+
+# Set LD_CLASS to "64bit" for a 64-bit *host* linker.
+if { ![info exists LD_CLASS] } then {
+ set REAL_LD [findfile $base_dir/.libs/ld-new .libs/ld-new $LD [transform ld]]
+ set readelf_output [run_host_cmd "$READELF" "-h $REAL_LD"]
+ if { [regexp {[ \t]+Class:[ \t]+ELF64} $readelf_output] } then {
+ set LD_CLASS "64bit"
+ } else {
+ set LD_CLASS "32bit"
+ }
+}
+
+# Set PLT_CFLAGS to "-fplt" if target compiler supports it.
+
+if { ![info exists PLT_CFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -fplt
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/plt[pid]"
+ set src ${basename}.c
+ set output ${basename}.o
+ set f [open $src "w"]
+ puts $f ""
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set plt_available [run_host_cmd_yesno "$CC" "$flags -c -fplt $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $plt_available == 1 } then {
+ set PLT_CFLAGS "-fplt"
+ } else {
+ set PLT_CFLAGS ""
+ }
+ } else {
+ set PLT_CFLAGS ""
+ }
+}
+
+# Set NOPIE_CFLAGS to "-fno-PIE" and NOPIE_LDFLAGS to "-no-pie" if
+# target compiler supports them.
+
+if { ![info exists NOPIE_CFLAGS] || ![info exists NOPIE_LDFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -fno-PIE -no-pie.
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/nopie[pid]"
+ set src ${basename}.c
+ set output ${basename}
+ set f [open $src "w"]
+ puts $f "int main (void) { return 0; }"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set nopie_available [run_host_cmd_yesno "$CC" "$flags -fno-PIE -no-pie $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $nopie_available == 1 } then {
+ set NOPIE_CFLAGS "-fno-PIE"
+ set NOPIE_LDFLAGS "-no-pie"
+ } else {
+ set NOPIE_CFLAGS ""
+ set NOPIE_LDFLAGS ""
+ }
+ } else {
+ set NOPIE_CFLAGS ""
+ set NOPIE_LDFLAGS ""
+ }
+}
+
+# Set NOCF_PROTECTION_CFLAGS to "-fcf-protection=none" if target compiler
+# supports it.
+
+if { ![info exists NOCF_PROTECTION_CFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -fcf-protection=none.
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/available[pid]"
+ set src ${basename}.c
+ set output ${basename}
+ set f [open $src "w"]
+ puts $f "int main (void) { return 0; }"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set available [run_host_cmd_yesno "$CC" "$flags -fcf-protection=none $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $available == 1 } then {
+ set NOCF_PROTECTION_CFLAGS "-fcf-protection=none"
+ } else {
+ set NOCF_PROTECTION_CFLAGS ""
+ }
+ } else {
+ set NOCF_PROTECTION_CFLAGS ""
+ }
+}
+
+# Set GNU2_CFLAGS to "-mtls-dialect=gnu2" if target compiler supports it.
+
+if { ![info exists GNU2_CFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -mtls-dialect=gnu2
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/gnu2[pid]"
+ set src ${basename}.c
+ set output ${basename}.o
+ set f [open $src "w"]
+ puts $f "__thread int yyy = 100;"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set gnu2_available [run_host_cmd_yesno "$CC" "$flags -c -mtls-dialect=gnu2 $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $gnu2_available == 1 } then {
+ set GNU2_CFLAGS "-mtls-dialect=gnu2"
+ } else {
+ set GNU2_CFLAGS ""
+ }
+ } else {
+ set GNU2_CFLAGS ""
+ }
+}
+
+# Set INT128_CFLAGS to "-DHAS_INT128" if target compiler supports __int128.
+
+if { ![info exists INT128_CFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports __int128.
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/int128[pid]"
+ set src ${basename}.c
+ set output ${basename}.o
+ set f [open $src "w"]
+ puts $f "__int128 a = 42;"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set int128_available [run_host_cmd_yesno "$CC" "$flags -c $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $int128_available == 1 } then {
+ set INT128_CFLAGS "-DHAS_INT128"
+ } else {
+ set INT128_CFLAGS ""
+ }
+ } else {
+ set INT128_CFLAGS ""
+ }
+}
+
+# Set STATIC_LDFLAGS to "-static" if target compiler supports it.
+
+if { ![info exists STATIC_LDFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -static.
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/static[pid]"
+ set src ${basename}.c
+ set output ${basename}
+ set f [open $src "w"]
+ puts $f "int main (void) { return 0; }"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set static_available [run_host_cmd_yesno "$CC" "-static $flags $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $static_available == 1 } then {
+ set STATIC_LDFLAGS "-static"
+ } else {
+ set STATIC_LDFLAGS ""
+ }
+ } else {
+ set STATIC_LDFLAGS ""
+ }
+}
+
+# Set STATIC_PIE_LDFLAGS to "-static-pie" if target compiler supports it.
+
+if { ![info exists STATIC_PIE_LDFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -static-pie.
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/static[pid]"
+ set src ${basename}.c
+ set output ${basename}
+ set f [open $src "w"]
+ puts $f "int main (void) { return 0; }"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set static_available [run_host_cmd_yesno "$CC" "-static-pie $flags $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $static_available == 1 } then {
+ set STATIC_PIE_LDFLAGS "-static-pie"
+ } else {
+ set STATIC_PIE_LDFLAGS ""
+ }
+ } else {
+ set STATIC_PIE_LDFLAGS ""
+ }
+}
+
+# Set NOSANTIZE_CFLAGS to "-fno-sanitize=all" if target compiler
+# supports it.
+
+if { ![info exists NOSANTIZE_CFLAGS] } then {
+ if { [check_compiler_available] } {
+ # Check if gcc supports -fno-sanitize=all.
+ set flags ""
+ if [board_info [target_info name] exists cflags] {
+ append flags " [board_info [target_info name] cflags]"
+ }
+ if [board_info [target_info name] exists ldflags] {
+ append flags " [board_info [target_info name] ldflags]"
+ }
+
+ set basename "tmpdir/available[pid]"
+ set src ${basename}.c
+ set output ${basename}
+ set f [open $src "w"]
+ puts $f "int main (void) { return 0; }"
+ close $f
+ if [is_remote host] {
+ set src [remote_download host $src]
+ }
+ set available [run_host_cmd_yesno "$CC" "$flags -fno-sanitize=all $src -o $output"]
+ remote_file host delete $src
+ remote_file host delete $output
+ file delete $src
+
+ if { $available == 1 } then {
+ set NOSANTIZE_CFLAGS "-fno-sanitize=all"
+ } else {
+ set NOSANTIZE_CFLAGS ""
+ }
+ } else {
+ set NOSANTIZE_CFLAGS ""
+ }
+}