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/* gospec.c -- Specific flags and argument handling of the gcc Go front end.
Copyright (C) 2009-2019 Free Software Foundation, Inc.
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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "opts.h"
/* This bit is set if we saw a `-xfoo' language specification. */
#define LANGSPEC (1<<1)
/* This bit is set if they did `-lm' or `-lmath'. */
#define MATHLIB (1<<2)
/* This bit is set if they did `-lpthread'. */
#define THREADLIB (1<<3)
/* This bit is set if they did `-lc'. */
#define WITHLIBC (1<<4)
/* Skip this option. */
#define SKIPOPT (1<<5)
#ifndef MATH_LIBRARY
#define MATH_LIBRARY "m"
#endif
#ifndef MATH_LIBRARY_PROFILE
#define MATH_LIBRARY_PROFILE MATH_LIBRARY
#endif
#define THREAD_LIBRARY "pthread"
#define THREAD_LIBRARY_PROFILE THREAD_LIBRARY
#define LIBGO "go"
#define LIBGO_PROFILE LIBGO
#define LIBGOBEGIN "gobegin"
void
lang_specific_driver (struct cl_decoded_option **in_decoded_options,
unsigned int *in_decoded_options_count,
int *in_added_libraries)
{
unsigned int i, j;
/* If true, the user gave us the `-p' or `-pg' flag. */
bool saw_profile_flag = false;
/* This is a tristate:
-1 means we should not link in libgo
0 means we should link in libgo if it is needed
1 means libgo is needed and should be linked in.
2 means libgo is needed and should be linked statically. */
int library = 0;
/* The new argument list will be contained in this. */
struct cl_decoded_option *new_decoded_options;
/* "-lm" or "-lmath" if it appears on the command line. */
const struct cl_decoded_option *saw_math = 0;
/* "-lpthread" if it appears on the command line. */
const struct cl_decoded_option *saw_thread = 0;
/* "-lc" if it appears on the command line. */
const struct cl_decoded_option *saw_libc = 0;
/* An array used to flag each argument that needs a bit set for
LANGSPEC, MATHLIB, or WITHLIBC. */
int *args;
/* Whether we need the thread library. */
int need_thread = 0;
/* By default, we throw on the math library if we have one. */
int need_math = (MATH_LIBRARY[0] != '\0');
/* True if we saw -static. */
int static_link = 0;
/* True if we should add -shared-libgcc to the command-line. */
int shared_libgcc = 1;
/* The total number of arguments with the new stuff. */
unsigned int argc;
/* The argument list. */
struct cl_decoded_option *decoded_options;
/* The number of libraries added in. */
int added_libraries;
/* The total number of arguments with the new stuff. */
int num_args = 1;
/* Supports split stack */
int supports_split_stack = 0;
/* Whether the -o option was used. */
bool saw_opt_o = false;
/* Whether the -c option was used. Also used for -E, -fsyntax-only,
in general anything which implies only compilation and not
linking. */
bool saw_opt_c = false;
/* Whether the -S option was used. */
bool saw_opt_S = false;
#ifdef TARGET_CAN_SPLIT_STACK_64BIT
/* Whether the -m64 option is in force. */
bool is_m64 = TARGET_CAN_SPLIT_STACK_64BIT;
#endif
/* The first input file with an extension of .go. */
const char *first_go_file = NULL;
argc = *in_decoded_options_count;
decoded_options = *in_decoded_options;
added_libraries = *in_added_libraries;
args = XCNEWVEC (int, argc);
for (i = 1; i < argc; i++)
{
const char *arg = decoded_options[i].arg;
switch (decoded_options[i].opt_index)
{
case OPT_r:
case OPT_nostdlib:
case OPT_nodefaultlibs:
library = -1;
break;
case OPT_l:
if (strcmp (arg, MATH_LIBRARY) == 0)
{
args[i] |= MATHLIB;
need_math = 0;
}
else if (strcmp (arg, THREAD_LIBRARY) == 0)
args[i] |= THREADLIB;
else if (strcmp (arg, "c") == 0)
args[i] |= WITHLIBC;
else
/* Unrecognized libraries (e.g. -lfoo) may require libgo. */
library = (library == 0) ? 1 : library;
break;
#ifdef TARGET_CAN_SPLIT_STACK_64BIT
case OPT_m32:
is_m64 = false;
break;
case OPT_m64:
is_m64 = true;
break;
#endif
case OPT_pg:
case OPT_p:
saw_profile_flag = true;
break;
case OPT_x:
if (library == 0 && strcmp (arg, "go") == 0)
library = 1;
break;
case OPT_Xlinker:
case OPT_Wl_:
/* Arguments that go directly to the linker might be .o files,
or something, and so might cause libgo to be needed. */
if (library == 0)
library = 1;
break;
case OPT_c:
case OPT_E:
case OPT_M:
case OPT_MM:
case OPT_fsyntax_only:
/* Don't specify libraries if we won't link, since that would
cause a warning. */
saw_opt_c = true;
library = -1;
break;
case OPT_S:
saw_opt_S = true;
library = -1;
break;
case OPT_o:
saw_opt_o = true;
break;
case OPT_static:
static_link = 1;
break;
case OPT_static_libgcc:
shared_libgcc = 0;
break;
case OPT_static_libgo:
library = library >= 0 ? 2 : library;
args[i] |= SKIPOPT;
break;
case OPT_SPECIAL_input_file:
if (library == 0)
library = 1;
if (first_go_file == NULL)
{
int len;
len = strlen (arg);
if (len > 3 && strcmp (arg + len - 3, ".go") == 0)
first_go_file = arg;
}
break;
}
}
/* There's no point adding -shared-libgcc if we don't have a shared
libgcc. */
#ifndef ENABLE_SHARED_LIBGCC
shared_libgcc = 0;
#endif
/* Make sure to have room for the trailing NULL argument. */
num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 10;
new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
i = 0;
j = 0;
/* Copy the 0th argument, i.e., the name of the program itself. */
new_decoded_options[j++] = decoded_options[i++];
#ifdef TARGET_CAN_SPLIT_STACK
supports_split_stack = 1;
#endif
#ifdef TARGET_CAN_SPLIT_STACK_64BIT
if (is_m64)
supports_split_stack = 1;
#endif
/* If we are linking, pass -fsplit-stack if it is supported. */
if ((library >= 0) && supports_split_stack)
{
generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
/* NOTE: We start at 1 now, not 0. */
while (i < argc)
{
new_decoded_options[j] = decoded_options[i];
/* Make sure -lgo is before the math library, since libgo itself
uses those math routines. */
if (!saw_math && (args[i] & MATHLIB) && library > 0)
{
--j;
saw_math = &decoded_options[i];
}
if (!saw_thread && (args[i] & THREADLIB) && library > 0)
{
--j;
saw_thread = &decoded_options[i];
}
if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
{
--j;
saw_libc = &decoded_options[i];
}
if ((args[i] & SKIPOPT) != 0)
--j;
i++;
j++;
}
/* If we didn't see a -o option, add one. This is because we need
the driver to pass all .go files to go1. Without a -o option the
driver will invoke go1 separately for each input file. FIXME:
This should probably use some other interface to force the driver
to set combine_inputs. */
if (first_go_file != NULL && !saw_opt_o)
{
if (saw_opt_c || saw_opt_S)
{
const char *base;
int baselen;
int alen;
char *out;
base = lbasename (first_go_file);
baselen = strlen (base) - 3;
alen = baselen + 3;
out = XNEWVEC (char, alen);
memcpy (out, base, baselen);
/* The driver will convert .o to some other suffix (e.g.,
.obj) if appropriate. */
out[baselen] = '.';
if (saw_opt_S)
out[baselen + 1] = 's';
else
out[baselen + 1] = 'o';
out[baselen + 2] = '\0';
generate_option (OPT_o, out, 1, CL_DRIVER,
&new_decoded_options[j]);
}
else
generate_option (OPT_o, "a.out", 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
/* Add `-lgo' if we haven't already done so. */
if (library > 0)
{
generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER,
&new_decoded_options[j]);
added_libraries++;
j++;
#ifdef HAVE_LD_STATIC_DYNAMIC
if (library > 1 && !static_link)
{
generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
#endif
generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1,
CL_DRIVER, &new_decoded_options[j]);
added_libraries++;
j++;
#ifdef HAVE_LD_STATIC_DYNAMIC
if (library > 1 && !static_link)
{
generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
#endif
/* When linking libgo statically we also need to link with the
pthread library. */
if (library > 1 || static_link)
need_thread = 1;
}
if (saw_thread)
new_decoded_options[j++] = *saw_thread;
else if (library > 0 && need_thread)
{
generate_option (OPT_l,
(saw_profile_flag
? THREAD_LIBRARY_PROFILE
: THREAD_LIBRARY),
1, CL_DRIVER, &new_decoded_options[j]);
added_libraries++;
j++;
}
if (saw_math)
new_decoded_options[j++] = *saw_math;
else if (library > 0 && need_math)
{
generate_option (OPT_l,
saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
1, CL_DRIVER, &new_decoded_options[j]);
added_libraries++;
j++;
}
if (saw_libc)
new_decoded_options[j++] = *saw_libc;
if (shared_libgcc && !static_link)
generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
&new_decoded_options[j++]);
/* libgcc wraps pthread_create to support split stack, however, due to
relative ordering of -lpthread and -lgcc, we can't just mark
__real_pthread_create in libgcc as non-weak. But we need to link in
pthread_create from pthread if we are statically linking, so we work-
around by passing -u pthread_create to the linker. */
if (static_link && supports_split_stack)
{
generate_option (OPT_Wl_, "-u,pthread_create", 1, CL_DRIVER,
&new_decoded_options[j]);
j++;
}
#if defined(TARGET_SOLARIS) && !defined(USE_GLD)
/* We use a common symbol for go$zerovalue. On Solaris, when not
using the GNU linker, the Solaris linker needs an option to not
warn about this. Everything works without this option, but you
get unsightly warnings at link time. */
generate_option (OPT_Wl_, "-t", 1, CL_DRIVER, &new_decoded_options[j]);
j++;
#endif
*in_decoded_options_count = j;
*in_decoded_options = new_decoded_options;
*in_added_libraries = added_libraries;
}
/* Called before linking. Returns 0 on success and -1 on failure. */
int lang_specific_pre_link (void) /* Not used for Go. */
{
return 0;
}
/* Number of extra output files that lang_specific_pre_link may generate. */
int lang_specific_extra_outfiles = 0; /* Not used for Go. */