Use gen-libm-test.py to generate ulps table for manual.

This patch extends gen-libm-test.py to generate the ulps table for the
manual, so meaning there is only a single ulps file parser needed and
another Perl script is eliminated.  As with the introduction of
gen-libm-test.py, this is designed to generate exactly the same
libm-err.texi as libm-err-tab.pl did.  (gen-libm-test.py is still
shorter in lines than the old gen-libm-test.pl even after this patch.)
Note that this introduces a Python dependency for building the manual,
which is thus noted in install.texi and NEWS.

Tested building html / info / pdf versions of the manual.

	* math/gen-libm-test.py: Import os.
	(ALL_FLOATS_MANUAL): New constant.
	(ALL_FLOATS_SUFFIX): Likewise.
	(Ulps.all_functions): New function.
	(real_all_ulps): Likewise.
	(generate_err_table_sub): Likewise.
	(generate_err_table): Likewise.
	(main): Handle -s and -m options.
	* manual/libm-err-tab.pl: Remove.
	* manual/Makefile ($(objpfx)stamp-libm-err): Use gen-libm-test.py
	instead of libm-err-tab.pl.
	[$(PERL) != no]: Change condition to [$(if $(PYTHON),$(PERL),no)
	!= no].
	* manual/install.texi (Tools for Compilation): Document
	requirement for Python to build manual.
	* INSTALL: Regenerated.

3 files changed, 10 insertions, 213 deletions

diff --git a/manual/Makefile b/manual/Makefile
index c2756640a7..9c35c9d45f 100644
--- a/manual/Makefile
+++ b/manual/Makefile
@@ -99,10 +99,11 @@ $(objpfx)dir-add.texi: xtract-typefun.awk $(texis-path)
 
 # The table with the math errors is generated.
 $(objpfx)libm-err.texi: $(objpfx)stamp-libm-err
-$(objpfx)stamp-libm-err: libm-err-tab.pl $(wildcard $(foreach dir,$(sysdirs),\
-						     $(dir)/libm-test-ulps))
+$(objpfx)stamp-libm-err: $(..)math/gen-libm-test.py \
+			 $(wildcard $(foreach dir,$(sysdirs),\
+						  $(dir)/libm-test-ulps))
 	pwd=`pwd`; \
-	$(PERL) $< $$pwd/.. > $(objpfx)libm-err-tmp
+	$(PYTHON) $< -s $$pwd/.. -m $(objpfx)libm-err-tmp
 	$(move-if-change) $(objpfx)libm-err-tmp $(objpfx)libm-err.texi
 	touch $@
 
@@ -169,8 +170,9 @@ include ../Rules
 
 .PHONY: install subdir_install install-data
 install-data subdir_install: install
-# Generated files requiring perl: libm-err.texi, summary.texi
-ifneq ($(PERL),no)
+# Generated files requiring python: libm-err.texi
+# Generated files requiring perl: summary.texi
+ifneq ($(if $(PYTHON),$(PERL),no),no)
 ifneq ($(strip $(MAKEINFO)),:)
 install: $(inst_infodir)/libc.info
 	@if $(SHELL) -c '$(INSTALL_INFO) --version' >/dev/null 2>&1; then \
diff --git a/manual/install.texi b/manual/install.texi
index 61178dadcd..08a39f57c9 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -577,8 +577,9 @@ with any version of @code{sed}.  As of release time, @code{sed} version
 @item
 Python 2.7/3.4 or later
 
-Python is required to run some tests.  As of release time, Python 3.6
-is the newest verified to work for testing @theglibc{}.
+Python is required to build the @glibcadj{} manual and to run some
+tests.  As of release time, Python 3.6 is the newest verified to work
+for testing @theglibc{}.
 
 @item PExpect 4.0
 
diff --git a/manual/libm-err-tab.pl b/manual/libm-err-tab.pl
deleted file mode 100755
index 768d2da098..0000000000
--- a/manual/libm-err-tab.pl
+++ /dev/null
@@ -1,206 +0,0 @@
-#!/usr/bin/perl -w
-# Copyright (C) 1999-2018 Free Software Foundation, Inc.
-# This file is part of the GNU C Library.
-# Contributed by Andreas Jaeger <aj@suse.de>, 1999.
-
-# 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/>.
-
-# Information about tests are stored in: %results
-# $results{$test}{"type"} is the result type, e.g. normal or complex.
-# In the following description $platform, $type and $float are:
-# - $platform is the used platform
-# - $type is either "normal", "real" (for the real part of a complex number)
-#   or "imag" (for the imaginary part # of a complex number).
-# - $float is either of float, ifloat, double, idouble, ldouble, ildouble;
-#   It represents the underlying floating point type (float, double or long
-#   double) and if inline functions (the leading i stands for inline)
-#   are used.
-# $results{$test}{$platform}{$type}{$float} is defined and has a delta
-# or 'fail' as value.
-
-use File::Find;
-
-use strict;
-
-use vars qw ($sources @platforms %pplatforms);
-use vars qw (%results @all_floats %suffices %all_functions);
-
-
-# all_floats is in output order and contains all recognised float types that
-# we're going to output
-@all_floats = ('float', 'double', 'ldouble', 'float128');
-%suffices =
-  ( 'float' => 'f',
-    'double' => '',
-    'ldouble' => 'l',
-    'float128' => 'f128'
-  );
-
-# Pretty description of platform
-%pplatforms = ();
-
-%all_functions = ();
-
-if ($#ARGV == 0) {
-  $sources = $ARGV[0];
-} else {
-  $sources = '/usr/src/cvs/libc';
-}
-
-find (\&find_files, $sources);
-
-@platforms = sort by_platforms @platforms;
-
-&print_all;
-
-sub find_files {
-  if ($_ eq 'libm-test-ulps') {
-    # print "Parsing $File::Find::name\n";
-    push @platforms, $File::Find::dir;
-    my ($file, $name);
-    $file = "${File::Find::name}-name";
-    open NAME, $file or die ("Can't open $file: $!");
-    $name = <NAME>;
-    chomp $name;
-    close NAME;
-    $pplatforms{$File::Find::dir} = $name;
-    &parse_ulps ($File::Find::name, $File::Find::dir);
-  }
-}
-
-# Parse ulps file
-sub parse_ulps {
-  my ($file, $platform) = @_;
-  my ($test, $type, $float, $eps, $ignore_fn);
-
-  # $type has the following values:
-  # "normal": No complex variable
-  # "real": Real part of complex result
-  # "imag": Imaginary part of complex result
-  open ULP, $file  or die ("Can't open $file: $!");
-  while (<ULP>) {
-    chop;
-    # ignore comments and empty lines
-    next if /^#/;
-    next if /^\s*$/;
-    if (/^Function: /) {
-      if (/Real part of/) {
-	s/Real part of //;
-	$type = 'real';
-      } elsif (/Imaginary part of/) {
-	s/Imaginary part of //;
-	$type = 'imag';
-      } else {
-	$type = 'normal';
-      }
-      ($test) = ($_ =~ /^Function:\s*\"([a-zA-Z0-9_]+)\"/);
-      next;
-    }
-    if ($test =~ /_(downward|towardzero|upward|vlen)/) {
-      $ignore_fn = 1;
-    } else {
-      $ignore_fn = 0;
-      $all_functions{$test} = 1;
-    }
-    if (/^i?(float|double|ldouble|float128):/) {
-      ($float, $eps) = split /\s*:\s*/,$_,2;
-      if ($ignore_fn) {
-	next;
-      } elsif ($eps eq 'fail') {
-	$results{$test}{$platform}{$type}{$float} = 'fail';
-      } elsif ($eps eq "0") {
-	# ignore
-	next;
-      } elsif (!exists $results{$test}{$platform}{$type}{$float}
-	    || $results{$test}{$platform}{$type}{$float} ne 'fail') {
-	$results{$test}{$platform}{$type}{$float} = $eps;
-      }
-      if ($type =~ /^real|imag$/) {
-	$results{$test}{'type'} = 'complex';
-      } elsif ($type eq 'normal') {
-	$results{$test}{'type'} = 'normal';
-      }
-      next;
-    }
-    print "Skipping unknown entry: `$_'\n";
-  }
-  close ULP;
-}
-
-sub get_value {
-  my ($fct, $platform, $type, $float) = @_;
-
-  return (exists $results{$fct}{$platform}{$type}{$float}
-	  ? $results{$fct}{$platform}{$type}{$float} : "0");
-}
-
-sub print_platforms {
-  my (@p) = @_;
-  my ($fct, $platform, $float, $first, $i, $platform_no, $platform_total);
-
-  print '@multitable {nexttowardf} ';
-  foreach (@p) {
-    print ' {1000 + i 1000}';
-  }
-  print "\n";
-
-  print '@item Function ';
-  foreach (@p) {
-    print ' @tab ';
-    print $pplatforms{$_};
-  }
-  print "\n";
-
-
-  foreach $fct (sort keys %all_functions) {
-    foreach $float (@all_floats) {
-      print "\@item $fct$suffices{$float} ";
-      foreach $platform (@p) {
-	print ' @tab ';
-	if (exists $results{$fct}{$platform}{'normal'}{$float}
-	    || exists $results{$fct}{$platform}{'real'}{$float}
-	    || exists $results{$fct}{$platform}{'imag'}{$float}) {
-	  if ($results{$fct}{'type'} eq 'complex') {
-	    print &get_value ($fct, $platform, 'real', $float),
-	    ' + i ', &get_value ($fct, $platform, 'imag', $float);
-	  } else {
-	    print $results{$fct}{$platform}{'normal'}{$float};
-	  }
-	} else {
-	  print '-';
-	}
-      }
-      print "\n";
-    }
-  }
-
-  print "\@end multitable\n";
-}
-
-sub print_all {
-  my ($i, $max);
-
-  my ($columns) = 5;
-
-  # Print only 5 platforms at a time.
-  for ($i=0; $i < $#platforms; $i+=$columns) {
-    $max = $i+$columns-1 > $#platforms ? $#platforms : $i+$columns-1;
-    print_platforms (@platforms[$i .. $max]);
-  }
-}
-
-sub by_platforms {
-  return $pplatforms{$a} cmp $pplatforms{$b};
-}