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linuxHeaders: fix build on 32-bit systems with 64-bit inodes

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Without the change builx of `pkgsi686Linux.linuxHeaders` fails on my
`btrfs` with 64-bit inodes as:

    linux-headers> fixdep: error fstat'ing file: scripts/basic/.fixdep.d: Value too large for defined data type

Normally `Kbuild` attempts to pass correct LFS flags by extracting
them from `getconf` as:
    HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)

But `nixpkgs` does not provide it and the build fails.

The change hardcodes LFS flags for 32-bit systems.
This commit is contained in:
Sergei Trofimovich
2025-08-01 21:58:28 +01:00
committed by Alyssa Ross
parent f440907129
commit 6519e3fb71
1 changed files with 10 additions and 0 deletions
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pkgs/os-specific/linux/kernel-headers/default.nix
+10
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@@ -90,6 +90,16 @@ let
# `$(..)` expanded by make alone
"HOSTCC:=$(CC_FOR_BUILD)"
"HOSTCXX:=$(CXX_FOR_BUILD)"
# To properly detect LFS flags 32-bit build environments like
# pkgsi686Linux.linuxHeaders Kbuild uses this Makefile bit:
# HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
#
# `getconf` is not available in early bootstrap and thus the
# build fails on filesystems with 64-bit inodes as:
# linux-headers> fixdep: error fstat'ing file: scripts/basic/.fixdep.d: Value too large for defined data type
#
# Let's hardcode subset of the output of `getconf` for this case.
"HOST_LFS_CFLAGS=-D_FILE_OFFSET_BITS=64"
];
# Skip clean on darwin, case-sensitivity issues.