From 82c436587c31cd760aef4db3661d54553ab88b87 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sat, 3 Feb 2018 15:04:39 +0100
Subject: [PATCH] Do not create deep backtraces unless in ENABLE_DEBUG mode

Signed-off-by: Clifford Wolf <clifford@clifford.at>
---
 Makefile      | 4 ++--
 kernel/log.cc | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index dcc8be3eb..39e173a26 100644
--- a/Makefile
+++ b/Makefile
@@ -264,9 +264,9 @@ endif
 
 ifeq ($(ENABLE_DEBUG),1)
 ifeq ($(CONFIG),clang)
-CXXFLAGS := -O0 $(filter-out -Os,$(CXXFLAGS))
+CXXFLAGS := -O0 -DDEBUG $(filter-out -Os,$(CXXFLAGS))
 else
-CXXFLAGS := -Og $(filter-out -Os,$(CXXFLAGS))
+CXXFLAGS := -Og -DDEBUG $(filter-out -Os,$(CXXFLAGS))
 endif
 endif
 
diff --git a/kernel/log.cc b/kernel/log.cc
index 7be95204b..8b12008bc 100644
--- a/kernel/log.cc
+++ b/kernel/log.cc
@@ -375,6 +375,9 @@ void log_backtrace(const char *prefix, int levels)
 
 	if (levels <= 1) return;
 
+#ifndef DEBUG
+	log("%sframe #2: [build Yosys with ENABLE_DEBUG for deeper backtraces]\n", prefix);
+#else
 	if ((p = __builtin_extract_return_addr(__builtin_return_address(1))) && dladdr(p, &dli)) {
 		log("%sframe #2: %p %s(%p) %s(%p)\n", prefix, p, dli.dli_fname, dli.dli_fbase, dli.dli_sname, dli.dli_saddr);
 	} else {
@@ -446,6 +449,7 @@ void log_backtrace(const char *prefix, int levels)
 	}
 
 	if (levels <= 9) return;
+#endif
 }
 #else
 void log_backtrace(const char*, int) { }
-- 
2.30.2