| Port of GNU Make to 32-bit protected mode on MSDOS and MS-Windows. |
| |
| Builds with DJGPP v2 port of GNU C/C++ compiler and utilities. |
| |
| |
| New (since 3.74) DOS-specific features: |
| |
| 1. Supports long filenames when run from DOS box on Windows 9x. |
| |
| 2. Supports both stock DOS COMMAND.COM and Unix-style shells |
| (details in 'Notes' below). |
| |
| 3. Supports DOS drive letters in dependencies and pattern rules. |
| |
| 4. Better support for DOS-style backslashes in pathnames (but see |
| 'Notes' below). |
| |
| 5. The $(shell) built-in can run arbitrary complex commands, |
| including pipes and redirection, even when COMMAND.COM is your |
| shell. |
| |
| 6. Can be built without floating-point code (see below). |
| |
| 7. Supports signals in child programs and restores the original |
| directory if the child was interrupted. |
| |
| 8. Can be built without (a previous version of) Make. |
| |
| 9. The build process requires only standard tools. (Optional |
| targets like "check:" still need additional programs, though, |
| see below.) |
| |
| 10. Beginning with v3.78, the test suite works in the DJGPP |
| environment (requires Perl and auxiliary tools; see below). |
| |
| |
| To install a binary distribution: |
| |
| Simply unzip the makNNNb.zip file (where NNN is the version number) |
| preserving the directory structure (-d switch if you use PKUNZIP). |
| If you are installing Make on Windows 9X or Windows 2000, use an |
| unzip program that supports long filenames in zip files. After |
| unzipping, make sure the directory with make.exe is on your PATH, |
| and that's all you need to use Make. |
| |
| |
| To build from sources: |
| |
| 1. Unzip the archive, preserving the directory structure (-d switch |
| if you use PKUNZIP). If you build Make on Windows 9X or Windows |
| 2000, use an unzip program that supports long filenames in zip |
| files. |
| |
| If you are unpacking an official GNU source distribution, use |
| either DJTAR (which is part of the DJGPP development |
| environment), or the DJGPP port of GNU Tar. |
| |
| 2. If you have a working Make already, you can run: |
| |
| make -f Basic.mk |
| |
| 3. If you don't have a working Make already you can bootstrap one |
| by running: |
| |
| .\builddos.bat |
| |
| 4. If you are building from outside of the source directory, you |
| need to tell Make where the sources are, like this: |
| |
| make -f c:/djgpp/gnu/make/Basic.mk SRCDIR=c:/djgpp/gnu/make |
| |
| or: |
| |
| c:/djgpp/gnu/make/builddos.bat c:/djgpp/gnu/make |
| |
| 5. To run the test suite, type "make check". This requires a Unix |
| shell (I used the DJGPP port of Bash 2.03), Perl, Sed, Fileutils |
| and Sh-utils. |
| |
| 6. To install copy make.exe to the preferred location. |
| |
| Since GNU Make 4.3, support for customized platform installations |
| has been removed. If you'd like to collaborate on reinstating |
| these capabilities, contact bug-make@gnu.org. |
| |
| |
| Notes: |
| ----- |
| |
| 1. The shell issue. |
| |
| This is probably the most significant improvement, first |
| introduced in the port of GNU Make 3.75. |
| |
| The original behavior of GNU Make is to invoke commands |
| directly, as long as they don't include characters special to |
| the shell or internal shell commands, because that is faster. |
| When shell features like redirection or filename wildcards are |
| involved, Make calls the shell. |
| |
| This port supports both DOS shells (the stock COMMAND.COM and its |
| 4DOS/NDOS replacements), and Unix-style shells (tested with the |
| venerable Stewartson's 'ms_sh' 2.3 and the DJGPP port of 'bash' by |
| Daisuke Aoyama <jack@st.rim.or.jp>). |
| |
| When the $SHELL variable points to a Unix-style shell, Make |
| works just like you'd expect on Unix, calling the shell for any |
| command that involves characters special to the shell or |
| internal shell commands. The only difference is that, since |
| there is no standard way to pass command lines longer than the |
| infamous DOS 126-character limit, this port of Make writes the |
| command line to a temporary disk file and then invokes the shell |
| on that file. |
| |
| If $SHELL points to a DOS-style shell, however, Make will not |
| call it automatically, as it does with Unix shells. Stock |
| COMMAND.COM is too dumb and would unnecessarily limit the |
| functionality of Make. For example, you would not be able to |
| use long command lines in commands that use redirection or |
| pipes. Therefore, when presented with a DOS shell, this port of |
| Make will emulate most of the shell functionality, like |
| redirection and pipes, and shall only call the shell when a |
| batch file or a command internal to the shell is invoked. (Even |
| when a command is an internal shell command, Make will first |
| search the $PATH for it, so that if a Makefile calls 'mkdir', |
| you can install, say, a port of GNU 'mkdir' and have it called |
| in that case.) |
| |
| The key to all this is the extended functionality of 'spawn' and |
| 'system' functions from the DJGPP library; this port just calls |
| 'system' where it would invoke the shell on Unix. The most |
| important aspect of these functions is that they use a special |
| mechanism to pass long (up to 16KB) command lines to DJGPP |
| programs. In addition, 'system' emulates some internal |
| commands, like 'cd' (so that you can now use forward slashes |
| with it, and can also change the drive if the directory is on |
| another drive). Another aspect worth mentioning is that you can |
| call Unix shell scripts directly, provided that the shell whose |
| name is mentioned on the first line of the script is installed |
| anywhere along the $PATH. It is impossible to tell here |
| everything about these functions; refer to the DJGPP library |
| reference for more details. |
| |
| The $(shell) built-in is implemented in this port by calling |
| 'popen'. Since 'popen' calls 'system', the above considerations |
| are valid for $(shell) as well. In particular, you can put |
| arbitrary complex commands, including pipes and redirection, |
| inside $(shell), which is in many cases a valid substitute for |
| the Unix-style command substitution (`command`) feature. |
| |
| |
| 2. "SHELL=/bin/sh" -- or is it? |
| |
| Many Unix Makefiles include a line which sets the SHELL, for |
| those versions of Make which don't have this as the default. |
| Since many DOS systems don't have 'sh' installed (in fact, most |
| of them don't even have a '/bin' directory), this port takes |
| such directives with a grain of salt. It will only honor such a |
| directive if the basename of the shell name (like 'sh' in the |
| above example) can indeed be found in the directory that is |
| mentioned in the SHELL= line ('/bin' in the above example), or |
| in the current working directory, or anywhere on the $PATH (in |
| that order). If the basename doesn't include a filename |
| extension, Make will look for any known extension that indicates |
| an executable file (.exe, .com, .bat, .btm, .sh, and even .sed |
| and .pl). If any such file is found, then $SHELL will be |
| defined to the exact pathname of that file, and that shell will |
| hence be used for the rest of processing. But if the named |
| shell is *not* found, the line which sets it will be effectively |
| ignored, leaving the value of $SHELL as it was before. Since a |
| lot of decisions that this port makes depend on the gender of |
| the shell, I feel it doesn't make any sense to tailor Make's |
| behavior to a shell which is nowhere to be found. |
| |
| Note that the above special handling of "SHELL=" only happens |
| for Makefiles; if you set $SHELL in the environment or on the |
| Make command line, you are expected to give the complete |
| pathname of the shell, including the filename extension. |
| |
| The default value of $SHELL is computed as on Unix (see the Make |
| manual for details), except that if $SHELL is not defined in the |
| environment, $COMSPEC is used. Also, if an environment variable |
| named $MAKESHELL is defined, it takes precedence over both |
| $COMSPEC and $SHELL. Note that, unlike Unix, $SHELL in the |
| environment *is* used to set the shell (since on MSDOS, it's |
| unlikely that the interactive shell will not be suitable for |
| Makefile processing). |
| |
| The bottom line is that you can now write Makefiles where some |
| of the targets require a real (i.e. Unix-like) shell, which will |
| nevertheless work when such shell is not available (provided, of |
| course, that the commands which should always work, don't |
| require such a shell). More important, you can convert Unix |
| Makefiles to MSDOS and leave the line which sets the shell |
| intact, so that people who do have Unixy shell could use it for |
| targets which aren't converted to DOS (like 'install' and |
| 'uninstall', for example). |
| |
| |
| 3. Default directories. |
| |
| GNU Make knows about standard directories where it searches for |
| library and include files mentioned in the Makefile. Since |
| MSDOS machines don't have standard places for these, this port |
| will search ${DJDIR}/lib and ${DJDIR}/include respectively. |
| $DJDIR is defined automatically by the DJGPP startup code as the |
| root of the DJGPP installation tree (unless you've tampered with |
| the DJGPP.ENV file). This should provide reasonable default |
| values, unless you moved parts of DJGPP to other directories. |
| |
| |
| 4. Letter-case in filenames. |
| |
| If you run Make on Windows 9x, you should be aware of the |
| letter-case issue. Make is internally case-sensitive, but all |
| file operations are case-insensitive on Windows 9x, so |
| e.g. files 'FAQ', 'faq' and 'Faq' all refer to the same file, as |
| far as Windows is concerned. The underlying DJGPP C library |
| functions honor the letter-case of the filenames they get from |
| the OS, except that by default, they down-case 8+3 DOS filenames |
| which are stored in upper case in the directory and would break |
| many Makefiles otherwise. (The details of which filenames are |
| converted to lower case are explained in the DJGPP libc docs, |
| under the '_preserve_fncase' and '_lfn_gen_short_fname' |
| functions, but as a thumb rule, any filename that is stored in |
| upper case in the directory, is a valid DOS 8+3 filename and |
| doesn't include characters invalid on MSDOS FAT filesystems, |
| will be automatically down-cased.) User reports that I have |
| indicate that this default behavior is generally what you'd |
| expect; however, your input is most welcome. |
| |
| In any case, if you hit a situation where you must force Make to |
| get the 8+3 DOS filenames in upper case, set FNCASE=y in the |
| environment or in the Makefile. |
| |
| |
| 5. DOS-style pathnames. |
| |
| There are a lot of places throughout the program sources which |
| make implicit assumptions about the pathname syntax. In |
| particular, the directories are assumed to be separated by '/', |
| and any pathname which doesn't begin with a '/' is assumed to be |
| relative to the current directory. This port attempts to |
| support DOS-style pathnames which might include the drive letter |
| and use backslashes instead of forward slashes. However, this |
| support is not complete; I feel that pursuing this support too |
| far might break some more important features, particularly if |
| you use a Unix-style shell (where a backslash is a quote |
| character). I only consider support of backslashes desirable |
| because some Makefiles invoke non-DJGPP programs which don't |
| understand forward slashes. A notable example of such programs |
| is the standard programs which come with MSDOS. Otherwise, you |
| are advised to stay away from backslashes whenever possible. In |
| particular, filename globbing won't work on pathnames with |
| backslashes, because the GNU 'glob' library doesn't support them |
| (backslash is special in filename wildcards, and I didn't want |
| to break that). |
| |
| One feature which *does* work with backslashes is the filename- |
| related built-in functions such as $(dir), $(notdir), etc. |
| Drive letters in pathnames are also fully supported. |
| |
| |
| |
| Bug reports: |
| ----------- |
| |
| Bugs that are clearly related to the MSDOS/DJGPP port should be |
| reported first on the comp.os.msdos.djgpp news group (if you cannot |
| post to Usenet groups, write to the DJGPP mailing list, |
| <djgpp@delorie.com>, which is an email gateway into the above news |
| group). For other bugs, please follow the procedure explained in |
| the "Bugs" chapter of the Info docs. If you don't have an Info |
| reader, look up that chapter in the 'make.i1' file with any text |
| browser/editor. |
| |
| |
| Enjoy, |
| Eli Zaretskii <eliz@is.elta.co.il> |
| |
| |
| ------------------------------------------------------------------------------- |
| Copyright (C) 1996-2024 Free Software Foundation, Inc. |
| This file is part of GNU Make. |
| |
| GNU Make 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 3 of the License, or (at your option) any later |
| version. |
| |
| GNU Make 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 <https://www.gnu.org/licenses/>. |
