LLVM currently ships with a new ELF linker http://lld.llvm.org/.
I experiment a lot with gcc and lld so it would be nice if
-fuse-ld=lld is supported (considering the linker is now mature enough
to link large C/C++ applications).
Also, IMHO, -fuse-ld should be a generic facility which accept other
linkers (as long as they follow the convention ld.<arg>), and should
also support absolute path, e.g. -fuse-ld=/usr/local/bin/ld.mylinker.
Probably outside of the scope of this patch, but I thought worth
mentioning.
Thanks,
--
Davide
>From 323c23d79c91d7dcee2f29b9ced8c1c00703d346 Mon Sep 17 00:00:00 2001
From: Davide Italiano <dccitali...@gmail.com>
Date: Thu, 23 Jun 2016 20:51:53 -0700
Subject: [PATCH] Driver: Add support for -fuse-ld=lld.
* collect2.c (main): Support -fuse-ld=lld.
* common.opt: Add fuse-ld=lld
* doc/invoke.texi: Document -fuse-ld=lld
* opts.c: Ignore -fuse-ld=lld
---
gcc/collect2.c | 11 ++++++++---
gcc/common.opt | 4 ++++
gcc/doc/invoke.texi | 4 ++++
gcc/opts.c | 1 +
4 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/gcc/collect2.c b/gcc/collect2.c
index bffac80..6a8387c 100644
--- a/gcc/collect2.c
+++ b/gcc/collect2.c
@@ -831,6 +831,7 @@ main (int argc, char **argv)
USE_PLUGIN_LD,
USE_GOLD_LD,
USE_BFD_LD,
+ USE_LLD_LD,
USE_LD_MAX
} selected_linker = USE_DEFAULT_LD;
static const char *const ld_suffixes[USE_LD_MAX] =
@@ -838,7 +839,8 @@ main (int argc, char **argv)
"ld",
PLUGIN_LD_SUFFIX,
"ld.gold",
- "ld.bfd"
+ "ld.bfd",
+ "ld.lld"
};
static const char *const real_ld_suffix = "real-ld";
static const char *const collect_ld_suffix = "collect-ld";
@@ -1004,6 +1006,8 @@ main (int argc, char **argv)
selected_linker = USE_BFD_LD;
else if (strcmp (argv[i], "-fuse-ld=gold") == 0)
selected_linker = USE_GOLD_LD;
+ else if (strcmp (argv[i], "-fuse-ld=lld") == 0)
+ selected_linker = USE_LLD_LD;
#ifdef COLLECT_EXPORT_LIST
/* These flags are position independent, although their order
@@ -1093,7 +1097,8 @@ main (int argc, char **argv)
/* Maybe we know the right file to use (if not cross). */
ld_file_name = 0;
#ifdef DEFAULT_LINKER
- if (selected_linker == USE_BFD_LD || selected_linker == USE_GOLD_LD)
+ if (selected_linker == USE_BFD_LD || selected_linker == USE_GOLD_LD ||
+ selected_linker == USE_LLD_LD)
{
char *linker_name;
# ifdef HOST_EXECUTABLE_SUFFIX
@@ -1307,7 +1312,7 @@ main (int argc, char **argv)
else if (!use_collect_ld
&& strncmp (arg, "-fuse-ld=", 9) == 0)
{
- /* Do not pass -fuse-ld={bfd|gold} to the linker. */
+ /* Do not pass -fuse-ld={bfd|gold|lld} to the linker. */
ld1--;
ld2--;
}
diff --git a/gcc/common.opt b/gcc/common.opt
index 5d90385..2a95a1f 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2536,6 +2536,10 @@ fuse-ld=gold
Common Driver Negative(fuse-ld=bfd)
Use the gold linker instead of the default linker.
+fuse-ld=lld
+Common Driver Negative(fuse-ld=lld)
+Use the lld LLVM linker instead of the default linker.
+
fuse-linker-plugin
Common Undocumented Var(flag_use_linker_plugin)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 2c87c53..4b8acff 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -10651,6 +10651,10 @@ Use the @command{bfd} linker instead of the
default linker.
@opindex fuse-ld=gold
Use the @command{gold} linker instead of the default linker.
+@item -fuse-ld=lld
+@opindex fuse-ld=lld
+Use the LLVM @command{lld} linker instead of the default linker.
+
@cindex Libraries
@item -l@var{library}
@itemx -l @var{library}
diff --git a/gcc/opts.c b/gcc/opts.c
index 7406210..f2c86f7 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -2178,6 +2178,7 @@ common_handle_option (struct gcc_options *opts,
case OPT_fuse_ld_bfd:
case OPT_fuse_ld_gold:
+ case OPT_fuse_ld_lld:
case OPT_fuse_linker_plugin:
/* No-op. Used by the driver and passed to us because it starts with f.*/
break;
--
2.5.5
From 323c23d79c91d7dcee2f29b9ced8c1c00703d346 Mon Sep 17 00:00:00 2001
From: Davide Italiano <dccitali...@gmail.com>
Date: Thu, 23 Jun 2016 20:51:53 -0700
Subject: [PATCH] Driver: Add support for -fuse-ld=lld.
* collect2.c (main): Support -fuse-ld=lld.
* common.opt: Add fuse-ld=lld
* doc/invoke.texi: Document -fuse-ld=lld
* opts.c: Ignore -fuse-ld=lld
---
gcc/collect2.c | 11 ++++++++---
gcc/common.opt | 4 ++++
gcc/doc/invoke.texi | 4 ++++
gcc/opts.c | 1 +
4 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/gcc/collect2.c b/gcc/collect2.c
index bffac80..6a8387c 100644
--- a/gcc/collect2.c
+++ b/gcc/collect2.c
@@ -831,6 +831,7 @@ main (int argc, char **argv)
USE_PLUGIN_LD,
USE_GOLD_LD,
USE_BFD_LD,
+ USE_LLD_LD,
USE_LD_MAX
} selected_linker = USE_DEFAULT_LD;
static const char *const ld_suffixes[USE_LD_MAX] =
@@ -838,7 +839,8 @@ main (int argc, char **argv)
"ld",
PLUGIN_LD_SUFFIX,
"ld.gold",
- "ld.bfd"
+ "ld.bfd",
+ "ld.lld"
};
static const char *const real_ld_suffix = "real-ld";
static const char *const collect_ld_suffix = "collect-ld";
@@ -1004,6 +1006,8 @@ main (int argc, char **argv)
selected_linker = USE_BFD_LD;
else if (strcmp (argv[i], "-fuse-ld=gold") == 0)
selected_linker = USE_GOLD_LD;
+ else if (strcmp (argv[i], "-fuse-ld=lld") == 0)
+ selected_linker = USE_LLD_LD;
#ifdef COLLECT_EXPORT_LIST
/* These flags are position independent, although their order
@@ -1093,7 +1097,8 @@ main (int argc, char **argv)
/* Maybe we know the right file to use (if not cross). */
ld_file_name = 0;
#ifdef DEFAULT_LINKER
- if (selected_linker == USE_BFD_LD || selected_linker == USE_GOLD_LD)
+ if (selected_linker == USE_BFD_LD || selected_linker == USE_GOLD_LD ||
+ selected_linker == USE_LLD_LD)
{
char *linker_name;
# ifdef HOST_EXECUTABLE_SUFFIX
@@ -1307,7 +1312,7 @@ main (int argc, char **argv)
else if (!use_collect_ld
&& strncmp (arg, "-fuse-ld=", 9) == 0)
{
- /* Do not pass -fuse-ld={bfd|gold} to the linker. */
+ /* Do not pass -fuse-ld={bfd|gold|lld} to the linker. */
ld1--;
ld2--;
}
diff --git a/gcc/common.opt b/gcc/common.opt
index 5d90385..2a95a1f 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2536,6 +2536,10 @@ fuse-ld=gold
Common Driver Negative(fuse-ld=bfd)
Use the gold linker instead of the default linker.
+fuse-ld=lld
+Common Driver Negative(fuse-ld=lld)
+Use the lld LLVM linker instead of the default linker.
+
fuse-linker-plugin
Common Undocumented Var(flag_use_linker_plugin)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 2c87c53..4b8acff 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -10651,6 +10651,10 @@ Use the @command{bfd} linker instead of the default linker.
@opindex fuse-ld=gold
Use the @command{gold} linker instead of the default linker.
+@item -fuse-ld=lld
+@opindex fuse-ld=lld
+Use the LLVM @command{lld} linker instead of the default linker.
+
@cindex Libraries
@item -l@var{library}
@itemx -l @var{library}
diff --git a/gcc/opts.c b/gcc/opts.c
index 7406210..f2c86f7 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -2178,6 +2178,7 @@ common_handle_option (struct gcc_options *opts,
case OPT_fuse_ld_bfd:
case OPT_fuse_ld_gold:
+ case OPT_fuse_ld_lld:
case OPT_fuse_linker_plugin:
/* No-op. Used by the driver and passed to us because it starts with f.*/
break;
--
2.5.5
