https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94391
--- Comment #23 from Fangrui Song <i at maskray dot me> --- (In reply to Andrew Pinski from comment #18) > (In reply to Yuxuan Shui from comment #17) > > Sorry, I am here to report a bug, not to find a workaround for my use case. > > I gave you the correct usage for your use case. If you don't like it is not > my fault. A wontfix/invalid does not seem a proper resolution to the bug(s). We need a solution, instead of a workaround (SHN_ABS _binary_*_size can be changed to _binary_*_end minus _binary_*_start). Let me repeat. The code has worked fine for a long time. 1. -fno-pie code can only be linked with -no-pie. A PC32 relocation can be resolved to a SHN_ABS definition. 2. -fpie code can be linked with either -no-pie or -pie. 3. -fpic code can be linked with -no-pie, -pie or -shared. GCC produces a GOT relocation. The linker will fill up the GOT entry at link time. It is a constant at runtime. 1 and 3 always work. For 2 -fpie -pie, it is incorrect to reference a non-preemptible SHN_ABS symbol with a PC relative relocation in a PIC (-shared or -pie) link (missed GNU ld diagnostic: https://sourceware.org/bugzilla/show_bug.cgi?id=25749) A GOT relocation was produced until commit 77ad54d911dd7cb88caf697ac213929f6132fdcf ("x86-64: Optimize access to globals in PIE with copy reloc"). I have proposed my solution in Comment 10: revert the patch. It has very little value after H.J. invented GOTPCRELX in 2015. As a compensation, we can invent a pair of new -f options, -f(no-)direct-access-extern-object. -fno-pie defaults to -fdirect-access-extern-object. -fpie defaults to -fno-direct-access-extern-object. -fno-pie users who really want to get rid of copy relocations can enable -fno-direct-access-extern-object. Note: a copy relocation is needed if the definition turns out to be provided by a shared object. -fpie users who really care about GOT slowdown can enable -fdirect-access-extern-object. This is more relevant on non-x86 due to the lack of linker relaxation (R_X86_64_{REX_,}GOTPCRELX)
