[PATCH v2] ld: Add --no-print-map-discarded option
Faraz Shahbazker
fshahbazker@wavecomp.com
Tue Apr 2 19:58:00 GMT 2019
Add a new option to disable the listing of discarded sections
in map file output. The use case stems from a large application
built with -ffunction-sections --gc-sections where the list of
discarded sections blows up the map file output. The default
behaviour remains to print discarded sections, but the new option
allows us to disable it.
ld/
* NEWS: Mention new option --no-print-map-discarded.
* ld.h (ld_config_type) <print_map_discarded>: New field.
* ldlang.c (lang_map): Conditionally output discarded sections
in map files based on configuration option.
* ldlex.h (option_values) <OPTION_PRINT_MAP_DISCARDED,
OPTION_NO_PRINT_MAP_DISCARDED>: New.
* ldmain.c (main): Enabled print_map_discarded by default.
* lexsup.c (ld_options): Add new command-line options.
(parse_args) <OPTION_NO_PRINT_MAP_DISCARDED,
OPTION_PRINT_MAP_DISCARDED>: New cases.
* ld.texi: Document new options.
* testsuite/ld-gc/gc.exp: Add new test.
* testsuite/ld-gc/skip-map-discarded.s: New file.
* testsuite/ld-gc/skip-map-discarded.d: New file.
* testsuite/ld-gc/skip-map-discarded.map: New file.
---
This is version 2 of a patch posted for review few months back, but not
committed due to pending copyright assignment. I am told that the FSF
copyright assignment for Wave Computing is now in place. Please review
and commit.
ld/NEWS | 2 ++
ld/ld.h | 3 +++
ld/ld.texi | 8 ++++++++
ld/ldlang.c | 25 +++++++++++++------------
ld/ldlex.h | 2 ++
ld/ldmain.c | 1 +
ld/lexsup.c | 14 ++++++++++++++
ld/testsuite/ld-gc/gc.exp | 2 ++
ld/testsuite/ld-gc/skip-map-discarded.d | 3 +++
ld/testsuite/ld-gc/skip-map-discarded.map | 5 +++++
ld/testsuite/ld-gc/skip-map-discarded.s | 5 +++++
11 files changed, 58 insertions(+), 12 deletions(-)
create mode 100644 ld/testsuite/ld-gc/skip-map-discarded.d
create mode 100644 ld/testsuite/ld-gc/skip-map-discarded.map
create mode 100644 ld/testsuite/ld-gc/skip-map-discarded.s
diff --git a/ld/NEWS b/ld/NEWS
index 597845a..de2cd16 100644
--- b/ld/NEWS
+++ a/ld/NEWS
@@ -1,7 +1,5 @@
-*- text -*-
-* Add command-line option --no-print-map-discarded.
-
Changes in 2.33:
* Add target handlers for AArch64 for ELF GNU program properties.
diff --git a/ld/ld.h b/ld/ld.h
index b97d977..55078a9 100644
--- b/ld/ld.h
+++ a/ld/ld.h
@@ -318,9 +318,6 @@
/* The common page size for ELF. */
bfd_vma commonpagesize;
-
- /* If set, print discarded sections in map file output. */
- bfd_boolean print_map_discarded;
} ld_config_type;
extern ld_config_type config;
diff --git a/ld/ld.texi b/ld/ld.texi
index 0bcbec4..d88bdb4 100644
--- b/ld/ld.texi
+++ a/ld/ld.texi
@@ -783,14 +783,6 @@
is 0x1, and @file{bar.o}, whose 0xc0010001 property value is 0x1.
@end itemize
-@cindex link map discarded
-@kindex --print-map-discarded
-@kindex --no-print-map-discarded
-@item --print-map-discarded
-@itemx --no-print-map-discarded
-Print (or do not print) the list of discarded and garbage collected sections
-in the link map. Enabled by default.
-
@kindex -n
@cindex read-only text
@cindex NMAGIC
diff --git a/ld/ldlang.c b/ld/ldlang.c
index 1952d4a..898735e 100644
--- b/ld/ldlang.c
+++ a/ld/ldlang.c
@@ -2251,20 +2251,19 @@
|| file->flags.just_syms)
continue;
- if (config.print_map_discarded)
- for (s = file->the_bfd->sections; s != NULL; s = s->next)
- if ((s->output_section == NULL
- || s->output_section->owner != link_info.output_bfd)
- && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0)
- {
- if (! dis_header_printed)
- {
- fprintf (config.map_file, _("\nDiscarded input sections\n\n"));
- dis_header_printed = TRUE;
- }
+ for (s = file->the_bfd->sections; s != NULL; s = s->next)
+ if ((s->output_section == NULL
+ || s->output_section->owner != link_info.output_bfd)
+ && (s->flags & (SEC_LINKER_CREATED | SEC_KEEP)) == 0)
+ {
+ if (!dis_header_printed)
+ {
+ fprintf (config.map_file, _("\nDiscarded input sections\n\n"));
+ dis_header_printed = TRUE;
+ }
- print_input_section (s, TRUE);
- }
+ print_input_section (s, TRUE);
+ }
}
minfo (_("\nMemory Configuration\n\n"));
diff --git a/ld/ldlex.h b/ld/ldlex.h
index 32853de..32a7a64 100644
--- b/ld/ldlex.h
+++ a/ld/ldlex.h
@@ -148,8 +148,6 @@
OPTION_REQUIRE_DEFINED_SYMBOL,
OPTION_ORPHAN_HANDLING,
OPTION_FORCE_GROUP_ALLOCATION,
- OPTION_PRINT_MAP_DISCARDED,
- OPTION_NO_PRINT_MAP_DISCARDED,
};
/* The initial parser states. */
diff --git a/ld/ldmain.c b/ld/ldmain.c
index 77cdbd0..da1c6a7 100644
--- b/ld/ldmain.c
+++ a/ld/ldmain.c
@@ -264,7 +264,6 @@
config.make_executable = TRUE;
config.magic_demand_paged = TRUE;
config.text_read_only = TRUE;
- config.print_map_discarded = TRUE;
link_info.disable_target_specific_optimizations = -1;
command_line.warn_mismatch = TRUE;
diff --git a/ld/lexsup.c b/ld/lexsup.c
index 88e85c7..dacb962 100644
--- b/ld/lexsup.c
+++ a/ld/lexsup.c
@@ -543,12 +543,6 @@
{ {"orphan-handling", required_argument, NULL, OPTION_ORPHAN_HANDLING},
'\0', N_("=MODE"), N_("Control how orphan sections are handled."),
TWO_DASHES },
- { {"print-map-discarded", no_argument, NULL, OPTION_PRINT_MAP_DISCARDED},
- '\0', NULL, N_("Show discarded sections in map file output (default)"),
- TWO_DASHES },
- { {"no-print-map-discarded", no_argument, NULL, OPTION_NO_PRINT_MAP_DISCARDED},
- '\0', NULL, N_("Do not show discarded sections in map file output"),
- TWO_DASHES },
};
#define OPTION_COUNT ARRAY_SIZE (ld_options)
@@ -1583,14 +1577,6 @@
einfo (_("%F%P: invalid argument to option"
" \"--orphan-handling\"\n"));
break;
-
- case OPTION_NO_PRINT_MAP_DISCARDED:
- config.print_map_discarded = FALSE;
- break;
-
- case OPTION_PRINT_MAP_DISCARDED:
- config.print_map_discarded = TRUE;
- break;
}
}
diff --git a/ld/testsuite/ld-gc/gc.exp b/ld/testsuite/ld-gc/gc.exp
index 536356c..13968cc 100644
--- b/ld/testsuite/ld-gc/gc.exp
+++ a/ld/testsuite/ld-gc/gc.exp
@@ -171,5 +171,3 @@
]
run_dump_test "pr20306"
}
-
-run_dump_test "skip-map-discarded"
diff --git a/ld/testsuite/ld-gc/skip-map-discarded.d b/ld/testsuite/ld-gc/skip-map-discarded.d
new file mode 100644
index 0000000..2e79f0b
--- b/ld/testsuite/ld-gc/skip-map-discarded.d
+++ /dev/null
@@ -1,3 +0,0 @@
-#name: Check --no-print-map-discarded linker option
-#ld: -e 0 --gc-sections --no-print-map-discarded
-#map: skip-map-discarded.map
diff --git a/ld/testsuite/ld-gc/skip-map-discarded.map b/ld/testsuite/ld-gc/skip-map-discarded.map
new file mode 100644
index 0000000..ca4818e
--- b/ld/testsuite/ld-gc/skip-map-discarded.map
+++ /dev/null
@@ -1,5 +0,0 @@
-#failif
-Discarded input sections
-#...
- _foo.*
-#...
diff --git a/ld/testsuite/ld-gc/skip-map-discarded.s b/ld/testsuite/ld-gc/skip-map-discarded.s
new file mode 100644
index 0000000..630aab0
--- b/ld/testsuite/ld-gc/skip-map-discarded.s
+++ /dev/null
@@ -1,5 +0,0 @@
-.globl __start
-__start:
- .section _foo
-foo:
- .long 1
+-
2.9.5
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