gobject-introspection: use objdump -p instead of prelink-rtld

Commit msg of 767e0880d4
> gobject-introspection: replace prelink-rtld with objdump -p
>
> g-i internally processes the output with regexes, and seems
> happy with what objdump is printing. It only needs to resolve
> the library name as passed to the linker to the library file name.
> Also recursive resolution (that ldd is doing and objdump is not)
> is not necessary.

Additional context section of https://github.com/NixOS/nixpkgs/issues/183071
> prelink is dropped by openembedded, support for prelink is removed from glibc,
> and itself is effectively abandoned by the upstream (yocto project).
> I think we may as well drop it rather than fix it.
> However gobject-introspection now relies on it as a runtime linker for use in cross compilation, we have to find an alternative.

pkgs/development/libraries/gobject-introspection/default.nix

@@ -90,7 +90,13 @@ stdenv.mkDerivation (finalAttrs: {
     "-Dcairo=disabled"
     "-Dgtk_doc=${lib.boolToString (stdenv.hostPlatform == stdenv.buildPlatform)}"
   ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
-    "-Dgi_cross_ldd_wrapper=${buildPackages.prelink}/bin/prelink-rtld"
+    "-Dgi_cross_ldd_wrapper=${substituteAll {
+      name = "g-ir-scanner-lddwrapper";
+      isExecutable = true;
+      src = ./wrappers/g-ir-scanner-lddwrapper.sh;
+      inherit (buildPackages) bash;
+      buildobjdump = "${buildPackages.stdenv.cc.bintools}/bin/objdump";
+    }}"
     "-Dgi_cross_use_prebuilt_gi=true"
     "-Dgi_cross_binary_wrapper=${stdenv.hostPlatform.emulator buildPackages}"
   ];

pkgs/development/libraries/gobject-introspection/giscanner-ignore-error-return-codes-from-ldd-wrapper.patch

@@ -1,32 +0,0 @@
-From e0fc4a2a5161a36483ddc518be9bb14390f11b19 Mon Sep 17 00:00:00 2001
-From: Alexander Kanavin <alex.kanavin@gmail.com>
-Date: Wed, 5 Sep 2018 16:46:52 +0200
-Subject: [PATCH] giscanner: ignore error return codes from ldd-wrapper
-
-prelink-rtld, which we use instead of ldd returns 127 when it can't find a library.
-It is not an error per se, but it breaks subprocess.check_output().
-
-Upstream-Status: Inappropriate [oe-core specific]
-Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
-Signed-off-by: Adam Duskett <aduskett@gmail.com>
----
- giscanner/shlibs.py | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/giscanner/shlibs.py b/giscanner/shlibs.py
-index 9f8ab5df..7a1a72fe 100644
---- a/giscanner/shlibs.py
-+++ b/giscanner/shlibs.py
-@@ -103,7 +103,7 @@ def _resolve_non_libtool(options, binary, libraries):
-             args.extend(['otool', '-L', binary.args[0]])
-         else:
-             args.extend(['ldd', binary.args[0]])
--        output = subprocess.check_output(args)
-+        output = subprocess.run(args, check=False, stdout=subprocess.PIPE).stdout
-         if isinstance(output, bytes):
-             output = output.decode("utf-8", "replace")
- 
--- 
-2.25.1
-
-

pkgs/development/libraries/gobject-introspection/wrapper.nix

@@ -18,24 +18,23 @@ in
 
 (gobject-introspection-unwrapped.override args).overrideAttrs (previousAttrs: {
   pname = "gobject-introspection-wrapped";
-  # failure in e.g. pkgsCross.aarch64-multiplatform.polkit
-  # subprocess.CalledProcessError: Command '['/nix/store/...-prelink-unstable-2019-06-24/bin/prelink-rtld', '/build/source/build/tmp-introspectzp2ldkyk/PolkitAgent-1.0']' returned non-zero exit status 127.
-  patches = previousAttrs.patches ++ [ ./giscanner-ignore-error-return-codes-from-ldd-wrapper.patch ];
   postFixup = (previousAttrs.postFixup or "") + ''
     mv $dev/bin/g-ir-compiler $dev/bin/.g-ir-compiler-wrapped
     mv $dev/bin/g-ir-scanner $dev/bin/.g-ir-scanner-wrapped
 
     (
-      export bash="${buildPackages.bash}/bin/bash"
+      export bash="${buildPackages.bash}"
       export emulator=${lib.escapeShellArg (stdenv.targetPlatform.emulator buildPackages)}
-      export buildprelink="${buildPackages.prelink}/bin/prelink-rtld"
+      export buildobjdump="${buildPackages.stdenv.cc.bintools}/bin/objdump"
 
       export targetgir="${lib.getDev (targetPackages.gobject-introspection-unwrapped.override argsForTarget)}"
 
       substituteAll "${./wrappers/g-ir-compiler.sh}" "$dev/bin/g-ir-compiler"
       substituteAll "${./wrappers/g-ir-scanner.sh}" "$dev/bin/g-ir-scanner"
+      substituteAll "${./wrappers/g-ir-scanner-lddwrapper.sh}" "$dev/bin/g-ir-scanner-lddwrapper"
       chmod +x "$dev/bin/g-ir-compiler"
       chmod +x "$dev/bin/g-ir-scanner"
+      chmod +x "$dev/bin/g-ir-scanner-lddwrapper"
     )
   ''
   # when cross-compiling and using the wrapper then when a package looks up the g_ir_X

pkgs/development/libraries/gobject-introspection/wrappers/g-ir-compiler.sh

@@ -1,4 +1,4 @@
-#! @bash@
+#! @bash@/bin/bash
 # shellcheck shell=bash
 
 exec @emulator@ @targetgir@/bin/g-ir-compiler "$@"

pkgs/development/libraries/gobject-introspection/wrappers/g-ir-scanner-lddwrapper.sh

@@ -0,0 +1,4 @@
+#! @bash@/bin/bash
+# shellcheck shell=bash
+
+exec @buildobjdump@ -p "$@"

pkgs/development/libraries/gobject-introspection/wrappers/g-ir-scanner.sh

@@ -1,7 +1,7 @@
-#! @bash@
+#! @bash@/bin/bash
 # shellcheck shell=bash
 
 exec @dev@/bin/.g-ir-scanner-wrapped \
     --use-binary-wrapper=@emulator@ \
-    --use-ldd-wrapper=@buildprelink@ \
+    --use-ldd-wrapper=@dev@/bin/g-ir-scanner-lddwrapper \
     "$@"