Pahole v1.27 added a new BTF generation feature to support
reproducibility in the face of multithreading.
Enable it if supported and reproducible builds are requested.
As unknown --btf_features are ignored, avoid the test for the pahole
version to keep the line readable.
Fixes: b4f72786429c ("scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.")
Fixes: 72d091846de9 ("kbuild: avoid too many execution of scripts/pahole-flags.sh")
Link: https://lore.kernel.org/lkml/4154d202-5c72-493e-bf3f-bce882a296c6@xxxxxxxxxx/
Link: https://lore.kernel.org/lkml/20240322-pahole-reprodicible-v1-1-3eaafb1842da@xxxxxxxxxxxxxx/
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
---
scripts/Makefile.btf | 1 +
1 file changed, 1 insertion(+)
diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf
index c3cbeb13de503555adcf00029a0b328e74381f13..da23265bc8b3cf43c0a1c89fbc4f53815a290e13 100644
--- a/scripts/Makefile.btf
+++ b/scripts/Makefile.btf
@@ -22,6 +22,7 @@ else
# Switch to using --btf_features for v1.26 and later.
pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j$(JOBS) --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,decl_tag_kfuncs
+pahole-flags-$(if $(KBUILD_BUILD_TIMESTAMP),y) += --btf_features=reproducible_build
ifneq ($(KBUILD_EXTMOD),)
module-pahole-flags-$(call test-ge, $(pahole-ver), 126) += --btf_features=distilled_base
---
base-commit: 7cb1b466315004af98f6ba6c2546bb713ca3c237
change-id: 20241124-pahole-reproducible-2b879ac8bdab
Best regards,
--
Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
