__clzsi2_thumb1() fails to link due to R_ARM_ABS32 relocation error with PIC

[ikskuh]

Zig Version

0.14.0-dev.2271+f845fa04a

Steps to Reproduce and Observed Behavior

Compile any file with

[user@host ~]$ zig build-exe -target thumb-freestanding-eabi -mcpu cortex_m0plus -fPIE stub.zig 

which results in

[user@host ~]$ zig build-exe -target thumb-freestanding-eabi -mcpu cortex_m0plus -fPIE src/main.zig 
error: ld.lld: relocation R_ARM_ABS32 cannot be used against local symbol; recompile with -fPIC
    note: defined in /home/user/.cache/zig/o/…/libcompiler_rt.a(/home/user/.cache/zig/o/…/libcompiler_rt.a.o)
    note: referenced by compiler_rt
    note:               /home/user/.cache/zig/o/…/libcompiler_rt.a.o:(__clzsi2) in archive /home/user/.cache/zig/o/…/libcompiler_rt.a
[user@host ~]$ 

stub.zig may look like this:

export fn _start() void {}

Expected Behavior

compiler_rt should be compiled with -fPIC if the build artifact is built as position independent code (-fPIC, -fPIE)

Related Issues

• potentially compiler_rt not respecting the CPU features on cross-compile #16957

[ikskuh]

Ashet OS is currently kinda blocking on this as i want to add support for ARM systems and i need PIE executables to be able to load applications without virtual memory

[alexrp]

To clarify, is this a regression or does it also happen with 0.13.0?

[alexrp]

I can find no evidence that PIC isn't being enabled for compiler-rt. This looks like a problem specific to __clzsi2 which has special-casing for Thumb. LLD is just giving an unhelpful error message.

[ikskuh]

To clarify, is this a regression or does it also happen with 0.13.0?

Also happens in 0.13.0