gfortran.h: Add bitmasks for different FPE traps.

	* gfortran.h: Add bitmasks for different FPE traps. Add fpe
	member to options_t.
	* invoke.texi: Document the new -ffpe-trap option.
	* lang.opt: Add -ffpe-trap option.
	* options.c (gfc_init_options): Initialize the FPE option.
	(gfc_handle_fpe_trap_option): New function to parse the argument
	of the -ffpe-trap option.
	(gfc_handle_option): Add case for -ffpe-trap.
	* trans-decl.c: Declare a tree for the set_fpe library function.
	(gfc_build_builtin_function_decls): Build this tree.
	(gfc_generate_function_code): Generate a call to set_fpe at
	the beginning of the main program.
	* trans.h: New tree for the set_fpe library function.

	* Makefile.am: Add fpu.c to the build process, and
	target-dependent code as fpu-target.h.
	* Makefile.in: Regenerate.
	* configure.ac: Add call to configure.host to set
	FPU_HOST_HEADER.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure.host: New script to determine which host-dependent
	code should go in.
	* libgfortran.h: Add fpe option, remove previous fpu_ options.
	Add bitmasks for different FPE traps. Add prototype for set_fpu.
	* runtime/environ.c: Remove environment variables to control
	fpu behaviour.
	* runtime/fpu.c (set_fpe): New function for the front-end.
	* runtime/main.c (init): Set FPU state.
	* config: New directory to store host-dependent code.
	* config/fpu-387.h: New file with code handling the i387 FPU.
	* config/fpu-glibc.h: New file with code for glibc systems.
	* config/fpu-generic.h: Fallback for the most generic host. Issue
	warnings.

From-SVN: r105328

1 files changed, 21 insertions, 0 deletions

diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index 3f656dd..70e8e82 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -85,6 +85,7 @@ tree gfor_fndecl_stop_numeric;
 tree gfor_fndecl_stop_string;
 tree gfor_fndecl_select_string;
 tree gfor_fndecl_runtime_error;
+tree gfor_fndecl_set_fpe;
 tree gfor_fndecl_set_std;
 tree gfor_fndecl_in_pack;
 tree gfor_fndecl_in_unpack;
@@ -1934,6 +1935,7 @@ gfc_build_intrinsic_function_decls (void)
 void
 gfc_build_builtin_function_decls (void)
 {
+  tree gfc_c_int_type_node = gfc_get_int_type (gfc_c_int_kind);
   tree gfc_int4_type_node = gfc_get_int_type (4);
   tree gfc_int8_type_node = gfc_get_int_type (8);
   tree gfc_logical4_type_node = gfc_get_logical_type (4);
@@ -2018,6 +2020,10 @@ gfc_build_builtin_function_decls (void)
   /* The runtime_error function does not return.  */
   TREE_THIS_VOLATILE (gfor_fndecl_runtime_error) = 1;
 
+  gfor_fndecl_set_fpe =
+    gfc_build_library_function_decl (get_identifier (PREFIX("set_fpe")),
+				    void_type_node, 1, gfc_c_int_type_node);
+
   gfor_fndecl_set_std =
     gfc_build_library_function_decl (get_identifier (PREFIX("set_std")),
 				    void_type_node,
@@ -2455,6 +2461,21 @@ gfc_generate_function_code (gfc_namespace * ns)
       gfc_add_expr_to_block (&body, tmp);
     }
 
+  /* If this is the main program and a -ffpe-trap option was provided,
+     add a call to set_fpe so that the library will raise a FPE when
+     needed.  */
+  if (sym->attr.is_main_program && gfc_option.fpe != 0)
+    {
+      tree arglist, gfc_c_int_type_node;
+
+      gfc_c_int_type_node = gfc_get_int_type (gfc_c_int_kind);
+      arglist = gfc_chainon_list (NULL_TREE,
+				  build_int_cst (gfc_c_int_type_node,
+						 gfc_option.fpe));
+      tmp = gfc_build_function_call (gfor_fndecl_set_fpe, arglist);
+      gfc_add_expr_to_block (&body, tmp);
+    }
+
   if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node
       && sym->attr.subroutine)
     {