title: "multiple definition of first defined here". STM32, AC6 Studio
body: <p>Im facing a stupid problem, although everything have to be working fine. My Task is - to initialise I/O registers using datatypes of unions and structures. I have used solely my names for the initialisation, so that i could avoid errors caused by redefinition of system variables. However the compiler still shows me an errors for all my created variables, as they have been initialised elsewhere in project. There is my code for the initialisation of variables:</p>
  <pre><code>volatile SYSCFG_t* mysyscfg=(volatile SYSCFG_t*)MYSYSCFG;
  
  volatile RCC_AHB2ENR_t* myrcc_ahb2enr=(volatile RCC_AHB2ENR_t*)(MYRCC|MYAHB2ENR_OFFS);
  
  volatile RCC_APB2ENR_t* myrcc_apb2enr=(volatile RCC_APB2ENR_t*)(MYRCC|MYAPB2ENR_OFFS);
  
  volatile GPIO_t* mygpiob=(volatile GPIO_t*)MYGPIOB;
  
  volatile GPIO_t* mygpioe=(volatile GPIO_t*)MYGPIOE;
  
  volatile GPIO_t* mygpioa=(volatile GPIO_t*)MYGPIOA;
  </code></pre>
  <p>The errrors that i become are the follwing:</p>
  <pre><code>src/main.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:262: multiple definition of `mysyscfg'
  src/init.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:262: first defined here
  src/main.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:263: multiple definition of `myrcc_ahb2enr'
  src/init.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:263: first defined here
  src/main.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:264: multiple definition of `myrcc_apb2enr'
  src/init.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:264: first defined here
  src/main.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:265: multiple definition of `mygpiob'
  src/init.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:265: first defined here
  src/main.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:266: multiple definition of `mygpioe'
  src/init.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:266: first defined here
  src/main.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:267: multiple definition of `mygpioa'
  src/init.o:/home/bogdan/workspace/timers/Debug/../src/lib.h:267: first defined here
  collect2: error: ld returned 1 exit status
  make: *** [makefile:62: timers.elf] Error 1
  </code></pre>