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From: Andris Pavenis <pavenis AT latnet DOT lv>
To: John Fremlin <chief AT bandits DOT org>, <crossgcc AT gcc DOT gnu DOT org>
Subject: Re: i586-pc-linux-gnu to DJGPP cross compiler with today's 3.00 CVS
Date: Mon, 12 Mar 2001 12:42:30 +0200
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Cc: djgpp-workers AT delorie DOT com
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On Monday 12 March 2001 00:44, John Fremlin wrote:
> I set up a cross compiler from i586-pc-linux-gnu to i386-pc-msdosdjgpp
> using the GCC CVS (-r gcc-3_0-branch) of today. There was quite a bit
> of hassle and some problems with C++ remain.
>
> Linking fails on cpp0 because target_flags (used by SUPPORTS_ONE_ONLY
> macro defined in the djgpp.h config file which is instantiated in
> cppinit.c) is defined in rtlanal.c which is not included in the
> link. This can be fixed by also defining target_flags in cppinit.c,
> though that probably isn't the right, as, as far as I can see, they
> are not modified anywhere.
>
> The gcc libiberty/getcwd.c bombed out because of undefined
> PATH_MAX. This can be fixed by #including "limits.h" (careful: with
> <limits.h> the GCC version is included instead of the DJGPP version)
> in the unistd.h. I got the headers from from djcxr203.zip.
>
> I don't have any POSIX drafts so I can't say who's at fault ;-)
>
> Anyway, once I got over these hassles, I managed to produce some
> working executables so things aren't badly broekn.

Tried the same and run into the trouble with building libstdc++-v3:
	
I got 4 incorrect symlinks in i586-pc-msdosdjgpp/libstdc++-v3/include/bits to 
files in libstdc++-v3/include/config/os/newlib/bits instead of 
ones in libstdc++-v3/include/config/djgpp/bits

/disk2/cvs/egcs-curr/build/build.djg/i586-pc-msdosdjgpp/libstdc++-v3/include/bits
total 80
lrwxrwxrwx   1 andris   users          64 Mar 12 10:58 atomicity.h -> ../../../../../gcc/libstdc++-v3/config/cpu/i486/bits/atomicity.h
lrwxrwxrwx   1 andris   users          57 Mar 12 10:58 basic_file_model.h -> ../../../../../gcc/libstdc++-v3/config/basic_file_stdio.h
-rw-r--r--   1 andris   users       26533 Mar 12 10:58 c++config.h
lrwxrwxrwx   1 andris   users          51 Mar 12 10:58 c++io.h -> ../../../../../gcc/libstdc++-v3/config/c_io_stdio.h
lrwxrwxrwx   1 andris   users          57 Mar 12 10:58 c++locale.h -> ../../../../../gcc/libstdc++-v3/config/c_locale_generic.h
lrwxrwxrwx   1 andris   users          51 Mar 12 10:58 c++threads.h -> ../../../../../gcc/libstdc++-v3/config/threads-no.h
lrwxrwxrwx   1 andris   users          66 Mar 12 10:58 ctype_base.h -> ../../../../../gcc/libstdc++-v3/config/os/newlib/bits/ctype_base.h
lrwxrwxrwx   1 andris   users          68 Mar 12 10:58 ctype_inline.h -> ../../../../../gcc/libstdc++-v3/config/os/newlib/bits/ctype_inline.h
lrwxrwxrwx   1 andris   users          71 Mar 12 10:58 ctype_noninline.h -> ../../../../../gcc/libstdc++-v3/config/os/newlib/bits/ctype_noninline.h
lrwxrwxrwx   1 andris   users          66 Mar 12 10:58 os_defines.h -> ../../../../../gcc/libstdc++-v3/config/os/newlib/bits/os_defines.h
-rw-r--r--   1 andris   users       28537 Mar 12 10:58 std_limits.h

I had to edit symlinks to point to correct files and to be able to finish build. 

After that I tried build under Linux gcc-3.0 20010311 as native compiler for DJGPP. 
(I think it would be good test for cross-compiler)

When configuring gcc-3.0 20010311 as native compiler for DJGPP
	
$srcdir/configure --prefix=/dev/env/DJDIR --build=i586-pc-linux-gnu --host=i586-pc-msdosdjgpp \
	--target=i586-pc-msdosdjgpp --with-as=/disk2/gcctest/bin/i586-pc-msdosdjgpp-as

configure incorrectly detected  that it's possible to mmap /dev/zero.
As result I would get failure when compiling gcc/ggc-page.c unless I edit gcc/auto-host.h

gcc/gcc.c unconditionally uses SIGCHLD (line 5483). Perhaps it should be enclosed in
#ifdef SIGCHLD 
  ....
#endif
(This broke compiling gcc.c with when cross-building under Linux native compiler for DJGPP)

--- gcc.c~1	Sat Mar 10 01:01:15 2001
+++ gcc.c	Mon Mar 12 12:28:41 2001
@@ -5480,7 +5480,9 @@
 #endif
   /* We *MUST* set SIGCHLD to SIG_DFL so that the wait4() call will
      receive the signal.  A different setting is inheritable */
+#ifdef SIGCHLD
   signal (SIGCHLD, SIG_DFL);
+#endif
 
   argbuf_length = 10;
   argbuf = (const char **) xmalloc (argbuf_length * sizeof (const char *));


This time symlinks in i586-pc-msdosdjgpp/libstdc++-v3/include/bits were set correctly.

So perhaps I should look whether native compiler for DJGPP I built works at all ...

Andris