CV-Bowen opened a new pull request, #6132:
URL: https://github.com/apache/incubator-nuttx/pull/6132

   ## Summary
   -fno-tree-loop-distribute-patterns is not supported before GCC 4.6
   
   Optimization option -ftree_loop_distribute_patterns is enabled by default at 
-O3 at GCC 4.6
   I confirmed that by searching "OPT_ftree_loop_distribute_patterns" in gcc 
4.5.4 (https://ftp.gnu.org/gnu/gcc/gcc-4.5.4/) and gcc 4.6.0 
(https://ftp.gnu.org/gnu/gcc/gcc-4.6.0/) release source code.
   
   ## Testing
   compile with gcc 4.5.1 and gcc 9.2.1
   


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