A C/C++ program can define external variable names (without an underscore (_)).

In an assembly-language program, .GLB is used to declare an external name (preceded by an underscore).

[Example of C source]

int a;

[Example of assembly-language source]

     .GLB _a

     .SECTION P,CODE

     MOV.L #A_a,R1

     MOV.L [R1],R2

     ADD #1,R2

     MOV.L R2,[R1]

     RTS

     .SECTION D,ROMDATA,ALIGN=4

A_a: .LWORD _a

     .END