Tuesday, April 13, 2010
Strange link errors when building load modules
Q: One of our customers is trying to build pbench as a load module with BSP_MPC8377_OSE5.4 and getting link errors. We can build the same lm on the same release and bsp without errors. What is going on?
$ make lm
/home/user1/OSE/BSP_MPC8377_OSE5.4/refsys/modules/pbench
--- Preprocessing linker control file obj/powerpc/debug/gcc_lm.lcf ../../compilers/gcc_lm.lcf
--- Linking obj/powerpc/debug/unconfigured (pass 1)
--- Linking obj/powerpc/debug/unconfigured (pass 2)
obj/powerpc/debug/unconfigured_ro: In function `clib_pointer':
stdout.c:(.text+0xac54): undefined reference to `_SDA2_BASE_'
obj/powerpc/debug/unconfigured_ro: In function `zzinit_OSE': (.text+0xacae): undefined reference to `_SDA_BASE_'
obj/powerpc/debug/unconfigured_ro: In function `zzinit_OSE':
(.text+0xacb2): undefined reference to `_SDA_BASE_'
make: *** [obj/powerpc/debug/unconfigured] Error 1
A: These bizarre errors, which leave no clue as to their true cause, can occur if the user doesn't use the toolchain version that is shipped for the corresponding OSE version. In other words, newer or older compilers may present unforseen problems. In this case, toolchain is GNU, and the _SDA_BASE_ and similiar vars are already part of our CRT library but weren't being pulled in due to a later GNU ld version of 2.19 instead of the 2.16.1 version we ship for OSE5.4.1. A quick version check is always useful:
$ which powerpc-eabi-ld
/cygdrive/c/OSE/OSE5.4.1_PPC/gcc_win32_powerpc_4.2.3/bin/powerpc-eabi-ld
$ powerpc-eabi-ld -v
GNU ld version 2.16.1
$ make lm
/home/user1/OSE/BSP_MPC8377_OSE5.4/refsys/modules/pbench
--- Preprocessing linker control file obj/powerpc/debug/gcc_lm.lcf ../../compilers/gcc_lm.lcf
--- Linking obj/powerpc/debug/unconfigured (pass 1)
--- Linking obj/powerpc/debug/unconfigured (pass 2)
obj/powerpc/debug/unconfigured_ro: In function `clib_pointer':
stdout.c:(.text+0xac54): undefined reference to `_SDA2_BASE_'
obj/powerpc/debug/unconfigured_ro: In function `zzinit_OSE': (.text+0xacae): undefined reference to `_SDA_BASE_'
obj/powerpc/debug/unconfigured_ro: In function `zzinit_OSE':
(.text+0xacb2): undefined reference to `_SDA_BASE_'
make: *** [obj/powerpc/debug/unconfigured] Error 1
A: These bizarre errors, which leave no clue as to their true cause, can occur if the user doesn't use the toolchain version that is shipped for the corresponding OSE version. In other words, newer or older compilers may present unforseen problems. In this case, toolchain is GNU, and the _SDA_BASE_ and similiar vars are already part of our CRT library but weren't being pulled in due to a later GNU ld version of 2.19 instead of the 2.16.1 version we ship for OSE5.4.1. A quick version check is always useful:
$ which powerpc-eabi-ld
/cygdrive/c/OSE/OSE5.4.1_PPC/gcc_win32_powerpc_4.2.3/bin/powerpc-eabi-ld
$ powerpc-eabi-ld -v
GNU ld version 2.16.1
Labels: gcc, linker, lm, OSE5.4, OSE5.4.1
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