Don't compress empty debug sections.

gas/

2011-01-18  H.J. Lu  <hongjiu.lu@intel.com>

	PR gas/12409
	* write.c (compress_debug): Return if section size is 0.

gas/testsuite/

2011-01-18  H.J. Lu  <hongjiu.lu@intel.com>

	PR gas/12409
	* gas/elf/dwarf2-4.d: New.
	* gas/elf/dwarf2-4.s: Likewise.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 30d7609..bb47e72 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2011-01-18  H.J. Lu  <hongjiu.lu@intel.com>
+
+       PR gas/12409
+       * write.c (compress_debug): Return if section size is 0.
+
 2011-01-18  Mingfeng Wu  <mingfeng@faraday-tech.com>
 
        * config/tc-arm.c (arm_cpus): Add Faraday ARMv5TE compatible

diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog
index 26a1add..2fc1b36 100644 (file)
--- a/gas/testsuite/ChangeLog
+++ b/gas/testsuite/ChangeLog
@@ -1,5 +1,13 @@
 2011-01-18  H.J. Lu  <hongjiu.lu@intel.com>
 
+       PR gas/12409
+       * gas/elf/dwarf2-4.d: New.
+       * gas/elf/dwarf2-4.s: Likewise.
+
+       * gas/elf/elf.exp: Run dwarf2-4.
+
+2011-01-18  H.J. Lu  <hongjiu.lu@intel.com>
+
        * gas/i386/intel.d: Updated.
        * gas/i386/opcode-intel.d: Likewise.
        * gas/i386/opcode-suffix.d: Likewise.

diff --git a/gas/testsuite/gas/elf/dwarf2-4.d b/gas/testsuite/gas/elf/dwarf2-4.d
new file mode 100644 (file)
index 0000000..39e0326
--- /dev/null
+++ b/gas/testsuite/gas/elf/dwarf2-4.d
@@ -0,0 +1,12 @@
+#as:  --compress-debug-sections
+#readelf: -w
+#name: DWARF2 4
+#not-target: ia64-*-*
+
+Contents of the .[z]?debug_abbrev section:
+
+
+
+Section '.debug_info' has no debugging data.
+
+Section '.debug_line' has no debugging data.

diff --git a/gas/testsuite/gas/elf/dwarf2-4.s b/gas/testsuite/gas/elf/dwarf2-4.s
new file mode 100644 (file)
index 0000000..eeb4ace
--- /dev/null
+++ b/gas/testsuite/gas/elf/dwarf2-4.s
@@ -0,0 +1,12 @@
+       .file   "__dn_comp.c"
+       .section        .debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+       .section        .debug_info,"",@progbits
+.Ldebug_info0:
+       .section        .debug_line,"",@progbits
+.Ldebug_line0:
+       .text
+.Ltext0:
+.Letext0:
+       .section        .debug_abbrev
+       .byte   0x0

diff --git a/gas/testsuite/gas/elf/elf.exp b/gas/testsuite/gas/elf/elf.exp
index 7f86266..3828151 100644 (file)
--- a/gas/testsuite/gas/elf/elf.exp
+++ b/gas/testsuite/gas/elf/elf.exp
@@ -178,5 +178,6 @@ if { ([istarget "*-*-*elf*"]
     run_dump_test "dwarf2-1"
     run_dump_test "dwarf2-2"
     run_dump_test "dwarf2-3"
+    run_dump_test "dwarf2-4"
     run_dump_test "bad-section-flag"
 }

diff --git a/gas/write.c b/gas/write.c
index 018800e..aabb96d 100644 (file)
--- a/gas/write.c
+++ b/gas/write.c
@@ -1359,6 +1359,7 @@ compress_debug (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
   flagword flags = bfd_get_section_flags (abfd, sec);
 
   if (seginfo == NULL
+      || sec->size == 0
       || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
     return;