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scripts/qapi-types.py: Add dummy member to empty structs

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Make sure that all generated C structs have at least one field; this
avoids potential issues with attempting to malloc space for
zero-length structs in C (g_malloc(sizeof struct) would return NULL).
It also avoids an incompatibility with C++ (where an empty struct is
size 1); that isn't important to us now but might be in future.

Generated empty structures look like this:
    struct Abort
    {
        char qapi_dummy_field_for_empty_struct;
    };

This silences clang warnings like:
./qapi-types.h:3752:1: warning: empty struct has size 0 in C, size 1 in C++ [-Wextern-c-compat]
struct Abort
^

Backports commit 83ecb22ba2c91a4674ae109595a8ed1da8de4d7a from qemu
This commit is contained in:
Peter Maydell 2018-02-19 15:56:20 -05:00 committed by Lioncash
parent 5efb546d6f
commit 9a3972b6b2
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1 changed files with 8 additions and 0 deletions
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8
qemu/scripts/qapi-types.py
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@ -90,6 +90,14 @@ struct %(name)s
ret += generate_struct_fields(members)
# Make sure that all structs have at least one field; this avoids
# potential issues with attempting to malloc space for zero-length structs
# in C, and also incompatibility with C++ (where an empty struct is size 1).
if not base and not members:
ret += mcgen('''
char qapi_dummy_field_for_empty_struct;
''')
if len(fieldname):
fieldname = " " + fieldname
ret += mcgen('''