set quietly on Windows

Author: ccmywish

src/framework/core.c

@@ -1149,12 +1149,12 @@ chsrc_view_env (const char *var1, ...)
 #else
       if (first)
         {
-          cmd = xy_strjoin (3, "echo $", var, " ");
+          cmd = xy_strjoin (5, "echo ", var, "=$", var, " ");
           first = false;
         }
       else
         {
-          cmd = xy_strjoin (4, cmd, "; echo $", var, " ");
+          cmd = xy_strjoin (6, cmd, "; echo ", var, "=$", var, " ");
         }
 #endif
       var = va_arg (vars, const char *);
@@ -1164,7 +1164,13 @@ chsrc_view_env (const char *var1, ...)
 
   if (var1)
     {
-      chsrc_run (cmd, RunOpt_Dont_Notify_On_Success|RunOpt_No_Last_New_Line);
+      /**
+       * 不用 chsrc_run()，因为在Windows上，set在遇到环境变量未定义时会返回非0，导致 chsrc_run() 报告运行失败
+       * 这个错误过于醒目。我们应该像在 sh 一样，默默地没有输出即可，而不是报错
+       */
+      // chsrc_run (cmd, RunOpt_Dont_Notify_On_Success|RunOpt_No_Last_New_Line|RunOpt_Dont_Abort_On_Failure);
+      int status = system (cmd);
+      if (status!=0) {/* NOOP */}
     }
   else
     {