mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 08:40:07 +00:00
8df5d34720
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.
22 lines
566 B
Plaintext
22 lines
566 B
Plaintext
# This fragment canonicalizes the machine names for m68k variants.
|
|
|
|
case "$machine" in
|
|
m680?0) base_machine=m68k machine=m68k/m680x0/$machine ;;
|
|
m68k) variant=`(echo "#ifdef __mcoldfire__"
|
|
echo "coldfire"
|
|
echo "#else"
|
|
echo "m680x0/m68020"
|
|
echo "#endif") |
|
|
$CC $CFLAGS $CPPFLAGS -E - |
|
|
grep '^[a-z]'`
|
|
if test -z "$variant"; then
|
|
echo >&2 "Cannot determine m68k processor variant"
|
|
exit 1
|
|
fi
|
|
base_machine=m68k machine=m68k/$variant
|
|
if test "$variant" = "coldfire"; then
|
|
with_fp_cond="defined __mcffpu__"
|
|
fi
|
|
;;
|
|
esac
|