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guix/gnu/packages/patches/gcc-6-source-date-epoch-2.patch
Marius Bakke aace9be80b
gnu: gcc@6: Respect SOURCE_DATE_EPOCH in __DATE__ and __TIME__ macros. 
* gnu/packages/patches/gcc-6-source-date-epoch-1.patch,
gnu/packages/patches/gcc-6-source-date-epoch-2.patch: New files.
* gnu/local.mk (dist_patch_DATA): Register them.
* gnu/packages/gcc.scm (gcc-6)[source]: Use them.
2017-11-20 00:17:39 +01:00

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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<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 *);
@@ -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<tree> **);
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
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