The C Users' Group Library 1994 August

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This is the README file for DJ's GCC port to DOS ("djgpp") Contents: * Overview * What's available * How to install * Common questions * Deviations and Caveats * Copyright information Disclaimer: This software is distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. DJ Delorie USmail: 24 Kirsten Ave, Rochester, NH 03867-2954, USA email: dj@ctron.com Overview: This package contains a 32-bit 80386 DOS extender with symbolic debugger, a C/C++ compiler with utilities, development libraries, and source code. It generates full 32-bit programs and supports full virtual memory with paging to disk. Requirements: A 80386-based IBM compatible PC or PS/2, approximately 4-5Mb of hard drive space, and 512K RAM. Supported Wares: * Up to 128M of extended memory (expanded under VCPI) * Up to 128M of disk space used for swapping * SuperVGA 256-color mode up to 1024x768 * 80387 * XMS & VDISK memory allocation strategies * VCPI programs, such as QEMM and 386MAX Unsupported: * DPMI programs, such as Windows 3.0 * Multiprocessing (fork()) File location: host: grape.ecs.clarkson.edu login: ftp password: send your e-mail address directory: ~ftp/pub/msdos/djgpp Many thanks to the sysops at Clarkson for providing a home to djgpp! As a convenience to non-FTP users, djgpp is also stored on Clarkson's archive server, sun.soe.clarkson.edu. To access the archive server, do this: % mail archive-server@sun.soe.clarkson.edu Subject: <none> help index msdos/djgpp ^D NOTE: In accordance with FSF CopyLeft, you are not allowed to upload this program to a distribution site unless that site also makes the FSF sources for these programs available. Please read the file COPYING for more details. FSF sources are available on prep.ai.mit.edu, and on either grape.ecs.clarkson.edu or sun.soe.clarkson.edu NOTE: If your application links in object modules that were written by FSF, your application counts as a "derived work" and must obey the provisions of the FSF Copyrights. See the file COPYING for details. Specifically, the C++ classes in libc.a and obstacks are FSF works that are covered by the GNU GPL. The mere act of compiling does not affect the copyright status of your program. File formats: .ZIP format - djgpp.zip - one 2.2M file, contains everything. split .ZIP - djgppzip.000 through djgppzip.005 (or so), each 320K-ish. Use the merge program to merge them into djgpp.zip ("merge djgppzip djgpp.zip"). other - readme, merge.c/.exe, split.c/.exe are separately available Directories: bin all binaries (cpp, cc1, extender, etc) lib all libraries (crt0.*, libc.a, libgr.a, libpc.a) include all include files docs all documents (including this one) go32 sources for the extender drivers various SuperVGA drivers libsrc sources for the libraries diffs diffs from FSF distributions to dos-compilable utils sources for the utilities samples sample C++ sources using graphics & mouse emu387 80387 emulator for non-80387 systems bin: bison.exe lalr(1) parser flex.exe lexical parser cpp.exe C and C++ preprocessor cc1.exe C compiler cc1plus.exe C++ compiler as.exe 80386/80387 assembler ld.exe a.out (BSD) format linker ar.exe archive utility nm.exe name list utility size.exe a.out section size utility strip.exe symbol stripper objdump.exe display info from .o file gcc.exe compilation coordinator go32.exe basic 32-bit DOS extender debug32.exe 32-bit DOS extender with symbolic debugger stub.exe stub to prepend on aout files to make .exe files aout2exe.bat turns aout file to .exe by prepending stub.exe diff.exe creates diffs, including context diffs patch.exe patches source from diffs, including context diffs djtarx.exe tar extractor for FSF tarfiles if you don't have a tar utod.exe convert Unix text files to DOS text files dtou.exe convert DOS text files to Unix text files split.exe split big binaries into many little binaries merge.exe merge many little binaries back into one big binary gprof.exe profile report generator lib: libc.a all standard routines (BSD style), and C++ methods & support libm.a math routines libgr.a graphics routines and mouse support libpc.a routines for PC support (in/out, getkey, kbhit, screen utils) *_p.a profiled libraries crt0.s C runtime source crt0.o C runtime object bison.simple bison support bison.hairy bison support flex.skel flex support file libflex.a flex support library include: Most BSD-style and SYSV-style include files. These mostly came from the G++ sources. sys/*.h MS-DOS specific graphics.h for libgr.a pc.h for libpc.a mouse.h for mouse routines in libgr.a docs: readme this document copying GNU General Public License copying.dj Copyright information for items (C) DJ Delorie debug32.doc instructions for the symbolic debugger internal.doc information about how the extender works libc.doc differences and enhancements libm.doc list of implemented functions libpc.doc documentation libgr.doc documentation go32: sources for the extender. Requires Turbo C and Turbo Assembler drivers: VGA and SuperVGA drivers - source and binary. Use the GO32 environment variable to select and configure one of these according to the VGA card you have. libsrc: Sources for the libraries. These are compiled with gcc. The makefile is set up for NDMAKE. The source files came from three sources: (1) Me. Mostly the system call routines, and some string routines. All of libpc.a, libgr.a, libm.a . (2) FSF. These are the GCC support routines, C++ support, and other routines that came with gcc (malloc, obstack, alloca, etc) (3) BSD. These are mostly the stdio and stdlib routines, and the rest of the string routines. BSD requires that I mention that their sources are copyright BSD and that I have modified some to comply with the include files provided by FSF. These sources are the "freed files" everyone keeps talking about. diffs: Context diffs from the original FSF sources to the GNUDOS sources. See the README and VERSIONS files in that directory for more info. utils: Sources for djtarx, utod, dtou, split, and merge. samples: Various samples showing how to use the mouse, graphics, C++, setjmp(), etc. emu387: 80387 emulator and source code. I don't expect this to work perfectly, but should cover most normal floating point math. To use, add "emu /djgpp/emu387/emu387" to the GO32 environment variable. (ie: set GO32=emu /djgpp/emu387/emu387) INSTALLING: To install, you must do the following: * Create a directory to install in, like c:\djgpp. * Create a "temp" directory, like c:\tmp. * Un-zip djgpp.zip in that directory. C:\DJGPP> pkunzip -d djgpp.zip * Add the following lines to C:\AUTOEXEC.BAT: set GCCBIN=c:\djgpp\bin ^ Use DOS slashes here so that AOUT2EXE.BAT will work set GCCINC=c:/djgpp/include set GCCLIB=c:/djgpp/lib set GCCTMP=c:/tmp set GO32TMP=c:/tmp set GO32=ansi driver c:/djgpp/drivers/SOMETHING.grd gw 1024 gh 768 ^^^ whatever driver works with your VGA (optional) set BISON_SIMPLE=c:/djgpp/lib/bison.simple set BISON_HAIRY=c:/djgpp/lib/bison.hairy set FLEX_SKELETON=c:/djgpp/lib/flex.skeleton TMP and TEMP are checked if GCCTMP isn't set GO32TMP is where go32 puts its paging file (GCCTMP, TMP, TEMP are checked, in that order, also) Remember that unless you manually type these at the command line, they won't take effect until you reboot. Don't include the "ansi" keyword in the "go32" variable if you don't have an ANSI.SYS driver or equivalent. * Add your binaries directory to your PATH in C:\AUTOEXEC.BAT SET PATH= . . . ;C:\DJGPP\BIN That's it! G++ is now installed on your system. The GO32 environment variable: This variable controls the options available in go32 or debug32. The syntax of this variable is: SET GO32=[parm [value]] [parm [value]] . . . Parameters: ansi Use ANSI commands to control the color in debug32 mono Use the Monochrome monitor for debugging - useful when debugging graphics applications 1rm Redirect stdout (file #1) to the monochrome monitor 2rm Redirect stderr (file #2) to the monochrome monitor 1r2 Redirect stdout (file #1) to stderr (file #2) 2r1 Redirect stderr (file #2) to stdout (file #1) emu [path] Use the specified file as the 80387 emulator driver [path] Use the specified file as the graphics driver gw [width] Default graphics width gh [height] Default graphics height tw [width] Default text width th [height] Default text height These parameters may occur in any order. Note that "1rm" and "2rm" are done before "1r2" and "2r1", so "1rm 2r1" sends stdout to the mono monitor and stderr to any redirection used. Examples: C:\> set GO32=mono driver c:\djgpp\drivers\tseng4k.grd gw 1024 gh 768 tw 132 th 43 C:\> set GO32=ansi C:\> set GO32=driver c:\djgpp\drivers\tseng4k.grd ansi C:\> set GO32=mono 1rm 2rm Common Questions: Q: When I run "gcc e:\proj\prog.c" it says "undefined escape sequence \p"? A: Gcc is a *unix* compiler - you must use *unix* slashes (e:/proj/prog.c). Environment variables (like GCCINC) may, however, use either, as they are converted. Q: I type "GCC PROG.C" and ld complains about PROG.C not being an object. Q: I type "gcc prog.cxx" to compile a C++ program, and ld complains. A: Gcc is *not* case insensitive like DOS is, and it uses the file's extension to determine how to compile a file. Valid extensions are: .cc = C++ source (passed through cpp) .c = C source that must be passed through cpp first .i = raw C source (no cpp pass) .S = assembler that must be passed through cpp first .s = raw assembler source (no cpp pass) any other file is passed to the linker Q: I compile my program, but can't run the output file. A: DOS doesn't know how to run unix-style a.out files. That's what the extender is for. To run an a.out file called myprog, type "go32 myprog . . ." Q: Gcc doesn't recognize // as a comment in my C programs. A: That's because // isn't a comment in C. If you want to compile C++, then write C++ programs. Gcc is really two compilers in one, not one compiler that compiles both C and C++. That's why you get cc1 and cc1plus. Q: I'm reading in data files, but the data gets corrupted. A: The default file type is DOS text, even for read() and write(). You must tell the system that a file is binary through the "b" flag in fopen(), or O_BINARY in open(). Q: I get "fatal signal 2" when I run gcc. A: When gcc reports a "signal", it really means that an error occurred trying to run the given program. The "signal" number is the DOS error code, and 2 means "file not found". Check the GCCBIN environment variable and make sure it points to the directory with cpp.exe, cc1.exe, etc. Q: The binaries I get with the distribution are .exe files, but gcc creates a.out files. I rename the a.out's to .EXE's, but they still don't work. A: To get an .EXE from an a.out, you must *prepend* either go32.exe, debug32.exe, or stub.exe to the file: copy /b stub.exe+myprog myprog.exe Q: What is stub.exe? A: Stub.exe simply calles go32.exe, and passes it information it needs to run the a.out file attached to it. Stub is much smaller than go32, so less disk space is used. Also, if you change go32, you don't have to change stub, and all the stub-ized programs will use the new go32 automatically. Q: I want to change cc1. How do I do this? A: First, get the GNU sources from FSF. They're usually available at prep.ai.mit.edu in /u/emacs, if not elsewhere. Use djtarx to un-tar them, as djtarx knows how to handle unix file names that aren't valid DOS file names. Look in the "diffs" sources to see what to change the names to when they conflict. Next, apply the "diffs" over the GNU sources (making sure you have the right version of GNU - see the versions file). For the gcc-1.39 sources, you must run utod (or some other unix-to-dos converter) to compile gcc.exe, then run config-d.bat, then run makeall.bat. For gpp-1.39, copy the g++ sources over the completed gcc sources, apply the gpp diffs, then run makeall.bat (gpp's now). For all other programs, just run make. Note that the makefiles are tuned for ndmake, since it knows how to make response files. Specific instructions are documented in the diffs directory. Q: I don't have an 80387. How do I compile floating point programs? A: Add "emu c:\djgpp\emu387\emu387" to the GO32 environment variable (see go32 section above). This tells go32 to use the given file as an 80387 emulator. If you don't load this emulator, and you try to run floating point without a 387, you will get an error. Q: I installed an 80387 emulator in my AUTOEXEC, but it still doesn't work. Why? A: The CPU is running in *protected* mode, not real mode, and the information needed to emulate the 80387 is different. Not to mention that the exceptions never get to the real-mode handler. You must use the emu387 emulator, which is designed for go32. Q: I can't run a.out programs under Windows. A: Nope, you can't. Go32 only supports VCPI, and Windows provides DPMI 0.9, which isn't enough for Go32 to work correctly. Q: Can I run this on my 286? It has protected mode also... A: True, but the 286 isn't a 32-bit processor. A 386 really is required. Q: Can I use gcc on my 512K machine? A: Yes, but the disk better have at least 4Mb of free space for paging. Go32 will use all available extended memory (up to 128M) and up to 128M of disk space, for a grand total of 256M of virtual memory for your application. Try a malloc(50*1024*1024) some day. Q: Why do my compiles are running VERY SLOW, even though I use a ramdisk for swap and a disk cache? A: Gcc requires at least 1Mb of virtual memory to run, usually close to 1.5M. If there isn't this much real memory available, it starts paging to disk. It's good to leave about 1M of extended (not expanded) memory available for go32 to run programs with. When it needs to page a lot, you spend most of your time paging and little time actually running. Note that if you are running with a VCPI server, like QEMM or 386MAX, then go32 will use *expanded* memory for it's physical memory needs, not extended. Q: How much memory is available when I use the system() call? A: Everything but what go32 is loaded with. The program is completely paged out to memory (including the page tables themselves) before the second program is executed. Currently, this is about 100K less than was available before go32 was executed. Deviations and Caveats: GCC/G++ deviates from the U**x version in a number of ways, mostly to accomodate deficiencies in the MS-DOS environment, and my own laziness. * An 80387 is required to do floating point. An emulator is provided. cc1 and cc1plus shouldn't use the 387 unless compiling floating point code. The environment variable "387" can override the auto-detection routine: SET 387=YES to force 387 handlers to be enabled SET 387=NO to force 387 accesses to fault SET 387=QUERY to get a message showing the results of the auto-detection If no 80387 is present and the program attempts to use it, a message indicating where the instruction is will be displayed. To use the 387 emulator, add "emu c:\djgpp\emu387\emu387" to the GO32 environment variable. Specifying use of the emulator overrides the "387" environment variable. * The VDISK method of allocating extended memory is supported. The INT 15h method is also. When the extender runs out of conventional and extended memory, it uses a paging file named $(GCCTMP)/pageXXXX.386, where XXXX is an unspecified hex value. This file is normally removed on exit. * Up to 128 MB of physical memory and 128 MB of disk swap space are allowed. A 512K machine is sufficient, but very slow due to paging. * The utilies support the MS-DOS standard response file method for giving more than 128 bytes of command line. Example: "gcc -o foo @foo.lnk" where foo.lnk contains a list of .o files. * Since MS-DOS does not distinguish case in file names, some .h files used for C++ have had underscores prepended to them to avoid conflict (ie: String.h conflicts with string.h, so it became _String.h). * When using ar to create archives, be warned that the ar version supplied cannot update an archive that's been sequenced (ar s foo.a), and cannot sequence a file that's been sequenced. Also, ld cannot use an archive that's not sequenced. The following method is suggested: ar rv mylib.a $(OBJS) cp mylib.a mylib2.a ar rvs mylib2.a (and then link with mylib2.a) * The extender can be added to any gcc-compiled program by copying go32.exe to be <program>.exe, where <program> is the 32-bit program. For example, if "hello" is a gcc-compiled a.out file, and "hello.exe" is a copy of go32.exe, then when "hello.exe" runs, it loads the file called "hello" in the same directory, and executes it if present. Otherwise, the first parameter is the executable (ie: go32 cc1plus foo.cc). * The extender can be merged to create one .exe file that is the extender and the executable in one file, by using the stub.exe program: copy /b stub.exe+myprog myprog.exe This will only work if go32.exe is in your search path, because stub.exe runs it. Alternatively, you can prepend go32.exe itself to an a.out file to get a single executable (stub.exe is much smaller). Note that if you re-compile go32 or stub, you must strip off the symbol table first. * The extender runs programs at logical address 0. A copy of the first 1 MB of physical memory (including the AT channel) is mapped to 0xE0000000 in the program's address space. The stack grows down from 0x7FFFFFFC in the program's address space. Data usually starts at 0x00400000. * The paging mechanism understands how SuperVGA's map their memory onto the AT bus and automatically swaps pages as the program tries to access them. The program sees a linear range from 0xD0000000 to 0xD0100000 that corresponds to each pixel in the 256-color modes of SuperVGAs. To use this feature, you'll have to set the GO32 environment variable like this: C>set go32=driver c:\djgpp\drivers\tseng4k.grd gw 640 gh 480 tw 132 th 43 These parameter pairs can be omitted or rearranged as needed. They are the "driver" name, default graphics width and height, and default text width and height. Libgr.a doesn't have to be recompiled, nor do graphics programs, when a different graphics mode is selected (the extender handles it). It is strongly recommended that the program use the GR_default_graphics and GR_default_text modes to switch to graphics or text. These modes use the parameters specified by the GO32 environment variable, allowing the user to select a favorite graphics and text mode. * Symbols are stored in virtual memory, so you won't run out of symbol space until both extended memory and the disk are all used up. For large programs, you might notice a slight delay while it looks up symbols. Programs with a lot of lines in a given module may run out of memory as the line number table is built in real memory and transferred to virtual memory. * Signals are not reported to the program. However, interrupts do continue to get serviced while in protected mode (ie: keypress, timer, etc). CTRL-C will get you back to the debugger in debug32, and you can continue from where you stopped. All signals (ie: exceptions) cause debugging traps in debug32, or general faults in go32. Copyright Information: * Source code for the GNU utilities is copyright (c) Free Software Foundation. For more information on the FSF copyright, see their source code or write Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. A copy of their file "COPYING" is included in the docs directory. Some of the FSF source code has been modified to operate properly in the MS-DOS environment. * Source code for most of libc.a are copyright (c) Regents of the University of California. These files include copyright information in them. The utilities are compiled against these libraries, and thus contain software developed by the University of California, Berkeley, and its contributors. Some of the BSD source code has been modified to operate properly in the MS-DOS environment. * Any sources not falling under the copyrights of FSF or UCB (as above) are Copyright (c) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954. To contact me via E-Mail, sent to "dj@ctron.com". Cabletron Systems Inc is in no way involved with this project; I just happen to work for them during the day. Terms and Conditions: * Source code copyright FSF is distributed under the terms of the GNU Public General License. See the file "COPYING" in doc.arc for more information. If your program links in object modules (in libc.a) that are compiled from GNU sources, then your entire program must be distributed under the terms of the GNU GPL as a "derived work". These modules are the C++ class library (including the streams classes) and obstacks. The sources in libsrc have the copyright notices in them for the various modules. * Source code copyright UCB is distributed under the terms listed in the UCB source code itself. * Source code copyright DJ Delorie is distributed under the terms of the GNU General Public Licence, with the following exceptions: ("go32.exe" refers to go32.exe and debug32.exe) * There are no conditions on distributing copies of stub.exe as it is originally distributed in this software package. * If a user creates an application, prepends a copy of go32.exe onto the beginning of it, and distributes it free of charge, then the user is under no obligations to distribute source or pay royalties. Note that the copyright terms of the FSF and/or UCB must be obeyed regardless of this. * If a user creates an application, prepends a copy of go32.exe onto the beginning of it, and charges a fee for the software, then a royalty of $5 or 5% of the selling price per copy sold must be paid to DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954. Note that shareware programs are not considered "sold" until payment is rendered for them. * For all other cases, source code for go32.exe must be distributed with any distributed copies of go32.exe. * Software that requires go32.exe to run, but is not distributed with a copy of go32.exe, incurs no obligations with regards to the above sections. * Contact me for special terms if none of the above are suitable. * Donations are always appreciated. The intent of this copyright is this: If you make money by using the programs I wrote, I get some of it. If you use your sources to teach others how to write programs, I'll support you. Changes to source code copyright BSD or FSF are copyright DJ Delorie, but fall under the terms of the original copyright. Donations may be made to any of the following: DJ Delorie 24 Kirsten Ave Rochester, NH 03867-2954 USA Free Software Foundation 675 Mass Ave Cambridge, MA 02139 USA University of California Berkeley, CA (sorry, I don't know their ZIP code) USA