Add the -fdebug-aux-vars flag to debug variables generated by Fortran.

gcc/fortran/ChangeLog:

	PR fortran/90207
	* invoke.texi: Document -fdebug-aux-vars.
	* lang.opt: Add -fdebug-aux-vars.
	* trans.c (MAX_PREFIX_LEN): New macro.
	(create_var_debug_raw): New function.
	(gfc_create_var_np): Call create_var_debug_raw if
	flag_debug_aux_vars is set.

1 files changed, 10 insertions, 1 deletions

diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi
index 8bdc8a6..069ccd3 100644
--- a/gcc/fortran/invoke.texi
+++ b/gcc/fortran/invoke.texi
@@ -160,7 +160,7 @@ and warnings}.
 @item Debugging Options
 @xref{Debugging Options,,Options for debugging your program or GNU Fortran}.
 @gccoptlist{-fbacktrace -fdump-fortran-optimized -fdump-fortran-original @gol
--fdump-fortran-global -fdump-parse-tree -ffpe-trap=@var{list} @gol
+-fdebug-aux-vars -fdump-fortran-global -fdump-parse-tree -ffpe-trap=@var{list} @gol
 -ffpe-summary=@var{list}
 }
 
@@ -1219,6 +1219,15 @@ change between releases. This option may also generate internal
 compiler errors for features which have only recently been added. This
 option is deprecated; use @code{-fdump-fortran-original} instead.
 
+@item -fdebug-aux-vars
+@opindex @code{fdebug-aux-vars}
+Renames internal variables created by the gfortran front end and makes
+them accessible to a debugger.  The name of the internal variables then
+start with upper-case letters followed by an underscore.  This option is
+useful for debugging the compiler's code generation together with
+@code{-fdump-tree-original} and enabling debugging of the executable
+program by using @code{-g} or @code{-ggdb3}.
+
 @item -fdump-fortran-global
 @opindex @code{fdump-fortran-global}
 Output a list of the global identifiers after translating into