https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71183
Bug ID: 71183
Summary: gcc -E always gives __DATE__ and __TIME__ as Jan 1
1970 00:00:00
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: jrtc27 at jrtc27 dot com
Target Milestone: ---
The inclusion of the SOURCE_DATE_EPOCH patch (SVN revision 235550) broke
__DATE__ and __TIME__ when running the preprocessor on its own, as
pfile->source_date_epoch is only initialised in c_lex_with_flags, so
pfile->source_date_epoch is 0 when _cpp_builtin_macro_text is called, rather
than -1 (telling it to use the current time) or the true value of
SOURCE_DATE_EPOCH.
$ echo '__DATE__ __TIME__' | gcc -E -
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "<stdin>"
"Jan 1 1970" "00:00:00"
