xiaoxiang781216 commented on code in PR #5971:
URL: https://github.com/apache/incubator-nuttx/pull/5971#discussion_r841869054
##########
include/nuttx/compiler.h:
##########
@@ -381,6 +381,12 @@
# define UNUSED(a) ((void)(1 || (a)))
+# if defined(__clang__)
+# define no_builtin(n) __attribute__((no_builtin(n)))
+# else
+# define no_builtin(n)
__attribute__((__optimize__("-fno-tree-loop-distribute-patterns")))
Review Comment:
-ffreestanding can fix the problem because it will automatically enable
-fno-builtin which we don't want:
https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html
```
-ffreestanding
Assert that compilation targets a freestanding environment. This implies
-fno-builtin. A freestanding environment is one in which the standard library
may not exist, and program startup may not necessarily be at main. The most
obvious example is an OS kernel. This is equivalent to -fno-hosted.
See [Language Standards Supported by
GCC](https://gcc.gnu.org/onlinedocs/gcc/Standards.html#Standards), for details
of freestanding and hosted environments.
```
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