PR 46686 Implement backtrace with _Unwind_Backtrace from libgcc.

2011-11-09  Janne Blomqvist  <jb@gcc.gnu.org>

	PR fortran/46686
	* configure.ac: Don't check execinfo.h, backtrace,
	backtrace_symbols_fd. Check execve instead of execvp. Call
	GCC_CHECK_UNWIND_GETIPINFO.
	* runtime/backtrace.c: Don't include unused headers, include
	limits.h and unwind.h.
	(CAN_FORK): Check execve instead of execvp.
	(GLIBC_BACKTRACE): Remove.
	(bt_header): Conform to gdb backtrace format.
	(struct bt_state): New struct.
	(trace_function): New function.
	(show_backtrace): Use _Unwind_Backtrace from libgcc instead of
	glibc backtrace functions.
	* Makefile.in: Regenerated.
	* aclocal.m4: Regenerated.
	* config.h.in: Regenerated.
	* configure: Regenerated.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@181209 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 44 insertions, 19 deletions

diff --git a/libgfortran/configure b/libgfortran/configure
index 3a1174a1237..0ee67d5d1a7 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -766,6 +766,7 @@ with_gnu_ld
 enable_libtool_lock
 enable_largefile
 enable_libquadmath_support
+with_system_libunwind
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1424,6 +1425,7 @@ Optional Packages:
   --with-pic              try to use only PIC/non-PIC objects [default=use
                           both]
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-system-libunwind use installed libunwind
 
 Some influential environment variables:
   CC          C compiler command
@@ -12112,7 +12114,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12115 "configure"
+#line 12117 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12218,7 +12220,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12221 "configure"
+#line 12223 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -15919,7 +15921,7 @@ fi
 
 done
 
-for ac_header in fenv.h fptrap.h float.h execinfo.h pwd.h
+for ac_header in fenv.h fptrap.h float.h pwd.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
@@ -16419,7 +16421,7 @@ _ACEOF
 fi
 done
 
-for ac_func in wait setmode execvp pipe dup2 close fdopen strcasestr getrlimit
+for ac_func in wait setmode execve pipe dup2 close fdopen strcasestr getrlimit
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -16472,21 +16474,6 @@ fi
 done
 
 
-# Check for glibc backtrace functions
-for ac_func in backtrace backtrace_symbols_fd
-do :
-  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
-ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
-eval as_val=\$$as_ac_var
-   if test "x$as_val" = x""yes; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-done
-
-
 # Check libc for getgid, getpid, getuid
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getgid in -lc" >&5
 $as_echo_n "checking for getgid in -lc... " >&6; }
@@ -25880,6 +25867,44 @@ $as_echo "#define HAVE_CRLF 1" >>confdefs.h
 
 fi
 
+# Check whether we have _Unwind_GetIPInfo for backtrace
+
+
+# Check whether --with-system-libunwind was given.
+if test "${with_system_libunwind+set}" = set; then :
+  withval=$with_system_libunwind;
+fi
+
+  # If system-libunwind was not specifically set, pick a default setting.
+  if test x$with_system_libunwind = x; then
+    case ${target} in
+      ia64-*-hpux*) with_system_libunwind=yes ;;
+      *) with_system_libunwind=no ;;
+    esac
+  fi
+  # Based on system-libunwind and target, do we have ipinfo?
+  if  test x$with_system_libunwind = xyes; then
+    case ${target} in
+      ia64-*-*) have_unwind_getipinfo=no ;;
+      *) have_unwind_getipinfo=yes ;;
+    esac
+  else
+    # Darwin before version 9 does not have _Unwind_GetIPInfo.
+
+    case ${target} in
+      *-*-darwin[3-8]|*-*-darwin[3-8].*) have_unwind_getipinfo=no ;;
+      *) have_unwind_getipinfo=yes ;;
+    esac
+
+  fi
+
+  if test x$have_unwind_getipinfo = xyes; then
+
+$as_echo "#define HAVE_GETIPINFO 1" >>confdefs.h
+
+  fi
+
+
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure