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gnu: gcc@5: Respect SOURCE_DATE_EPOCH in __DATE__ and __TIME__ macros. 

* gnu/packages/patches/gcc-5-source-date-epoch-1.patch,
  gnu/packages/patches/gcc-5-source-date-epoch-2.patch: New files.
* gnu/local.mk (dist_patch_DATA): Register them.
* gnu/packages/gcc.scm (gcc-5)[source]: Use them.
master
Marius Bakke 2017-01-21 12:31:49 +01:00
parent 0e88ada940
commit d71d6fe85c
No known key found for this signature in database
GPG Key ID: A2A06DF2A33A54FA
4 changed files with 548 additions and 1 deletions
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2
gnu/local.mk
View File

@ -561,6 +561,8 @@ dist_patch_DATA = \
%D%/packages/patches/gcc-strmov-store-file-names.patch \ %D%/packages/patches/gcc-strmov-store-file-names.patch \
%D%/packages/patches/gcc-4.9.3-mingw-gthr-default.patch \ %D%/packages/patches/gcc-4.9.3-mingw-gthr-default.patch \
%D%/packages/patches/gcc-5.0-libvtv-runpath.patch \ %D%/packages/patches/gcc-5.0-libvtv-runpath.patch \
%D%/packages/patches/gcc-5-source-date-epoch-1.patch \
%D%/packages/patches/gcc-5-source-date-epoch-2.patch \
%D%/packages/patches/gcc-6-arm-none-eabi-multilib.patch \ %D%/packages/patches/gcc-6-arm-none-eabi-multilib.patch \
%D%/packages/patches/gcc-6-cross-environment-variables.patch \ %D%/packages/patches/gcc-6-cross-environment-variables.patch \
%D%/packages/patches/gcj-arm-mode.patch \ %D%/packages/patches/gcj-arm-mode.patch \

4
gnu/packages/gcc.scm
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@ -376,7 +376,9 @@ Go. It also includes runtime support libraries for these languages.")
"0fihlcy5hnksdxk0sn6bvgnyq8gfrgs8m794b1jxwd1dxinzg3b0")) "0fihlcy5hnksdxk0sn6bvgnyq8gfrgs8m794b1jxwd1dxinzg3b0"))
(patches (search-patches "gcc-arm-bug-71399.patch" (patches (search-patches "gcc-arm-bug-71399.patch"
"gcc-strmov-store-file-names.patch" "gcc-strmov-store-file-names.patch"
"gcc-5.0-libvtv-runpath.patch")))))) "gcc-5.0-libvtv-runpath.patch"
"gcc-5-source-date-epoch-1.patch"
"gcc-5-source-date-epoch-2.patch"))))))
(define-public gcc-6 (define-public gcc-6
(package (package

190
gnu/packages/patches/gcc-5-source-date-epoch-1.patch 100644
View File

@ -0,0 +1,190 @@
Make GCC respect SOURCE_DATE_EPOCH in __DATE__ and __TIME__ macros.
Patch adapted from upstream source repository:
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=e3e8c48c4a494d9da741c1c8ea6c4c0b7c4ff934
From e3e8c48c4a494d9da741c1c8ea6c4c0b7c4ff934 Mon Sep 17 00:00:00 2001
From: doko <doko@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 28 Apr 2016 09:12:05 +0000
Subject: [PATCH] gcc/c-family/ChangeLog:
diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 1bf5d080034..6f0898a38d7 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -12318,4 +12318,37 @@ pointer_to_zero_sized_aggr_p (tree t)
return (TYPE_SIZE (t) && integer_zerop (TYPE_SIZE (t)));
}
+/* 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 ()
+{
+ char *source_date_epoch;
+ long long epoch;
+ char *endptr;
+
+ source_date_epoch = getenv ("SOURCE_DATE_EPOCH");
+ if (!source_date_epoch)
+ return (time_t) -1;
+
+ 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);
+
+ return (time_t) epoch;
+}
+
#include "gt-c-family-c-common.h"
diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h
index fdb227f85c3..ba0a5d7df50 100644
--- a/gcc/c-family/c-common.h
+++ b/gcc/c-family/c-common.h
@@ -1437,4 +1437,10 @@ extern bool contains_cilk_spawn_stmt (tree);
extern tree cilk_for_number_of_iterations (tree);
extern bool check_no_cilk (tree, const char *, const char *,
location_t loc = UNKNOWN_LOCATION);
+
+/* 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 bb55be8063e..e68471b9d2b 100644
--- a/gcc/c-family/c-lex.c
+++ b/gcc/c-family/c-lex.c
@@ -402,6 +402,9 @@ 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 100811dc637..3b5317beb53 100644
--- a/gcc/doc/cppenv.texi
+++ b/gcc/doc/cppenv.texi
@@ -79,4 +79,21 @@ main input file is omitted.
@ifclear cppmanual
@xref{Preprocessor Options}.
@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
+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}}.
+
+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
+process.
+
@end vtable
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 1b731d1a3ad..7a5481219be 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -775,6 +775,9 @@ 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 45a4d13ffa3..a8d00f4628b 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -530,6 +530,13 @@ 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 ENABLE_CHECKING
diff --git a/libcpp/internal.h b/libcpp/internal.h
index c2d08168945..8507eba1747 100644
--- a/libcpp/internal.h
+++ b/libcpp/internal.h
@@ -502,6 +502,10 @@ struct cpp_reader
const unsigned char *date;
const unsigned char *time;
+ /* Externally set timestamp to replace current date and time useful for
+ reproducibility. */
+ time_t source_date_epoch;
+
/* EOF token, and a token forcing paste avoidance. */
cpp_token avoid_paste;
cpp_token eof;
diff --git a/libcpp/macro.c b/libcpp/macro.c
index eb32a6f8c98..3f3b278e97d 100644
--- a/libcpp/macro.c
+++ b/libcpp/macro.c
@@ -350,13 +350,20 @@ _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node)
time_t tt;
struct tm *tb = NULL;
- /* (time_t) -1 is a legitimate value for "number of seconds
- since the Epoch", so we have to do a little dance to
- distinguish that from a genuine error. */
- errno = 0;
- tt = time(NULL);
- if (tt != (time_t)-1 || errno == 0)
- tb = localtime (&tt);
+ /* 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);
+ else
+ {
+ /* (time_t) -1 is a legitimate value for "number of seconds
+ since the Epoch", so we have to do a little dance to
+ distinguish that from a genuine error. */
+ errno = 0;
+ tt = time (NULL);
+ if (tt != (time_t)-1 || errno == 0)
+ tb = localtime (&tt);
+ }
if (tb)
{
--
2.11.0

353
gnu/packages/patches/gcc-5-source-date-epoch-2.patch 100644
View File

@ -0,0 +1,353 @@
Continuation of the SOURCE_DATE_EPOCH patch.
Patch adapted from upstream source repository:
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=dfa5c0d3f3e23e4fdb14857a42de376d9ff8601c
From dfa5c0d3f3e23e4fdb14857a42de376d9ff8601c Mon Sep 17 00:00:00 2001
From: doko <doko@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 1 Jun 2016 16:42:41 +0000
Subject: [PATCH] gcc/c-family/ChangeLog:
diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 6f0898a38d7..efbc78ef218 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -12321,8 +12321,9 @@ pointer_to_zero_sized_aggr_p (tree t)
/* 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;
@@ -12334,19 +12335,14 @@ 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 ba0a5d7df50..977ae9df5ea 100644
--- a/gcc/c-family/c-common.h
+++ b/gcc/c-family/c-common.h
@@ -1063,6 +1063,16 @@ extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
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 *);
@@ -1438,9 +1448,4 @@ extern tree cilk_for_number_of_iterations (tree);
extern bool check_no_cilk (tree, const char *, const char *,
location_t loc = UNKNOWN_LOCATION);
-/* 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 e68471b9d2b..3f78073f640 100644
--- a/gcc/c-family/c-lex.c
+++ b/gcc/c-family/c-lex.c
@@ -97,6 +97,7 @@ 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
@@ -402,9 +403,6 @@ 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 3b5317beb53..7b4cf6adc11 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 d956c36b151..2709f295734 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -3328,6 +3328,29 @@ 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. */
@@ -3628,6 +3651,7 @@ 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 4fa433d9954..7656b2254a1 100644
--- a/gcc/testsuite/lib/gcc-dg.exp
+++ b/gcc/testsuite/lib/gcc-dg.exp
@@ -324,6 +324,38 @@ 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.
#
@@ -785,6 +817,11 @@ 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
+ }
unset_timeout_vars
if [info exists compiler_conditional_xfail_data] {
unset compiler_conditional_xfail_data
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 7a5481219be..867aeebc39f 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -585,6 +585,9 @@ 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
@@ -775,9 +778,6 @@ 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 a8d00f4628b..61c9bbbf945 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -254,6 +254,9 @@ 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);
@@ -530,13 +533,6 @@ 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 ENABLE_CHECKING
diff --git a/libcpp/internal.h b/libcpp/internal.h
index 8507eba1747..226ae328e76 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 3f3b278e97d..756c7c6e0c6 100644
--- a/libcpp/macro.c
+++ b/libcpp/macro.c
@@ -351,9 +351,13 @@ _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
--
2.11.0