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Add no-FPU ColdFire math_private.h [committed]
- From: Joseph Myers <joseph at codesourcery dot com>
- To: <libc-alpha at sourceware dot org>
- Date: Wed, 24 Jan 2018 23:34:16 +0000
- Subject: Add no-FPU ColdFire math_private.h [committed]
- Authentication-results: sourceware.org; auth=none
As with some other soft-float configurations, no-FPU ColdFire needs
various fenv.h functions and glibc-internal macros overridden in
math_private.h to avoid references to undefined FE_* macros when
building glibc. This patch adds a suitable math_private.h, based on
the MicroBlaze one (Nios II and Tile also have similar files).
There's a case for having such a file in sysdeps/ieee754/soft-fp so
this logic is applied more generally to configurations without
exceptions and rounding modes, even when the relevant macros are
defined in fenv.h - the only case where that might be inappropriate is
ARM soft-float (where the fenv.h functions might or might not work at
runtime, depending on whether the processor used at runtime supports
VFP). There's also a case that soft-float configurations (on
processors with both hard-float and soft-float) should more
consistently avoid defining FE_* macros in bits/fenv.h when not
actually supported. But both of those are separate potential
cleanups.
This allows the no-FPU ColdFire build to get further (another fix is
needed to allow the build to complete).
Committed.
2018-01-24 Joseph Myers <joseph@codesourcery.com>
* sysdeps/m68k/coldfire/nofpu/math_private.h: New file. Based on
MicroBlaze file.
diff --git a/sysdeps/m68k/coldfire/nofpu/math_private.h b/sysdeps/m68k/coldfire/nofpu/math_private.h
new file mode 100644
index 0000000..879577b
--- /dev/null
+++ b/sysdeps/m68k/coldfire/nofpu/math_private.h
@@ -0,0 +1,52 @@
+/* Disable use of exceptions and rounding modes for no-FPU ColdFire.
+ Copyright (C) 2012-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef COLDFIRE_NOFPU_MATH_PRIVATE_H
+#define COLDFIRE_NOFPU_MATH_PRIVATE_H 1
+
+/* Suppress use of exceptions and rounding modes here to avoid build
+ errors if the FE_* macros aren't defined.
+
+ We intentionally ignore the "exception" arguments of functions that
+ take an exception, since we can't even evaluate the argument
+ without causing a build failure. The extra level of statement
+ expression wrapping avoids "statement with no effect" warnings.
+ Since the callers don't check for errors anyway, we just claim
+ success in every case.
+
+ The overrides for libc_ functions must happen before we include
+ the generic math_private.h, and the overrides for regular
+ <fenv.h> functions must happen afterwards, to avoid clashing with
+ the declarations of those functions. */
+
+#define libc_fesetround(rnd) ({ 0; })
+#define libc_fetestexcept(exc) ({ 0; })
+#define libc_feholdexcept_setround(env, exc) ({ (void) (env); 0; })
+#define libc_feupdateenv_test(env, exc) ({ (void) (env); 0; })
+
+/* Enable __finitel, __isinfl, and __isnanl for binary compatibility
+ when built without long double support. */
+#define LDBL_CLASSIFY_COMPAT 1
+
+#include_next <math_private.h>
+
+#define feraiseexcept(excepts) ({ 0; })
+#define __feraiseexcept(excepts) ({ 0; })
+#define feclearexcept(exc) ({ 0; })
+
+#endif
--
Joseph S. Myers
joseph@codesourcery.com