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

[Fangrui Song via llvm-branch-commits]

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@@ -1436,6 +1436,8 @@ static void readConfigs(opt::InputArgList &args) {
   config->zInterpose = hasZOption(args, "interpose");
   config->zKeepTextSectionPrefix = getZFlag(
       args, "keep-text-section-prefix", "nokeep-text-section-prefix", false);
+  config->zLrodataAfterBss =
+      getZFlag(args, "lrodata-after-bss", "nolrodata-after-bss", false);
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MaskRay wrote:

I have explained. The layout should not magically change if the user switches between -no-pie and -pie/-shared. There are a few options to change the layout (-z keep-text-section-prefix, -z separate-code, --no-rosegment, etc), but none does a "smart" choice. 

With -z separate-code and a large max-page-size, one extra PT_LOAD can have a significant waste. I was actually struggling with the default but now I feel that the current layout makes more sense as the default.

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