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In GCC6 the compiler was made smarter to omit the flag -fdebug-prefix-map from the DWARF DW_AT_producer section[1]. That flag contains the absolute path '$(BASE_DIR)' which breaks reproducibility. Prior to GCC6 however, the only way to omit the flag is to use -gno-record-gcc-switches which omits all flags. [1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=266cc0c181549c2fb6b50f8f26213cdc89101026 Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com> [Arnout: invert condition to ifeq (,) instead of ifneq (,y)] Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>