gdb/

* symtab.c (compare_filenames_for_search): New comment for
	HAS_DRIVE_SPEC.

gdb/testsuite/
	* gdb.dwarf2/dw2-dos-drive.S: New file.
	* gdb.dwarf2/dw2-dos-drive.exp: New file.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2013-01-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* symtab.c (compare_filenames_for_search): New comment for
+	HAS_DRIVE_SPEC.
+
 2013-01-17  Tom Tromey  <tromey@redhat.com>
 
 	* cp-abi.c (cp_abi_completer): Fix typo in assignment.

gdb/symtab.c

@@ -164,7 +164,12 @@ compare_filenames_for_search (const char *filename, const char *search_name)
 
   /* Either the names must completely match, or the character
      preceding the trailing SEARCH_NAME segment of FILENAME must be a
-     directory separator.  */
+     directory separator.
+
+     The HAS_DRIVE_SPEC purpose is to make FILENAME "c:file.c"
+     compatible with SEARCH_NAME "file.c".  In such case a compiler had
+     to put the "c:file.c" name into debug info.  Such compatibility
+     works only on GDB built for DOS host.  */
   return (len == search_len
 	  || IS_DIR_SEPARATOR (filename[len - search_len - 1])
 	  || (HAS_DRIVE_SPEC (filename)

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2013-01-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* gdb.dwarf2/dw2-dos-drive.S: New file.
+	* gdb.dwarf2/dw2-dos-drive.exp: New file.
+
 2013-01-17  Doug Evans  <dje@google.com>
 
 	* boards/dwarf4-gdb-index.exp: Use any existing CC_FOR_TARGET,

gdb/testsuite/gdb.dwarf2/dw2-dos-drive.S

@@ -0,0 +1,75 @@
+/* Copyright 2013 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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+	.text
+pc_start:
+	.byte	0
+pc_end:
+
+	.section	.debug_info
+d:
+	.4byte	.Ldebug_info_end - 1f	/* Length of Compilation Unit Info */
+1:
+	.2byte	0x3	/* DWARF version number */
+	.4byte	.Ldebug_abbrev0	/* Offset Into Abbrev. Section */
+	.byte	0x4	/* Pointer Size (in bytes) */
+dieb:
+	.uleb128 0x1	/* (DIE (0xb) DW_TAG_compile_unit) */
+	.ascii	"GCC\0"	/* DW_AT_producer */
+	.byte	0x2	/* DW_AT_language = DW_LANG_C */
+	.ascii	"z:file.c\0"	/* DW_AT_name */
+
+	.uleb128 0x2		/* (DIE (0xd3) DW_TAG_subprogram) */
+	.byte	0x1		/* DW_AT_external */
+	.ascii	"func\0"	/* DW_AT_name */
+	.4byte	pc_start	/* DW_AT_low_pc */
+	.4byte	pc_end		/* DW_AT_high_pc */
+	.byte	0x1		/* DW_AT_prototyped */
+
+	.byte	0x0	/* end of children of DIE 0xb */
+.Ldebug_info_end:
+
+	.section	.debug_abbrev
+.Ldebug_abbrev0:
+
+	.uleb128 0x1	/* (abbrev code) */
+	.uleb128 0x11	/* (TAG: DW_TAG_compile_unit) */
+	.byte	0x1	/* DW_children_yes */
+	.uleb128 0x25	/* (DW_AT_producer) */
+	.uleb128 0x8	/* (DW_FORM_string) */
+	.uleb128 0x13	/* (DW_AT_language) */
+	.uleb128 0xb	/* (DW_FORM_data1) */
+	.uleb128 0x3	/* (DW_AT_name) */
+	.uleb128 0x8	/* (DW_FORM_string) */
+	.byte	0x0
+	.byte	0x0
+
+	.uleb128 0x2	/* (abbrev code) */
+	.uleb128 0x2e	/* (DW_TAG_subprogram) */
+	.byte	0x0	/* DW_children_no */
+	.uleb128 0x3f	/* (DW_AT_external) */
+	.uleb128 0xc	/* (DW_FORM_flag) */
+	.uleb128 0x3	/* (DW_AT_name) */
+	.uleb128 0x8	/* (DW_FORM_string) */
+	.uleb128 0x11	/* (DW_AT_low_pc) */
+	.uleb128 0x1	/* (DW_FORM_addr) */
+	.uleb128 0x12	/* (DW_AT_high_pc) */
+	.uleb128 0x1	/* (DW_FORM_addr) */
+	.uleb128 0x27	/* (DW_AT_prototyped) */
+	.uleb128 0xc	/* (DW_FORM_flag) */
+	.byte	0x0
+	.byte	0x0
+
+	.byte	0x0

gdb/testsuite/gdb.dwarf2/dw2-dos-drive.exp

@@ -0,0 +1,41 @@
+# Copyright 2013 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 3 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, see <http://www.gnu.org/licenses/>.
+load_lib dwarf.exp
+
+if {![dwarf2_support]} {
+    return 0  
+}
+
+standard_testfile .S
+set executable ${testfile}
+
+if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" object {}] != "" } {
+    return -1
+}
+
+clean_restart $executable
+
+gdb_test_no_output "set breakpoint pending off"
+
+gdb_test "break 'z:file.c':func" {Breakpoint [0-9]+ at .*}
+
+set dos [expr [istarget "*-*-cygwin*"] || [istarget "i?86-*-mingw*"] \
+	      || [istarget "*-*-msdosdjgpp*"] || [istarget "*-*-go32*"] ]
+
+if { $dos } {
+    gdb_test "break file.c:func" {Breakpoint [0-9]+ at .*}
+} else {
+    unsupported "break file.c:func"
+}