[GitHub] [incubator-nuttx] anchao opened a new pull request, #7187: arm/armlink: add support of link time optimization(lto)

[GitBox]

anchao opened a new pull request, #7187:
URL: https://github.com/apache/incubator-nuttx/pull/7187

   ## Summary
   
   arm/armlink: add support of link time optimization(lto)
   
   Optimization goal(Code size)
   
   ```
   Smaller                           GCC(-Os) GCC(-flto -Os) CLANG(-flto -Oz) 
ARMCLANG(-flto -Oz/-Omin)
   lm3s6965-ek/qemu-flat(Cortex-M3)   208662      193893           199525       
      195464
   sabre-6quad/smp(Cortex-A9)         131360      122500            N/A         
      123988
                                                  -7.60%           -4.57%       
      -6.75%
   
   Faster performance                GCC(-O3) GCC(-flto -O3) CLANG(-flto 
-Ofast) ARMCLANG(-flto -Ofast) ARMCLANG(-flto -Omax)
   lm3s6965-ek/qemu-flat(Cortex-M3)   257502      296364           369465       
      346696                  384204
   sabre-6quad/smp(Cortex-A9)         166520      196004             N/A        
      207908                  224140
                                                 +15.00%          +43.40%       
     +34.60%                 +49.20%
   ```
   
   Reference:
   
https://developer.arm.com/documentation/101754/0618/armclang-Reference/armclang-Command-line-Options/-O--armclang-
   
   
   
![img_v2_6a717f29-4d5e-4929-b22b-e820cf903cdl](https://user-images.githubusercontent.com/758493/192204290-984a55b9-1dfd-4ad1-a70c-603ec8600c0b.png)
   
   
   
   Signed-off-by: chao an <anc...@xiaomi.com>
   
   
   ## Impact
   
   N/A
   
   ## Testing
   
   lm3s6965-ek/qemu-flat(Cortex-M3)
   sabre-6quad/smp(Cortex-A9)      
   


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