add --enable-default-compressed-debug-sections-algorithm configure option

ChangeLog:

	* configure.ac: Add --enable-default-compressed-debug-sections-algorithm.
	* configure: Regenerate.

configure

@@ -807,6 +807,7 @@ enable_offload_defaulted
 enable_gold
 enable_ld
 enable_compressed_debug_sections
+enable_default_compressed_debug_sections_algorithm
 enable_libquadmath
 enable_libquadmath_support
 enable_libada
@@ -1546,6 +1547,9 @@ Optional Features:
   --enable-compressed-debug-sections={all,gas,gold,ld,none}
                           Enable compressed debug sections for gas, gold or ld
                           by default
+  --enable-default-compressed-debug-sections-algorithm={zlib,zstd}
+                          Default compression algorithm for
+                          --enable-compressed-debug-sections.
   --disable-libquadmath   do not build libquadmath directory
   --disable-libquadmath-support
                           disable libquadmath support for Fortran
@@ -3142,6 +3146,15 @@ else
 fi
+# Select default compression algorithm.
+# Check whether --enable-default_compressed_debug_sections_algorithm was given.
+if test "${enable_default_compressed_debug_sections_algorithm+set}" = set; then :
+  enableval=$enable_default_compressed_debug_sections_algorithm;
+else
+  default_compressed_debug_sections_algorithm=
+fi
+
+
 # Configure extra directories which are host specific
 case "${host}" in

configure.ac

@@ -418,6 +418,12 @@ AC_ARG_ENABLE(compressed_debug_sections,
   fi
 ], [enable_compressed_debug_sections=])
 
+# Select default compression algorithm.
+AC_ARG_ENABLE(default_compressed_debug_sections_algorithm,
+[AS_HELP_STRING([--enable-default-compressed-debug-sections-algorithm={zlib,zstd}],
+		[Default compression algorithm for --enable-compressed-debug-sections.])],
+[], [default_compressed_debug_sections_algorithm=])
+
 # Configure extra directories which are host specific
 
 case "${host}" in