Use require is_c_compiler_gcc

This changes some tests to use "require is_c_compiler_gcc".

gdb/testsuite/gdb.base/morestack.exp

@@ -13,10 +13,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-if {![is_c_compiler_gcc]} {
-    unsupported "gcc compiler is required"
-    return
-}
+require is_c_compiler_gcc
 
 standard_testfile
 

gdb/testsuite/gdb.base/prelink.exp

@@ -19,16 +19,11 @@
 # This file was written by Alexandre Oliva <aoliva@redhat.com>
 
 
-require isnative !skip_shlib_tests
+require isnative !skip_shlib_tests is_c_compiler_gcc
 if { [is_remote host] } {
     return
 }
 
-if {![is_c_compiler_gcc]} {
-    unsupported "gcc compiler is required"
-    return -1
-}
-
 load_lib prelink-support.exp
 
 set testfile "prelink"

gdb/testsuite/gdb.dwarf2/dw2-disasm-over-non-stmt.exp

@@ -28,9 +28,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 # Reuse many of the test source files from dw2-inline-header-1.exp.
 standard_testfile dw2-inline-header-lbls.c dw2-inline-header.S \

gdb/testsuite/gdb.dwarf2/dw2-inline-header-1.exp

@@ -56,9 +56,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 # Prepare and run the test.
 proc do_test { start_label func_name tag } {

gdb/testsuite/gdb.dwarf2/dw2-inline-header-2.exp

@@ -51,9 +51,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile dw2-inline-header-lbls.c dw2-inline-header.S \
     dw2-inline-header.c dw2-inline-header.h

gdb/testsuite/gdb.dwarf2/dw2-inline-header-3.exp

@@ -40,9 +40,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile dw2-inline-header-lbls.c dw2-inline-header.S \
     dw2-inline-header.c dw2-inline-header.h

gdb/testsuite/gdb.dwarf2/dw2-inline-many-frames.exp

@@ -29,9 +29,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c .S
 

gdb/testsuite/gdb.dwarf2/dw2-inline-small-func.exp

@@ -30,9 +30,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile -lbls.c .S \
     .c .h

gdb/testsuite/gdb.dwarf2/dw2-inline-stepping.exp

@@ -29,9 +29,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c .S
 

gdb/testsuite/gdb.dwarf2/dw2-is-stmt-2.exp

@@ -29,9 +29,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c .S
 

gdb/testsuite/gdb.dwarf2/dw2-is-stmt.exp

@@ -29,9 +29,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c .S
 

gdb/testsuite/gdb.dwarf2/dw2-line-number-zero.exp

@@ -18,10 +18,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-main-no-line-number.exp

@@ -22,10 +22,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile main.c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-out-of-range-end-of-seq.exp

@@ -22,10 +22,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile main.c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-ranges-base.exp

@@ -21,10 +21,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-ranges-func.exp

@@ -19,10 +19,7 @@ load_lib dwarf.exp
 # This test can only be run on targets which support DWARF-2 and use gas.
 require dwarf2_support
 
-if ![is_c_compiler_gcc] {
-    unsupported "gcc required for this test"
-    return 0
-}
+require is_c_compiler_gcc
 
 proc do_test {suffix} {
     global gdb_test_file_name

gdb/testsuite/gdb.dwarf2/dw2-ranges-overlap.exp

@@ -25,10 +25,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-ranges-psym.exp

@@ -20,10 +20,7 @@ load_lib dwarf.exp
 # This test can only be run on targets which support DWARF-2 and use gas.
 require dwarf2_support
 
-if ![is_c_compiler_gcc] {
-    unsupported "gcc required for this test"
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile main.c .c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-ranges.exp

@@ -21,10 +21,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0  
-}
+require is_c_compiler_gcc
 
 standard_testfile .c -2.c -3.c
 set asmfile [standard_output_file ${testfile}.s]

gdb/testsuite/gdb.dwarf2/dw2-step-out-of-function-no-stmt.exp

@@ -31,10 +31,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c -dw.S
 

gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.exp

@@ -18,10 +18,7 @@ load_lib dwarf.exp
 require dwarf2_support
 
 # The .c files use __attribute__.
-if ![is_c_compiler_gcc] {
-    verbose "Skipping $gdb_test_file_name."
-    return 0
-}
+require is_c_compiler_gcc
 
 standard_testfile .c -dw.S