Reset x86 Linux targets to not compressing debug sections by default. Enable compression of debug sections by default in the linker, if so configured.

	PR gas/19109
.	* configure.ac: Note the 'none' is an acceptable argument to
	--enable-compressed-debug-sections.
	* configure: Regenerate.

gas	* configure.ac: Restore --enable-compressed-debug-sections.
	Do not enable compressed debug sections by default for x86 Linux
	targets.
	* configure: Regenerate.

ld	* configure.ac: Add --enable-compressed-debug-sections.
	* configure: Regenerate.
	* config.in: Regenerate.
	* ld.texinfo: Document how to determine the default action for
	debug sections.
	* ldmain.c (main): If DEFAULT_FLAG_COMPRESS_DEBUG is defined then
	set the compress_debug field of the link_info structure to
	zlib-gabi.
	* lexsup.c (elf_static_list_options): Output the default setting
	for the --compress-debug-sections option.
	* NEWS: Mention the new configure option.

3 files changed, 42 insertions, 16 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index e6f9c1f..6bc2213 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,11 @@
+2015-10-21  Nick Clifton  <nickc@redhat.com>
+
+	PR gas/19109
+	* configure.ac: Restore --enable-compressed-debug-sections.
+	Do not enable compressed debug sections by default for x86 Linux
+	targets.
+	* configure: Regenerate.
+
 2015-10-20  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR gas/19109
diff --git a/gas/configure b/gas/configure
index 397bb38..e7c6fad 100755
--- a/gas/configure
+++ b/gas/configure
@@ -764,6 +764,7 @@ enable_plugins
 enable_largefile
 enable_targets
 enable_checking
+enable_compressed_debug_sections
 enable_werror
 enable_build_warnings
 enable_nls
@@ -1412,6 +1413,7 @@ Optional Features:
   --disable-largefile     omit support for large files
   --enable-targets        alternative target configurations besides the primary
   --enable-checking       enable run-time checks
+  --enable-compressed-debug-sections  compress debug sections by default
   --enable-werror         treat compile warnings as errors
   --enable-build-warnings enable build-time compiler warnings
   --disable-nls           do not use Native Language Support
@@ -10969,7 +10971,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10972 "configure"
+#line 10974 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11075,7 +11077,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11078 "configure"
+#line 11080 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11664,6 +11666,19 @@ $as_echo "#define ENABLE_CHECKING 1" >>confdefs.h
 
 fi
 
+# PR gas/19109
+# Decide the default method for compressing debug sections.
+ac_default_compressed_debug_sections=unset
+# Provide a configure time option to override our default.
+# Check whether --enable-compressed_debug_sections was given.
+if test "${enable_compressed_debug_sections+set}" = set; then :
+  enableval=$enable_compressed_debug_sections; case "${enableval}" in
+  yes | all | gas) ac_default_compressed_debug_sections=yes ;;
+  no | none)  ac_default_compressed_debug_sections=no ;;
+  *)   ac_default_compressed_debug_sections=unset ;;
+esac
+fi
+
 using_cgen=no
 
 
@@ -12489,15 +12504,11 @@ _ACEOF
 
 done
 
-# For x86 Linux targets, default to compressing debug sections unless
-# configured otherwise.
-case x${enable_compressed_debug_sections}-${target_cpu_type}-${target_os} in
-x*gas*|xall*|x-i386-linux-gnu)
+if test x$ac_default_compressed_debug_sections == xyes ; then
 
 $as_echo "#define DEFAULT_FLAG_COMPRESS_DEBUG 1" >>confdefs.h
 
-  ;;
-esac
+fi
 
 # Turn on all targets if possible
 if test ${all_targets} = "yes"; then
diff --git a/gas/configure.ac b/gas/configure.ac
index b15da9a..278a7fb 100644
--- a/gas/configure.ac
+++ b/gas/configure.ac
@@ -64,6 +64,18 @@ if test x$ac_checking != x ; then
   AC_DEFINE(ENABLE_CHECKING, 1, [Define if you want run-time sanity checks.])
 fi
 
+# PR gas/19109
+# Decide the default method for compressing debug sections.
+ac_default_compressed_debug_sections=unset
+# Provide a configure time option to override our default.
+AC_ARG_ENABLE(compressed_debug_sections,
+[  --enable-compressed-debug-sections  compress debug sections by default],
+[case "${enableval}" in
+  yes | all | gas) ac_default_compressed_debug_sections=yes ;;
+  no | none)  ac_default_compressed_debug_sections=no ;;
+  *)   ac_default_compressed_debug_sections=unset ;;
+esac])dnl
+
 using_cgen=no
 
 AM_BINUTILS_WARNINGS
@@ -536,14 +548,9 @@ changequote([,])dnl
 
 done
 
-# For x86 Linux targets, default to compressing debug sections unless
-# configured otherwise.
-case x${enable_compressed_debug_sections}-${target_cpu_type}-${target_os} in
-x*gas*|xall*|x-i386-linux-gnu)
-  AC_DEFINE(DEFAULT_FLAG_COMPRESS_DEBUG, 1,
-	    [Define if you want compressed debug sections by default.])
-  ;;
-esac
+if test x$ac_default_compressed_debug_sections == xyes ; then
+  AC_DEFINE(DEFAULT_FLAG_COMPRESS_DEBUG, 1, [Define if you want compressed debug sections by default.])
+fi
 
 # Turn on all targets if possible
 if test ${all_targets} = "yes"; then