@@ -93,3 +93,5 @@ python do_addto_recipe_sysroot () {
}
addtask addto_recipe_sysroot after do_populate_sysroot
do_addto_recipe_sysroot[deptask] = "do_populate_sysroot"
+
+PATH:prepend = "${COREBASE}/scripts/cross-intercept:"
new file mode 120000
@@ -0,0 +1 @@
+../native-intercept/ar
\ No newline at end of file
new file mode 100755
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+#
+# Wrapper around 'ar' that defaults to deterministic archives
+
+import os
+import shutil
+import sys
+
+# calculate path to the real 'ar'
+path = os.environ['PATH']
+path = path.replace(os.path.dirname(sys.argv[0]), '')
+real_ar = shutil.which('ar', path=path)
+
+if len(sys.argv) == 1:
+ os.execl(real_ar, 'ar')
+
+# modify args to mimic 'ar' configured with --default-deterministic-archives
+argv = sys.argv
+if argv[1].startswith('--'):
+ # No modifier given
+ None
+else:
+ # remove the optional '-'
+ if argv[1][0] == '-':
+ argv[1] = argv[1][1:]
+ if 'U' in argv[1]:
+ sys.stderr.write("ar: non-deterministic mode requested\n")
+ else:
+ argv[1] = argv[1].replace('u', '')
+ argv[1] = 'D' + argv[1]
+
+os.execv(real_ar, argv)
Add a wrapper around ar calls for native/cross recipes. This wrapper adds the -D option so that deterministic archives are built for native/cross output. This improves the changes of hash equivalence matches and hence build artefact reuse. We don't need this in the target case since we compile binutils-cross with an option making this the default. We need a wrapper since we need to remove the "u" option and replace it with "D" but also allow things like "--version" to continue to work too. Signed-off-by: Jacob Kroon <jacob.kroon@gmail.com> --- Changes in v2: * Don't modify arguments if 'U' is given, instead print a message to stderr that non-deterministic mode is requested meta/classes/cross.bbclass | 2 ++ scripts/cross-intercept/ar | 1 + scripts/native-intercept/ar | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 35 insertions(+) create mode 120000 scripts/cross-intercept/ar create mode 100755 scripts/native-intercept/ar