I was recently trying to test GCC's behavior in producing various types of ARM relocations. In particular, I was trying to produce an R_ARM_JUMP24 relocation, which requires veneer. It was suggested that the code most likely to produce this relocation would involve some sort of tail recursion. I wrote up a small test[1] involving interworking and tail recursion to see what the produced object might look like. To my surprise, I found that the compiler instead[2] produced the deprecated R_ARM_PLT32 relocation. Considering the deprecated state of this relocation type, should this be considered a bug? Being a linker implementer, I for one would greatly appreciate it if GCC tried to only use non-deprecated relocation types. I apologize if this has already been fixed upstream.
Cheers, - Ben [1] https://github.com/bgamari/arm-interworking-test [2] $ make cc -marm -fPIC -c -o main.o main.c cc -mthumb -fPIC -c -o thumb.o thumb.c gcc main.o thumb.o -o test.o $ objdump -r main.o main.o: file format elf32-littlearm RELOCATION RECORDS FOR [.text]: OFFSET TYPE VALUE 00000008 R_ARM_PLT32 hi
