Let each 'lto_init' determine the default 'LTO_OPTIONS', and 'torture…

…-init' the 'LTO_TORTURE_OPTIONS'

Otherwise, for example for 'RUNTESTFLAGS' of '--target_board=unix\{-m64,-m32\}'
vs. '--target_board=unix\{-m32,-m64\}', both variants exercise testing with
always the first flag variant's 'LTO_OPTIONS'/'LTO_TORTURE_OPTIONS', which
results in unequal test results between the two 'RUNTESTFLAGS' variants if one
of the flag variants has 'check_linker_plugin_available' but the other doesn't.

Fix-up for r180245 (commit c1a7cdb)
"Update testsuite to run with slim LTO".

	gcc/testsuite/
	* g++.dg/guality/guality.exp: Move 'torture-init' earlier.
	* gcc.dg/guality/guality.exp: Likewise.
	* gfortran.dg/guality/guality.exp: Likewise.
	* lib/c-torture.exp (LTO_TORTURE_OPTIONS): Don't set.
	* lib/gcc-dg.exp (LTO_TORTURE_OPTIONS): Don't set.
	* lib/lto.exp (lto_init, lto_finish): Let each 'lto_init'
	determine the default 'LTO_OPTIONS'.
	* lib/torture-options.exp (torture-init, torture-finish): Let each
	'torture-init' determine the 'LTO_TORTURE_OPTIONS'.

gcc/testsuite/g++.dg/guality/guality.exp

@@ -37,6 +37,7 @@ proc check_guality {args} {
 }
 
 dg-init
+torture-init
 
 global GDB
 if ![info exists ::env(GUALITY_GDB_NAME)] {
@@ -54,7 +55,6 @@ report_gdb $::env(GUALITY_GDB_NAME) [info script]
 
 global DG_TORTURE_OPTIONS LTO_TORTURE_OPTIONS
 set guality_dg_torture_options [guality_minimal_options $DG_TORTURE_OPTIONS]
-torture-init
 set-torture-options \
     $guality_dg_torture_options \
     [list {}] \

gcc/testsuite/gcc.dg/guality/guality.exp

@@ -37,6 +37,7 @@ proc check_guality {args} {
 }
 
 dg-init
+torture-init
 
 global GDB
 if ![info exists ::env(GUALITY_GDB_NAME)] {
@@ -69,7 +70,6 @@ global DG_TORTURE_OPTIONS
 set guality_dg_torture_options [guality_minimal_options $DG_TORTURE_OPTIONS]
 set guality_dg_torture_options [guality_transform_options $guality_dg_torture_options]
 set guality_lto_torture_options [guality_transform_options $LTO_TORTURE_OPTIONS]
-torture-init
 set-torture-options \
     $guality_dg_torture_options \
     [list {}] \

gcc/testsuite/gfortran.dg/guality/guality.exp

@@ -18,6 +18,7 @@ if { [istarget "powerpc-ibm-aix*"] } {
 }
 
 dg-init
+torture-init
 
 global GDB
 if ![info exists ::env(GUALITY_GDB_NAME)] {
@@ -35,7 +36,6 @@ report_gdb $::env(GUALITY_GDB_NAME) [info script]
 
 global DG_TORTURE_OPTIONS
 set guality_dg_torture_options [guality_minimal_options $DG_TORTURE_OPTIONS]
-torture-init
 set-torture-options \
     $guality_dg_torture_options \
 

gcc/testsuite/lib/c-torture.exp

@@ -38,7 +38,6 @@ if { $orig_environment_saved == 0 } {
 # The default option list can be overridden by
 # TORTURE_OPTIONS="{ list1 } ... { listN }"
 
-set LTO_TORTURE_OPTIONS ""
 if [info exists TORTURE_OPTIONS] {
     set C_TORTURE_OPTIONS $TORTURE_OPTIONS
 } else {
@@ -57,22 +56,6 @@ if [info exists TORTURE_OPTIONS] {
 	{ -O3 -g } \
 	{ -Os } \
 	{ -Og -g } ]
-
-    if [check_effective_target_lto] {
-        # When having plugin test both slim and fat LTO and plugin/nonplugin
-        # path.
-        if [check_linker_plugin_available] {
-          set LTO_TORTURE_OPTIONS [list \
-    	      { -O2 -flto -fno-use-linker-plugin -flto-partition=none } \
-	      { -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects }
-          ]
-        } else {
-          set LTO_TORTURE_OPTIONS [list \
-	      { -O2 -flto -flto-partition=none } \
-	      { -O2 -flto }
-          ]
-        }
-    }
 }
 
 if [info exists ADDITIONAL_TORTURE_OPTIONS] {

gcc/testsuite/lib/gcc-dg.exp

@@ -73,7 +73,6 @@ if { $orig_environment_saved == 0 } {
 global gcc_force_conventional_output
 set gcc_force_conventional_output ""
 
-set LTO_TORTURE_OPTIONS ""
 if [info exists TORTURE_OPTIONS] {
     set DG_TORTURE_OPTIONS $TORTURE_OPTIONS
 } else {
@@ -93,19 +92,6 @@ if [info exists TORTURE_OPTIONS] {
 	{ -Os } ]
 
     if [check_effective_target_lto] {
-        # When having plugin test both slim and fat LTO and plugin/nonplugin
-        # path.
-	if [check_linker_plugin_available] {
-           set LTO_TORTURE_OPTIONS [list \
-	      { -O2 -flto -fno-use-linker-plugin -flto-partition=none } \
-	      { -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects }
-           ]
-        } else {
-           set LTO_TORTURE_OPTIONS [list \
-	      { -O2 -flto -flto-partition=none } \
-	      { -O2 -flto }
-           ]
-        }
         set gcc_force_conventional_output "-ffat-lto-objects"
     }
 }

gcc/testsuite/lib/lto.exp

@@ -215,6 +215,11 @@ proc lto_init { args } {
 	      {-O2 -flto}		\
 	  ]
 	}
+	global lto_init_set_LTO_OPTIONS
+	if [info exists lto_init_set_LTO_OPTIONS] {
+	    error "lto_init_set_LTO_OPTIONS already set"
+	}
+	set lto_init_set_LTO_OPTIONS 1
     }
 }
 
@@ -233,6 +238,14 @@ proc lto_finish { } {
     } elseif [board_info $dest exists mathlib] {
 	unset board_info($dest,mathlib)
     }
+
+    # Let the next 'lto_init' redetermine the default 'LTO_OPTIONS'.
+    global lto_init_set_LTO_OPTIONS
+    if [info exists lto_init_set_LTO_OPTIONS] {
+	global LTO_OPTIONS
+	unset LTO_OPTIONS
+	unset lto_init_set_LTO_OPTIONS
+    }
 }
 
 # Subsets of tests can be selectively disabled by members of this list:

gcc/testsuite/lib/torture-options.exp

@@ -28,6 +28,27 @@ proc torture-init { args } {
     if [info exists torture_with_loops] {
 	error "torture-init: torture_with_loops is not empty as expected"
     }
+
+    global LTO_TORTURE_OPTIONS
+    if [info exists LTO_TORTURE_OPTIONS] {
+	error "torture-init: LTO_TORTURE_OPTIONS is not empty as expected"
+    }
+    set LTO_TORTURE_OPTIONS ""
+    if [check_effective_target_lto] {
+	# When having plugin test both slim and fat LTO and plugin/nonplugin
+	# path.
+	if [check_linker_plugin_available] {
+	    set LTO_TORTURE_OPTIONS [list \
+	      { -O2 -flto -fno-use-linker-plugin -flto-partition=none } \
+	      { -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects }
+	    ]
+	} else {
+	    set LTO_TORTURE_OPTIONS [list \
+	      { -O2 -flto -flto-partition=none } \
+	      { -O2 -flto }
+	    ]
+	}
+    }
 }
 
 # Return 1 if torture options have already been set, 0 otherwise.
@@ -100,6 +121,13 @@ proc torture-finish { args } {
     } else {
 	error "torture-finish: torture_with_loops is not defined"
     }
+
+    global LTO_TORTURE_OPTIONS
+    if [info exists LTO_TORTURE_OPTIONS] {
+	unset LTO_TORTURE_OPTIONS
+    } else {
+	error "torture-finish: LTO_TORTURE_OPTIONS is not defined"
+    }
 }
 
 # Useful for debugging .exp files.