RFR: 8288396: Always create reproducible builds [v2]

[Erik Joelsson]

On Tue, 14 Jun 2022 10:09:37 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> When we started introducing some possibly more intrusive compiler flags and functionality for reproducible builds, we also introduced a flag to turn this off  out of an abundance of caution. But we have been been using this configuration for a year or so internally within Oracle, with no issues. So there's really no reason to be able to turn this off. (If you were to ask me, the fact that compilers and build tools ever started to produce non-deterministic output has been a bug from day one.)
>> 
>> With this fix, all randomness should be gone from our builds, at least on linux and windows. There are no more `__DATE__` and `__TIME__` macros in the source code.
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix exitTransportWithError signature

make/autoconf/flags-ldflags.m4 line 132:

> 130: 
> 131:   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
> 132:     REPRODUCIBLE_LDFLAGS="-experimental:deterministic"

For the cflag, we check that the compiler supports it, but for the linker flag you are just setting it without a check. Before this patch, if we got here and ENABLE_REPRODUCIBLE_BUILD was true, it meant that the test had passed for the compiler, from which we could assume it would also work for the linker, but that is no longer the case.

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PR: https://git.openjdk.org/jdk/pull/9152