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tools/sched_ext: Add -fms-extensions to bpf build flags

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Similar to commit 835a507535 ("selftests/bpf: Add -fms-extensions to
bpf build flags") and commit 639f58a0f4 ("bpftool: Fix build warnings
due to MS extensions")

The kernel is now built with -fms-extensions, therefore
generated vmlinux.h contains types like:
struct aes_key {
        struct aes_enckey;
        union aes_invkey_arch inv_k;
};

struct ns_common {
	...
        union {
                struct ns_tree;
                struct callback_head ns_rcu;
        };
};

Which raise warning like below when building scx scheduler:

tools/sched_ext/build/include/vmlinux.h:50533:3: warning:
declaration does not declare anything [-Wmissing-declarations]
 50533 |                 struct ns_tree;
       |                 ^
Fix it by using -fms-extensions and -Wno-microsoft-anon-tag flags
to build bpf programs that #include "vmlinux.h"

Signed-off-by: Zhao Mengmeng <zhaomengmeng@kylinos.cn>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Zhao Mengmeng 2026-03-03 15:23:15 +08:00 • committed by Tejun Heo
parent 3f27958b72
commit 9af832c0a7
1 changed files with 2 additions and 0 deletions
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2
tools/sched_ext/Makefile
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@ -122,6 +122,8 @@ BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) \
-I../../include \
$(call get_sys_includes,$(CLANG)) \
-Wall -Wno-compare-distinct-pointer-types \
-Wno-microsoft-anon-tag \
-fms-extensions \
-O2 -mcpu=v3
# sort removes libbpf duplicates when not cross-building