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H A D | btf.c | 610cd93b Tue May 24 04:44:47 CDT 2022 Douglas Raillard <douglas.raillard@arm.com> libbpf: Fix determine_ptr_size() guessing
One strategy employed by libbpf to guess the pointer size is by finding the size of "unsigned long" type. This is achieved by looking for a type of with the expected name and checking its size.
Unfortunately, the C syntax is friendlier to humans than to computers as there is some variety in how such a type can be named. Specifically, gcc and clang do not use the same names for integer types in debug info:
- clang uses "unsigned long" - gcc uses "long unsigned int"
Lookup all the names for such a type so that libbpf can hope to find the information it wants.
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20220524094447.332186-1-douglas.raillard@arm.com
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