The size of empty structs (and unions) varies between C and C++. When
including in C++ code our external API in ec_commands.h header with
extern "C". clang will complain (correctly) for all empty structs:
error: empty struct has size 0 in C, size 1 in C++
[-Werror,-Wextern-c-compat]
Remove them from the ec_commands.h header file.
ectool.c has some ugly macros which assume subcommands have both
requests and responses. Change those macros so they only reference
the non-empty sub-structs. The macros are still ugly, but generate
identical output, and don't rely upon zero-length structs.
BUG=chromium:792408
BRANCH=none
TEST=manual
1) Compile the following using 'clang -Wall -Werror':
#include <stdint.h>
extern "C" {
#include "include/ec_commands.h"
}
int main(void) { return 0; }
It compiles without error.
2) Copy the lb_command_paramcount, ms_command_sizes, and
cs_paramcount globals from ectool.c to a dummy .c file and
compile with 'gcc -S' to generate assembly. Do the same
after applying this patch.
Confirm the arrays have the same contents.
Change-Id: Iad76f10315b97205b42118ce070463071fe97128
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/820649
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
7d2ce0c47e