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RISC-V: Use an autoconf template to produce `preconfigure'

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Avoid fiddling with autoconf internals and use AC_DEFINE_UNQUOTED to
define macros in the configuration headers rather than handcoding an
equivalent shell sequence with the use of the `as_echo' undocumented
variable.

Switch to using AC_MSG_ERROR rather than `echo' and `exit' directly for
error handling.  Owing to the lack of any kind of error annotation it
makes it difficult to spot the message in the flood in a parallel build
and neither it is logged in `config.log'.

Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Maciej W. Rozycki 2022-05-13 17:07:23 +01:00
parent 353a1220e3
commit 7b1cfba79e
2 changed files with 82 additions and 15 deletions
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33
sysdeps/riscv/preconfigure
View File

@ -1,3 +1,6 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local preconfigure fragment for sysdeps/riscv
case "$machine" in
riscv*)
xlen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_xlen \(.*\)/\1/p'`
@ -9,8 +12,7 @@ riscv*)
64 | 32)
;;
*)
echo "Unable to determine XLEN" >&2
exit 1
as_fn_error 1 "Unable to determine XLEN" "$LINENO" 5
;;
esac
@ -20,15 +22,13 @@ riscv*)
with_fp_cond=1
;;
32)
echo "glibc does not yet support systems with the F but not D extensions" >&2
exit 1
as_fn_error 1 "glibc does not yet support systems with the F but not D extensions" "$LINENO" 5
;;
"")
with_fp_cond=0
;;
*)
echo "Unable to determine FLEN" >&2
exit 1
as_fn_error 1 "Unable to determine FLEN" "$LINENO" 5
;;
esac
@ -37,31 +37,34 @@ riscv*)
abi_flen=0
;;
single)
echo "glibc does not yet support the single floating-point ABI" >&2
exit 1
as_fn_error 1 "glibc does not yet support the single floating-point ABI" "$LINENO" 5
;;
double)
abi_flen=64
;;
*)
echo "Unable to determine floating-point ABI" >&2
exit 1
as_fn_error 1 "Unable to determine floating-point ABI" "$LINENO" 5
;;
esac
case "$atomic" in
__riscv_atomic)
;;
;;
*)
echo "glibc requires the A extension" >&2
exit 1
as_fn_error 1 "glibc requires the A extension" "$LINENO" 5
;;
esac
base_machine=riscv
machine=riscv/rv$xlen/$float_machine
$as_echo "#define RISCV_ABI_XLEN $xlen" >>confdefs.h
$as_echo "#define RISCV_ABI_FLEN $abi_flen" >>confdefs.h
cat >>confdefs.h <<_ACEOF
#define RISCV_ABI_XLEN $xlen
_ACEOF
cat >>confdefs.h <<_ACEOF
#define RISCV_ABI_FLEN $abi_flen
_ACEOF
;;
esac

64
sysdeps/riscv/preconfigure.ac Normal file
View File

@ -0,0 +1,64 @@
GLIBC_PROVIDES[]dnl See aclocal.m4 in the top level source directory.
# Local preconfigure fragment for sysdeps/riscv
case "$machine" in
riscv*)
xlen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_xlen \(.*\)/\1/p'`
flen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_flen \(.*\)/\1/p'`
float_abi=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_float_abi_\([^ ]*\) .*/\1/p'`
atomic=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | grep '#define __riscv_atomic' | cut -d' ' -f2`
case "$xlen" in
64 | 32)
;;
*)
AC_MSG_ERROR([Unable to determine XLEN], [1])
;;
esac
case "$flen" in
64)
float_machine=rvd
with_fp_cond=1
;;
32)
AC_MSG_ERROR([glibc does not yet support systems with the F but not D extensions], 1)
;;
"")
with_fp_cond=0
;;
*)
AC_MSG_ERROR([Unable to determine FLEN], [1])
;;
esac
case "$float_abi" in
soft)
abi_flen=0
;;
single)
AC_MSG_ERROR([glibc does not yet support the single floating-point ABI], [1])
;;
double)
abi_flen=64
;;
*)
AC_MSG_ERROR([Unable to determine floating-point ABI], [1])
;;
esac
case "$atomic" in
__riscv_atomic)
;;
*)
AC_MSG_ERROR([glibc requires the A extension], [1])
;;
esac
base_machine=riscv
machine=riscv/rv$xlen/$float_machine
AC_DEFINE_UNQUOTED([RISCV_ABI_XLEN], [$xlen])
AC_DEFINE_UNQUOTED([RISCV_ABI_FLEN], [$abi_flen])
;;
esac