infra: add force build flag for host dependencies

This commit adds a config option which will force buildroot to
build all host dependencies even if they are already present on the
host system. This may be a desirable option if different hosts are
used to build the same source. In this case, some packages will be
built on one host that are not built on another. This is problematic
if build source archives are cached afterwards for offline builds.

Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Bryce Ferguson <bryce.ferguson@rockwellcollins.com>
Signed-off-by: Matt Weber <matthew.weber@rockwellcollins.com>
[Peter: reword, drop exit 1, reshuffle]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/Config.in b/Config.in
index f965e9d6d8..d58d8dc04a 100644
--- a/Config.in
+++ b/Config.in
@@ -677,6 +677,18 @@ config BR2_COMPILER_PARANOID_UNSAFE_PATH
 	  and external toolchain backends (through the toolchain
 	  wrapper).
 
+config BR2_FORCE_HOST_BUILD
+	bool "Force the building of host dependencies"
+	help
+	  Build all available host dependencies, even if they are
+	  already installed on the system.
+
+	  This option can be used to ensure that the download cache of
+	  source archives for packages remain consistent between
+	  different build hosts.
+
+	  This option will increase build time.
+
 config BR2_REPRODUCIBLE
 	bool "Make the build reproducible (experimental)"
 	# SOURCE_DATE_EPOCH support in toolchain-wrapper requires GCC 4.4