target-supports.exp [plain text]
# 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_visibility_available { }
###############################
# The visibility attribute is only support in some object formats
# This proc returns 1 if it is supported, 0 if not, -1 if unsure.
proc check_visibility_available { } {
global target_triplet
global target_cpu
# ELF supports it if the system has recent GNU ld and gas.
# As a start we return 1 for all ELF systems; we'll let people
# add exceptions as necessary.
set objformat [gcc_target_object_format]
switch $objformat {
elf { 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
global tool
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 "#ifdef __cplusplus\nextern \"C\"\n#endif\n"
puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
close $f
set lines [${tool}_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 $alias_available_saved
}
# Returns true if --gc-sections is supported on the target.
proc check_gc_sections_available { } {
global gc_sections_available_saved
global tool
if {![info exists gc_sections_available_saved]} {
# Check if the ld used by gcc supports --gc-sections.
set gcc_ld [lindex [${tool}_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 $gc_sections_available_saved
}
# Return true if profiling is supported on the target.
proc check_profiling_available { test_what } {
global profiling_available_saved
verbose "Profiling argument is <$test_what>" 1
# These conditions depend on the argument so examine them before
# looking at the cache variable.
# Support for -p on solaris2 relies on mcrt1.o which comes with the
# vendor compiler. We cannot reliably predict the directory where the
# vendor compiler (and thus mcrt1.o) is installed so we can't
# necessarily find mcrt1.o even if we have it.
if { [istarget *-*-solaris2*] && [lindex $test_what 1] == "-p" } {
return 0
}
# Support for -p on irix relies on libprof1.a which doesn't appear to
# exist on any irix6 system currently posting testsuite results.
# Support for -pg on irix relies on gcrt1.o which doesn't exist yet.
# See: http://gcc.gnu.org/ml/gcc/2002-10/msg00169.html
if { [istarget mips*-*-irix*]
&& ([lindex $test_what 1] == "-p" || [lindex $test_what 1] == "-pg") } {
return 0
}
# Now examine the cache variable.
if {![info exists profiling_available_saved]} {
# Some targets don't have any implementation of __bb_init_func or are
# missing other needed machinery.
if { [istarget mmix-*-*]
|| [istarget arm*-*-elf]
|| [istarget powerpc-*-eabi*]
|| [istarget strongarm*-*-elf]
|| [istarget xscale*-*-elf]
|| [istarget cris-*-*]
|| [istarget h8300-*-*]
|| [istarget mips*-*-elf]
|| [istarget *-*-windiss] } {
set profiling_available_saved 0
} else {
set profiling_available_saved 1
}
}
return $profiling_available_saved
}
# Return true if iconv is supported on the target. In particular IBM-1047.
proc check_iconv_available { test_what } {
global tool
global libiconv
set result ""
verbose "check_iconv_available compiling testfile" 1
set f [open "tmp.c" "w"]
# Compile a small test program.
puts $f "#include <iconv.h>\n"
puts $f "int main (void)\n {\n iconv_t cd; \n"
puts $f "cd = iconv_open (\"[lindex $test_what 1]\", \"UTF-8\");\n"
puts $f "if (cd == (iconv_t) -1)\n return 1;\n"
puts $f "return 0;\n}"
close $f
set lines [${tool}_target_compile "tmp.c" "tmp.x" executable "libs=$libiconv" ]
if [string match "" $lines] then {
# No error messages, everything is OK.
set result [${tool}_load "./tmp.x" "" ""]
set status [lindex $result 0];
verbose "status is <$status>"
if { $status == "pass" } then {
return 1
}
}
return 0
}
# Return true if named sections are supported on this target.
# This proc does not cache results, because the answer may vary
# when cycling over subtarget options (e.g. irix o32/n32/n64) in
# the same test run.
proc check_named_sections_available { } {
global tool
set f [open "tmp.c" "w"]
# Compile a small test program.
puts $f "int __attribute__ ((section(\"whatever\"))) foo;"
close $f
set lines [${tool}_target_compile "tmp.c" "tmp.o" object ""]
file delete "tmp.c"
# If we got no error messages, everything is OK.
set answer [string match "" $lines]
verbose "check_named_sections_available returning $answer" 2
return $answer
}