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# Copyright (C) 1999, 2001, 2003 Free Software Foundation, Inc.
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Please email any bugs, comments, and/or additions to this file to:
# gcc-patches@gcc.gnu.org
# This file defines procs for determining features supported by the target.
###############################
# proc check_weak_available { }
###############################
# weak symbols are only supported in some configs/object formats
# this proc returns 1 if they're supported, 0 if they're not, or -1 if unsure
proc check_weak_available { } {
global target_triplet
global target_cpu
# All mips targets should support it
if { [ string first "mips" $target_cpu ] >= 0 } {
return 1
}
# All solaris2 targets should support it
if { [regexp ".*-solaris2.*" $target_triplet] } {
return 1
}
# DEC OSF/1/Digital UNIX/Tru64 UNIX supports it
if { [regexp "alpha.*osf.*" $target_triplet] } {
return 1
}
# ELF and ECOFF support it. a.out does with gas/gld but may also with
# other linkers, so we should try it
set objformat [gcc_target_object_format]
switch $objformat {
elf { return 1 }
ecoff { return 1 }
a.out { return 1 }
unknown { return -1 }
default { return 0 }
}
}
###############################
# proc check_alias_available { }
###############################
# Determine if the target toolchain supports the alias attribute.
# Returns 2 if the target supports aliases. Returns 1 if the target
# only supports weak aliased. Returns 0 if the target does not
# support aliases at all. Returns -1 if support for aliases could not
# be determined.
proc check_alias_available { } {
global alias_available_saved
if [info exists alias_available_saved] {
verbose "check_alias_available returning saved $alias_available_saved" 2
} else {
verbose "check_alias_available compiling testfile" 2
set f [open "tmp.c" "w"]
# Compile a small test program. The definition of "g" is
# necessary to keep the Solaris assembler from complaining
# about the program.
puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
close $f
set lines [gcc_target_compile "tmp.c" "tmp.o" object ""]
file delete "tmp.c"
if [string match "" $lines] then {
# No error messages, everything is OK.
set alias_available_saved 2
} else {
if [regexp "alias definitions not supported" $lines] {
verbose "check_alias_available target does not support aliases" 2
set objformat [gcc_target_object_format]
if { $objformat == "elf" } {
verbose "check_alias_available but target uses ELF format, so it ought to" 2
set alias_available_saved -1
} else {
set alias_available_saved 0
}
} else {
if [regexp "only weak aliases are supported" $lines] {
verbose "check_alias_available target supports only weak aliases" 2
set alias_available_saved 1
} else {
set alias_available_saved -1
}
}
}
verbose "check_alias_available returning $alias_available_saved" 2
}
return $alias_available_saved
}
# Returns true if --gc-sections is supported on the target.
proc check_gc_sections_available { } {
global gc_sections_available_saved
if {![info exists gc_sections_available_saved]} {
# Check if the ld used by gcc supports --gc-sections.
set gcc_ld [lindex [gcc_target_compile "-print-prog-name=ld" "" "none" ""] 0]
set ld_output [remote_exec host "$gcc_ld" "--help"]
if { [ string first "--gc-sections" $ld_output ] >= 0 } {
set gc_sections_available_saved 1
} else {
set gc_sections_available_saved 0
}
}
return $gc_sections_available_saved
}
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