git: share/mk: Support per-target flags and explicit source mapping

[Aaron LI]

commit f311c5f9fc99ea252fb0b7478706be86f2422043
Author: Aaron LI <aly at aaronly.me>
Date:   Sat Oct 31 17:12:53 2026 +0800

    share/mk: Support per-target flags and explicit source mapping
    
    * Add the "FLAGS.<target>.o" variable to specify per-target flags for
      compiling a library target of all kinds, i.e., <target>.o, <target>.po
      and <target>.So.
    
    * Implement the reusable "_LIB_COMPILE.<ext>" compile rules to support
      explicit source mapping. This is required to support compiling one
      source file into multiple objects with different defines/flags.
    
    The two features are combined to avoid duplicating the explicit compile
    commands in GCC libraries (i.e., libgcc, libgcov, and libatomic).

Summary of changes:
 share/mk/bsd.README | 11 +++++++----
 share/mk/bsd.lib.mk | 30 ++++++++++++++++++++++++++++++
 share/mk/sys.mk     | 10 ++++++----
 3 files changed, 43 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f311c5f9fc99ea252fb0b7478706be86f2422043


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