Are the two different sets of object files available somewhere for download and inspection? I could take a look and see if I can spot the difference, but I need the files.
Alex On Tue, 21 Feb 2023 at 17:47, Sundeep KOKKONDA <sundeep.kokko...@windriver.com> wrote: > > Hello, > > The rust builds are not reproducible when the build path is changed. The > issue details are in https://bugzilla.yoctoproject.org/show_bug.cgi?id=14875. > > After debugging several ways, we tried to find at what build stage the Yocto > build artifacts are deviating with rust sources generated artifacts. > > I took the identical rust tarball sources (rustc-1.67.0-src.tar.xz) as Yocto > rust sources and built in two different paths (buildA & buildB directories). > In the rust sources the generated binaries are identical between 2 different > builds. > > But, In Yocto we found that the binaries > '../tmp/work/x86_64-linux/rust-native/1.67.0-r0/recipe-sysroot-native/usr/lib/llvm-rust/lib/libLTO.so > & libRemarks.so' are differed between 2 builds. See the differences in the > attached 'libLTO-diff.png'. > > And these objects are passed to compile all rust crates in later build stages > (with option '-L > native=/ala-lpggp31/skokkonda/875/poky/buildC/tmp/work/x86_64-linux/rust-native/1.67.0-r0/recipe-sysroot-native/usr/lib/llvm-rust/lib'). > > So, we suspect this could be the reason for this reproducibility issue in > Yocto. I tried to find the reason for difference in these binaries but the > '-vv' build log doesn't give enough info by linking which objects this > libLTO.so is generated. I tried the disassembly of object files generated in > ../x86_64-linux/rust-native/ but that didn't showup these binary differences. > > Anyone who has expertise with rust-llvm can guide me here on how these *.so > are generating and how to understand/fix these differences. > > > > Thanks, > Sundeep K. > > >
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