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~ $ echo 'int main() { puts("Hello world"); return 0; }' > x.c                  
~ $ gcc x.c                                                                     
x.c: In function 'main':                                                        
x.c:1:14: warning: implicit declaration of function 'puts' [-Wimplicit-function-
declaration]                                                                    
 int main() { puts("Hello world"); return 0; }                                  
              ^~~~                                                              
Assembler messages:                                                             
Fatal error: `I' must be the first ISA subset name specified (got r)            
~ $ as --version                                                                
GNU assembler (GNU Binutils) 2.25                                               
Copyright (C) 2014 Free Software Foundation, Inc.                               
This program is free software; you may redistribute it under the terms of       
the GNU General Public License version 3 or later.                              
This program has absolutely no warranty.                                        
This assembler was configured for a target of `riscv32-unknown-linux-gnu'.      
~ $ gcc --version                                                               
gcc (GCC) 8.0.0 20170504 (experimental)                                         
Copyright (C) 2017 Free Software Foundation, Inc.                               
This is free software; see the source for copying conditions.  There is NO      
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.