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192 Commits

Author SHA1 Message Date
markj
401e64920a Add an lld option to emit PC-relative relocations for ifunc calls. 
The current kernel ifunc implementation creates a PLT entry for each
ifunc definition.  ifunc calls therefore consist of a call to the
PLT entry followed by an indirect jump.  The jump target is written
during boot when the kernel linker resolves R_[*]_IRELATIVE relocations.
This implementation is defined by requirements for userland code, where
text relocations are avoided.  This requirement is not present for the
kernel, so the implementation has avoidable overhead (namely, an extra
indirect jump per call).

Address this for now by adding a special option to the static linker
to inhibit PLT creation for ifuncs.  Instead, relocations to ifunc call
sites are passed through to the output file, so the kernel linker can
enumerate such call sites and apply PC-relative relocations directly
to the text section.  Thus the overhead of an ifunc call becomes exactly
the same as that of an ordinary function call.  This option is only for
use by the kernel and will not work for regular programs.

The final form of this optimization is up for debate; for now, this
change is simple and static enough to be acceptable as an interim
solution.

Reviewed by:	emaste
Discussed with:	arichardson, dim
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D16748
 2018-08-23 14:58:19 +00:00
bdrewery
b557130a94 Rework how the ld link is handled in WORLDTMP from r322811. 
LLD_BOOTSTRAP (build) is independent of LLD_IS_LD (installed) so they
should not be based on each other.

This is related to upcoming WITH_SYSTEM_LINKER work.

Reviewed by:	emaste
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D15836
 2018-06-20 16:10:02 +00:00
dim
4b91ca5ee1 Regenerate clang man page after upstream change to document the possible 
values for the -std= option.

Noticed by:	Steve Kargl
Obtained from:	https://reviews.llvm.org/rL329827
MFC after:	3 days
 2018-04-11 18:39:47 +00:00
emaste
b93a9fbc91 Promote llvm-cov to a standalone option 
Introduce WITH_/WITHOUT_LLVM_COV to match GCC's WITH_/WITHOUT_GCOV.
It is intended to provide a superset of the interface and functionality
of gcov.

It is enabled by default when building Clang, similarly to gcov and GCC.

This change moves one file in libllvm to be compiled unconditionally.
Previously it was included only when WITH_CLANG_EXTRAS was set, but the
complexity of a new special case for (CLANG_EXTRAS | LLVM_COV) is not
worth avoiding a tiny increase in build time.

Reviewed by:	dim, imp
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D142645
 2018-02-10 00:22:35 +00:00
emaste
346e102df0 ld.lld.1: explain long options may use one or two dashes 2018-02-08 00:09:17 +00:00
emaste
b3f3d10dc5 Update ld.lld.1 based on the version committed upstream 2018-02-07 23:58:00 +00:00
emaste
a2b20ce02f ld.lld.1: miscellaneous style improvements 
Submitted by:	wblock in review D13813
 2018-02-02 21:52:00 +00:00
dim
5473ed2089 Build llvm-extract with -lz, and add a few objects to liblldb, both of 
which turn out to be needed when you don't use -ffunction-sections.

Reported by:	Shawn Webb <shawn.webb@hardenedbsd.org>
 2018-01-13 13:53:05 +00:00
dim
b64d96a23d Merge ^/head r327624 through r327885. 2018-01-12 18:23:35 +00:00
emaste
124746b920 lld: introduce basic man page 
Upstream lld has no man page. Introduce a basic one for FreeBSD based on
ld.lld --help, with a brief introduction and additional detail for some
options.

We'll continue refining this in FreeBSD, and then submit it upstream once
the first round of edits are complete.

Submitted by:	krion, Arshan Khanifar, emaste, bjk
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D13813
 2018-01-10 16:01:25 +00:00
dim
d70df7c872 Regenerate clang manpage. 2017-12-24 13:06:37 +00:00
dim
6bab44f391 Regenerate llvm tools manpages, and add one for llvm-pbdutil. 2017-12-24 13:02:43 +00:00
dim
47fdbb772b Minimize library dependencies for some llvm tools. 2017-12-24 12:42:30 +00:00
dim
ef75509313 Add new llvm-objcopy utility, enabled when MK_CLANG_EXTRAS=yes. 2017-12-24 12:36:31 +00:00
dim
2bcccfe68a Update clang, lld and llvm version numbers for r321414, and update build 
glue.
 2017-12-24 12:32:55 +00:00
dim
d062dc1876 Next step in updating llvm/clang build glue: make lld build. 2017-12-22 16:27:29 +00:00
dim
196fc344f1 Next step in updating llvm/clang build glue: make the optional llvm and 
clang tools build.
 2017-12-22 13:28:10 +00:00
dim
ce14442b6c First step in updating llvm/clang build glue: make only the clang 
executable build.
 2017-12-21 21:24:52 +00:00
bdrewery
a598c4b809 DIRDEPS_BUILD: Update dependencies. 
Sponsored by:	Dell EMC Isilon
 2017-10-31 00:07:04 +00:00
jhb
054937d661 Improve the coverage of debug symbols for MK_DEBUG_FILES. 
- Include debug symbols in static libraries.  This permits binaries
  to include debug symbols for functions obtained from static libraries.
- Permit the C/C++ compiler flags added for MK_DEBUG_FILES to be
  overridden by setting DEBUG_FILES_CFLAGS.  Use this to limit the debug
  information for llvm libraries and binaries.

Reviewed by:	emaste
Sponsored by:	DARPA / AFRL
Differential Revision:	https://reviews.freebsd.org/D12025
 2017-08-23 23:30:25 +00:00
dim
4d0d296fa3 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r307894, and update 
build glue.
 2017-07-13 21:58:45 +00:00
dim
9a01022502 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r306956, and update 
build glue.
 2017-07-02 11:41:15 +00:00
dim
73efde936a Merge llvm, clang, lld, lldb, compiler-rt and libc++ r306325, and update 
build glue.
 2017-06-27 06:40:39 +00:00
dim
e30d1a0bf8 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r305575, and update 
build glue.
 2017-06-17 00:09:34 +00:00
dim
5bbcba2cd3 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r305145, and update 
build glue.
 2017-06-10 19:17:14 +00:00
dim
6f031eff4b Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304460, and update 
build glue.
 2017-06-01 22:47:02 +00:00
dim
50b9a0a9f0 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304149, and update 
build glue.
 2017-05-29 22:09:23 +00:00
dim
760ca322ee Merge llvm, clang, lld, lldb, compiler-rt and libc++ r303197, and update 
build glue.
 2017-05-16 21:50:29 +00:00
dim
a2f21cd2a8 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r302418, and update 
build glue.
 2017-05-08 19:20:55 +00:00
dim
61dad2ea11 Merge llvm, clang, lld, lldb, compiler-rt and libc++ r302069, and update 
build glue (preliminary, not all option combinations work yet).
 2017-05-03 21:54:55 +00:00
dim
62479c810b Merge llvm, clang, lld, lldb, compiler-rt and libc++ r301441, and update 
build glue.
 2017-04-26 22:33:09 +00:00
dim
2fcd40bfda Strip out a few objects from libclang, liblldb and lldb, which are not 
referenced due to the selection of tools that we build, and our compile
time options.
 2017-04-21 21:06:11 +00:00
dim
531ca112be Update some more build glue. All llvm extras, lld and lldb should link now. 2017-04-21 15:59:58 +00:00
dim
85a0472158 Add new objects to usr.bin/clang/lld for the MK_LLD=yes case. 2017-04-18 19:15:06 +00:00
dim
281710e0eb Add new objects to lib/clang/lib{llvm,clang} and usr.bin/clang for the 
MK_CLANG_EXTRAS=yes case.
 2017-04-18 17:39:20 +00:00
dim
00df9890ad Initial update of clang/llvm build glue, for building just a minimal 
clang executable.
 2017-04-17 11:21:42 +00:00
dim
b6265d45c3 Merge ^/head r312720 through r312893. 2017-01-27 20:01:46 +00:00
emaste
b55587be1b Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC 
Reported by:	Dan McGregor <dan.mcgregor usask.ca>
 2017-01-27 01:59:12 +00:00
dim
8b0a30be0e Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 
build glue.
 2017-01-14 22:12:13 +00:00
dim
664a908123 Merge ^/head r311546 through r311683. 2017-01-08 14:36:18 +00:00
dim
9a56cbcc17 Link llvm-ar to llvm-ranlib, if WITH_CLANG_EXTRAS is enabled. When 
invoked as llvm-ranlib, it can create an archive symbol table for
archives of objects compiled for LTO by an LLVM compiler.

Submitted by:	Dan McGregor <danismostlikely@gmail.com>
MFC after:	3 days
 2017-01-06 23:05:29 +00:00
dim
c9dc0ef1d3 Add new llvm-{cxxfilt,lto2,modextract,xray} tools. 2017-01-04 21:47:39 +00:00
dim
08c5a1d55e Fix double-dollar typo in lld Makefile. 2017-01-04 20:56:03 +00:00
dim
ebace18f46 Update lld Makefile. 2017-01-04 18:53:35 +00:00
dim
dd08d5700a Update llvm-cov and llvm-pdbdump Makefiles. 2017-01-04 18:53:25 +00:00
dim
972f2bc4ab Initial updates to llvm/clang build glue. 2017-01-03 20:28:09 +00:00
dim
60173ec21a Reapply 310775, now it also builds correctly if lldb is disabled: 
Move llvm-objdump from CLANG_EXTRAS to installed by default

We currently install three tools from binutils 2.17.50: as, ld, and
objdump. Work is underway to migrate to a permissively-licensed
tool-chain, with one goal being the retirement of binutils 2.17.50.

LLVM's llvm-objdump is intended to be compatible with GNU objdump
although it is currently missing some options and may have formatting
differences. Enable it by default for testing and further investigation.
It may later be changed to install as /usr/bin/objdump, it becomes a
fully viable replacement.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D8879
 2016-12-30 18:00:31 +00:00
dim
bbc9c01e68 Revert r310775 for now, until we can figure out why it does not seem to 
work properly when cross-building.  Sorry for the breakage.
 2016-12-29 21:57:16 +00:00
dim
760b3e4651 Move llvm-objdump from CLANG_EXTRAS to installed by default 
We currently install three tools from binutils 2.17.50: as, ld, and
objdump. Work is underway to migrate to a permissively-licensed
tool-chain, with one goal being the retirement of binutils 2.17.50.

LLVM's llvm-objdump is intended to be compatible with GNU objdump
although it is currently missing some options and may have formatting
differences. Enable it by default for testing and further investigation.
It may later be changed to install as /usr/bin/objdump, it becomes a
fully viable replacement.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D8879
 2016-12-29 13:27:04 +00:00
dim
0e604e79ff Fix packaging for clang, lldb and lld 3.9.0 
During the upgrade of clang/llvm etc to 3.9.0 in r309124, the PACKAGE
directive in the usr.bin/clang/*.mk files got dropped accidentally.

Restore it, with a few minor changes and additions:
* Correct license in clang.ucl to NCSA
* Add PACKAGE=clang for clang and most of the "ll" tools
* Put lldb in its own package
* Put lld in its own package

Reviewed by:	gjb, jmallett
X-MFC-With:	309124
Differential Revision: https://reviews.freebsd.org/D8666
 2016-11-28 20:13:56 +00:00