[SCM] GNU Autoconf source repository branch, master, updated. v2.63b-51-g5f19cfb
"Eric Blake" <[email protected]>
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commit 5f19cfb87838c2c04951b05ee4a33aa18db5ccd2
Author: Eric Blake <[email protected]>
Date: Mon May 4 11:00:30 2009 -0600
Sanitize more problematic environment variables.
* doc/autoconf.texi (Environment Variable Index): Add more
entries, particularly for precious variables and known culprit
variables. Needed to avoid overfull vbox.
(Special Shell Variables) <CLICOLOR_FORCE, GREP_OPTIONS>: Add
variables known to cause misbehavior.
* lib/m4sugar/m4sh.m4 (_AS_DETECT_BETTER_SHELL): Unset variables
known to cause problems.
* THANKS: Update.
Based on reports from Ilya Bobir and Joey Mingrone.
Signed-off-by: Eric Blake <[email protected]>
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 13 +++++++++++
THANKS | 2 +
doc/autoconf.texi | 57 ++++++++++++++++++++++++++++++++++++++++++++++++--
lib/m4sugar/m4sh.m4 | 3 ++
4 files changed, 72 insertions(+), 3 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 73fc483..e07b300 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2009-05-26 Eric Blake <[email protected]>
+
+ Sanitize more problematic environment variables.
+ * doc/autoconf.texi (Environment Variable Index): Add more
+ entries, particularly for precious variables and known culprit
+ variables. Needed to avoid overfull vbox.
+ (Special Shell Variables) <CLICOLOR_FORCE, GREP_OPTIONS>: Add
+ variables known to cause misbehavior.
+ * lib/m4sugar/m4sh.m4 (_AS_DETECT_BETTER_SHELL): Unset variables
+ known to cause problems.
+ * THANKS: Update.
+ Based on reports from Ilya Bobir and Joey Mingrone.
+
2009-05-21 Ralf Wildenhues <[email protected]>
Document VPATH = $(variable) issue in VPATH chapter.
diff --git a/THANKS b/THANKS
index 8bf999a..3c2843b 100644
--- a/THANKS
+++ b/THANKS
@@ -153,6 +153,7 @@ Howard Chu [email protected]
Ian Lance Taylor [email protected]
Ian Macdonald [email protected]
Ian Redfern [email protected]
+Ilya Bobir [email protected]
Ilya Zakharevich [email protected]
Ineiev [email protected]
Iohannes m zmoelnig [email protected]
@@ -175,6 +176,7 @@ Jim Meyering [email protected]
Jiro Takabatake [email protected]
Jochen Friedrich [email protected]
Joel E. Denny [email protected]
+Joey Mingrone [email protected]
Johan Danielsson [email protected]
John Calcote [email protected]
John David Anglin [email protected]
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index a26b1b7..3ddecdf 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -2099,6 +2099,7 @@ but there is actually a hidden slave: @file{config.status}.
results of @file{configure}. The most typical task of
@file{config.status} is to @emph{instantiate} files.
+@acindex{CONFIG_@var{ITEMS}}
This section describes the common behavior of the four standard
instantiating macros: @code{AC_CONFIG_FILES}, @code{AC_CONFIG_HEADERS},
@code{AC_CONFIG_COMMANDS} and @code{AC_CONFIG_LINKS}. They all
@@ -2327,7 +2328,7 @@ Autoconf macros set additional output variables, which are mentioned in
the descriptions for those macros. @xref{Output Variable Index}, for a
complete list of output variables. @xref{Installation Directory
Variables}, for the list of the preset ones related to installation
-directories. Below are listed the other preset ones. They all are
+directories. Below are listed the other preset ones, many of which are
precious variables (@pxref{Setting Output Variables},
@code{AC_ARG_VAR}).
@@ -2338,6 +2339,7 @@ precious variables (@pxref{Setting Output Variables},
@c actress
@defvar CFLAGS
+@evindex CFLAGS
@ovindex CFLAGS
Debugging and optimization options for the C compiler. If it is not set
in the environment when @command{configure} runs, the default value is set
@@ -2392,6 +2394,7 @@ needs to be processed by @command{configure} in order to be used.
@end defvar
@defvar CPPFLAGS
+@evindex CPPFLAGS
@ovindex CPPFLAGS
Preprocessor options for the C, C++, and Objective C preprocessors and
compilers. If
@@ -2416,6 +2419,7 @@ might run into.
@end defvar
@defvar CXXFLAGS
+@evindex CXXFLAGS
@ovindex CXXFLAGS
Debugging and optimization options for the C++ compiler. It acts like
@code{CFLAGS}, but for C++ instead of C.
@@ -2453,6 +2457,7 @@ want to use it.
@end defvar
@defvar ERLCFLAGS
+@evindex ERLCFLAGS
@ovindex ERLCFLAGS
Debugging and optimization options for the Erlang compiler. If it is not set
in the environment when @command{configure} runs, the default value is empty.
@@ -2461,6 +2466,7 @@ programs to test for Erlang features.
@end defvar
@defvar FCFLAGS
+@evindex FCFLAGS
@ovindex FCFLAGS
Debugging and optimization options for the Fortran compiler. If it
is not set in the environment when @command{configure} runs, the default
@@ -2470,6 +2476,7 @@ programs to test for Fortran features.
@end defvar
@defvar FFLAGS
+@evindex FFLAGS
@ovindex FFLAGS
Debugging and optimization options for the Fortran 77 compiler. If it
is not set in the environment when @command{configure} runs, the default
@@ -2479,6 +2486,7 @@ programs to test for Fortran 77 features.
@end defvar
@defvar LDFLAGS
+@evindex LDFLAGS
@ovindex LDFLAGS
Options for the linker. If it is not set
in the environment when @command{configure} runs, the default value is empty.
@@ -2495,6 +2503,7 @@ Don't use this variable to pass library names
@end defvar
@defvar LIBS
+@evindex LIBS
@ovindex LIBS
@option{-l} options to pass to the linker. The default value is empty,
but some Autoconf macros may prepend extra libraries to this variable if
@@ -2504,6 +2513,7 @@ programs to test for C, C++, and Fortran features.
@end defvar
@defvar OBJCFLAGS
+@evindex OBJCFLAGS
@ovindex OBJCFLAGS
Debugging and optimization options for the Objective C compiler. It
acts like @code{CFLAGS}, but for Objective C instead of C.
@@ -3996,6 +4006,8 @@ information about portability problems with Sed.
@defmac AC_PROG_YACC
@acindex{PROG_YACC}
+@evindex YACC
+@evindex YFLAGS
@ovindex YACC
If @code{bison} is found, set output variable @code{YACC} to @samp{bison
-y}. Otherwise, if @code{byacc} is found, set @code{YACC} to
@@ -6704,6 +6716,8 @@ makes this invalid. That is why Autoconf stopped issuing
@defmac AC_PROG_CC (@ovar{compiler-search-list})
@acindex{PROG_CC}
+@evindex CC
+@evindex CFLAGS
@ovindex CC
@ovindex CFLAGS
Determine a C compiler to use. If @code{CC} is not already set in the
@@ -6764,6 +6778,7 @@ rule.
@defmac AC_PROG_CPP
@acindex{PROG_CPP}
+@evindex CPP
@ovindex CPP
Set output variable @code{CPP} to a command that runs the
C preprocessor. If @samp{$CC -E} doesn't work, @file{/lib/cpp} is used.
@@ -7095,6 +7110,8 @@ compiler fix the header files automatically when installed.
@defmac AC_PROG_CXX (@ovar{compiler-search-list})
@acindex{PROG_CXX}
+@evindex CXX
+@evindex CXXFLAGS
@ovindex CXX
@ovindex CXXFLAGS
Determine a C++ compiler to use. Check whether the environment variable
@@ -7126,6 +7143,7 @@ compilers.
@defmac AC_PROG_CXXCPP
@acindex{PROG_CXXCPP}
+@evindex CXXCPP
@ovindex CXXCPP
Set output variable @code{CXXCPP} to a command that runs the C++
preprocessor. If @samp{$CXX -E} doesn't work, @file{/lib/cpp} is used.
@@ -7154,6 +7172,8 @@ if it does not.
@defmac AC_PROG_OBJC (@ovar{compiler-search-list})
@acindex{PROG_OBJC}
+@evindex OBJC
+@evindex OBJCFLAGS
@ovindex OBJC
@ovindex OBJCFLAGS
Determine an Objective C compiler to use. If @code{OBJC} is not already
@@ -7180,6 +7200,7 @@ compiler (@option{-O2} on systems where @command{gcc} does not accept
@defmac AC_PROG_OBJCPP
@acindex{PROG_OBJCPP}
+@evindex OBJCPP
@ovindex OBJCPP
Set output variable @code{OBJCPP} to a command that runs the Objective C
preprocessor. If @samp{$OBJC -E} doesn't work, @file{/lib/cpp} is used.
@@ -7195,6 +7216,8 @@ Erlang/OTP programs:
@defmac AC_ERLANG_PATH_ERLC (@ovar{value-if-not-found}, @dvar{path, $PATH})
@acindex{ERLANG_PATH_ERLC}
+@evindex ERLC
+@evindex ERLCFLAGS
@ovindex ERLC
@ovindex ERLCFLAGS
Determine an Erlang compiler to use. If @code{ERLC} is not already set in the
@@ -7221,6 +7244,7 @@ program is not found.
@defmac AC_ERLANG_PATH_ERL (@ovar{value-if-not-found}, @dvar{path, $PATH})
@acindex{ERLANG_PATH_ERL}
+@evindex ERL
@ovindex ERL
Determine an Erlang interpreter to use. If @code{ERL} is not already
set in the
@@ -7266,6 +7290,8 @@ section.
@defmac AC_PROG_F77 (@ovar{compiler-search-list})
@acindex{PROG_F77}
+@evindex F77
+@evindex FFLAGS
@ovindex F77
@ovindex FFLAGS
Determine a Fortran 77 compiler to use. If @code{F77} is not already
@@ -7294,6 +7320,8 @@ where @code{g77} does not accept @option{-g}). Otherwise, set
@defmac AC_PROG_FC (@ovar{compiler-search-list}, @ovar{dialect})
@acindex{PROG_FC}
+@evindex FC
+@evindex FCFLAGS
@ovindex FC
@ovindex FCFLAGS
Determine a Fortran compiler to use. If @code{FC} is not already set in
@@ -14941,6 +14969,7 @@ $ @kbd{zsh -c 'false; $empty; echo $?'}
@end example
@item _
+@evindex _
Many shells reserve @samp{$_} for various purposes, e.g., the name of
the last command executed.
@@ -14975,6 +15004,14 @@ absolute or anchored at @samp{./}, as in @samp{abs=`cd ./src && pwd`}.
Configure scripts use M4sh, which automatically unsets @env{CDPATH} if
possible, so you need not worry about this problem in those scripts.
+@item CLICOLOR_FORCE
+@evindex CLICOLOR_FORCE
+When this variable is set, some implementations of tools like
+@command{ls} attempt to add color to their output via terminal escape
+sequences, even when the output is not directed to a terminal, and can
+thus cause spurious failures in scripts. Configure scripts use M4sh,
+which automatically unsets this variable.
+
@item DUALCASE
@evindex DUALCASE
In the MKS shell, case statements and file name generation are
@@ -15013,12 +15050,21 @@ PS4='+ '
see @pxref{unset, , Limitations of Shell Builtins}).
@item FPATH
+@evindex FPATH
The Korn shell uses @env{FPATH} to find shell functions, so avoid
@env{FPATH} in portable scripts. @env{FPATH} is consulted after
@env{PATH}, but you still need to be wary of tests that use @env{PATH}
to find whether a command exists, since they might report the wrong
result if @env{FPATH} is also set.
+@item GREP_OPTIONS
+@evindex GREP_OPTIONS
+When this variable is set, some implementations of @command{grep} honor
+these options, even if the options include direction to enable colored
+output via terminal escape sequences, and the result can cause spurious
+failures when the output is not directed to a terminal. Configure
+scripts use M4sh, which automatically unsets this variable.
+
@item IFS
@evindex IFS
Long ago, shell scripts inherited @env{IFS} from the environment,
@@ -15090,6 +15136,7 @@ are treated like their Posix brethren (@env{LC_COLLATE},
etc.)@: as described above.
@item LINENO
+@evindex LINENO
Most modern shells provide the current line number in @code{LINENO}.
Its value is the line number of the beginning of the current command.
M4sh, and hence Autoconf, attempts to execute @command{configure} with
@@ -15258,6 +15305,7 @@ points to the wrong directory. Use @samp{`pwd`} rather than
@samp{$PWD}.
@item RANDOM
+@evindex RANDOM
Many shells provide @code{RANDOM}, a variable that returns a different
integer each time it is used. Most of the time, its value does not
change when it is not used, but on @sc{irix} 6.5 the value changes all
@@ -15266,6 +15314,7 @@ practice to use @code{$RANDOM} as part of a file name, but code
shouldn't rely on @code{$RANDOM} expanding to a nonempty string.
@item status
+@evindex status
This variable is an alias to @samp{$?} for @code{zsh} (at least 3.1.6),
hence read-only. Do not use it.
@end table
@@ -22077,6 +22126,8 @@ The @code{LIBOBJDIR} feature is experimental.
@c the anchor keeps the old node name, to try to avoid breaking links
@anchor{AC_FOO_IFELSE vs AC_TRY_FOO}
+@acindex{@var{ACT}_IFELSE}
+@acindex{TRY_@var{ACT}}
Since Autoconf 2.50, internal codes uses @code{AC_PREPROC_IFELSE},
@code{AC_COMPILE_IFELSE}, @code{AC_LINK_IFELSE}, and
@code{AC_RUN_IFELSE} on one hand and @code{AC_LANG_SOURCES},
@@ -23640,8 +23691,8 @@ have free time again. I think. Yeah, right.)
@node Environment Variable Index
@appendixsec Environment Variable Index
-This is an alphabetical list of the environment variables that Autoconf
-checks.
+This is an alphabetical list of the environment variables that might
+influence Autoconf checks.
@printindex ev
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index 3c05201..c7b0bff 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -274,6 +274,9 @@ shell if you do have one.], [$[]0: ], [], [62])")
fi
SHELL=${CONFIG_SHELL-/bin/sh}
export SHELL
+# Unset more variables known to interfere with behavior of common tools.
+CLICOLOR_FORCE= GREP_OPTIONS=
+unset CLICOLOR_FORCE GREP_OPTIONS
_m4_popdef([AS_EXIT])])# _AS_DETECT_BETTER_SHELL
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