build: enable -fPIC to avoid relocation against the same label

[Ziyue-Zhang]

• without -fPIC, may have compile error when compile the NEMU as dut

[poemonsense]

I do not know about -fPIC. Any test for this?

Or maybe other people familar with this should have a review. I don't know much about this option

[Ziyue-Zhang]

I do not know about -fPIC. Any test for this?

Or maybe other people familar with this should have a review. I don't know much about this option

when I run make riscv64-xs_defconfig and make, there is a compilation failure. Using -fPIC can solve it. I also don't know why using -fPIC can solve this problem, fpic is generally used when compiling dynamic link libraries. Maybe using fpic doesn't really solve the problem.

Following is my compile error:

• CXX src/memory/store_queue_wrapper.cpp mkdir -p resource/softfloat/build ln -sf /nfs/home/zhangziyue/NEMU/resource/softfloat/repo/build/Linux-x86_64-GCC/softfloat.a resource/softfloat/build/softfloat.a
• ccache g++ /nfs/home/zhangziyue/NEMU/build/riscv64-nemu-interpreter /usr/bin/ld: /tmp/ccJtUK8R.ltrans4.ltrans.o: warning: relocation against .L737' in read-only section.text' /usr/bin/ld: /tmp/ccJtUK8R.ltrans4.ltrans.o: in function `tcache_init.constprop.0': :(.text+0x2e57): undefined reference to `.L737' /usr/bin/ld: warning: creating DT_TEXTREL in a PIE collect2: error: ld returned 1 exit status make: *** [/nfs/home/zhangziyue/NEMU/scripts/build.mk:81: /nfs/home/zhangziyue/NEMU/build/riscv64-nemu-interpreter] Error 1