GAWK: Effective AWK Programming

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268 GAWK: Effective AWK Programming‘unsupported/atari/*’Files needed for building gawk on an Atari ST (see Section B.4.1 [Installinggawk on the Atari ST], page 277, for details).‘unsupported/tandem/*’Files needed for building gawk on a Tandem (see Section B.4.3 [Installing gawkon a Tandem], page 279, for details).‘posix/*’‘pc/*’‘vms/*’‘test/*’Files needed for building gawk on POSIX-compliant systems.Files needed for building gawk under MS-DOS, MS Windows and OS/2 (seeSection B.3.1 [Installation on PC Operating Systems], page 270, for details).Files needed for building gawk under VMS (see Section B.3.2 [How to Compileand Install gawk on VMS], page 275, for details).A test suite for gawk. You can use ‘make check’ from the top-level gawk directoryto run your version of gawk against the test suite. If gawk successfullypasses ‘make check’, then you can be confident of a successful port.B.2 Compiling and Installing gawk on UnixUsually, you can compile and install gawk by typing only two commands. However, if youuse an unusual system, you may need to configure gawk for your system yourself.B.2.1 Compiling gawk for UnixAfter you have extracted the gawk distribution, cd to ‘gawk-3.1.8’. Like most GNU software,gawk is configured automatically for your Unix system by running the configureprogram. This program is a Bourne shell script that is generated automatically using GNUautoconf. (The autoconf software is described fully in Autoconf—Generating AutomaticConfiguration Scripts, which is available from the Free Software Foundation.)To configure gawk, simply run configure:sh ./configureThis produces a ‘Makefile’ and ‘config.h’ tailored to your system. The ‘config.h’file describes various facts about your system. You might want to edit the ‘Makefile’ tochange the CFLAGS variable, which controls the command-line options that are passed tothe C compiler (such as optimization levels or compiling for debugging).Alternatively, you can add your own values for most make variables on the commandline, such as CC and CFLAGS, when running configure:CC=cc CFLAGS=-g sh ./configureSee the file ‘INSTALL’ in the gawk distribution for all the details.After you have run configure and possibly edited the ‘Makefile’, type:makeShortly thereafter, you should have an executable version of gawk. That’s all there is to it!To verify that gawk is working properly, run ‘make check’. All of the tests should succeed. Ifthese steps do not work, or if any of the tests fail, check the files in the ‘README_d’ directoryto see if you’ve found a known problem. If the failure is not described there, please send ina bug report (see Section B.5 [Reporting Problems and Bugs], page 280.)
Appendix B: Installing gawk 269B.2.2 Additional Configuration OptionsThere are several additional options you may use on the configure command line whencompiling gawk from scratch, including:--enable-portalsTreat pathnames that begin with ‘/p’ as BSD portal files when doing two-wayI/O with the ‘|&’ operator (see Section 10.4 [Using gawk with BSD Portals],page 173).--enable-switchEnable the recognition and execution of C-style switch statements in awk programs(see Section 6.4.5 [The switch Statement], page 105.)--with-whiny-user-strftimeForce use of the included version of the strftime function for deficient systems--disable-lintThis option disables all lint checking within gawk. The ‘--lint’ and‘--lint-old’ options (see Section 11.2 [Command-Line Options], page 177)are accepted, but silently do nothing. Similarly, setting the LINT variable (seeSection 6.5.1 [Built-in Variables That Control awk], page 110) has no effect onthe running awk program.When used with GCC’s automatic dead-code-elimination, this option cuts almost200K bytes off the size of the gawk executable on GNU/Linux x86 systems.Results on other systems and with other compilers are likely to vary. Using thisoption may bring you some slight performance improvement.Using this option will cause some of the tests in the test suite to fail. Thisoption may be removed at a later date.--disable-nlsDisable all message-translation facilities. This is usually not desirable, but itmay bring you some slight performance improvement.--disable-directories-fatalCauses gawk to silently skip directories named on the command line.As of version 3.1.5, the ‘--with-included-gettext’ configuration option is no longeravailable, since gawk expects the GNU gettext library to be installed as an external library.As of version 3.1.8, the ‘--disable-libsigsegv’ configuration option is no longer available,since gawk expects the GNU libsigsegv library to be installed as an external library.B.2.3 The Configuration ProcessThis section is of interest only if you know something about using the C language and theUnix operating system.The source code for gawk generally attempts to adhere to formal standards whereverpossible. This means that gawk uses library routines that are specified by the ISO Cstandard and by the POSIX operating system interface standard. When using an ISO Ccompiler, function prototypes are used to help improve the compile-time checking.
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