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-rw-r--r--gc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index 556189b889..da2bc2a059 100644
--- a/gc.c
+++ b/gc.c
@@ -221,8 +221,12 @@ static ruby_gc_params_t gc_params = {
* 5: sweep
*/
#ifndef RGENGC_DEBUG
+#ifdef RUBY_DEVEL
+#define RGENGC_DEBUG -1
+#else
#define RGENGC_DEBUG 0
#endif
+#endif
#if RGENGC_DEBUG < 0
#undef RGENGC_DEBUG
#define RGENGC_DEBUG ruby_rgengc_debug