[PATCH v2 0/3] LoongArch: Allow and correctly resolve PC-relative relocs against local undefined weak symbols

[Xi Ruoyao]

Prompted by https://lore.kernel.org/loongarch/20241206085810.112341-1-chenhuacai@loongson.cn/.

Changes from [v1]:

- In the message of patch 2, refer to the correct commit where the check
  against undefined weak symbol was introduced.
- In patch 3:
  - always suggest -fPIC for DSO
  - always suggest -mno-direct-extern-access for PDE
  - for PIE, if the bad reloc is already PC-relative, suggest
    -mno-direct-extern-access; otherwise suggest -fPIE
  - if the bad reloc is already PC-relative or linking a PDE, suggest
    checking the symbol visibility

[v1]:https://sourceware.org/pipermail/binutils/2024-December/138080.html:

Cc: mengqinggang@loongson.cn
Cc: Lulu Cai <cailulu@loongson.cn>
Cc: Chenghua Xu <xuchenghua@loongson.cn>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>

*** BLURB HERE ***

Xi Ruoyao (3):
  LoongArch: Fix resolution of undefined weak hidden/protected symbols
  LoongArch: Allow R_LARCH_PCALA_HI20 or R_LARCH_PCREL20_S2 against
    undefined weak symbols for static PIE
  LoongArch: Reword message for unresolvable relocs

 bfd/elfnn-loongarch.c                         | 123 +++++++++++++-----
 include/opcode/loongarch.h                    |   2 +
 .../ld-loongarch-elf/bad_pcala_hi20_global.d  |   2 +-
 .../bad_pcala_hi20_global_pie.d               |   2 +-
 .../ld-loongarch-elf/bad_pcala_hi20_weak.d    |   2 +-
 .../bad_pcala_hi20_weak_pie.d                 |   2 +-
 .../ld-loongarch-elf/bad_pcrel20_s2_global.d  |   2 +-
 .../ld-loongarch-elf/bad_pcrel20_s2_weak.d    |   2 +-
 .../ld-loongarch-elf/ld-loongarch-elf.exp     |   3 +
 .../ld-loongarch-elf/weak-undef-hidden-pie.d  |  14 ++
 .../weak-undef-hidden-shared.d                |  14 ++
 .../ld-loongarch-elf/weak-undef-hidden.s      |   9 ++
 .../ld-loongarch-elf/weak-undef-static-pie.d  |  13 ++
 .../ld-loongarch-elf/weak-undef-static-pie.s  |   8 ++
 14 files changed, 160 insertions(+), 38 deletions(-)
 create mode 100644 ld/testsuite/ld-loongarch-elf/weak-undef-hidden-pie.d
 create mode 100644 ld/testsuite/ld-loongarch-elf/weak-undef-hidden-shared.d
 create mode 100644 ld/testsuite/ld-loongarch-elf/weak-undef-hidden.s
 create mode 100644 ld/testsuite/ld-loongarch-elf/weak-undef-static-pie.d
 create mode 100644 ld/testsuite/ld-loongarch-elf/weak-undef-static-pie.s

-- 
2.47.1