Replace __packed with __attribute__((__packed__)) in uapi headers
Linux uapi headers use __packed as an abbreviation for
__attribute__((__packed__)). In the upstream kernel headers this
is defined in linux/compiler_attributes.h, but it is not defined
in the uapi headers. Bionic defines it in sys/cdefs.h, which will
almost always provide the needed definition, but there are uapi
headers that use __packed and do not include any system headers
that would include sys/cdefs.h. Musl's sys/cdefs.h does not
define __packed, which leads to linker errors when __packed is
treated as a variable name.
Replace __packed with __attribute__((__packed__)) when importing
uapi headers to break the dependency on sys/cdefs.h.
Test: m USE_HOST_MUSL=true on oriole-userdebug in internal master
Change-Id: I45f80f4e5aec868b80ce8eb9d757a3e08ae3e1a9
diff --git a/libc/kernel/tools/defaults.py b/libc/kernel/tools/defaults.py
index abb8f82..d0fe157 100644
--- a/libc/kernel/tools/defaults.py
+++ b/libc/kernel/tools/defaults.py
@@ -94,6 +94,9 @@
"__kernel_old_timeval": "timeval",
# Do the same for __kernel_old_itimerval as for timeval.
"__kernel_old_itimerval": "itimerval",
+ # Replace __packed with __attribute__((__packed__)) to avoid depending
+ # on sys/cdefs.h
+ "__packed": "__attribute__((__packed__))",
}