[Buildroot] [PATCH v2 2/2] package/avrdude: fix libserialport dependency

[Yegor Yefremov via buildroot <buildroot@buildroot.org>]

Since version 8.0, avrdude automatically detects and links against
libserialport when it finds it in the sysroot
(find_library(HAVE_LIBSERIALPORT ...) in CMakeLists.txt), and there is
no option to disable it.

Buildroot doesn't declare this dependency, so whether avrdude gets
libserialport support depends on the build order. With
BR2_PACKAGE_LIBSERIALPORT=y, building avrdude before libserialport
gives:

  HAVE_LIBSERIALPORT:FILEPATH=HAVE_LIBSERIALPORT-NOTFOUND

while building libserialport first links avrdude against it. This
makes the build non-reproducible.

Add libserialport to the dependencies when it is enabled, and
otherwise pass -DHAVE_LIBSERIALPORT=OFF, so that find_library() skips
the search and libserialport support is disabled.

This issue has been present since commit 0e16ff09e953
("package/avrdude: bump to version 8.0"), as avrdude 8.0 added
libserialport detection. It therefore affects 2025.05 and later.

Fixes: 0e16ff09e9538d46c9726f8998080d55dfa5d41f ("package/avrdude: bump to version 8.0")
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
---
Changes v1 -> v2:
  - new patch

 package/avrdude/avrdude.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/package/avrdude/avrdude.mk b/package/avrdude/avrdude.mk
index 476f031c99..fbad44a191 100644
--- a/package/avrdude/avrdude.mk
+++ b/package/avrdude/avrdude.mk
@@ -25,6 +25,12 @@ else ifeq ($(BR2_PACKAGE_LIBFTDI),y)
 AVRDUDE_DEPENDENCIES += libftdi
 endif
 
+ifeq ($(BR2_PACKAGE_LIBSERIALPORT),y)
+AVRDUDE_DEPENDENCIES += libserialport
+else
+AVRDUDE_CONF_OPTS += -DHAVE_LIBSERIALPORT=OFF
+endif
+
 ifeq ($(BR2_PACKAGE_HIDAPI),y)
 AVRDUDE_DEPENDENCIES += hidapi
 endif
-- 
2.34.1

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