編譯內核錯誤：Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at kernel/timeconst.pl line 373

最近在編譯一個新的rk sdk的時候，編譯內核報錯

  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
make[1]: 'include/generated/mach-types.h' is up to date.
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  TIMEC   kernel/timeconst.h
Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at kernel/timeconst.pl line 373.
/home/liuxueneng/workCode/rk3066/kernel/kernel/Makefile:141: recipe for target 'kernel/timeconst.h' failed
make[1]: *** [kernel/timeconst.h] Error 255
Makefile:973: recipe for target 'kernel' failed
make: *** [kernel] Error 2

顯示錯誤

Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at kernel/timeconst.pl line 373

已經提示纖細的錯誤信息在哪里了，打開timeconst.ps看一下

 372        @val = @{$canned_values{$hz}};                                        
 373         if (!defined(@val)) {                                                          
 374                 @val = compute_values($hz);                                   
 375         }                                                                     
 376         output($hz, @val);

 

改成如下就可以編譯了

 

 372        @val = @{$canned_values{$hz}};                                        
 373         if (!@val) {                                                          
 374                 @val = compute_values($hz);                                   
 375         }                                                                     
 376         output($hz, @val);

參考http://blog.5ibc.net/p/48570.html

查了一下更新，發現其中有一項是perl版本升級到了 v5.22.1，然后查了perl官方文檔，發現官網因為一個bug，該版本將defined(@array)去掉了。可以直接使用數組判斷非空。