Remove --with-fp / --without-fp.

There is a configure option --without-fp that specifies that nofpu
sysdeps directories should be used instead of fpu directories.

For most glibc configurations, this option is of no use: either there
is no valid nofpu variant of that configuration, or there are no fpu
or nofpu sysdeps directories for that processor and so the option does
nothing.  For a few configurations, if you are using a soft-float
compiler this option is required, and failing to use it generally
results in compilation errors from inline asm using unavailable
floating-point instructions.

We're moving away from --with-cpu to configuring glibc based on how
the compiler generates code, and it is natural to do so for
--without-fp as well; in most cases the soft-float and hard-float ABIs
are incompatible so you have no hope of building a working glibc with
an inappropriately configured compiler or libgcc.

This patch eliminates --without-fp, replacing it entirely by automatic
configuration based on the compiler.  Configurations for which this is
relevant (coldfire / mips / powerpc32 / sh) define a variable
with_fp_cond in their preconfigure fragments (under the same
conditions under which those fragments do anything); this is a
preprocessor conditional which the toplevel configure script then uses
in a test to determine which sysdeps directories to use.

The config.make with-fp variable remains.  It's used only by powerpc
(sysdeps/powerpc/powerpc32/Makefile) to add -mhard-float to various
flags variables.  For powerpc, -mcpu= options can imply use of
soft-float.  That could be an issue if you want to build for
e.g. 476fp, but are using --with-cpu=476 because there isn't a 476fp
sysdeps directory.  If in future we eliminate --with-cpu and replace
it entirely by testing the compiler, it would be natural at that point
to eliminate that code as well (as the user should then just use a
compiler defaulting to 476fp and the 476 sysdeps directory would be
used automatically).

Tested for x86_64, and tested with build-many-glibcs.py that installed
shared libraries are unchanged by this patch.

	* configure.ac (--with-fp): Remove configure option.
	(with_fp_cond): New variable.
	(libc_cv_with_fp): New configure test.  Use this variable instead
	of with_fp.
	* configure: Regenerated.
	* config.make.in (with-fp): Use @libc_cv_with_fp@.
	* manual/install.texi (Configuring and compiling): Remove
	--without-fp.
	* INSTALL: Regenerated.
	* sysdeps/m68k/preconfigure (with_fp_cond): Define for ColdFire.
	* sysdeps/mips/preconfigure (with_fp_cond): Define.
	* sysdeps/powerpc/preconfigure (with_fp_cond): Define for 32-bit.
	* sysdeps/sh/preconfigure (with_fp_cond): Define.
	* scripts/build-many-glibcs.py (Context.add_all_configs): Do not
	use --without-fp to configure glibc.

1 files changed, 17 insertions, 34 deletions

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 59972a0..599e12e 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -216,15 +216,12 @@ class Context(object):
                         os_name='linux-gnu',
                         variant='soft',
                         gcc_cfg=['--with-mips-plt', '--with-float=soft'],
-                        glibcs=[{'variant': 'n32-soft',
-                                 'cfg': ['--without-fp']},
+                        glibcs=[{'variant': 'n32-soft'},
                                 {'variant': 'soft',
                                  'arch': 'mips',
-                                 'ccopts': '-mabi=32',
-                                 'cfg': ['--without-fp']},
+                                 'ccopts': '-mabi=32'},
                                 {'variant': 'n64-soft',
-                                 'ccopts': '-mabi=64',
-                                 'cfg': ['--without-fp']}])
+                                 'ccopts': '-mabi=64'}])
         self.add_config(arch='mips64',
                         os_name='linux-gnu',
                         variant='nan2008',
@@ -244,15 +241,12 @@ class Context(object):
                                  '--with-arch-64=mips64r2',
                                  '--with-arch-32=mips32r2',
                                  '--with-float=soft'],
-                        glibcs=[{'variant': 'n32-nan2008-soft',
-                                 'cfg': ['--without-fp']},
+                        glibcs=[{'variant': 'n32-nan2008-soft'},
                                 {'variant': 'nan2008-soft',
                                  'arch': 'mips',
-                                 'ccopts': '-mabi=32',
-                                 'cfg': ['--without-fp']},
+                                 'ccopts': '-mabi=32'},
                                 {'variant': 'n64-nan2008-soft',
-                                 'ccopts': '-mabi=64',
-                                 'cfg': ['--without-fp']}])
+                                 'ccopts': '-mabi=64'}])
         self.add_config(arch='mips64el',
                         os_name='linux-gnu',
                         gcc_cfg=['--with-mips-plt'],
@@ -265,15 +259,12 @@ class Context(object):
                         os_name='linux-gnu',
                         variant='soft',
                         gcc_cfg=['--with-mips-plt', '--with-float=soft'],
-                        glibcs=[{'variant': 'n32-soft',
-                                 'cfg': ['--without-fp']},
+                        glibcs=[{'variant': 'n32-soft'},
                                 {'variant': 'soft',
                                  'arch': 'mipsel',
-                                 'ccopts': '-mabi=32',
-                                 'cfg': ['--without-fp']},
+                                 'ccopts': '-mabi=32'},
                                 {'variant': 'n64-soft',
-                                 'ccopts': '-mabi=64',
-                                 'cfg': ['--without-fp']}])
+                                 'ccopts': '-mabi=64'}])
         self.add_config(arch='mips64el',
                         os_name='linux-gnu',
                         variant='nan2008',
@@ -293,15 +284,12 @@ class Context(object):
                                  '--with-arch-64=mips64r2',
                                  '--with-arch-32=mips32r2',
                                  '--with-float=soft'],
-                        glibcs=[{'variant': 'n32-nan2008-soft',
-                                 'cfg': ['--without-fp']},
+                        glibcs=[{'variant': 'n32-nan2008-soft'},
                                 {'variant': 'nan2008-soft',
                                  'arch': 'mipsel',
-                                 'ccopts': '-mabi=32',
-                                 'cfg': ['--without-fp']},
+                                 'ccopts': '-mabi=32'},
                                 {'variant': 'n64-nan2008-soft',
-                                 'ccopts': '-mabi=64',
-                                 'cfg': ['--without-fp']}])
+                                 'ccopts': '-mabi=64'}])
         self.add_config(arch='nios2',
                         os_name='linux-gnu')
         self.add_config(arch='powerpc',
@@ -314,8 +302,7 @@ class Context(object):
                         os_name='linux-gnu',
                         variant='soft',
                         gcc_cfg=['--disable-multilib', '--with-float=soft',
-                                 '--enable-secureplt'],
-                        glibcs=[{'variant': 'soft', 'cfg': ['--without-fp']}])
+                                 '--enable-secureplt'])
         self.add_config(arch='powerpc64',
                         os_name='linux-gnu',
                         gcc_cfg=['--disable-multilib', '--enable-secureplt'])
@@ -325,13 +312,11 @@ class Context(object):
         self.add_config(arch='powerpc',
                         os_name='linux-gnuspe',
                         gcc_cfg=['--disable-multilib', '--enable-secureplt',
-                                 '--enable-e500-double'],
-                        glibcs=[{'cfg': ['--without-fp']}])
+                                 '--enable-e500-double'])
         self.add_config(arch='powerpc',
                         os_name='linux-gnuspe',
                         variant='e500v1',
-                        gcc_cfg=['--disable-multilib', '--enable-secureplt'],
-                        glibcs=[{'variant': 'e500v1', 'cfg': ['--without-fp']}])
+                        gcc_cfg=['--disable-multilib', '--enable-secureplt'])
         self.add_config(arch='s390x',
                         os_name='linux-gnu',
                         glibcs=[{},
@@ -347,13 +332,11 @@ class Context(object):
         self.add_config(arch='sh4',
                         os_name='linux-gnu',
                         variant='soft',
-                        gcc_cfg=['--without-fp'],
-                        glibcs=[{'variant': 'soft', 'cfg': ['--without-fp']}])
+                        gcc_cfg=['--without-fp'])
         self.add_config(arch='sh4eb',
                         os_name='linux-gnu',
                         variant='soft',
-                        gcc_cfg=['--without-fp'],
-                        glibcs=[{'variant': 'soft', 'cfg': ['--without-fp']}])
+                        gcc_cfg=['--without-fp'])
         self.add_config(arch='sparc64',
                         os_name='linux-gnu',
                         glibcs=[{},