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Use -cpp= for Fortran -cpp option passed to f951

I think my option handling patch series is now quite close to being
able to make the driver share the option processing machinery of the
core compilers.

There are of course options accepted by the driver but not the core
compilers, or by the core compilers but not the driver.  This is not
in itself a problem - the machinery already handles options known to
one front end but not another, and this is a similar case.  Indeed,
almost all options for any of the core compilers should be accepted by
the driver (and passed down via specs), while if a driver-only option
is passed to cc1 it seems quite appropriate to warn or error that it
is driver-only, like the existing warnings for other-front-end

More of a problem, however, is options that are incompatible between
the driver and the core compilers regarding whether they take
arguments; adding support for such variations in option semantics
seems like an undesirable complication, given that the interface to
the core compilers is a purely internal matter that we can change for
implementation convenience.

Thus, I have reviewed all 71 options files for options with such
incompatibilities.  Several oddities have come to light that are clear
bugs that I will fix in due course, plus two clear incompatibilities
that need addressing before the option-processing machinery can be

* The Fortran -cpp option takes no argument as an option to the
  driver, but takes an argument as an option to f951.

* common.opt unconditionally supports the -G option (-Gn and -G n,
  small data size).  This option is passed down by specs on some but
  not all targets, and SWITCH_TAKES_ARG controls whether the driver
  thinks -G has an argument on a given target.  On some targets not
  passing it to cc1, there is instead a -G option with no argument
  that specs pass to the *linker*, which is of course incompatible
  with the driver knowing about the -G option from common.opt on such

This patch fixes the first of these issues, by changing the internal
-cpp option to -cpp= taking a joined argument.  As a side-effect, the
Negative markers on -cpp (public option to the driver, no argument)
and -nocpp will now be effective (prune_options ignores all options
marked Joined, so the Negative markers would not previously have done

Bootstrapped with no regressions on x86_64-unknown-linux-gnu.  OK to

2010-07-28  Joseph Myers  <>

	* lang.opt (cpp): Remove Joined and Separate markers.
	(cpp=): New internal option.
	* lang-specs.h (F951_CPP_OPTIONS): Generate -cpp= option.
	* cpp.c (gfc_cpp_handle_option): Handle OPT_cpp_ instead of

Index: gcc/fortran/cpp.c
--- gcc/fortran/cpp.c	(revision 162620)
+++ gcc/fortran/cpp.c	(working copy)
@@ -354,7 +354,7 @@ gfc_cpp_handle_option (size_t scode, con
       result = 0;
-    case OPT_cpp:
+    case OPT_cpp_:
       gfc_cpp_option.temporary_filename = arg;
Index: gcc/fortran/lang.opt
--- gcc/fortran/lang.opt	(revision 162620)
+++ gcc/fortran/lang.opt	(working copy)
@@ -173,9 +173,13 @@ Fortran Warning
 Warn about unused dummy arguments.
-Fortran Joined Separate Negative(nocpp)
+Fortran Negative(nocpp)
 Enable preprocessing
+Fortran Joined Negative(nocpp) Undocumented
+; Internal option generated by specs from -cpp.
 Fortran Negative(cpp)
 Disable preprocessing
Index: gcc/fortran/lang-specs.h
--- gcc/fortran/lang-specs.h	(revision 162620)
+++ gcc/fortran/lang-specs.h	(working copy)
@@ -1,6 +1,6 @@
 /* Contribution to the specs for the GNU Compiler Collection
    from GNU Fortran 95 compiler.
-   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010
    Free Software Foundation, Inc.
    This file is free software; you can redistribute it and/or modify
@@ -30,7 +30,7 @@
 /* Options that f951 should know about, even if not preprocessing.  */
 #define CPP_FORWARD_OPTIONS "%{i*} %{I*} %{M*}"
-#define F951_CPP_OPTIONS    "%{!nocpp: -cpp %g.f90 %{E} %(cpp_unique_options) \
+#define F951_CPP_OPTIONS    "%{!nocpp: -cpp=%g.f90 %{E} %(cpp_unique_options) \
 			     %{E|M|MM:%(cpp_debug_options) " CPP_ONLY_OPTIONS \
 			     " -fsyntax-only};: " CPP_FORWARD_OPTIONS "}"
 #define F951_OPTIONS        "%(cc1_options) %{J*} \

Joseph S. Myers

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