t/perf: export variable used in other blocks

diff --git a/git-compat-util.h b/git-compat-util.h
index f46d40e4a475c9bd35ff02373101e8431e722b7d..ef6d560e156c0adefd897e04377b09d5c32edf08 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -527,6 +527,16 @@ static inline int ends_with(const char *str, const char *suffix)
        return strip_suffix(str, suffix, &len);
 }
 
+#define SWAP(a, b) do {                                                \
+       void *_swap_a_ptr = &(a);                               \
+       void *_swap_b_ptr = &(b);                               \
+       unsigned char _swap_buffer[sizeof(a)];                  \
+       memcpy(_swap_buffer, _swap_a_ptr, sizeof(a));           \
+       memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) +            \
+              BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b)));   \
+       memcpy(_swap_b_ptr, _swap_buffer, sizeof(a));           \
+} while (0)
+
 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 
 #ifndef PROT_READ