Cherry-picked from upstream commit: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=dfa5c0d3f3e23e4fdb14857a42de376d9ff8601c diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c index b5daea65ba7..a4539da15ce 100644 --- a/gcc/c-family/c-common.c +++ b/gcc/c-family/c-common.c @@ -12753,8 +12753,9 @@ valid_array_size_p (location_t loc, tree type, tree name) /* Read SOURCE_DATE_EPOCH from environment to have a deterministic timestamp to replace embedded current dates to get reproducible results. Returns -1 if SOURCE_DATE_EPOCH is not defined. */ + time_t -get_source_date_epoch () +cb_get_source_date_epoch (cpp_reader *pfile ATTRIBUTE_UNUSED) { char *source_date_epoch; long long epoch; @@ -12766,19 +12767,14 @@ get_source_date_epoch () errno = 0; epoch = strtoll (source_date_epoch, &endptr, 10); - if ((errno == ERANGE && (epoch == LLONG_MAX || epoch == LLONG_MIN)) - || (errno != 0 && epoch == 0)) - fatal_error (UNKNOWN_LOCATION, "environment variable $SOURCE_DATE_EPOCH: " - "strtoll: %s\n", xstrerror(errno)); - if (endptr == source_date_epoch) - fatal_error (UNKNOWN_LOCATION, "environment variable $SOURCE_DATE_EPOCH: " - "no digits were found: %s\n", endptr); - if (*endptr != '\0') - fatal_error (UNKNOWN_LOCATION, "environment variable $SOURCE_DATE_EPOCH: " - "trailing garbage: %s\n", endptr); - if (epoch < 0) - fatal_error (UNKNOWN_LOCATION, "environment variable $SOURCE_DATE_EPOCH: " - "value must be nonnegative: %lld \n", epoch); + if (errno != 0 || endptr == source_date_epoch || *endptr != '\0' + || epoch < 0 || epoch > MAX_SOURCE_DATE_EPOCH) + { + error_at (input_location, "environment variable SOURCE_DATE_EPOCH must " + "expand to a non-negative integer less than or equal to %wd", + MAX_SOURCE_DATE_EPOCH); + return (time_t) -1; + } return (time_t) epoch; } diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h index c6e0ed12b55..44699f716e0 100644 --- a/gcc/c-family/c-common.h +++ b/gcc/c-family/c-common.h @@ -1084,6 +1084,16 @@ extern vec *make_tree_vector_copy (const vec *); c_register_builtin_type. */ extern GTY(()) tree registered_builtin_types; +/* Read SOURCE_DATE_EPOCH from environment to have a deterministic + timestamp to replace embedded current dates to get reproducible + results. Returns -1 if SOURCE_DATE_EPOCH is not defined. */ +extern time_t cb_get_source_date_epoch (cpp_reader *pfile); + +/* The value (as a unix timestamp) corresponds to date + "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and + __TIME__ can store. */ +#define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799) + /* In c-gimplify.c */ extern void c_genericize (tree); extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *); @@ -1467,9 +1477,4 @@ extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION); extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec **); extern bool valid_array_size_p (location_t, tree, tree); -/* Read SOURCE_DATE_EPOCH from environment to have a deterministic - timestamp to replace embedded current dates to get reproducible - results. Returns -1 if SOURCE_DATE_EPOCH is not defined. */ -extern time_t get_source_date_epoch (void); - #endif /* ! GCC_C_COMMON_H */ diff --git a/gcc/c-family/c-lex.c b/gcc/c-family/c-lex.c index bf1db6c0252..42a4135d339 100644 --- a/gcc/c-family/c-lex.c +++ b/gcc/c-family/c-lex.c @@ -80,6 +80,7 @@ init_c_lex (void) cb->valid_pch = c_common_valid_pch; cb->read_pch = c_common_read_pch; cb->has_attribute = c_common_has_attribute; + cb->get_source_date_epoch = cb_get_source_date_epoch; /* Set the debug callbacks if we can use them. */ if ((debug_info_level == DINFO_LEVEL_VERBOSE @@ -385,9 +386,6 @@ c_lex_with_flags (tree *value, location_t *loc, unsigned char *cpp_flags, enum cpp_ttype type; unsigned char add_flags = 0; enum overflow_type overflow = OT_NONE; - time_t source_date_epoch = get_source_date_epoch (); - - cpp_init_source_date_epoch (parse_in, source_date_epoch); timevar_push (TV_CPP); retry: diff --git a/gcc/doc/cppenv.texi b/gcc/doc/cppenv.texi index e958e93e97e..8cefd529aa3 100644 --- a/gcc/doc/cppenv.texi +++ b/gcc/doc/cppenv.texi @@ -81,7 +81,6 @@ main input file is omitted. @end ifclear @item SOURCE_DATE_EPOCH - If this variable is set, its value specifies a UNIX timestamp to be used in replacement of the current date and time in the @code{__DATE__} and @code{__TIME__} macros, so that the embedded timestamps become @@ -89,8 +88,9 @@ reproducible. The value of @env{SOURCE_DATE_EPOCH} must be a UNIX timestamp, defined as the number of seconds (excluding leap seconds) since -01 Jan 1970 00:00:00 represented in ASCII, identical to the output of -@samp{@command{date +%s}}. +01 Jan 1970 00:00:00 represented in ASCII; identical to the output of +@samp{@command{date +%s}} on GNU/Linux and other systems that support the +@code{%s} extension in the @code{date} command. The value should be a known timestamp such as the last modification time of the source or package and it should be set by the build diff --git a/gcc/gcc.c b/gcc/gcc.c index cfa074d4e43..f88596219bc 100644 --- a/gcc/gcc.c +++ b/gcc/gcc.c @@ -3541,6 +3541,29 @@ save_switch (const char *opt, size_t n_args, const char *const *args, n_switches++; } +/* Set the SOURCE_DATE_EPOCH environment variable to the current time if it is + not set already. */ + +static void +set_source_date_epoch_envvar () +{ + /* Array size is 21 = ceil(log_10(2^64)) + 1 to hold string representations + of 64 bit integers. */ + char source_date_epoch[21]; + time_t tt; + + errno = 0; + tt = time (NULL); + if (tt < (time_t) 0 || errno != 0) + tt = (time_t) 0; + + snprintf (source_date_epoch, 21, "%llu", (unsigned long long) tt); + /* Using setenv instead of xputenv because we want the variable to remain + after finalizing so that it's still set in the second run when using + -fcompare-debug. */ + setenv ("SOURCE_DATE_EPOCH", source_date_epoch, 0); +} + /* Handle an option DECODED that is unknown to the option-processing machinery. */ @@ -3840,6 +3863,7 @@ driver_handle_option (struct gcc_options *opts, else compare_debug_opt = arg; save_switch (compare_debug_replacement_opt, 0, NULL, validated, true); + set_source_date_epoch_envvar (); return true; case OPT_fdiagnostics_color_: diff --git a/gcc/testsuite/gcc.dg/cpp/source_date_epoch-1.c b/gcc/testsuite/gcc.dg/cpp/source_date_epoch-1.c new file mode 100644 index 00000000000..f6aa1a360ff --- /dev/null +++ b/gcc/testsuite/gcc.dg/cpp/source_date_epoch-1.c @@ -0,0 +1,11 @@ +/* { dg-do run } */ +/* { dg-set-compiler-env-var SOURCE_DATE_EPOCH "630333296" } */ + +int +main(void) +{ + __builtin_printf ("%s %s\n", __DATE__, __TIME__); + return 0; +} + +/* { dg-output "^Dec 22 1989 12:34:56\n$" } */ diff --git a/gcc/testsuite/gcc.dg/cpp/source_date_epoch-2.c b/gcc/testsuite/gcc.dg/cpp/source_date_epoch-2.c new file mode 100644 index 00000000000..ae18362ae87 --- /dev/null +++ b/gcc/testsuite/gcc.dg/cpp/source_date_epoch-2.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-set-compiler-env-var SOURCE_DATE_EPOCH "AAA" } */ + +/* Make sure that SOURCE_DATE_EPOCH is only parsed once */ + +int +main(void) +{ + __builtin_printf ("%s %s\n", __DATE__, __TIME__); /* { dg-error "SOURCE_DATE_EPOCH must expand" } */ + __builtin_printf ("%s %s\n", __DATE__, __TIME__); + return 0; +} diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp index 9dd909b0985..822d2fbb3b9 100644 --- a/gcc/testsuite/lib/gcc-dg.exp +++ b/gcc/testsuite/lib/gcc-dg.exp @@ -450,6 +450,38 @@ proc restore-target-env-var { } { } } +proc dg-set-compiler-env-var { args } { + global set_compiler_env_var + global saved_compiler_env_var + if { [llength $args] != 3 } { + error "dg-set-compiler-env-var: need two arguments" + return + } + set var [lindex $args 1] + set value [lindex $args 2] + if [info exists ::env($var)] { + lappend saved_compiler_env_var [list $var 1 $::env($var)] + } else { + lappend saved_compiler_env_var [list $var 0] + } + setenv $var $value + lappend set_compiler_env_var [list $var $value] +} + +proc restore-compiler-env-var { } { + global saved_compiler_env_var + for { set env_vari [llength $saved_compiler_env_var] } { + [incr env_vari -1] >= 0 } {} { + set env_var [lindex $saved_compiler_env_var $env_vari] + set var [lindex $env_var 0] + if [lindex $env_var 1] { + setenv $var [lindex $env_var 2] + } else { + unsetenv $var + } + } +} + # Utility routines. # @@ -873,6 +905,11 @@ if { [info procs saved-dg-test] == [list] } { if [info exists set_target_env_var] { unset set_target_env_var } + if [info exists set_compiler_env_var] { + restore-compiler-env-var + unset set_compiler_env_var + unset saved_compiler_env_var + } if [info exists keep_saved_temps_suffixes] { unset keep_saved_temps_suffixes } diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h index 4998b3a8ab8..9d70cc856ef 100644 --- a/libcpp/include/cpplib.h +++ b/libcpp/include/cpplib.h @@ -594,6 +594,9 @@ struct cpp_callbacks /* Callback that can change a user builtin into normal macro. */ bool (*user_builtin_macro) (cpp_reader *, cpp_hashnode *); + + /* Callback to parse SOURCE_DATE_EPOCH from environment. */ + time_t (*get_source_date_epoch) (cpp_reader *); }; #ifdef VMS @@ -784,9 +787,6 @@ extern void cpp_init_special_builtins (cpp_reader *); /* Set up built-ins like __FILE__. */ extern void cpp_init_builtins (cpp_reader *, int); -/* Initialize the source_date_epoch value. */ -extern void cpp_init_source_date_epoch (cpp_reader *, time_t); - /* This is called after options have been parsed, and partially processed. */ extern void cpp_post_options (cpp_reader *); diff --git a/libcpp/init.c b/libcpp/init.c index f5ff85b3bae..e78b3206def 100644 --- a/libcpp/init.c +++ b/libcpp/init.c @@ -257,6 +257,9 @@ cpp_create_reader (enum c_lang lang, cpp_hash_table *table, /* Do not force token locations by default. */ pfile->forced_token_location_p = NULL; + /* Initialize source_date_epoch to -2 (not yet set). */ + pfile->source_date_epoch = (time_t) -2; + /* The expression parser stack. */ _cpp_expand_op_stack (pfile); @@ -533,13 +536,6 @@ cpp_init_builtins (cpp_reader *pfile, int hosted) _cpp_define_builtin (pfile, "__OBJC__ 1"); } -/* Initialize the source_date_epoch value. */ -void -cpp_init_source_date_epoch (cpp_reader *pfile, time_t source_date_epoch) -{ - pfile->source_date_epoch = source_date_epoch; -} - /* Sanity-checks are dependent on command-line options, so it is called as a subroutine of cpp_read_main_file. */ #if CHECKING_P diff --git a/libcpp/internal.h b/libcpp/internal.h index e3eb26b1f27..cea32ec73c6 100644 --- a/libcpp/internal.h +++ b/libcpp/internal.h @@ -503,7 +503,8 @@ struct cpp_reader const unsigned char *time; /* Externally set timestamp to replace current date and time useful for - reproducibility. */ + reproducibility. It should be initialized to -2 (not yet set) and + set to -1 to disable it or to a non-negative value to enable it. */ time_t source_date_epoch; /* EOF token, and a token forcing paste avoidance. */ diff --git a/libcpp/macro.c b/libcpp/macro.c index c2a83764660..a3b8348a23f 100644 --- a/libcpp/macro.c +++ b/libcpp/macro.c @@ -358,9 +358,13 @@ _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node, struct tm *tb = NULL; /* Set a reproducible timestamp for __DATE__ and __TIME__ macro - usage if SOURCE_DATE_EPOCH is defined. */ - if (pfile->source_date_epoch != (time_t) -1) - tb = gmtime (&pfile->source_date_epoch); + if SOURCE_DATE_EPOCH is defined. */ + if (pfile->source_date_epoch == (time_t) -2 + && pfile->cb.get_source_date_epoch != NULL) + pfile->source_date_epoch = pfile->cb.get_source_date_epoch (pfile); + + if (pfile->source_date_epoch >= (time_t) 0) + tb = gmtime (&pfile->source_date_epoch); else { /* (time_t) -1 is a legitimate value for "number of seconds -- 2.14.1