git: 0b298e314a8b - main - Makefile.inc1: Fix INSTALLEXTRAKERNELS for one-kernel case

The branch main has been updated by ivy:

URL: https://cgit.FreeBSD.org/src/commit/?id=0b298e314a8b47c1f2bf8a9ff86c050accbd744d

commit 0b298e314a8b47c1f2bf8a9ff86c050accbd744d
Author:     Lexi Winter <ivy@FreeBSD.org>
AuthorDate: 2026-01-06 01:48:04 +0000
Commit:     Lexi Winter <ivy@FreeBSD.org>
CommitDate: 2026-01-06 01:48:04 +0000

    Makefile.inc1: Fix INSTALLEXTRAKERNELS for one-kernel case
    
    If BUILDKERNELS contains a single kernel, and NO_INSTALLEXTRAKERNELS=no,
    then ${BUILDKERNELS:[2..-1]} returns the first kernel in the list and
    that kernel ends up in both INSTALLKERNEL and INSTALLEXTRAKERNELS.
    
    This breaks the package build because it means we generate that package
    twice, once with an incorrect install path of /boot/kernel.NAME instead
    of /boot/kernel.
    
    Only set INSTALLEXTRAKERNELS if we're building at least two kernels.
    
    Fixes:  2c0e9a76c1ce ("Makefile.inc1: Make NO_INSTALLKERNEL less of a hack")
    Reviewed by:    jrtc27
    Sponsored by:   https://www.patreon.com/bsdivy
    Differential Revision:  https://reviews.freebsd.org/D54539
---
 Makefile.inc1 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Makefile.inc1 b/Makefile.inc1
index b8f59686784d..5005e4e0acc7 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -1844,10 +1844,12 @@ NO_INSTALLEXTRAKERNELS?=	no
 .if ${NO_INSTALLEXTRAKERNELS} != "yes"
 .if defined(NO_INSTALLKERNEL)
 INSTALLEXTRAKERNELS=	${BUILDKERNELS}
-.else
+.elif ${BUILDKERNELS:[#]} > 1
 # First kernel is installed separately by INSTALLKERNEL, typically to
 # /boot/kernel, rather than to a config-suffixed directory.
 INSTALLEXTRAKERNELS=	${BUILDKERNELS:[2..-1]}
+.else
+INSTALLEXTRAKERNELS=
 .endif
 .endif