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lto-wrapper.c
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lto-wrapper.c
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/* Wrapper to call lto. Used by collect2 and the linker plugin.
Copyright (C) 2009-2020 Free Software Foundation, Inc.
Factored out of collect2 by Rafael Espindola <espindola@google.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* This program is passed a gcc, a list of gcc arguments and a list of
object files containing IL. It scans the argument list to check if
we are in whopr mode or not modifies the arguments and needed and
prints a list of output files on stdout.
Example:
$ lto-wrapper gcc/xgcc -B gcc a.o b.o -o test -flto
The above will print something like
/tmp/ccwbQ8B2.lto.o
If WHOPR is used instead, more than one file might be produced
./ccXj2DTk.lto.ltrans.o
./ccCJuXGv.lto.ltrans.o
*/
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "intl.h"
#include "diagnostic.h"
#include "obstack.h"
#include "opts.h"
#include "options.h"
#include "simple-object.h"
#include "lto-section-names.h"
#include "collect-utils.h"
/* Environment variable, used for passing the names of offload targets from GCC
driver to lto-wrapper. */
#define OFFLOAD_TARGET_NAMES_ENV "OFFLOAD_TARGET_NAMES"
enum lto_mode_d {
LTO_MODE_NONE, /* Not doing LTO. */
LTO_MODE_LTO, /* Normal LTO. */
LTO_MODE_WHOPR /* WHOPR. */
};
/* Current LTO mode. */
static enum lto_mode_d lto_mode = LTO_MODE_NONE;
static char *ltrans_output_file;
static char *flto_out;
static unsigned int nr;
static int *ltrans_priorities;
static char **input_names;
static char **output_names;
static char **offload_names;
static char *offload_objects_file_name;
static char *makefile;
static unsigned int num_deb_objs;
static const char **early_debug_object_names;
static bool xassembler_options_error = false;
const char tool_name[] = "lto-wrapper";
/* Delete tempfiles. Called from utils_cleanup. */
void
tool_cleanup (bool)
{
unsigned int i;
if (ltrans_output_file)
maybe_unlink (ltrans_output_file);
if (flto_out)
maybe_unlink (flto_out);
if (offload_objects_file_name)
maybe_unlink (offload_objects_file_name);
if (makefile)
maybe_unlink (makefile);
if (early_debug_object_names)
for (i = 0; i < num_deb_objs; ++i)
if (early_debug_object_names[i])
maybe_unlink (early_debug_object_names[i]);
for (i = 0; i < nr; ++i)
{
maybe_unlink (input_names[i]);
if (output_names[i])
maybe_unlink (output_names[i]);
}
}
static void
lto_wrapper_cleanup (void)
{
utils_cleanup (false);
}
/* Unlink a temporary LTRANS file unless requested otherwise. */
void
maybe_unlink (const char *file)
{
if (!save_temps)
{
if (unlink_if_ordinary (file)
&& errno != ENOENT)
fatal_error (input_location, "deleting LTRANS file %s: %m", file);
}
else if (verbose)
fprintf (stderr, "[Leaving LTRANS %s]\n", file);
}
/* Template of LTRANS dumpbase suffix. */
#define DUMPBASE_SUFFIX ".ltrans18446744073709551615"
/* Create decoded options from the COLLECT_GCC and COLLECT_GCC_OPTIONS
environment. */
static void
get_options_from_collect_gcc_options (const char *collect_gcc,
const char *collect_gcc_options,
struct cl_decoded_option **decoded_options,
unsigned int *decoded_options_count)
{
struct obstack argv_obstack;
const char **argv;
int argc;
obstack_init (&argv_obstack);
obstack_ptr_grow (&argv_obstack, collect_gcc);
parse_options_from_collect_gcc_options (collect_gcc_options,
&argv_obstack, &argc);
argv = XOBFINISH (&argv_obstack, const char **);
decode_cmdline_options_to_array (argc, (const char **)argv, CL_DRIVER,
decoded_options, decoded_options_count);
obstack_free (&argv_obstack, NULL);
}
/* Append OPTION to the options array DECODED_OPTIONS with size
DECODED_OPTIONS_COUNT. */
static void
append_option (struct cl_decoded_option **decoded_options,
unsigned int *decoded_options_count,
struct cl_decoded_option *option)
{
++*decoded_options_count;
*decoded_options
= (struct cl_decoded_option *)
xrealloc (*decoded_options,
(*decoded_options_count
* sizeof (struct cl_decoded_option)));
memcpy (&(*decoded_options)[*decoded_options_count - 1], option,
sizeof (struct cl_decoded_option));
}
/* Remove option number INDEX from DECODED_OPTIONS, update
DECODED_OPTIONS_COUNT. */
static void
remove_option (struct cl_decoded_option **decoded_options,
int index, unsigned int *decoded_options_count)
{
--*decoded_options_count;
memmove (&(*decoded_options)[index + 1],
&(*decoded_options)[index],
sizeof (struct cl_decoded_option)
* (*decoded_options_count - index));
}
/* Try to merge and complain about options FDECODED_OPTIONS when applied
ontop of DECODED_OPTIONS. */
static void
merge_and_complain (struct cl_decoded_option **decoded_options,
unsigned int *decoded_options_count,
struct cl_decoded_option *fdecoded_options,
unsigned int fdecoded_options_count)
{
unsigned int i, j;
struct cl_decoded_option *pic_option = NULL;
struct cl_decoded_option *pie_option = NULL;
/* ??? Merge options from files. Most cases can be
handled by either unioning or intersecting
(for example -fwrapv is a case for unioning,
-ffast-math is for intersection). Most complaints
about real conflicts between different options can
be deferred to the compiler proper. Options that
we can neither safely handle by intersection nor
unioning would need to be complained about here.
Ideally we'd have a flag in the opt files that
tells whether to union or intersect or reject.
In absence of that it's unclear what a good default is.
It's also difficult to get positional handling correct. */
/* The following does what the old LTO option code did,
union all target and a selected set of common options. */
for (i = 0; i < fdecoded_options_count; ++i)
{
struct cl_decoded_option *foption = &fdecoded_options[i];
switch (foption->opt_index)
{
case OPT_SPECIAL_unknown:
case OPT_SPECIAL_ignore:
case OPT_SPECIAL_warn_removed:
case OPT_SPECIAL_program_name:
case OPT_SPECIAL_input_file:
break;
default:
if (!(cl_options[foption->opt_index].flags & CL_TARGET))
break;
/* Fallthru. */
case OPT_fdiagnostics_show_caret:
case OPT_fdiagnostics_show_labels:
case OPT_fdiagnostics_show_line_numbers:
case OPT_fdiagnostics_show_option:
case OPT_fdiagnostics_show_location_:
case OPT_fshow_column:
case OPT_fcommon:
case OPT_fgnu_tm:
case OPT_g:
/* Do what the old LTO code did - collect exactly one option
setting per OPT code, we pick the first we encounter.
??? This doesn't make too much sense, but when it doesn't
then we should complain. */
for (j = 0; j < *decoded_options_count; ++j)
if ((*decoded_options)[j].opt_index == foption->opt_index)
break;
if (j == *decoded_options_count)
append_option (decoded_options, decoded_options_count, foption);
break;
/* Figure out what PIC/PIE level wins and merge the results. */
case OPT_fPIC:
case OPT_fpic:
pic_option = foption;
break;
case OPT_fPIE:
case OPT_fpie:
pie_option = foption;
break;
case OPT_fopenmp:
case OPT_fopenacc:
/* For selected options we can merge conservatively. */
for (j = 0; j < *decoded_options_count; ++j)
if ((*decoded_options)[j].opt_index == foption->opt_index)
break;
if (j == *decoded_options_count)
append_option (decoded_options, decoded_options_count, foption);
/* -fopenmp > -fno-openmp,
-fopenacc > -fno-openacc */
else if (foption->value > (*decoded_options)[j].value)
(*decoded_options)[j] = *foption;
break;
case OPT_fopenacc_dim_:
/* Append or check identical. */
for (j = 0; j < *decoded_options_count; ++j)
if ((*decoded_options)[j].opt_index == foption->opt_index)
break;
if (j == *decoded_options_count)
append_option (decoded_options, decoded_options_count, foption);
else if (strcmp ((*decoded_options)[j].arg, foption->arg))
fatal_error (input_location,
"option %s with different values",
foption->orig_option_with_args_text);
break;
case OPT_O:
case OPT_Ofast:
case OPT_Og:
case OPT_Os:
for (j = 0; j < *decoded_options_count; ++j)
if ((*decoded_options)[j].opt_index == OPT_O
|| (*decoded_options)[j].opt_index == OPT_Ofast
|| (*decoded_options)[j].opt_index == OPT_Og
|| (*decoded_options)[j].opt_index == OPT_Os)
break;
if (j == *decoded_options_count)
append_option (decoded_options, decoded_options_count, foption);
else if ((*decoded_options)[j].opt_index == foption->opt_index
&& foption->opt_index != OPT_O)
/* Exact same options get merged. */
;
else
{
/* For mismatched option kinds preserve the optimization
level only, thus merge it as -On. This also handles
merging of same optimization level -On. */
int level = 0;
switch (foption->opt_index)
{
case OPT_O:
if (foption->arg[0] == '\0')
level = MAX (level, 1);
else
level = MAX (level, atoi (foption->arg));
break;
case OPT_Ofast:
level = MAX (level, 3);
break;
case OPT_Og:
level = MAX (level, 1);
break;
case OPT_Os:
level = MAX (level, 2);
break;
default:
gcc_unreachable ();
}
switch ((*decoded_options)[j].opt_index)
{
case OPT_O:
if ((*decoded_options)[j].arg[0] == '\0')
level = MAX (level, 1);
else
level = MAX (level, atoi ((*decoded_options)[j].arg));
break;
case OPT_Ofast:
level = MAX (level, 3);
break;
case OPT_Og:
level = MAX (level, 1);
break;
case OPT_Os:
level = MAX (level, 2);
break;
default:
gcc_unreachable ();
}
(*decoded_options)[j].opt_index = OPT_O;
char *tem;
tem = xasprintf ("-O%d", level);
(*decoded_options)[j].arg = &tem[2];
(*decoded_options)[j].canonical_option[0] = tem;
(*decoded_options)[j].value = 1;
}
break;
case OPT_foffload_abi_:
for (j = 0; j < *decoded_options_count; ++j)
if ((*decoded_options)[j].opt_index == foption->opt_index)
break;
if (j == *decoded_options_count)
append_option (decoded_options, decoded_options_count, foption);
else if (foption->value != (*decoded_options)[j].value)
fatal_error (input_location,
"option %s not used consistently in all LTO input"
" files", foption->orig_option_with_args_text);
break;
case OPT_foffload_:
append_option (decoded_options, decoded_options_count, foption);
break;
}
}
/* Merge PIC options:
-fPIC + -fpic = -fpic
-fPIC + -fno-pic = -fno-pic
-fpic/-fPIC + nothing = nothing.
It is a common mistake to mix few -fPIC compiled objects into otherwise
non-PIC code. We do not want to build everything with PIC then.
Similarly we merge PIE options, however in addition we keep
-fPIC + -fPIE = -fPIE
-fpic + -fPIE = -fpie
-fPIC/-fpic + -fpie = -fpie
It would be good to warn on mismatches, but it is bit hard to do as
we do not know what nothing translates to. */
for (unsigned int j = 0; j < *decoded_options_count;)
if ((*decoded_options)[j].opt_index == OPT_fPIC
|| (*decoded_options)[j].opt_index == OPT_fpic)
{
/* -fno-pic in one unit implies -fno-pic everywhere. */
if ((*decoded_options)[j].value == 0)
j++;
/* If we have no pic option or merge in -fno-pic, we still may turn
existing pic/PIC mode into pie/PIE if -fpie/-fPIE is present. */
else if ((pic_option && pic_option->value == 0)
|| !pic_option)
{
if (pie_option)
{
bool big = (*decoded_options)[j].opt_index == OPT_fPIC
&& pie_option->opt_index == OPT_fPIE;
(*decoded_options)[j].opt_index = big ? OPT_fPIE : OPT_fpie;
if (pie_option->value)
(*decoded_options)[j].canonical_option[0]
= big ? "-fPIE" : "-fpie";
else
(*decoded_options)[j].canonical_option[0] = "-fno-pie";
(*decoded_options)[j].value = pie_option->value;
j++;
}
else if (pic_option)
{
(*decoded_options)[j] = *pic_option;
j++;
}
/* We do not know if target defaults to pic or not, so just remove
option if it is missing in one unit but enabled in other. */
else
remove_option (decoded_options, j, decoded_options_count);
}
else if (pic_option->opt_index == OPT_fpic
&& (*decoded_options)[j].opt_index == OPT_fPIC)
{
(*decoded_options)[j] = *pic_option;
j++;
}
else
j++;
}
else if ((*decoded_options)[j].opt_index == OPT_fPIE
|| (*decoded_options)[j].opt_index == OPT_fpie)
{
/* -fno-pie in one unit implies -fno-pie everywhere. */
if ((*decoded_options)[j].value == 0)
j++;
/* If we have no pie option or merge in -fno-pie, we still preserve
PIE/pie if pic/PIC is present. */
else if ((pie_option && pie_option->value == 0)
|| !pie_option)
{
/* If -fPIC/-fpic is given, merge it with -fPIE/-fpie. */
if (pic_option)
{
if (pic_option->opt_index == OPT_fpic
&& (*decoded_options)[j].opt_index == OPT_fPIE)
{
(*decoded_options)[j].opt_index = OPT_fpie;
(*decoded_options)[j].canonical_option[0]
= pic_option->value ? "-fpie" : "-fno-pie";
}
else if (!pic_option->value)
(*decoded_options)[j].canonical_option[0] = "-fno-pie";
(*decoded_options)[j].value = pic_option->value;
j++;
}
else if (pie_option)
{
(*decoded_options)[j] = *pie_option;
j++;
}
/* Because we always append pic/PIE options this code path should
not happen unless the LTO object was built by old lto1 which
did not contain that logic yet. */
else
remove_option (decoded_options, j, decoded_options_count);
}
else if (pie_option->opt_index == OPT_fpie
&& (*decoded_options)[j].opt_index == OPT_fPIE)
{
(*decoded_options)[j] = *pie_option;
j++;
}
else
j++;
}
else
j++;
if (!xassembler_options_error)
for (i = j = 0; ; i++, j++)
{
for (; i < *decoded_options_count; i++)
if ((*decoded_options)[i].opt_index == OPT_Xassembler)
break;
for (; j < fdecoded_options_count; j++)
if (fdecoded_options[j].opt_index == OPT_Xassembler)
break;
if (i == *decoded_options_count && j == fdecoded_options_count)
break;
else if (i < *decoded_options_count && j == fdecoded_options_count)
{
warning (0, "Extra option to -Xassembler: %s,"
" dropping all -Xassembler and -Wa options.",
(*decoded_options)[i].arg);
xassembler_options_error = true;
break;
}
else if (i == *decoded_options_count && j < fdecoded_options_count)
{
warning (0, "Extra option to -Xassembler: %s,"
" dropping all -Xassembler and -Wa options.",
fdecoded_options[j].arg);
xassembler_options_error = true;
break;
}
else if (strcmp ((*decoded_options)[i].arg, fdecoded_options[j].arg))
{
warning (0, "Options to Xassembler do not match: %s, %s,"
" dropping all -Xassembler and -Wa options.",
(*decoded_options)[i].arg, fdecoded_options[j].arg);
xassembler_options_error = true;
break;
}
}
}
/* Auxiliary function that frees elements of PTR and PTR itself.
N is number of elements to be freed. If PTR is NULL, nothing is freed.
If an element is NULL, subsequent elements are not freed. */
static void **
free_array_of_ptrs (void **ptr, unsigned n)
{
if (!ptr)
return NULL;
for (unsigned i = 0; i < n; i++)
{
if (!ptr[i])
break;
free (ptr[i]);
}
free (ptr);
return NULL;
}
/* Parse STR, saving found tokens into PVALUES and return their number.
Tokens are assumed to be delimited by ':'. If APPEND is non-null,
append it to every token we find. */
static unsigned
parse_env_var (const char *str, char ***pvalues, const char *append)
{
const char *curval, *nextval;
char **values;
unsigned num = 1, i;
curval = strchr (str, ':');
while (curval)
{
num++;
curval = strchr (curval + 1, ':');
}
values = (char**) xmalloc (num * sizeof (char*));
curval = str;
nextval = strchr (curval, ':');
if (nextval == NULL)
nextval = strchr (curval, '\0');
int append_len = append ? strlen (append) : 0;
for (i = 0; i < num; i++)
{
int l = nextval - curval;
values[i] = (char*) xmalloc (l + 1 + append_len);
memcpy (values[i], curval, l);
values[i][l] = 0;
if (append)
strcat (values[i], append);
curval = nextval + 1;
nextval = strchr (curval, ':');
if (nextval == NULL)
nextval = strchr (curval, '\0');
}
*pvalues = values;
return num;
}
/* Append options OPTS from lto or offload_lto sections to ARGV_OBSTACK. */
static void
append_compiler_options (obstack *argv_obstack, struct cl_decoded_option *opts,
unsigned int count)
{
/* Append compiler driver arguments as far as they were merged. */
for (unsigned int j = 1; j < count; ++j)
{
struct cl_decoded_option *option = &opts[j];
/* File options have been properly filtered by lto-opts.c. */
switch (option->opt_index)
{
/* Drop arguments that we want to take from the link line. */
case OPT_flto_:
case OPT_flto:
case OPT_flto_partition_:
continue;
default:
break;
}
/* For now do what the original LTO option code was doing - pass
on any CL_TARGET flag and a few selected others. */
switch (option->opt_index)
{
case OPT_fdiagnostics_show_caret:
case OPT_fdiagnostics_show_labels:
case OPT_fdiagnostics_show_line_numbers:
case OPT_fdiagnostics_show_option:
case OPT_fdiagnostics_show_location_:
case OPT_fshow_column:
case OPT_fPIC:
case OPT_fpic:
case OPT_fPIE:
case OPT_fpie:
case OPT_fcommon:
case OPT_fgnu_tm:
case OPT_fopenmp:
case OPT_fopenacc:
case OPT_fopenacc_dim_:
case OPT_foffload_abi_:
case OPT_g:
case OPT_O:
case OPT_Ofast:
case OPT_Og:
case OPT_Os:
break;
case OPT_Xassembler:
/* When we detected a mismatch in assembler options between
the input TU's fall back to previous behavior of ignoring them. */
if (xassembler_options_error)
continue;
break;
default:
if (!(cl_options[option->opt_index].flags & CL_TARGET))
continue;
}
/* Pass the option on. */
for (unsigned int i = 0; i < option->canonical_option_num_elements; ++i)
obstack_ptr_grow (argv_obstack, option->canonical_option[i]);
}
}
/* Append diag options in OPTS with length COUNT to ARGV_OBSTACK. */
static void
append_diag_options (obstack *argv_obstack, struct cl_decoded_option *opts,
unsigned int count)
{
/* Append compiler driver arguments as far as they were merged. */
for (unsigned int j = 1; j < count; ++j)
{
struct cl_decoded_option *option = &opts[j];
switch (option->opt_index)
{
case OPT_fdiagnostics_color_:
case OPT_fdiagnostics_format_:
case OPT_fdiagnostics_show_caret:
case OPT_fdiagnostics_show_labels:
case OPT_fdiagnostics_show_line_numbers:
case OPT_fdiagnostics_show_option:
case OPT_fdiagnostics_show_location_:
case OPT_fshow_column:
break;
default:
continue;
}
/* Pass the option on. */
for (unsigned int i = 0; i < option->canonical_option_num_elements; ++i)
obstack_ptr_grow (argv_obstack, option->canonical_option[i]);
}
}
/* Append linker options OPTS to ARGV_OBSTACK. */
static void
append_linker_options (obstack *argv_obstack, struct cl_decoded_option *opts,
unsigned int count)
{
/* Append linker driver arguments. Compiler options from the linker
driver arguments will override / merge with those from the compiler. */
for (unsigned int j = 1; j < count; ++j)
{
struct cl_decoded_option *option = &opts[j];
/* Do not pass on frontend specific flags not suitable for lto. */
if (!(cl_options[option->opt_index].flags
& (CL_COMMON|CL_TARGET|CL_DRIVER|CL_LTO)))
continue;
switch (option->opt_index)
{
case OPT_o:
case OPT_flto_:
case OPT_flto:
/* We've handled these LTO options, do not pass them on. */
continue;
case OPT_fopenmp:
case OPT_fopenacc:
/* Ignore -fno-XXX form of these options, as otherwise
corresponding builtins will not be enabled. */
if (option->value == 0)
continue;
break;
default:
break;
}
/* Pass the option on. */
for (unsigned int i = 0; i < option->canonical_option_num_elements; ++i)
obstack_ptr_grow (argv_obstack, option->canonical_option[i]);
}
}
/* Extract options for TARGET offload compiler from OPTIONS and append
them to ARGV_OBSTACK. */
static void
append_offload_options (obstack *argv_obstack, const char *target,
struct cl_decoded_option *options,
unsigned int options_count)
{
for (unsigned i = 0; i < options_count; i++)
{
const char *cur, *next, *opts;
char **argv;
unsigned argc;
struct cl_decoded_option *option = &options[i];
if (option->opt_index != OPT_foffload_)
continue;
/* If option argument starts with '-' then no target is specified. That
means offload options are specified for all targets, so we need to
append them. */
if (option->arg[0] == '-')
opts = option->arg;
else
{
opts = strchr (option->arg, '=');
/* If there are offload targets specified, but no actual options,
there is nothing to do here. */
if (!opts)
continue;
cur = option->arg;
while (cur < opts)
{
next = strchr (cur, ',');
if (next == NULL)
next = opts;
next = (next > opts) ? opts : next;
/* Are we looking for this offload target? */
if (strlen (target) == (size_t) (next - cur)
&& strncmp (target, cur, next - cur) == 0)
break;
/* Skip the comma or equal sign. */
cur = next + 1;
}
if (cur >= opts)
continue;
opts++;
}
argv = buildargv (opts);
for (argc = 0; argv[argc]; argc++)
obstack_ptr_grow (argv_obstack, argv[argc]);
}
}
/* Check whether NAME can be accessed in MODE. This is like access,
except that it never considers directories to be executable. */
static int
access_check (const char *name, int mode)
{
if (mode == X_OK)
{
struct stat st;
if (stat (name, &st) < 0
|| S_ISDIR (st.st_mode))
return -1;
}
return access (name, mode);
}
/* Prepare a target image for offload TARGET, using mkoffload tool from
COMPILER_PATH. Return the name of the resultant object file. */
static char *
compile_offload_image (const char *target, const char *compiler_path,
unsigned in_argc, char *in_argv[],
struct cl_decoded_option *compiler_opts,
unsigned int compiler_opt_count,
struct cl_decoded_option *linker_opts,
unsigned int linker_opt_count)
{
char *filename = NULL;
char **argv;
char *suffix
= XALLOCAVEC (char, sizeof ("/accel//mkoffload") + strlen (target));
strcpy (suffix, "/accel/");
strcat (suffix, target);
strcat (suffix, "/mkoffload");
char **paths = NULL;
unsigned n_paths = parse_env_var (compiler_path, &paths, suffix);
const char *compiler = NULL;
for (unsigned i = 0; i < n_paths; i++)
if (access_check (paths[i], X_OK) == 0)
{
compiler = paths[i];
break;
}
if (!compiler)
fatal_error (input_location,
"could not find %s in %s (consider using %<-B%>)",
suffix + 1, compiler_path);
/* Generate temporary output file name. */
filename = make_temp_file (".target.o");
struct obstack argv_obstack;
obstack_init (&argv_obstack);
obstack_ptr_grow (&argv_obstack, compiler);
if (save_temps)
obstack_ptr_grow (&argv_obstack, "-save-temps");
if (verbose)
obstack_ptr_grow (&argv_obstack, "-v");
obstack_ptr_grow (&argv_obstack, "-o");
obstack_ptr_grow (&argv_obstack, filename);
/* Append names of input object files. */
for (unsigned i = 0; i < in_argc; i++)
obstack_ptr_grow (&argv_obstack, in_argv[i]);
/* Append options from offload_lto sections. */
append_compiler_options (&argv_obstack, compiler_opts,
compiler_opt_count);
append_diag_options (&argv_obstack, linker_opts, linker_opt_count);
/* Append options specified by -foffload last. In case of conflicting
options we expect offload compiler to choose the latest. */
append_offload_options (&argv_obstack, target, compiler_opts,
compiler_opt_count);
append_offload_options (&argv_obstack, target, linker_opts,
linker_opt_count);
obstack_ptr_grow (&argv_obstack, NULL);
argv = XOBFINISH (&argv_obstack, char **);
fork_execute (argv[0], argv, true);
obstack_free (&argv_obstack, NULL);
free_array_of_ptrs ((void **) paths, n_paths);
return filename;
}
/* The main routine dealing with offloading.
The routine builds a target image for each offload target. IN_ARGC and
IN_ARGV specify options and input object files. As all of them could contain
target sections, we pass them all to target compilers. */
static void
compile_images_for_offload_targets (unsigned in_argc, char *in_argv[],
struct cl_decoded_option *compiler_opts,
unsigned int compiler_opt_count,
struct cl_decoded_option *linker_opts,
unsigned int linker_opt_count)
{
char **names = NULL;
const char *target_names = getenv (OFFLOAD_TARGET_NAMES_ENV);
if (!target_names)
return;
unsigned num_targets = parse_env_var (target_names, &names, NULL);
int next_name_entry = 0;
const char *compiler_path = getenv ("COMPILER_PATH");
if (!compiler_path)
goto out;
/* Prepare an image for each target and save the name of the resultant object
file to the OFFLOAD_NAMES array. It is terminated by a NULL entry. */
offload_names = XCNEWVEC (char *, num_targets + 1);
for (unsigned i = 0; i < num_targets; i++)
{
/* HSA does not use LTO-like streaming and a different compiler, skip
it. */
if (strcmp (names[i], "hsa") == 0)
continue;
offload_names[next_name_entry]
= compile_offload_image (names[i], compiler_path, in_argc, in_argv,
compiler_opts, compiler_opt_count,
linker_opts, linker_opt_count);
if (!offload_names[next_name_entry])
fatal_error (input_location,
"problem with building target image for %s", names[i]);
next_name_entry++;
}
out:
free_array_of_ptrs ((void **) names, num_targets);
}
/* Copy a file from SRC to DEST. */
static void
copy_file (const char *dest, const char *src)
{
FILE *d = fopen (dest, "wb");
FILE *s = fopen (src, "rb");
char buffer[512];
while (!feof (s))
{
size_t len = fread (buffer, 1, 512, s);
if (ferror (s) != 0)
fatal_error (input_location, "reading input file");
if (len > 0)
{
fwrite (buffer, 1, len, d);
if (ferror (d) != 0)
fatal_error (input_location, "writing output file");
}
}
fclose (d);
fclose (s);
}
/* Find the crtoffloadtable.o file in LIBRARY_PATH, make copy and pass name of
the copy to the linker. */
static void
find_crtoffloadtable (void)
{
char **paths = NULL;
const char *library_path = getenv ("LIBRARY_PATH");
if (!library_path)
return;
unsigned n_paths = parse_env_var (library_path, &paths, "/crtoffloadtable.o");
unsigned i;
for (i = 0; i < n_paths; i++)
if (access_check (paths[i], R_OK) == 0)
{
/* The linker will delete the filename we give it, so make a copy. */
char *crtoffloadtable = make_temp_file (".crtoffloadtable.o");
copy_file (crtoffloadtable, paths[i]);
printf ("%s\n", crtoffloadtable);
XDELETEVEC (crtoffloadtable);
break;
}
if (i == n_paths)
fatal_error (input_location,
"installation error, cannot find %<crtoffloadtable.o%>");
free_array_of_ptrs ((void **) paths, n_paths);
}
/* A subroutine of run_gcc. Examine the open file FD for lto sections with
name prefix PREFIX, at FILE_OFFSET, and store any options we find in OPTS
and OPT_COUNT. Return true if we found a matchingn section, false
otherwise. COLLECT_GCC holds the value of the environment variable with
the same name. */
static bool
find_and_merge_options (int fd, off_t file_offset, const char *prefix,
struct cl_decoded_option **opts,
unsigned int *opt_count, const char *collect_gcc)
{
off_t offset, length;