diff options
| -rw-r--r-- | Config.in | 2 | ||||
| -rw-r--r-- | toolchain/toolchain-wrapper.c | 75 |
2 files changed, 75 insertions, 2 deletions
@@ -712,6 +712,8 @@ config BR2_COMPILER_PARANOID_UNSAFE_PATH config BR2_REPRODUCIBLE bool "Make the build reproducible (experimental)" + # SOURCE_DATE_EPOCH support in toolchain-wrapper requires GCC 4.4 + depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_4 help This option will remove all sources of non-reproducibility from the build process. For a given Buildroot configuration, diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c index dd77c11131..2928ea42d0 100644 --- a/toolchain/toolchain-wrapper.c +++ b/toolchain/toolchain-wrapper.c @@ -22,12 +22,19 @@ #include <unistd.h> #include <stdlib.h> #include <errno.h> +#include <time.h> +#include <stdbool.h> #ifdef BR_CCACHE static char ccache_path[PATH_MAX]; #endif static char path[PATH_MAX]; static char sysroot[PATH_MAX]; +/* As would be defined by gcc: + * https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html + * sizeof() on string literals includes the terminating \0. */ +static char _time_[sizeof("-D__TIME__=\"HH:MM:SS\"")]; +static char _date_[sizeof("-D__DATE__=\"MMM DD YYYY\"")]; /** * GCC errors out with certain combinations of arguments (examples are @@ -35,12 +42,15 @@ static char sysroot[PATH_MAX]; * that we only pass the predefined one to the real compiler if the inverse * option isn't in the argument list. * This specifies the worst case number of extra arguments we might pass - * Currently, we have: + * Currently, we may have: * -mfloat-abi= * -march= * -mcpu= + * -D__TIME__= + * -D__DATE__= + * -Wno-builtin-macro-redefined */ -#define EXCLUSIVE_ARGS 3 +#define EXCLUSIVE_ARGS 6 static char *predef_args[] = { #ifdef BR_CCACHE @@ -160,6 +170,60 @@ static void check_unsafe_path(const char *arg, } } +/* Returns false if SOURCE_DATE_EPOCH was not defined in the environment. + * + * Returns true if SOURCE_DATE_EPOCH is in the environment and represent + * a valid timestamp, in which case the timestamp is formatted into the + * global variables _date_ and _time_. + * + * Aborts if SOURCE_DATE_EPOCH was set in the environment but did not + * contain a valid timestamp. + * + * Valid values are defined in the spec: + * https://reproducible-builds.org/specs/source-date-epoch/ + * but we further restrict them to be positive or null. + */ +bool parse_source_date_epoch_from_env(void) +{ + char *epoch_env, *endptr; + time_t epoch; + struct tm epoch_tm; + + if ((epoch_env = getenv("SOURCE_DATE_EPOCH")) == NULL) + return false; + errno = 0; + epoch = (time_t) strtoll(epoch_env, &endptr, 10); + /* We just need to test if it is incorrect, but we do not + * care why it is incorrect. + */ + if ((errno != 0) || !*epoch_env || *endptr || (epoch < 0)) { + fprintf(stderr, "%s: invalid SOURCE_DATE_EPOCH='%s'\n", + program_invocation_short_name, + epoch_env); + exit(1); + } + tzset(); /* For localtime_r(), below. */ + if (localtime_r(&epoch, &epoch_tm) == NULL) { + fprintf(stderr, "%s: cannot parse SOURCE_DATE_EPOCH=%s\n", + program_invocation_short_name, + getenv("SOURCE_DATE_EPOCH")); + exit(1); + } + if (!strftime(_time_, sizeof(_time_), "-D__TIME__=\"%T\"", &epoch_tm)) { + fprintf(stderr, "%s: cannot set time from SOURCE_DATE_EPOCH=%s\n", + program_invocation_short_name, + getenv("SOURCE_DATE_EPOCH")); + exit(1); + } + if (!strftime(_date_, sizeof(_date_), "-D__DATE__=\"%b %e %Y\"", &epoch_tm)) { + fprintf(stderr, "%s: cannot set date from SOURCE_DATE_EPOCH=%s\n", + program_invocation_short_name, + getenv("SOURCE_DATE_EPOCH")); + exit(1); + } + return true; +} + int main(int argc, char **argv) { char **args, **cur, **exec_args; @@ -289,6 +353,13 @@ int main(int argc, char **argv) } #endif /* ARCH || CPU */ + if (parse_source_date_epoch_from_env()) { + *cur++ = _time_; + *cur++ = _date_; + /* This has existed since gcc-4.4.0. */ + *cur++ = "-Wno-builtin-macro-redefined"; + } + paranoid_wrapper = getenv("BR_COMPILER_PARANOID_UNSAFE_PATH"); if (paranoid_wrapper && strlen(paranoid_wrapper) > 0) paranoid = 1; |