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dev-shell: Disable separateDebugInfo

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This breaks gdb pretty-printers inserted into .debug_gdb_scripts section,
because it implies --compress-debug-sections=zlib, -Wa,--compress-debug-sections.
This is very unfortunate, because then gdb can't use pretty printers for
Boost.Unordered (which are very useful, since boost::unoredred_flat_map is
impossible to debug). This seems perfectly fine to disable in the dev-shell for
the time being.

See [1-3] for further references.

With this change I'm able to use boost's pretty-printers out-of-the box:

```
p *importResolutionCache
$2 = boost::concurrent_flat_map with 1 elements = {[{accessor = {p = std::shared_ptr<nix::SourceAccessor> (use count 5, weak count 1) = {
        get() = 0x555555d830a8}}, path = {static root = {static root = <same as static member of an already seen type>, path = "/"},
      path = "/derivation-internal.nix"}}] = {accessor = {p = std::shared_ptr<nix::SourceAccessor> (use count 5, weak count 1) = {
        get() = 0x555555d830a8}}, path = {static root = {static root = <same as static member of an already seen type>, path = "/"},
      path = "/derivation-internal.nix"}}}
```

When combined with a simple `add-auto-load-safe-path ~/code` in .gdbinit

[1]: https://gerrit.lix.systems/c/lix/+/3880
[2]: https://git.lix.systems/lix-project/lix/issues/1003
[3]: https://sourceware.org/pipermail/gdb-patches/2025-October/221398.html
This commit is contained in:
Sergei Zimmerman 2025-10-07 01:35:37 +03:00
parent fb117e0cac
commit c5b88c22fa
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1 changed files with 41 additions and 32 deletions
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73
packaging/dev-shell.nix
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@ -70,6 +70,9 @@ pkgs.nixComponents2.nix-util.overrideAttrs (
# We use this shell with the local checkout, not unpackPhase.
src = null;
# Workaround https://sourceware.org/pipermail/gdb-patches/2025-October/221398.html
# Remove when gdb fix is rolled out everywhere.
separateDebugInfo = false;
env = {
# For `make format`, to work without installing pre-commit
@ -93,38 +96,44 @@ pkgs.nixComponents2.nix-util.overrideAttrs (
++ map (transformFlag "libcmd") (ignoreCrossFile pkgs.nixComponents2.nix-cmd.mesonFlags);
nativeBuildInputs =
attrs.nativeBuildInputs or [ ]
++ pkgs.nixComponents2.nix-util.nativeBuildInputs
++ pkgs.nixComponents2.nix-store.nativeBuildInputs
++ pkgs.nixComponents2.nix-fetchers.nativeBuildInputs
++ pkgs.nixComponents2.nix-expr.nativeBuildInputs
++ lib.optionals havePerl pkgs.nixComponents2.nix-perl-bindings.nativeBuildInputs
++ lib.optionals buildCanExecuteHost pkgs.nixComponents2.nix-manual.externalNativeBuildInputs
++ pkgs.nixComponents2.nix-internal-api-docs.nativeBuildInputs
++ pkgs.nixComponents2.nix-external-api-docs.nativeBuildInputs
++ pkgs.nixComponents2.nix-functional-tests.externalNativeBuildInputs
++ lib.optional (
!buildCanExecuteHost
# Hack around https://github.com/nixos/nixpkgs/commit/bf7ad8cfbfa102a90463433e2c5027573b462479
&& !(stdenv.hostPlatform.isWindows && stdenv.buildPlatform.isDarwin)
&& stdenv.hostPlatform.emulatorAvailable pkgs.buildPackages
&& lib.meta.availableOn stdenv.buildPlatform (stdenv.hostPlatform.emulator pkgs.buildPackages)
) pkgs.buildPackages.mesonEmulatorHook
++ [
pkgs.buildPackages.cmake
pkgs.buildPackages.gnused
pkgs.buildPackages.shellcheck
pkgs.buildPackages.changelog-d
modular.pre-commit.settings.package
(pkgs.writeScriptBin "pre-commit-hooks-install" modular.pre-commit.settings.installationScript)
pkgs.buildPackages.nixfmt-rfc-style
pkgs.buildPackages.shellcheck
pkgs.buildPackages.gdb
]
++ lib.optional (stdenv.cc.isClang && stdenv.hostPlatform == stdenv.buildPlatform) (
lib.hiPrio pkgs.buildPackages.clang-tools
)
++ lib.optional stdenv.hostPlatform.isLinux pkgs.buildPackages.mold-wrapped;
let
inputs =
attrs.nativeBuildInputs or [ ]
++ pkgs.nixComponents2.nix-util.nativeBuildInputs
++ pkgs.nixComponents2.nix-store.nativeBuildInputs
++ pkgs.nixComponents2.nix-fetchers.nativeBuildInputs
++ pkgs.nixComponents2.nix-expr.nativeBuildInputs
++ lib.optionals havePerl pkgs.nixComponents2.nix-perl-bindings.nativeBuildInputs
++ lib.optionals buildCanExecuteHost pkgs.nixComponents2.nix-manual.externalNativeBuildInputs
++ pkgs.nixComponents2.nix-internal-api-docs.nativeBuildInputs
++ pkgs.nixComponents2.nix-external-api-docs.nativeBuildInputs
++ pkgs.nixComponents2.nix-functional-tests.externalNativeBuildInputs
++ lib.optional (
!buildCanExecuteHost
# Hack around https://github.com/nixos/nixpkgs/commit/bf7ad8cfbfa102a90463433e2c5027573b462479
&& !(stdenv.hostPlatform.isWindows && stdenv.buildPlatform.isDarwin)
&& stdenv.hostPlatform.emulatorAvailable pkgs.buildPackages
&& lib.meta.availableOn stdenv.buildPlatform (stdenv.hostPlatform.emulator pkgs.buildPackages)
) pkgs.buildPackages.mesonEmulatorHook
++ [
pkgs.buildPackages.cmake
pkgs.buildPackages.gnused
pkgs.buildPackages.shellcheck
pkgs.buildPackages.changelog-d
modular.pre-commit.settings.package
(pkgs.writeScriptBin "pre-commit-hooks-install" modular.pre-commit.settings.installationScript)
pkgs.buildPackages.nixfmt-rfc-style
pkgs.buildPackages.shellcheck
pkgs.buildPackages.gdb
]
++ lib.optional (stdenv.cc.isClang && stdenv.hostPlatform == stdenv.buildPlatform) (
lib.hiPrio pkgs.buildPackages.clang-tools
)
++ lib.optional stdenv.hostPlatform.isLinux pkgs.buildPackages.mold-wrapped;
in
# FIXME: separateDebugInfo = false doesn't actually prevent -Wa,--compress-debug-sections
# from making its way into NIX_CFLAGS_COMPILE.
lib.filter (p: !lib.hasInfix "separate-debug-info" p) inputs;
buildInputs = [
pkgs.gbenchmark