That supports skipping of an object file (LDPS_NO_SYMS).
lto-plugin/ChangeLog:
* lto-plugin.c (struct plugin_file_info): Add skip_file flag.
(write_resolution): Write resolution only if get_symbols != LDPS_NO_SYMS.
(all_symbols_read_handler): Ignore file if skip_file is true.
(onload): Handle LDPT_GET_SYMBOLS_V3.
As reported, libtool -export-symbols-regex doesn't work on Solaris
when using GNU ld instead of Sun ld, libtool just always assumes Sun ld.
As I'm unsure what is the maintainance status of libtool right now,
this patch solves it on the lto-plugin side instead, tests at configure time
similar way how libssp and other target libraries test for symbol versioning
(except omitting the symbol version because we just want one GLOBAL symbol
and rest of them LOCAL), and will use the current way of
-export-symbols-regex onload as fallback when this doesn't work.
2022-03-22 Jakub Jelinek <jakub@redhat.com>
PR lto/102426
lto-plugin/
* configure.ac (LTO_PLUGIN_USE_SYMVER, LTO_PLUGIN_USE_SYMVER_GNU,
LTO_PLUGIN_USE_SYMVER_SUN): New test for symbol versioning support.
* Makefile.am (version_arg, version_dep): Set conditionally based
on LTO_PLUGIN_USE_SYMVER*.
(liblto_plugin_la_LDFLAGS): Use $(version_arg) instead of
-export-symbols-regex onload.
(liblto_plugin_la_DEPENDENCIES): Depend on $(version_dep).
* lto-plugin.map: New file.
* configure: Regenerated.
* Makefile.in: Regenerated.
lto-plugin/ChangeLog:
* lto-plugin.c (all_symbols_read_handler): With -save-temps, use
link_output_name for -foffload-objects's file name, if available.
lto-plugin/ChangeLog:
* lto-plugin.c (process_offload_section): Use a linker as many
comments are connected to gold linker.
(process_option): Likewise.
The transposition nolto -> notlo is confusing and it makes the long
name even harder to read than it already is - I kept reading it as
"not lo" until I realized it was a simple typo.
Fixes: 5269b24605 (Silence warning in LTO mode on VxWorks)
lto-plugin/
* lto-plugin.c: Fix -linker-output-auto-notlo-rel ->
-linker-output-auto-nolto-rel typo.
(process_option): Adjust accordingly, accepting both old and
new spelling.
gcc/
* config/vxworks.h (LTO_PLUGIN_SPEC): Adapt to corrected
spelling of -linker-output-auto-nolto-rel.
So right now liblto_plugin.so exports many libiberty symbols and
simple_object file symbols but really it just needs to export onload.
This fixes the problem by using "-export-symbols-regex onload" on
the libtool link line.
lto-plugin/ChangeLog:
PR lto/49664
* Makefile.am: Export only onload.
* Makefile.in: Regenerate.
This adds a -ltrans-objects option to lto-plugin that by-passes
lto-wrapper invocation and instead feeds LD the final LTRANS objects
directly from the response file given as argument to the option.
This allows LD issues involving the linker-plugin path to be
debugged in an easier way with just the IR objects (their symtab)
and the LTRANS objects as testcase.
I've tested the path re-building stage2 build/genmatch from an
LTO bootstrap and got a bit-identical executable by adding
-plugin-opt=-ltrans-objects=y to the original collect2 invocation,
seeding y with the final objects as printed by building genmatch
with -save-temps -v.
2021-06-22 Richard Biener <rguenther@suse.de>
lto-plugin/
* lto-plugin.c (ltrans_objects): New global.
(all_symbols_read_handler): If -ltrans-objects was specified,
add the output files from the specified file directly.
(process_option): Handle -ltrans-objects.
This fixes:
lto-plugin.c:642:7: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int]
lto-plugin/ChangeLog:
* lto-plugin.c (exec_lto_wrapper): Make a temp variable.
This is an analogous option to --bootstrap-asan to configure. It allows
bootstrapping GCC using HWASAN.
For the same reasons as for ASAN we have to avoid using the HWASAN
sanitizer when compiling libiberty and the lto-plugin.
Also add a function to query whether -fsanitize=hwaddress has been
passed.
ChangeLog:
* configure: Regenerate.
* configure.ac: Add --bootstrap-hwasan option.
config/ChangeLog:
* bootstrap-hwasan.mk: New file.
gcc/ChangeLog:
* doc/install.texi: Document new option.
libiberty/ChangeLog:
* configure: Regenerate.
* configure.ac: Avoid using sanitizer.
lto-plugin/ChangeLog:
* Makefile.am: Avoid using sanitizer.
* Makefile.in: Regenerate.
GCC on Linux already uses liblto_plugin.so directly without
the libtool version suffix, adjust windows GCC to do the same.
gcc/ChangeLog:
* config.host: Adjust plugin name for Windows.
lto-plugin/ChangeLog:
* Makefile.am: drop versioning from libtool completely.
* Makefile.in: regenerate.
2020-09-09 Nick Clifton <nickc@redhat.com>
* lto-plugin.c (struct plugin_symtab): Add last_sym field.
(parse_symtab_extension): Only read as many entries as are
available in the buffer. Store the data read into the symbol
table indexed from last_sym. Increment last_sym.
With --enable-cet, require CET support only for the final GCC build.
Don't enable CET without CET support for non-bootstrap build, in stage1
nor for build support.
config/
PR bootstrap/96202
* cet.m4 (GCC_CET_HOST_FLAGS): Don't enable CET without CET
support in stage1 nor for build support.
gcc/
PR bootstrap/96202
* configure: Regenerated.
libbacktrace/
PR bootstrap/96202
* configure: Regenerated.
libcc1/
PR bootstrap/96202
* configure: Regenerated.
libcpp/
PR bootstrap/96202
* configure: Regenerated.
libdecnumber/
PR bootstrap/96202
* configure: Regenerated.
libiberty/
PR bootstrap/96202
* configure: Regenerated.
lto-plugin/
PR bootstrap/96202
* configure: Regenerated.
This patch simplifies (!!!) the logic governing the naming of dump
files and auxiliary output files in the driver, in the compiler, and
in the LTO wrapper. No changes are made to the naming of primary
outputs, there are often ways to restore past behavior, and a number
of inconsistencies are fixed. Some internal options are removed
(-auxbase and -auxbase-strip), sensible existing uses of -dumpdir and
-dumpbase options remain unchanged, additional useful cases are added,
making for what is still admittedly quite complex. Extensive
documentation and testcases provide numerous examples, from normal to
corner cases.
The most visible changes are:
- aux and dump files now always go in the same directory, that
defaults to the directory of the primary output, but that can be
overridden with -dumpdir, -save-temps=*, or, preserving past behavior,
with a -dumpbase with a directory component.
- driver and compiler now have the same notion of naming of auxiliary
outputs, e.g. .dwo files will no longer be in one location while the
debug info suggests they are elsewhere, and -save-temps and .dwo
auxiliary outputs now go in the same location as .su, .ci and
coverage data, with consistent naming.
- explicitly-specified primary output names guide not only the
location of aux and dump outputs: the output base name is also used in
their base name, as a prefix when also linking (e.g. foo.c bar.c -o
foobar creates foobar-foo.dwo and foobar-bar.dwo with -gsplit-dwarf),
or as the base name instead of the input name (foo.c -c -o whatever.o
creates whatever.su rather than foo.su with -fstack-usage). The
preference for the input file base name, quite useful for our
testsuite, can be restored with -dumpbase "". When compiling and
linking tests in the testsuite with additional inputs, we now use this
flag. Files named in dejagnu board ldflags, libs, and ldscripts are
now quoted in the gcc testsuite with -Wl, so that they are not counted
as additional inputs by the compiler driver.
- naming a -dumpbase when compiling multiple sources used to cause
dumps from later compiles to overwrite those of earlier ones; it is
now used as a prefix when compiling multiple sources, like an
executable name above.
- the dumpbase, explicitly specified or computed from output or input
names, now also governs the naming of aux outputs; since aux outputs
usually replaced the suffix from the input name, while dump outputs
append their own additional suffixes, a -dumpbase-ext option is
introduced to enable a chosen suffix to be dropped from dumpbase to
form aux output names.
- LTO dump and aux outputs were quite a mess, sometimes leaking
temporary output names into -save-temps output names, sometimes
conversely generating desirable aux outputs in temporary locations.
They now obey the same logic of compiler aux and dump outputs, landing
in the expected location and taking the linker output name or an
explicit dumpbase overrider into account.
- Naming of -fdump-final-insns outputs now follows the dump file
naming logic for the .gkd files, and the .gk dump files generated in
the second -fcompare-debug compilation get the .gk inserted before the
suffix that -dumpbase-ext drops in aux outputs.
gcc/ChangeLog:
* common.opt (aux_base_name): Define.
(dumpbase, dumpdir): Mark as Driver options.
(-dumpbase, -dumpdir): Likewise.
(dumpbase-ext, -dumpbase-ext): New.
(auxbase, auxbase-strip): Drop.
* doc/invoke.texi (-dumpbase, -dumpbase-ext, -dumpdir):
Document.
(-o): Introduce the notion of primary output, mention it
influences auxiliary and dump output names as well, add
examples.
(-save-temps): Adjust, move examples into -dump*.
(-save-temps=cwd, -save-temps=obj): Likewise.
(-fdump-final-insns): Adjust.
* dwarf2out.c (gen_producer_string): Drop auxbase and
auxbase_strip; add dumpbase_ext.
* gcc.c (enum save_temps): Add SAVE_TEMPS_DUMP.
(save_temps_prefix, save_temps_length): Drop.
(save_temps_overrides_dumpdir): New.
(dumpdir, dumpbase, dumpbase_ext): New.
(dumpdir_length, dumpdir_trailing_dash_added): New.
(outbase, outbase_length): New.
(The Specs Language): Introduce %". Adjust %b and %B.
(ASM_FINAL_SPEC): Use %b.dwo for an aux output name always.
Precede object file with %w when it's the primary output.
(cpp_debug_options): Do not pass on incoming -dumpdir,
-dumpbase and -dumpbase-ext options; recompute them with
%:dumps.
(cc1_options): Drop auxbase with and without compare-debug;
use cpp_debug_options instead of dumpbase. Mark asm output
with %w when it's the primary output.
(static_spec_functions): Drop %:compare-debug-auxbase-opt and
%:replace-exception. Add %:dumps.
(driver_handle_option): Implement -save-temps=*/-dumpdir
mutual overriding logic. Save dumpdir, dumpbase and
dumpbase-ext options. Do not save output_file in
save_temps_prefix.
(adds_single_suffix_p): New.
(single_input_file_index): New.
(process_command): Combine output dir, output base name, and
dumpbase into dumpdir and outbase.
(set_collect_gcc_options): Pass a possibly-adjusted -dumpdir.
(do_spec_1): Optionally dumpdir instead of save_temps_prefix,
and outbase instead of input_basename in %b, %B and in
-save-temps aux files. Handle empty argument %".
(driver::maybe_run_linker): Adjust dumpdir and auxbase.
(compare_debug_dump_opt_spec_function): Adjust gkd dump file
naming. Spec-quote the computed -fdump-final-insns file name.
(debug_auxbase_opt): Drop.
(compare_debug_self_opt_spec_function): Drop auxbase-strip
computation.
(compare_debug_auxbase_opt_spec_function): Drop.
(not_actual_file_p): New.
(replace_extension_spec_func): Drop.
(dumps_spec_func): New.
(convert_white_space): Split-out parts into...
(quote_string, whitespace_to_convert_p): ... these. New.
(quote_spec_char_p, quote_spec, quote_spec_arg): New.
(driver::finalize): Release and reset new variables; drop
removed ones.
* lto-wrapper.c (HAVE_TARGET_EXECUTABLE_SUFFIX): Define if...
(TARGET_EXECUTABLE_SUFFIX): ... is defined; define this to the
empty string otherwise.
(DUMPBASE_SUFFIX): Drop leading period.
(debug_objcopy): Use concat.
(run_gcc): Recognize -save-temps=* as -save-temps too. Obey
-dumpdir. Pass on empty dumpdir and dumpbase with a directory
component. Simplify temp file names.
* opts.c (finish_options): Drop aux base name handling.
(common_handle_option): Drop auxbase-strip handling.
* toplev.c (print_switch_values): Drop auxbase, add
dumpbase-ext.
(process_options): Derive aux_base_name from dump_base_name
and dump_base_ext.
(lang_dependent_init): Compute dump_base_ext along with
dump_base_name. Disable stack usage and callgraph-info during
lto generation and compare-debug recompilation.
gcc/fortran/ChangeLog:
* options.c (gfc_get_option_string): Drop auxbase, add
dumpbase_ext.
gcc/ada/ChangeLog:
* gcc-interface/lang-specs.h: Drop auxbase and auxbase-strip.
Use %:dumps instead of -dumpbase. Add %w for implicit .s
primary output.
* switch.adb (Is_Internal_GCC_Switch): Recognize dumpdir and
dumpbase-ext. Drop auxbase and auxbase-strip.
lto-plugin/ChangeLog:
* lto-plugin.c (skip_in_suffix): New.
(exec_lto_wrapper): Use skip_in_suffix and concat to build
non-temporary output names.
(onload): Look for -dumpdir in COLLECT_GCC_OPTIONS, and
override link_output_name with it.
contrib/ChangeLog:
* compare-debug: Adjust for .gkd files named as dump files,
with the source suffix rather than the object suffix.
gcc/testsuite/ChangeLog:
* gcc.misc-tests/outputs.exp: New.
* gcc.misc-tests/outputs-0.c: New.
* gcc.misc-tests/outputs-1.c: New.
* gcc.misc-tests/outputs-2.c: New.
* lib/gcc-defs.exp (gcc_adjusted_linker_flags): New.
(gcc_adjust_linker_flags): New.
(dg-additional-files-options): Call it. Pass -dumpbase ""
when there are additional sources.
* lib/profopt.exp (profopt-execute): Pass the executable
suffix with -dumpbase-ext.
* lib/scandump.exp (dump-base): Mention -dumpbase "" use.
* lib/scanltranstree.exp: Adjust dump suffix expectation.
* lib/scanwpaipa.exp: Likewise.
Don't perform CET run-time check for host when cross compiling. Instead,
enable CET in cross compiler if possible so that it will run on both CET
and non-CET hosts.
config/
PR bootstrap/94998
* cet.m4 (GCC_CET_HOST_FLAGS): Enable CET in cross compiler if
possible.
libiberty/
PR bootstrap/94998
* configure: Regenerated.
lto-plugin/
PR bootstrap/94998
* configure: Regenerated.
The link phase is always partial (-r) for VxWorks in kernel mode, which
means that it uses incremental LTO linking by default (-flinker-output=rel).
But in this mode the LTO plugin outputs a warning if one of the object files
involved in the link does not contain LTO bytecode, before switching to
nolto-rel mode. We do not do repeated incremental linking for VxWorks so
silence the warning.
lto-plugin/
* lto-plugin.c: Document -linker-output-auto-notlo-rel option.
(linker_output_set): Change type to bool.
(linker_output_known): Likewise.
(linker_output_auto_nolto_rel): New variable.
(all_symbols_read_handler): Take it into account.
<LDPO_REL>: Do not issue the warning if it is set.
(process_option): Process -linker-output-auto-notlo-rel.
(cleanup_handler): Remove unused variable.
(onload) <LDPT_LINKER_OUTPUT>: Adjust to above type change.
gcc/
* gcc.c (LTO_PLUGIN_SPEC): Define if not already.
(LINK_PLUGIN_SPEC): Execute LTO_PLUGIN_SPEC.
* config/vxworks.h (LTO_PLUGIN_SPEC): Define.
GCC_CET_HOST_FLAGS uses -Wl,-z,ibt,-z,shstk to check if Linux/x86 host
has Intel CET enabled by introducing an Intel CET violation on purpose.
To avoid false positive, check whether -Wl,-z,ibt,-z,shstk works first.
-fcf-protection=none is added to avoid false negative when -fcf-protection
is enabled by default.
config/
PR bootstrap/94739
* cet.m4 (GCC_CET_HOST_FLAGS): Add -fcf-protection=none to
-Wl,-z,ibt,-z,shstk. Check whether -fcf-protection=none
-Wl,-z,ibt,-z,shstk works first.
libiberty/
PR bootstrap/94739
* configure: Regenerated.
lto-plugin/
PR bootstrap/94739
* configure: Regenerated.
Since ld is Intel CET enabled on Intel CET enabled host, dlopen fails on
liblto_plugin.so if it isn't Intel CET enabled. Add GCC_CET_HOST_FLAGS
to cet.m4, use it in libiberty and lto-plugin to always enable Intel
CET in liblto_plugin.so on Intel CET enabled host.
On Linux/x86 host, enable Intel CET by default if assembler and compiler
support Intel CET so that the generated liblto_plugin.so can be used on
both CET and non-CET machines. It is an error to disable Intel CET in
liblto_plugin.so on Intel CET enabled host.
config/
PR bootstrap/94739
* cet.m4 (GCC_CET_HOST_FLAGS): New.
libiberty/
PR bootstrap/94739
* Makefile.in (COMPILE.c): Add @CET_HOST_FLAGS@.
(configure_deps): Add $(srcdir)/../config/cet.m4 and
$(srcdir)/../config/enable.m4.
* aclocal.m4: Include ../config/cet.m4 and ../config/enable.m4.
* configure.ac: Add GCC_CET_HOST_FLAGS(CET_HOST_FLAGS) and
AC_SUBST(CET_HOST_FLAGS).
* configure: Regenerated.
lto-plugin/
PR bootstrap/94739
* Makefile.am (AM_CFLAGS): Add $(CET_HOST_FLAGS).
* configure.ac: Add GCC_CET_HOST_FLAGS(CET_HOST_FLAGS) and
AC_SUBST(CET_HOST_FLAGS).
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
This patch makes the lto-plugin follow the same approach
to save-temps as collect2.
-save-temps causes the temp file to be named meaningfully,
and for the relevant input files to be saved in CWD.
-v, —version causes the save actions to be output to stderr.
one can get this to happen by just putting -save-temps, -v on
the regular link line or (for compatibility with the way the
-debug flag works) by appending -plugin-opt=-save-temps, etc.
lto-plugin/
2019-05-15 Iain Sandoe <iain@sandoe.co.uk>
* lto-plugin.c (exec_lto_wrapper): Make the wrapper
arguments filename more user-friendly.
(file_exists, maybe_unlink): New.
(cleanup_handler): Use maybe unlink to handle the
case when temps should be saved.
(process_option): Look for -v, —-version, -save-temps.
(onload): Record the linker output file name.
Check for -v, —-version, -save-temps in the GCC collect
options environment.
From-SVN: r271202
