fix(ltrace): re-enable ltrace when PIE test fix lands in nixpkgs-unstable

[Bad3r]

Summary

ltrace has been temporarily disabled due to a test failure in the ltrace-0.7.91 package when building in nixpkgs-unstable.

Root Cause

The ltrace test suite fails due to GCC 15's stricter function pointer type checking:

passing argument 1 of 'clone' from incompatible pointer type [-Wincompatible-pointer-types]
expected 'int (*)(void *)' but argument is of type 'int (*)(void)'

This causes:

• trace-clone.ltrace test fails (expected 1, got 0)
• Build fails with "2 unexpected failures" in test suite

Upstream References

• GCC 15 fix PR: ltrace: fix compilation with GCC15 NixOS/nixpkgs#475934
• Original fix PR (superseded): ltrace: fix test failure with PIE NixOS/nixpkgs#449551
• Related issue: gcc: build with --enable-default-pie configure option NixOS/nixpkgs#439314
• GCC 14/15 porting guide: https://gcc.gnu.org/gcc-14/porting_to.html

Affected Code

modules/system76/apps-enable.nix#L139-L141

      # TODO(#42): Re-enable when ltrace PIE test fix lands in nixpkgs-unstable
      # See: https://github.com/NixOS/nixpkgs/pull/449551
      ltrace.extended.enable = lib.mkOverride 1100 false;

Related Issues - GCC 15 Compatibility

This issue is part of a pattern of GCC 15 compatibility problems affecting multiple packages:

Issue	Package	Error Type
#41	VMware/readline70	K&R style C declarations
#42	ltrace	-Wincompatible-pointer-types (clone function)
#43	john	-Wincompatible-pointer-types (gpg2john function pointers)

Resolution

Re-enable when NixOS/nixpkgs#475934 lands in nixpkgs-unstable.