[RISCV] Fix mcount name
GCC's name for this symbol is _mcount, which the Linux kernel expects in
a few different place:
$ echo 'int main(void) { return 0; }' | riscv32-linux-gcc -c -pg -o tmp.o -x c -
$ llvm-objdump -dr tmp.o | grep mcount
0000000c: R_RISCV_CALL _mcount
$ echo 'int main(void) { return 0; }' | riscv64-linux-gcc -c -pg -o tmp.o -x c -
$ llvm-objdump -dr tmp.o | grep mcount
000000000000000c: R_RISCV_CALL _mcount
$ echo 'int main(void) { return 0; }' | clang -c -pg -o tmp.o --target=riscv32-linux-gnu -x c -
$ llvm-objdump -dr tmp.o | grep mcount
0000000a: R_RISCV_CALL_PLT mcount
$ echo 'int main(void) { return 0; }' | clang -c -pg -o tmp.o --target=riscv64-linux-gnu -x c -
$ llvm-objdump -dr tmp.o | grep mcount
000000000000000a: R_RISCV_CALL_PLT mcount
Set MCountName to "_mcount" in RISCVTargetInfo then prevent it from
getting overridden in certain OSTargetInfo constructors.
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D98881
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
GitOrigin-RevId: ef58ae86ba778ed7d01cd3f6bd6d08f943abab44
3 files changed
