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q3rcc: Allow to override build date

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Allow to override __DATE__ and __TIME__ with SOURCE_DATE_EPOCH
in order to make builds reproducible.
See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

This behavior is what gcc already does.
This commit is contained in:
Bernhard M. Wiedemann 2019-07-10 17:17:37 +02:00 committed by Tim Angus
parent 350b8f9c7c
commit a96f32eba2
1 changed files with 10 additions and 1 deletions
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11
code/tools/lcc/cpp/cpp.c
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@ -19,6 +19,15 @@ int ifdepth;
int ifsatisfied[NIF]; int ifsatisfied[NIF];
int skipping; int skipping;
time_t reproducible_time()
{
char *source_date_epoch;
time_t t;
if ((source_date_epoch = getenv("SOURCE_DATE_EPOCH")) == NULL ||
(t = (time_t)strtol(source_date_epoch, NULL, 10)) <= 0)
return time(NULL);
return t;
}
int int
main(int argc, char **argv) main(int argc, char **argv)
@ -28,7 +37,7 @@ main(int argc, char **argv)
char ebuf[BUFSIZ]; char ebuf[BUFSIZ];
setbuf(stderr, ebuf); setbuf(stderr, ebuf);
t = time(NULL); t = reproducible_time();
curtime = ctime(&t); curtime = ctime(&t);
maketokenrow(3, &tr); maketokenrow(3, &tr);
expandlex(); expandlex();