[llvm-branch-commits] [ELF] Place .lbss/.lrodata/.ldata after .bss (PR #81224)

[Fangrui Song via llvm-branch-commits]

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@@ -988,10 +991,10 @@ static unsigned getSectionRank(OutputSection &osec) {
       osec.relro = true;
     else
       rank |= RF_NOT_RELRO;
-    // Place .ldata and .lbss after .bss. Making .bss closer to .text alleviates
-    // relocation overflow pressure.
+    // Place .lbss/.lrodata/.ldata after .bss. .bss/.lbss being adjacent reuses
+    // the NOBITS size optimization.
     if (osec.flags & SHF_X86_64_LARGE && config->emachine == EM_X86_64)
-      rank |= RF_LARGE;
+      rank |= osec.type == SHT_NOBITS ? 1 : RF_LARGE;
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MaskRay wrote:

I think we can treat `RF_*` as defining larger regions and integer immediates as a mechanism to pick a subregion within a larger region. The immediate use here is similar to `.interp/SHT_NOTE` and target-specific tunings (`.sdata`, `.got`, etc).

https://github.com/llvm/llvm-project/pull/81224