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; * msdos/INSTALL: Add info about GCC versions.

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Eli Zaretskii 2018-05-04 18:12:32 +03:00
parent 7ddcc9ab1a
commit 91a68b5f61
1 changed files with 12 additions and 3 deletions
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15
msdos/INSTALL
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@ -19,6 +19,15 @@ the necessary utilities; search for "MS-DOS". The configuration step
(see below) will test for these utilities and will refuse to continue (see below) will test for these utilities and will refuse to continue
if any of them isn't found. if any of them isn't found.
You should carefully choose the version of GCC you use to build Emacs,
because recent versions of GCC don't support building Emacs very well.
The main issue is the debug info: the DJGPP build of Emacs must use
the COFF debug info. GCC support for COFF debug info was steadily
deteriorating since GCC 5, and GCC 8.1 officially stopped supporting
the -gcoff switch, which the Emacs build process needs. We recommend
using GCC 3.4.X and Binutils 2.26; GDB 7.2 is capable to debug an
Emacs binary built by this combination.
Bootstrapping Emacs or recompiling Lisp files in the `lisp' Bootstrapping Emacs or recompiling Lisp files in the `lisp'
subdirectory using the various targets in the lisp/Makefile file subdirectory using the various targets in the lisp/Makefile file
requires additional utilities: `find' (from Findutils), GNU `echo' and requires additional utilities: `find' (from Findutils), GNU `echo' and
@ -70,15 +79,15 @@ Running "config msdos" checks for several programs that are required
to configure and build Emacs; if one of those programs is not found, to configure and build Emacs; if one of those programs is not found,
CONFIG.BAT stops and prints an error message. CONFIG.BAT stops and prints an error message.
On Windows NT and Windows 2000/XP/Vista/7, running "config msdos" On Windows NT and Windows 2000/XP and later, running "config msdos"
might print an error message like "VDM has been already loaded". This might print an error message like "VDM has been already loaded". This
is because those systems have a program called `redir.exe' which is is because those systems have a program called `redir.exe' which is
incompatible with a program by the same name supplied with DJGPP, incompatible with a program by the same name supplied with DJGPP,
which is used by config.bat. To resolve this, move the DJGPP's `bin' which is used by config.bat. To resolve this, move the DJGPP's `bin'
subdirectory to the front of your PATH environment variable. subdirectory to the front of your PATH environment variable.
Windows Vista/7 has several bugs in its DPMI server related to memory Windows Vista and later has several bugs in its DPMI server related to
allocation: it fails DPMI resize memory block function, and it memory allocation: it fails DPMI resize memory block function, and it
arbitrarily limits the default amount of DPMI memory to 32MB. To work arbitrarily limits the default amount of DPMI memory to 32MB. To work
around these bugs, first configure Emacs to use the `malloc' function around these bugs, first configure Emacs to use the `malloc' function
from the DJGPP library. To this end, run CONFIG.BAT with the from the DJGPP library. To this end, run CONFIG.BAT with the