* configure.in (debugflags): check if -ggdb is accepted.

[ruby-core:42875][Bug #6080]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34840 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Feb 28 11:44:49 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (debugflags): check if -ggdb is accepted.
+	  [ruby-core:42875][Bug #6080]
+
 Tue Feb 28 10:28:51 2012  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych.rb: default open YAML files with utf8 external

configure.in

@@ -289,12 +289,10 @@ AC_SUBST(GCC)
 if test "$GCC" = yes; then
     linker_flag=-Wl,
     : ${optflags=-O3}
-    AS_CASE(["$target_os"], [linux*|darwin*], [: ${debugflags=-ggdb}])
     RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/config.h" "-include ruby/missing.h"])
 else
     linker_flag=
 fi
-test $ac_cv_prog_cc_g = yes && : ${debugflags=-g}
 
 RUBY_PROG_GNU_LD
 RUBY_CPPOUTFILE
@@ -490,6 +488,9 @@ if test "$GCC:${warnflags+set}:no" = yes::no; then
     warnflags=
 fi
 if test "$GCC" = yes; then
+    test "${debugflags+set}" || {RUBY_TRY_CFLAGS(-ggdb, [debugflags=-ggdb])}
+    test "${debugflags+set}" || {RUBY_TRY_CFLAGS(-g3, [debugflags=-g3])}
+
     # -D_FORTIFY_SOURCE
     RUBY_TRY_CFLAGS(-D_FORTIFY_SOURCE=2, [RUBY_APPEND_OPTION(XCFLAGS, -D_FORTIFY_SOURCE=2)])
 
@@ -513,6 +514,7 @@ if test "$GCC" = yes; then
     # suppress annoying -Wstrict-overflow warnings
     RUBY_TRY_CFLAGS(-fno-strict-overflow, [RUBY_APPEND_OPTION(XCFLAGS, -fno-strict-overflow)])
 fi
+test $ac_cv_prog_cc_g = yes && : ${debugflags=-g}
 
 if test "$GCC" = ""; then
     AS_CASE(["$target_os"],[aix*],[warnflags="-qinfo=por"])