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Top Forums UNIX for Dummies Questions & Answers ./configure backslash questions Post 302311376 by RobertSubnet on Tuesday 28th of April 2009 01:06:47 PM
Old 04-28-2009
./configure backslash questions

Hello all. I am going to try my hand at compiling tarballs rather than installing packages.

I have a pretty good understanding of the process and have even compiled/installed Top from source.

But that was an easy install, I want to try something more complex using the various configure flags.

From what I have read, you can specify a number of options with the flags. From my reading, I often see a flag followed by a backslash ("\").

What I am wondering, are there any special rules with regards to the use of these backslashes? IE: single space after the flag and then the backslash? Does the flag denote a return? Is there no backslash used after the last flag in the list?

While on the subject of ./configure, what of the single quotes, are they necessary? I don't see them used too often.

Below is a sample ./configure I got from the MySQL site to demonstrate what I mean:

./configure \
'--prefix=/usr/local/mysql' \
'--disable-dependency-tracking' \
'--enable-assembler' \
'--localstatedir=/usr/local/mysql/data' \
'--libexecdir=/usr/local/mysql/bin' \
'--libdir=/usr/local/mysql/lib' \
'--enable-local-infile' \
'--enable-shared' \
'--enable-thread-safe-client' \
'--with-archive-storage-engine' \
'--with-big-tables' \
'--with-comment=MySQL Community Server (GPL)' \
'--with-extra-charsets=complex' \
'--with-innodb' \
'--with-mysqld-ldflags=-all-static' \
'--with-readline' \
'--with-server-suffix=-standard' \
'--with-unix-socket-path=/tmp/mysql.sock' \
'--with-zlib-dir=bundled' \
'--without-debug' \
'--without-docs' \
'--without-man'

Also why the \ immediately after the ./configure? Rather than say:
./configure --prefix=/usr/local/mysql \
<rest of the text>

is that just to make it neat for the web page and perfectly valid code?

Thank you for your comments.
~Robert
 

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MYSQL_CONFIG(1) 					       MySQL Database System						   MYSQL_CONFIG(1)

NAME
mysql_config - get compile options for compiling clients SYNOPSIS
mysql_config options DESCRIPTION
mysql_config provides you with useful information for compiling your MySQL client and connecting it to MySQL. mysql_config supports the following options. o --cflags Compiler flags to find include files and critical compiler flags and defines used when compiling the libmysqlclient library. The options returned are tied to the specific compiler that was used when the library was created and might clash with the settings for your own compiler. Use --include for more portable options that contain only include paths. o --include Compiler options to find MySQL include files. o --libmysqld-libs, --embedded Libraries and options required to link with the MySQL embedded server. o --libs Libraries and options required to link with the MySQL client library. o --libs_r Libraries and options required to link with the thread-safe MySQL client library. o --plugindir The default plugin directory path name, defined when configuring MySQL. This option was added in MySQL 5.1.24. o --port The default TCP/IP port number, defined when configuring MySQL. o --socket The default Unix socket file, defined when configuring MySQL. o --variable=VAR Path to MySQL include, library and plugin directories. VAR is one of `pkgincludedir`, `pkglibdir` and `plugindir`, respectively. o --version Version number for the MySQL distribution. If you invoke mysql_config with no options, it displays a list of all options that it supports, and their values: shell> mysql_config Usage: /usr/local/mysql/bin/mysql_config [options] Options: --cflags [-I/usr/local/mysql/include/mysql -mcpu=pentiumpro] --include [-I/usr/local/mysql/include/mysql] --libs [-L/usr/local/mysql/lib/mysql -lmysqlclient -lz -lcrypt -lnsl -lm -L/usr/lib -lssl -lcrypto] --libs_r [-L/usr/local/mysql/lib/mysql -lmysqlclient_r -lpthread -lz -lcrypt -lnsl -lm -lpthread] --socket [/tmp/mysql.sock] --port [3306] --version [4.0.16] --libmysqld-libs [-L/usr/local/mysql/lib/mysql -lmysqld -lpthread -lz -lcrypt -lnsl -lm -lpthread -lrt] You can use mysql_config within a command line to include the value that it displays for a particular option. For example, to compile a MySQL client program, use mysql_config as follows: shell> CFG=/usr/local/mysql/bin/mysql_config shell> sh -c "gcc -o progname `$CFG --include` progname.c `$CFG --libs`" When you use mysql_config this way, be sure to invoke it within backtick ("`") characters. That tells the shell to execute it and substitute its output into the surrounding command. COPYRIGHT
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc. This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This documentation 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 the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/. SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/. AUTHOR
Sun Microsystems, Inc. (http://www.mysql.com/). MySQL 5.1 04/06/2010 MYSQL_CONFIG(1)
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