The UNIQUE() macro works fine if used in un-stacked macros. However, once
you stack them like:
MAX(MIN(a, b),
CLAMP(MAX(c, d), e, f))
you will get warnings due to shadowing other variables. gcc uses the last
line of a macro expansion as value for __LINE__, therefore, we cannot even
avoid this by splitting the expressions across lines.
Remove the only user of UNIQUE() so we introduce a new helper in
follow-ups.
#define XCONCATENATE(x, y) x ## y
#define CONCATENATE(x, y) XCONCATENATE(x, y)
-#define UNIQUE(prefix) CONCATENATE(prefix, __LINE__)
-
/* Rounds up */
#define ALIGN4(l) (((l) + 3) & ~3)
#else
#define assert_cc(expr) \
DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
- struct UNIQUE(_assert_struct_) { \
+ struct CONCATENATE(_assert_struct_, __LINE__) { \
char x[(expr) ? 0 : -1]; \
}; \
REENABLE_WARNING