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/freebsd/share/mk/
H A Dbsd.debug.mkdiff 4f81c42fbd76e25c9fe696fa08296b79c55fbf09 Thu Aug 21 16:06:34 CEST 2025 Mark Johnston <markj@FreeBSD.org> share/mk: Substitute reproducible prefixes in dwarf info

Ensure that worlds/releases built from different source paths are
reproducible. Currently they are not since src and obj paths are
embedded in DWARF info. There are some uses of __FILE__ in the src tree
as well, and they are similarly handled by this change.

Use /usr/src and /usr/obj as the canonical src and obj paths when
WITH_REPRODUCIBLE_BUILD is defined. Define a DEBUG_PREFIX variable
which is used to ask the compiler to substitute paths in output files
using -ffile-prefix-map.

Compat builds (i.e., lib32) complicate things since they override
OBJROOT to point to obj-${compat} but still refer to headers from the
native objroot (e.g., llvm headers).

MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D50951
H A Dbsd.opts.mkdiff 4f81c42fbd76e25c9fe696fa08296b79c55fbf09 Thu Aug 21 16:06:34 CEST 2025 Mark Johnston <markj@FreeBSD.org> share/mk: Substitute reproducible prefixes in dwarf info

Ensure that worlds/releases built from different source paths are
reproducible. Currently they are not since src and obj paths are
embedded in DWARF info. There are some uses of __FILE__ in the src tree
as well, and they are similarly handled by this change.

Use /usr/src and /usr/obj as the canonical src and obj paths when
WITH_REPRODUCIBLE_BUILD is defined. Define a DEBUG_PREFIX variable
which is used to ask the compiler to substitute paths in output files
using -ffile-prefix-map.

Compat builds (i.e., lib32) complicate things since they override
OBJROOT to point to obj-${compat} but still refer to headers from the
native objroot (e.g., llvm headers).

MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D50951