlib -nodefaultlibs -ffreestanding -fno-stack-protector + override LINK_FLAGS += -nostdlib -nodefaultlibs +else + liburing_srcs += syscall.c +endif liburing_objs := $(patsubst %.c,%.ol,$(liburing_srcs)) liburing_sobjs := $(patsubst %.c,%.os,$(liburing_srcs)) +$(liburing_srcs): syscall.h lib.h + $(liburing_objs) $(liburing_sobjs): include/liburing/io_uring.h %.os: %.c @@ -73,3 +84,7 @@ clean: @rm -f $(all_targets) $(liburing_objs) $(liburing_sobjs) $(soname).new @rm -f *.so* *.a *.o @rm -f include/liburing/compat.h + + @# When cleaning, we don't include ../config-host.mak, + @# so the nolibc objects are always skipped, clean them up! + @rm -f nolibc.ol nolibc.os -- 2.30.2
