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Re: [PATCH] tests: avoid false positive due to change in --help formatti


From: Stefano Lattarini
Subject: Re: [PATCH] tests: avoid false positive due to change in --help formatting
Date: Fri, 4 Nov 2011 20:19:52 +0100
User-agent: KMail/1.13.7 (Linux/2.6.30-2-686; KDE/4.6.5; i686; ; )

On Friday 04 November 2011, Stefano Lattarini wrote:
>
> [SNIP]
>
> Attached is a patch in this spirit; I'll push in a few hours if there is
> no objection.
> 
Oops, wrong patch.  Attached is the correct patch.

Sorry for the noise,
  Stefano
From 8355b2b59221c58b33d686a0a2b4f22a19a3c330 Mon Sep 17 00:00:00 2001
Message-Id: <address@hidden>
From: Stefano Lattarini <address@hidden>
Date: Fri, 4 Nov 2011 20:15:12 +0100
Subject: [PATCH] test defs: new functions to analyze configure help screen

* tests/defs (extract_configure_help, grep_configure_help): New
functions.
* tests/maintmode-configure-msg.test: Use them, reducing code
duplication and test brittleness.
* tests/help-depend.test: Likewise.
* tests/help-depend2.test: Likewise.
* tests/help-dmalloc.test: Likewise.
* tests/help-lispdir.test: Likewise.
* tests/help-multilib.test: Likewise.
* tests/help-python.test: Likewise.
* tests/help-regex.test: Likewise.
* tests/help-silent.test: Likewise.
* tests/help-upc.test: Likewise.
* tests/help-init.test: Make grepping of configure help screen
slightly stricter.
* tests/self-check-configure-help.test: New self test.
* tests/Makefile.am (TESTS): Add it.

From a report by Jim Meyering.
---
 ChangeLog                            |   22 +++
 tests/Makefile.am                    |    1 +
 tests/Makefile.in                    |    1 +
 tests/defs                           |   48 ++++++
 tests/help-depend.test               |   10 +-
 tests/help-depend2.test              |   10 +-
 tests/help-dmalloc.test              |    7 +-
 tests/help-init.test                 |    6 +-
 tests/help-lispdir.test              |    9 +-
 tests/help-multilib.test             |    6 +-
 tests/help-python.test               |    5 +-
 tests/help-regex.test                |    7 +-
 tests/help-silent.test               |   12 +-
 tests/help-upc.test                  |    7 +-
 tests/maintmode-configure-msg.test   |   10 +-
 tests/self-check-configure-help.test |  274 ++++++++++++++++++++++++++++++++++
 16 files changed, 375 insertions(+), 60 deletions(-)
 create mode 100755 tests/self-check-configure-help.test

diff --git a/ChangeLog b/ChangeLog
index 7363e1a..f22fa84 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,25 @@
+2011-11-04  Stefano Lattarini  <address@hidden>
+
+       test defs: new functions to analyze configure help screen
+       * tests/defs (extract_configure_help, grep_configure_help): New
+       functions.
+       * tests/maintmode-configure-msg.test: Use them, reducing code
+       duplication and test brittleness.
+       * tests/help-depend.test: Likewise.
+       * tests/help-depend2.test: Likewise.
+       * tests/help-dmalloc.test: Likewise.
+       * tests/help-lispdir.test: Likewise.
+       * tests/help-multilib.test: Likewise.
+       * tests/help-python.test: Likewise.
+       * tests/help-regex.test: Likewise.
+       * tests/help-silent.test: Likewise.
+       * tests/help-upc.test: Likewise.
+       * tests/help-init.test: Make grepping of configure help screen
+       slightly stricter.
+       * tests/self-check-configure-help.test: New self test.
+       * tests/Makefile.am (TESTS): Add it.
+       From a report by Jim Meyering.
+
 2011-11-03  Stefano Lattarini  <address@hidden>
 
        tests: various minor tweakings, mostly related to AM_PROG_AR
diff --git a/tests/Makefile.am b/tests/Makefile.am
index b5ad95a..00af436 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -900,6 +900,7 @@ reqd2.test \
 repeated-options.test \
 rulepat.test \
 self-check-cleanup.test \
+self-check-configure-help.test \
 self-check-dir.test \
 self-check-env-sanitize.test \
 self-check-exit.test \
diff --git a/tests/Makefile.in b/tests/Makefile.in
index babba97..1179ed2 100644
--- a/tests/Makefile.in
+++ b/tests/Makefile.in
@@ -1176,6 +1176,7 @@ reqd2.test \
 repeated-options.test \
 rulepat.test \
 self-check-cleanup.test \
+self-check-configure-help.test \
 self-check-dir.test \
 self-check-env-sanitize.test \
 self-check-exit.test \
diff --git a/tests/defs b/tests/defs
index 1c9dd90..93a2106 100644
--- a/tests/defs
+++ b/tests/defs
@@ -186,6 +186,54 @@ AUTOMAKE_fails ()
   AUTOMAKE_run 1 ${1+"$@"}
 }
 
+# extract_configure_help { --OPTION | VARIABLE-NAME } [FILES]
+# -----------------------------------------------------------
+# Use this to extract from the output of `./configure --help' (or similar)
+# the description or help message associated to the given --OPTION or
+# VARIABLE-NAME.
+extract_configure_help ()
+{
+  am__opt_re='' am__var_re=''
+  case $1 in
+    --*'=')   am__opt_re="^  $1";;
+    --*'[=]') am__opt_re='^  '`printf '%s\n' "$1" | sed 's/...$//'`'\[=';;
+    --*)      am__opt_re="^  $1( .*|$)";;
+      *)      am__var_re="^  $1( .*|$)";;
+  esac
+  shift
+  if test x"$am__opt_re" != x; then
+    LC_ALL=C awk '
+      /'"$am__opt_re"'/        { print; do_print = 1; next; }
+      /^$/                     { do_print = 0; next }
+      /^  --/                  { do_print = 0; next }
+      (do_print == 1)          { print }
+    ' ${1+"$@"}
+  else
+    LC_ALL=C awk '
+      /'"$am__var_re"'/        { print; do_print = 1; next; }
+      /^$/                     { do_print = 0; next }
+      /^  [A-Z][A-Z0-9_]* /    { do_print = 0; next }
+      /^  [A-Z][A-Z0-9_]*$/    { do_print = 0; next }
+      (do_print == 1)          { print }
+    ' ${1+"$@"}
+  fi
+}
+
+# grep_configure_help { --OPTION | VARIABLE-NAME } REGEXP
+# -------------------------------------------------------
+# Grep the section of `./configure --help' output associated with either
+# --OPTION or VARIABLE-NAME for the given *extended* regular expression.
+grep_configure_help ()
+{
+  ./configure --help > am--all-help \
+    || { cat am--all-help; Exit 1; }
+  cat am--all-help
+  extract_configure_help "$1" am--all-help > am--our-help \
+    || { cat am--our-help; Exit 1; }
+  cat am--our-help
+  $EGREP "$2" am--our-help || Exit 1
+}
+
 # using_gmake
 # -----------
 # Return success if $MAKE is GNU make, return failure otherwise.
diff --git a/tests/help-depend.test b/tests/help-depend.test
index e25f264..651e048 100755
--- a/tests/help-depend.test
+++ b/tests/help-depend.test
@@ -28,12 +28,10 @@ END
 $ACLOCAL
 $AUTOCONF
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
+grep_configure_help --enable-dependency-tracking \
+                    ' not reject slow dependency extract'
 
-$EGREP '^  *--enable-dependency-tracking( |$)' stdout
-$EGREP '^  *--disable-dependency-tracking( |$)' stdout
-$FGREP ' speeds up one-time build' stdout
-$FGREP ' slow dependency extract' stdout
+grep_configure_help --disable-dependency-tracking \
+                    ' speeds up one-time build'
 
 :
diff --git a/tests/help-depend2.test b/tests/help-depend2.test
index 0eb5447..d44ff7a 100755
--- a/tests/help-depend2.test
+++ b/tests/help-depend2.test
@@ -29,12 +29,10 @@ END
 $ACLOCAL
 $AUTOCONF
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
+grep_configure_help --enable-dependency-tracking \
+                    ' not reject slow dependency extract'
 
-$EGREP '^  *--enable-dependency-tracking( |$)' stdout
-$EGREP '^  *--disable-dependency-tracking( |$)' stdout
-$FGREP ' speeds up one-time build' stdout
-$FGREP ' slow dependency extract' stdout
+grep_configure_help --disable-dependency-tracking \
+                    ' speeds up one-time build'
 
 :
diff --git a/tests/help-dmalloc.test b/tests/help-dmalloc.test
index 708805b..dc8c4c1 100755
--- a/tests/help-dmalloc.test
+++ b/tests/help-dmalloc.test
@@ -27,11 +27,6 @@ END
 $ACLOCAL
 $AUTOCONF
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-
-$EGREP '^   *--with-dmalloc( |$) ' stdout
-$FGREP ' use dmalloc' stdout
-$FGREP 'www.dmalloc.com' stdout
+grep_configure_help --with-dmalloc ' use dmalloc.*http://www\.dmalloc\.com'
 
 :
diff --git a/tests/help-init.test b/tests/help-init.test
index 7698623..8b5ec71 100755
--- a/tests/help-init.test
+++ b/tests/help-init.test
@@ -30,8 +30,8 @@ $AUTOCONF
 ./configure --help >stdout || { cat stdout; Exit 1; }
 cat stdout
 
-grep '^  *--program-prefix[= ]' stdout
-grep '^  *--program-suffix[= ]' stdout
-grep '^  *--program-transform-name[= ]' stdout
+grep '^  --program-prefix[= ]' stdout
+grep '^  --program-suffix[= ]' stdout
+grep '^  --program-transform-name[= ]' stdout
 
 :
diff --git a/tests/help-lispdir.test b/tests/help-lispdir.test
index a308021..9a72189 100755
--- a/tests/help-lispdir.test
+++ b/tests/help-lispdir.test
@@ -30,11 +30,8 @@ $AUTOCONF
 ./configure --help >stdout || { cat stdout; Exit 1; }
 cat stdout
 
-$EGREP '^  *--with-lispdir( |$)' stdout
-grep ' override.*lisp directory' stdout
-$EGREP '^  *EMACS( |$)' stdout
-grep ' .*[eE]macs editor' stdout
-$EGREP '^  *EMACSLOADPATH( |$)' stdout
-grep ' .*[eE]macs library search path' stdout
+grep_configure_help --with-lispdir ' override.*lisp directory'
+grep_configure_help EMACS          ' [eE]macs editor'
+grep_configure_help EMACSLOADPATH  ' [eE]macs library search path'
 
 :
diff --git a/tests/help-multilib.test b/tests/help-multilib.test
index e0bf6c7..d4df64d 100755
--- a/tests/help-multilib.test
+++ b/tests/help-multilib.test
@@ -27,10 +27,6 @@ END
 $ACLOCAL
 $AUTOCONF
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-
-$EGREP '^  *--enable-multilib( |$)' stdout
-$FGREP ' many library versions (default)' stdout
+grep_configure_help --enable-multilib ' many library versions \(default\)'
 
 :
diff --git a/tests/help-python.test b/tests/help-python.test
index e6a6fd3..9e4e48a 100755
--- a/tests/help-python.test
+++ b/tests/help-python.test
@@ -27,9 +27,6 @@ END
 $ACLOCAL
 $AUTOCONF
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-
-grep '^  *PYTHON  *the Python interpreter$' stdout
+grep_configure_help PYTHON 'the Python interpreter'
 
 :
diff --git a/tests/help-regex.test b/tests/help-regex.test
index aecfed9..2ae7704 100755
--- a/tests/help-regex.test
+++ b/tests/help-regex.test
@@ -26,11 +26,6 @@ END
 
 $ACLOCAL
 $AUTOCONF
-
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-
-$FGREP ' --without-regex ' stdout
-$FGREP ' use GNU rx ' stdout
+grep_configure_help --without-regex ' use GNU rx($| )'
 
 :
diff --git a/tests/help-silent.test b/tests/help-silent.test
index e41d166..855be52 100755
--- a/tests/help-silent.test
+++ b/tests/help-silent.test
@@ -28,16 +28,16 @@ $ACLOCAL
 
 mv -f configure.in configure.tmpl
 
+q="[\`'\"]"
+
 for args in '' '([])' '([yes])' '([no])'; do
   sed "s/AM_SILENT_RULES.*/&$args/" configure.tmpl >configure.in
   cat configure.in
   $AUTOCONF --force
-  ./configure --help >stdout || { cat stdout; Exit 1; }
-  cat stdout
-  $EGREP '^  *--enable-silent-rules( |$)' stdout
-  grep ' less verbose build.*undo.*make V=1' stdout
-  $EGREP '^  *--disable-silent-rules ( |$)' stdout
-  grep ' verbose build.*undo.*make V=0' stdout
+  grep_configure_help --enable-silent-rules \
+                      " less verbose build.*\\(undo.*${q}make V=1${q}"
+  grep_configure_help --disable-silent-rules \
+                      " verbose build.*\\(undo.*${q}make V=0${q}"
 done
 
 :
diff --git a/tests/help-upc.test b/tests/help-upc.test
index a30c84c..0438b4d 100755
--- a/tests/help-upc.test
+++ b/tests/help-upc.test
@@ -27,10 +27,7 @@ END
 $ACLOCAL
 $AUTOCONF
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-
-grep '^  *UPCFLAGS .*Unified Parallel C compiler flags' stdout
-grep '^  *UPC .*Unified Parallel C compiler command' stdout
+grep_configure_help UPC      '[Uu]nified Parallel C compiler command'
+grep_configure_help UPCFLAGS '[Uu]nified Parallel C compiler flags'
 
 :
diff --git a/tests/maintmode-configure-msg.test 
b/tests/maintmode-configure-msg.test
index 5771392..f32c4fa 100755
--- a/tests/maintmode-configure-msg.test
+++ b/tests/maintmode-configure-msg.test
@@ -49,9 +49,7 @@ $ACLOCAL
 
 $AUTOCONF --force
 
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-grep '^  *--enable-maintainer-mode.* enable make rules' stdout
+grep_configure_help --enable-maintainer-mode 'enable make rules'
 
 check_configure_message_with "no"
 check_configure_message_with "yes" --enable-maintainer-mode
@@ -59,9 +57,7 @@ check_configure_message_with "yes" --enable-maintainer-mode
 set_maintmode "disable"
 
 $AUTOCONF --force
-./configure --help >stdout || { cat stdout; Exit 1; }
-cat stdout
-grep '^  *--enable-maintainer-mode.* enable make rules' stdout
+grep_configure_help --enable-maintainer-mode 'enable make rules'
 
 check_configure_message_with "no"
 check_configure_message_with "yes" --enable-maintainer-mode
@@ -71,7 +67,7 @@ set_maintmode "enable"
 $AUTOCONF --force
 ./configure --help >stdout || { cat stdout; Exit 1; }
 cat stdout
-grep '^  *--disable-maintainer-mode.* disable make rules' stdout
+grep_configure_help --disable-maintainer-mode 'disable make rules'
 
 check_configure_message_with "yes"
 check_configure_message_with "no" --disable-maintainer-mode
diff --git a/tests/self-check-configure-help.test 
b/tests/self-check-configure-help.test
new file mode 100755
index 0000000..16f4b50
--- /dev/null
+++ b/tests/self-check-configure-help.test
@@ -0,0 +1,274 @@
+#! /bin/sh
+# Copyright (C) 2011 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Sanity check on the function used by the automake testsuite to
+# analyze output of "configure --help".
+
+. ./defs || Exit 1
+
+# FIXME: this test is a good candidate for a conversion to TAP.
+
+# Prefer real-world data.  This is from the help screen of the
+# configure script from GNU coreutils, with small adaptations.
+cat > help <<'END'
+`configure' configures GNU coreutils 8.14a to adapt to many kinds of systems.
+
+Usage: ./configure [OPTION]... [VAR=VALUE]...
+
+To assign environment variables (e.g., CC, CFLAGS...), specify them as
+VAR=VALUE.  See below for descriptions of some of the useful variables.
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  -h, --help              display this help and exit
+      --help=short        display options specific to this package
+      --help=recursive    display the short help of all the included packages
+  -V, --version           display version information and exit
+  -q, --quiet, --silent   do not print `checking ...' messages
+      --cache-file=FILE   cache test results in FILE [disabled]
+  -C, --config-cache      alias for `--cache-file=config.cache'
+  -n, --no-create         do not create output files
+      --srcdir=DIR        find the sources in DIR [configure dir or `..']
+
+Installation directories:
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [/usr/local]
+  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
+                          [PREFIX]
+
+By default, `make install' will install all the files in
+`/usr/local/bin', `/usr/local/lib' etc.  You can specify
+an installation prefix other than `/usr/local' using `--prefix',
+for instance `--prefix=$HOME'.
+
+For better control, use the options below.
+
+Fine tuning of the installation directories:
+  --bindir=DIR            user executables [EPREFIX/bin]
+  --sbindir=DIR           system admin executables [EPREFIX/sbin]
+  --libexecdir=DIR        program executables [EPREFIX/libexec]
+  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --libdir=DIR            object code libraries [EPREFIX/lib]
+  --includedir=DIR        C header files [PREFIX/include]
+  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
+  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
+  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
+  --infodir=DIR           info documentation [DATAROOTDIR/info]
+  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
+  --mandir=DIR            man documentation [DATAROOTDIR/man]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/coreutils]
+  --htmldir=DIR           html documentation [DOCDIR]
+  --dvidir=DIR            dvi documentation [DOCDIR]
+  --pdfdir=DIR            pdf documentation [DOCDIR]
+  --psdir=DIR             ps documentation [DOCDIR]
+
+Program names:
+  --program-prefix=PREFIX            prepend PREFIX to installed program names
+  --program-suffix=SUFFIX            append SUFFIX to installed program names
+  --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
+
+System types:
+  --build=BUILD     configure for building on BUILD [guessed]
+  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
+
+Optional Features:
+  --disable-option-checking  ignore unrecognized --enable/--with options
+  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
+  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --enable-silent-rules          less verbose build output (undo: `make V=1')
+  --disable-silent-rules         verbose build output (undo: `make V=0')
+  --disable-dependency-tracking  speeds up one-time build
+  --enable-dependency-tracking   do not reject slow dependency extractors
+  --disable-largefile     omit support for large files
+  --enable-threads={posix|solaris|pth|win32}
+                          specify multithreading API
+  --disable-threads       build without multithread safety
+  --disable-acl           do not support ACLs
+  --disable-assert        turn off assertions
+  --disable-rpath         do not hardcode runtime library paths
+  --disable-xattr         do not support extended attributes
+  --disable-libcap        disable libcap support
+  --enable-gcc-warnings   turn on lots of GCC warnings (for developers)
+  --enable-install-program=PROG_LIST
+                          install the programs in PROG_LIST (comma-separated,
+                          default: none)
+  --enable-no-install-program=PROG_LIST
+                          do NOT install the programs in PROG_LIST
+                          (comma-separated, default: arch,hostname,su)
+  --disable-nls           do not use Native Language Support
+
+Optional Packages:
+  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+  --with-gnu-ld           assume the C compiler uses GNU ld default=no
+  --with-libiconv-prefix[=DIR]  search for libiconv in DIR/include and DIR/lib
+  --without-libiconv-prefix     don't search for libiconv in includedir and 
libdir
+  --with-libpth-prefix[=DIR]  search for libpth in DIR/include and DIR/lib
+  --without-libpth-prefix     don't search for libpth in includedir and libdir
+  --without-included-regex
+                          don't compile regex; this is the default on systems
+                          with recent-enough versions of the GNU C Library
+                          (use with caution on other systems).
+  --without-selinux       do not use SELinux, even on systems with SELinux
+  --with-packager         String identifying the packager of this software
+  --with-packager-version Packager-specific version information
+  --with-packager-bug-reports
+                          Packager info for bug reports (URL/e-mail/...)
+  --with-tty-group[=NAME]
+                          group used by system for TTYs, "tty" when not
+                          specified (default: do not rely on any group used
+                          for TTYs)
+  --without-gmp           do not use the GNU MP library for arbitrary
+                          precision calculation (default: use it if available)
+  --with-libintl-prefix[=DIR]  search for libintl in DIR/include and DIR/lib
+  --without-libintl-prefix     don't search for libintl in includedir and 
libdir
+
+Some influential environment variables:
+  CC          C compiler command
+  CFLAGS      C compiler flags
+  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
+              nonstandard directory <lib dir>
+  LIBS        libraries to pass to the linker, e.g. -l<library>
+  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
+              you have headers in a nonstandard directory <include dir>
+  CPP         C preprocessor
+  YACC        The `Yet Another C Compiler' implementation to use. Defaults to
+              `bison -y'. Values other than `bison -y' will most likely break
+              on most systems.
+  YFLAGS      YFLAGS contains the list arguments that will be passed by
+              default to Bison. This script will default YFLAGS to the empty
+              string to avoid a default value of `-d' given by some make
+              applications.
+  DEFAULT_POSIX2_VERSION
+              POSIX version to default to; see 'config.hin'.
+
+Use these variables to override the choices made by `configure' or to help
+it to find libraries and programs with nonstandard names/locations.
+
+Report bugs to <address@hidden>.
+General help using GNU software: <http://www.gnu.org/gethelp/>.
+END
+
+compare_extracted_help ()
+{
+  cat > exp || Exit 99
+  extract_configure_help "$1" help > got || Exit 1
+  cat exp
+  cat got
+  diff exp got || Exit 1
+}
+
+compare_extracted_help --disable-libcap <<'END'
+  --disable-libcap        disable libcap support
+END
+
+compare_extracted_help --disable-nls <<'END'
+  --disable-nls           do not use Native Language Support
+END
+
+compare_extracted_help --disable-option-checking <<'END'
+  --disable-option-checking  ignore unrecognized --enable/--with options
+END
+
+compare_extracted_help --build= <<'END'
+  --build=BUILD     configure for building on BUILD [guessed]
+END
+
+compare_extracted_help --host= <<'END'
+  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
+END
+
+compare_extracted_help '--with-libintl-prefix[=]' <<'END'
+  --with-libintl-prefix[=DIR]  search for libintl in DIR/include and DIR/lib
+END
+
+compare_extracted_help --without-included-regex <<'END'
+  --without-included-regex
+                          don't compile regex; this is the default on systems
+                          with recent-enough versions of the GNU C Library
+                          (use with caution on other systems).
+END
+
+compare_extracted_help --enable-threads= <<'END'
+  --enable-threads={posix|solaris|pth|win32}
+                          specify multithreading API
+END
+
+compare_extracted_help '--with-tty-group[=]' <<'END'
+  --with-tty-group[=NAME]
+                          group used by system for TTYs, "tty" when not
+                          specified (default: do not rely on any group used
+                          for TTYs)
+END
+
+compare_extracted_help '--prefix=' <<'END'
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [/usr/local]
+END
+
+compare_extracted_help '--exec-prefix=' <<'END'
+  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
+                          [PREFIX]
+END
+
+compare_extracted_help CC <<'END'
+  CC          C compiler command
+END
+
+compare_extracted_help CPP <<'END'
+  CPP         C preprocessor
+END
+
+compare_extracted_help CPPFLAGS <<'END'
+  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
+              you have headers in a nonstandard directory <include dir>
+END
+
+compare_extracted_help YACC <<'END'
+  YACC        The `Yet Another C Compiler' implementation to use. Defaults to
+              `bison -y'. Values other than `bison -y' will most likely break
+              on most systems.
+END
+
+compare_extracted_help DEFAULT_POSIX2_VERSION <<'END'
+  DEFAULT_POSIX2_VERSION
+              POSIX version to default to; see 'config.hin'.
+END
+
+for o in \
+  '--nonesuch' \
+  '--nonesuch=' \
+  '--nonesuch[=]' \
+  '--disable-nls=' \
+  '--disable-nls[=]' \
+  '--without-included-regex=' \
+  '--without-included-regex[=]' \
+  '--prefix' \
+  '--prefix[=]' \
+  '--build' \
+  '--build[=]' \
+  '--with-tty-group' \
+  '--with-tty-group=' \
+  'NO_SUCH_VAR' \
+  'NOSUCHVAR' \
+; do
+  compare_extracted_help "$o" </dev/null
+done
+
+:
-- 
1.7.2.3


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