On 03.08.2017 3:06, Ximin Luo wrote:
Jeff Law:
On 07/21/2017 10:15 AM, Ximin Luo wrote:
(Please keep me on CC, I am not subscribed)
Proposal
========
This patch series adds a new environment variable BUILD_PATH_PREFIX_MAP. When
this is set, GCC will treat this as extra implicit "-fdebug-prefix-map=$value"
command-line arguments that precede any explicit ones. This makes the final
binary output reproducible, and also hides the unreproducible value (the source
path prefixes) from CFLAGS et. al. which many build tools (understandably)
embed as-is into their build output.
I'd *really* avoid doing this with magic environment variables. Make it
a first class option to the compiler. Yes, it means projects that want
this behavior have to arrange to pass that flag to their compiler, but
IMHO that's much preferred over environment variables.
Jeff
Hi Jeff,
If by "first class option" you meant a command-line flag, GCC *already has* that
(-fdebug-prefix-map) > and it wasn't enough to achieve reproducibility in many cases we
tested.
Shouldn't -fdebug-prefix-map be updated to use the same syntax as
BUILD_PATH_PREFIX_MAP?
-Y
