[llvm-bugs] [Bug 42289] New: LLD fails to merge similarly named sections

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42289

            Bug ID: 42289
           Summary: LLD fails to merge similarly named sections
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: llvm-bugs at lists.llvm.org, peter.smith at linaro.org,
                    sedat.dilek at gmail.com, srhines at google.com
            Blocks: 4068

via: https://github.com/ClangBuiltLinux/linux/issues/431

It seems that ld.bfd merges sections with the same name, whereas ld.lld does
not.

$ ld.bfd -r -o driver.ko ath10k_core.o ath10k_core.mod.o
$ readelf -S driver.ko | grep rodata\.cst32  [71] .rodata.cst32     PROGBITS   
     0000000000000000  00062d60

$  ld.lld -r -o driver.ko ath10k_core.o ath10k_core.mod.o
$ readelf -S driver.ko | grep rodata\.cst32
  [104] .rodata.cst32     PROGBITS         0000000000000000  00a20850
  [157] .rodata.cst32     PROGBITS         0000000000000000  00a20e20

This produces dmesg warnings for kernel modules linked with LLD:

$ dmesg | grep sysfs:
[    1.969125] sysfs: cannot create duplicate filename
'/module/i915/sections/.rodata.cst16'
[    3.954645] sysfs: cannot create duplicate filename
'/module/bluetooth/sections/.rodata.cst16'
[    4.009524] sysfs: cannot create duplicate filename
'/module/mac80211/sections/.rodata.cst32'
[    4.122455] sysfs: cannot create duplicate filename
'/module/ath10k_core/sections/.rodata.cst32'


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=4068
[Bug 4068] [Meta] Compiling the Linux kernel with clang
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