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authorMarius Bakke <mbakke@fastmail.com>2017-01-21 12:31:49 +0100
committerMarius Bakke <mbakke@fastmail.com>2017-01-23 20:39:47 +0100
commitd71d6fe85c4db778be6a2081cbbec6a3a494e4f9 (patch)
tree58eec07c3d04c4b710a722f0b9df9427d419d79b /gnu/packages/patches/gcc-5-source-date-epoch-1.patch
parent0e88ada940953ac6b12fcbfd2add08835edcf49d (diff)
downloadguix-d71d6fe85c4db778be6a2081cbbec6a3a494e4f9.tar
guix-d71d6fe85c4db778be6a2081cbbec6a3a494e4f9.tar.gz
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.
Diffstat (limited to 'gnu/packages/patches/gcc-5-source-date-epoch-1.patch')
-rw-r--r--gnu/packages/patches/gcc-5-source-date-epoch-1.patch190
1 files changed, 190 insertions, 0 deletions
diff --git a/gnu/packages/patches/gcc-5-source-date-epoch-1.patch b/gnu/packages/patches/gcc-5-source-date-epoch-1.patch
new file mode 100644
index 0000000000..8c94a026b3
--- /dev/null
+++ b/gnu/packages/patches/gcc-5-source-date-epoch-1.patch
@@ -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
+