From 7c8dce4b166113743adad131b5a24c4acc12f92c Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Thu, 26 Dec 2019 13:02:53 -0800 Subject: bpftool: Make skeleton C code compilable with C++ compiler When auto-generated BPF skeleton C code is included from C++ application, it triggers compilation error due to void * being implicitly casted to whatever target pointer type. This is supported by C, but not C++. To solve this problem, add explicit casts, where necessary. To ensure issues like this are captured going forward, add skeleton usage in test_cpp test. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20191226210253.3132060-1-andriin@fb.com --- tools/bpf/bpftool/gen.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'tools/bpf/bpftool') diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index a14d8bc5d31d..7ce09a9a6999 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -397,7 +397,7 @@ static int do_skeleton(int argc, char **argv) { \n\ struct %1$s *obj; \n\ \n\ - obj = calloc(1, sizeof(*obj)); \n\ + obj = (typeof(obj))calloc(1, sizeof(*obj)); \n\ if (!obj) \n\ return NULL; \n\ if (%1$s__create_skeleton(obj)) \n\ @@ -461,7 +461,7 @@ static int do_skeleton(int argc, char **argv) { \n\ struct bpf_object_skeleton *s; \n\ \n\ - s = calloc(1, sizeof(*s)); \n\ + s = (typeof(s))calloc(1, sizeof(*s)); \n\ if (!s) \n\ return -1; \n\ obj->skeleton = s; \n\ @@ -479,7 +479,7 @@ 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 = calloc(s->map_cnt, s->map_skel_sz);\n\ + s->maps = (typeof(s->maps))calloc(s->map_cnt, s->map_skel_sz);\n\ if (!s->maps) \n\ goto err; \n\ ", @@ -515,7 +515,7 @@ 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 = calloc(s->prog_cnt, s->prog_skel_sz);\n\ + s->progs = (typeof(s->progs))calloc(s->prog_cnt, s->prog_skel_sz);\n\ if (!s->progs) \n\ goto err; \n\ ", @@ -538,7 +538,7 @@ static int do_skeleton(int argc, char **argv) \n\ \n\ s->data_sz = %d; \n\ - s->data = \"\\ \n\ + s->data = (void *)\"\\ \n\ ", file_sz); -- cgit