Hi, I am trying to create a library that handles the USART TX and RX data. The buffer used for the TX and RX data I declared as extern as this needs to be specified by the application using the library. This works fine in Keil ARM-MDK. Attempting to build this in the latest version of GCC shows the following errors: C:\yagarto_cortex_m3\bin\arm-none-eabi-gcc libhl_usart.o -mcpu=cortex-m3 -mthumb -nostartfiles -Tstm32f103x_xl_flash.ld -Wl,-Map=lib_usart.map,--cref,--no-warn-mismatch -L./lib/ -lm -lgcc -lc ./lib/lib_stm3210x_xl_stdperiph.a -o lib_usart.elf libhl_usart.o: In function `Libhl_Usart_Lib_Init': libhl_usart.c:(.text+0x1a): undefined reference to `Libhl_Usart2_Tx_Buff' libhl_usart.c:(.text+0x1e): undefined reference to `Libhl_Usart2_Tx_Buff' libhl_usart.c:(.text+0x2c): undefined reference to `Libhl_Usart3_Tx_Buff' libhl_usart.c:(.text+0x30): undefined reference to `Libhl_Usart3_Tx_Buff' libhl_usart.c:(.text+0x3e): undefined reference to `Libhl_Uart4_Tx_Buff' libhl_usart.c:(.text+0x42): undefined reference to `Libhl_Uart4_Tx_Buff' libhl_usart.c:(.text+0x50): undefined reference to `Libhl_Uart5_Tx_Buff' libhl_usart.c:(.text+0x54): undefined reference to `Libhl_Uart5_Tx_Buff' libhl_usart.c:(.text+0x62): undefined reference to `Libhl_Usart1_Rx_Buff' libhl_usart.c:(.text+0x66): undefined reference to I am sure that I am just missing some compiler option that will allow it to assume that the data will be available when needed. I am attaching the code and makefile. http://gcc.1065356.n5.nabble.com/file/n865274/code_makefile.rar code_makefile.rar Please help me solve this problem. Thanks, -- View this message in context: http://gcc.1065356.n5.nabble.com/Building-library-with-extern-data-fails-in-GCC-tp865274.html Sent from the gcc - Help mailing list archive at Nabble.com.
