acassis commented on issue #5956:
URL:
https://github.com/apache/incubator-nuttx/issues/5956#issuecomment-1086652439
Doing bisect I discovered that the issue was caused by commit
ee931c137fb795630b4c68f040861583d52a3efd
Adding -fno-builtin back to CFLAGS fixed the issue:
```
diff --git a/boards/sim/sim/sim/scripts/Make.defs
b/boards/sim/sim/sim/scripts/Make.defs
index fb6bad3a97..abaa5bb2bd 100644
--- a/boards/sim/sim/sim/scripts/Make.defs
+++ b/boards/sim/sim/sim/scripts/Make.defs
@@ -67,8 +67,8 @@ endif
# Add -fno-common because macOS "ld -r" doesn't seem to pick objects
# for common symbols.
-ARCHCFLAGS = -fno-common -ffunction-sections -fdata-sections
-ARCHCXXFLAGS = -fno-common -ffunction-sections -fdata-sections -nostdinc++
+ARCHCFLAGS = -fno-common -fno-builtin -ffunction-sections -fdata-sections
+ARCHCXXFLAGS = -fno-common -fno-builtin -ffunction-sections -fdata-sections
-nostdinc++
ifeq ($(CONFIG_CXX_EXCEPTION),)
ARCHCXXFLAGS += -fno-exceptions -fcheck-new
```
@xiaoxiang781216 could you please verify?
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