[PATCH 5.8 080/148] tools/bpftool: Make skeleton code C++17-friendly by dropping typeof()

Greg Kroah-Hartman
2020-08-24T09:57:11Z

From: Andrii Nakryiko <andriin@fb.com>

[ Upstream commit 8faf7fc597d59b142af41ddd4a2d59485f75f88a ]

Seems like C++17 standard mode doesn't recognize typeof() anymore. This can
be tested by compiling test_cpp test with -std=c++17 or -std=c++1z options.
The use of typeof in skeleton generated code is unnecessary, all types are
well-known at the time of code generation, so remove all typeof()'s to make
skeleton code more future-proof when interacting with C++ compilers.

Fixes: 985ead416df3 ("bpftool: Add skeleton codegen command")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200812025907.1371956-1-andriin@fb.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/bpf/bpftool/gen.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index 540ffde0b03a3..0be1330b4c1ba 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -400,7 +400,7 @@ static int do_skeleton(int argc, char **argv)
{ \n\
struct %1$s *obj; \n\
\n\
- obj = (typeof(obj))calloc(1, sizeof(*obj)); \n\
+ obj = (struct %1$s *)calloc(1, sizeof(*obj)); \n\
if (!obj) \n\
return NULL; \n\
if (%1$s__create_skeleton(obj)) \n\
@@ -464,7 +464,7 @@ static int do_skeleton(int argc, char **argv)
{ \n\
struct bpf_object_skeleton *s; \n\
\n\
- s = (typeof(s))calloc(1, sizeof(*s)); \n\
+ s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));\n\
if (!s) \n\
return -1; \n\
obj->skeleton = s; \n\
@@ -482,7 +482,7 @@ static int do_skeleton(int argc, char **argv)
/* maps */ \n\
s->map_cnt = %zu; \n\
s->map_skel_sz = sizeof(*s->maps); \n\
- s->maps = (typeof(s->maps))calloc(s->map_cnt, s->map_skel_sz);\n\
+ s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);\n\
if (!s->maps) \n\
goto err; \n\
",
@@ -518,7 +518,7 @@ static int do_skeleton(int argc, char **argv)
/* programs */ \n\
s->prog_cnt = %zu; \n\
s->prog_skel_sz = sizeof(*s->progs); \n\
- s->progs = (typeof(s->progs))calloc(s->prog_cnt, s->prog_skel_sz);\n\
+ s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);\n\
if (!s->progs) \n\
goto err; \n\
",
--
2.25.1