[OE-core] [PATCH] perl: Set build date to SOURCE_DATE_EPOCH

[Richard Purdie]

On Thu, 2019-05-30 at 13:49 -0500, Joshua Watt wrote:
> Perl uses an internal #define called PERL_BUILD_DATE as the string for
> the date when perl was built. If undefined, it defaults to using
> __DATE__ and __TIME__, which is not reproducible. If SOURCE_DATE_EPOCH
> is set at do_configure time, use it to generate a reproducible string
> for PERL_BUILD_DATE.
> 
> Signed-off-by: Joshua Watt <JPEWhacker at gmail.com>
> ---
>  meta/recipes-devtools/perl-sanity/perl_5.28.2.bb | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/meta/recipes-devtools/perl-sanity/perl_5.28.2.bb b/meta/recipes-devtools/perl-sanity/perl_5.28.2.bb
> index f175e87a12e..b74acfbbc4d 100644
> --- a/meta/recipes-devtools/perl-sanity/perl_5.28.2.bb
> +++ b/meta/recipes-devtools/perl-sanity/perl_5.28.2.bb
> @@ -34,7 +34,7 @@ S = "${WORKDIR}/perl-${PV}"
>  
>  inherit upstream-version-is-even
>  
> -DEPENDS += "db gdbm zlib virtual/crypt"
> +DEPENDS += "db gdbm zlib virtual/crypt coreutils-native"
>  
>  PERL_LIB_VER = "${@'.'.join(d.getVar('PV').split('.')[0:2])}.0"
>  
> @@ -90,6 +90,12 @@ do_configure_class-native() {
>      -Ui_xlocale
>  }
>  
> +do_configure_append() {
> +    if [ -n "$SOURCE_DATE_EPOCH" ]; then
> +        echo "#define PERL_BUILD_DATE \"$(date --utc --date="@$SOURCE_DATE_EPOCH")\"" >> config.h
> +    fi
> +}
> +

As discussed on irc, lets see if we can avoid a coreutils-native
dependency and use python to do the conversion (or similar).

Cheers,

Richard