HI, ALL my file tree log is here https://gist.github.com/goog/36cab05f82aba548a432d616fc3c2cbe
build log // ../../../../../../../rtems-4.11.3/c/src/../../testsuites/samples/hello/init.c:301:5: warning: nested extern declaration of 'rtems_stack_checker_report_usage' [-Wnested-externs] ../../../../../../../rtems-4.11.3/c/src/../../testsuites/samples/hello/init.c: At top level: ../../../../../../../rtems-4.11.3/c/src/../../testsuites/samples/hello/init.c:80:14: warning: 'i2c_read' declared 'static' but never defined [-Wunused-function] static uint8 i2c_read(int fd, uint8 reg, uint8 *val); ^ ../../../../../../../rtems-4.11.3/c/src/../../testsuites/samples/hello/init.c:81:14: warning: 'printarray' declared 'static' but never defined [-Wunused-function] static uint8 printarray(uint8 Array[], uint8 Num); ^ mv -f .deps/init.Tpo .deps/init.Po arm-rtems4.11-gcc -B../../../../../stm32f4/lib/ -specs bsp_specs -qrtems -march=armv7-m -mthumb -O2 -g -Wall -Wmissing-prototypes -Wimplicit-function-declaration -Wstrict-prototypes -Wnested-externs -march=armv7-m -mthumb -o hello.exe init.o init.o: In function `Init': /home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites/samples/hello/../../../../../../../rtems-4.11.3/c/src/../../testsuites/samples/hello/init.c:271: undefined reference to `OLED_Init' collect2: error: ld returned 1 exit status make[6]: *** [hello.exe] Error 1 make[6]: Leaving directory `/home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites/samples/hello' make[5]: *** [all-local] Error 1 make[5]: Leaving directory `/home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites/samples' make[4]: *** [all] Error 2 make[4]: Leaving directory `/home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites/samples' make[3]: *** [all-recursive] Error 1 make[3]: Leaving directory `/home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites' make[2]: *** [all-recursive] Error 1 the 'OLED_Init' function in oled.c and also declare in oled.h as extern void OLED_Init(void); dont know why it happened
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