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Date:	Tue, 08 Apr 2008 12:40:42 -0400
From:	Robert Eckhoff <rpe2101 AT gmail DOT com>
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To:	Dave Korn <dave DOT korn AT artimi DOT com>, cygwin AT cygwin DOT com
Subject:	Re: Compiling Cygwin on Linux
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Below are the errors I received before I made their associated changes.
Dave Korn wrote:
> Robert Eckhoff wrote on 05 April 2008 22:39:
>
>   
>> directories. Winsup also had some source problems that I corrected.
>>
>> ~/cygwin-1.5.25-11/winsup/cygwin/winsup.h:276
>> -extern bool wsock_started;
>> +extern "C" bool wsock_started;
>>
>>     
Before I made the change, Error:
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/winsup.h:276: error: 
previous declaration of 'bool wsock_started' with 'C++' linkage
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/autoload.cc:246: error: 
conflicts with new declaration with 'C' linkage

>> ~/cygwin-1.5.25-11/winsup/cygwin/winsup.h:156
>> -extern int __api_fatal_exit_val;
>> +extern "C" int __api_fatal_exit_val;
>>
>>     
>> ~/cygwin-1.5.25-11/winsup/cygwin/environ.h:46
>> -extern char **__cygwin_environ, ***main_environ;
>> +extern "C" char **__cygwin_environ, ***main_environ;
>>     
>
>   
i686-pc-cygwin-c++ -L/home/rpeckhoff/cygwin/i686-pc-cygwin/winsup 
-L/home/rpeckhoff/cygwin/i686-pc-cygwin/winsup/cygwin 
-L/home/rpeckhoff/cygwin/i686-pc-cygwin/winsup/w32api/lib -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/include -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/include -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/w32api/include 
-B/home/rpeckhoff/cygwin/i686-pc-cygwin/newlib/ -isystem 
/home/rpeckhoff/cygwin/i686-pc-cygwin/newlib/targ-include -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/newlib/libc/include -c -nostdinc++  
-DHAVE_CONFIG_H  -O2 -g -O2  -MMD  -fmerge-constants -ftracer  -Wall 
-Wstrict-aliasing -Wwrite-strings -fno-common -pipe -fbuiltin 
-fmessage-length=0  -I.  
-I/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin  
-I/home/rpeckhoff/cygwin-1.5.25-11/winsup/w32api/include 
-I/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/config/i386 
-I/home/rpeckhoff/sysroot/usr/lib/gcc/i686-pc-cygwin/4.3.0/include 
-fno-rtti -fno-exceptions -o ./dcrt0.o 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/dcrt0.cc
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/environ.h:46: error: 
previous declaration of 'char** __cygwin_environ' with 'C++' linkage
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/dcrt0.cc:94: error: 
conflicts with new declaration with 'C' linkage
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/environ.h:46: error: 
previous declaration of 'char*** main_environ' with 'C++' linkage
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/dcrt0.cc:95: error: 
conflicts with new declaration with 'C' linkage
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/winsup.h:156: error: 
previous declaration of 'int __api_fatal_exit_val' with 'C++' linkage
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/dcrt0.cc:125: error: 
conflicts with new declaration with 'C' linkage


>> ~/cygwin-1.5.25-11/winsup/cygwin/syscall.cc:3238
>> Uses goto's which breaks the build with gcc4.3. I rewrote the function
>> to use if statements.
>>     
>
>   What kind of problem does gcc4.3 have with gotos?  There's nothing wrong
> with them in general and lots of other functions in that file have them, so
> maybe there's some underlying problem which is the actual thing that needs
> fixing?
>
>     cheers,
>       DaveK
>   

The actual error is this:
i686-pc-cygwin-c++ -L/home/rpeckhoff/cygwin/i686-pc-cygwin/winsup 
-L/home/rpeckhoff/cygwin/i686-pc-cygwin/winsup/cygwin 
-L/home/rpeckhoff/cygwin/i686-pc-cygwin/winsup/w32api/lib -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/include -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/include -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/w32api/include 
-B/home/rpeckhoff/cygwin/i686-pc-cygwin/newlib/ -isystem 
/home/rpeckhoff/cygwin/i686-pc-cygwin/newlib/targ-include -isystem 
/home/rpeckhoff/cygwin-1.5.25-11/newlib/libc/include -c -nostdinc++  
-DHAVE_CONFIG_H  -O2 -g -O2  -MMD -fomit-frame-pointer -fmerge-constants 
-ftracer  -Wall -Wstrict-aliasing -Wwrite-strings -fno-common -pipe 
-fbuiltin -fmessage-length=0  -I.  
-I/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin  
-I/home/rpeckhoff/cygwin-1.5.25-11/winsup/w32api/include 
-I/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/config/i386 
-I/home/rpeckhoff/sysroot/usr/lib/gcc/i686-pc-cygwin/4.3.0/include 
-fno-rtti -fno-exceptions -o ./syscalls.o 
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc: In function 
'FILE* popen(const char*, const char*)':
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc:3238: error: 
jump to label 'err'
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc:3230: 
error:   from here
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc:3233: 
error:   crosses initialization of 'fhandler_pipe* fh'
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc:3238: error: 
jump to label 'err'
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc:3210: 
error:   from here
/home/rpeckhoff/cygwin-1.5.25-11/winsup/cygwin/syscalls.cc:3233: 
error:   crosses initialization of 'fhandler_pipe* fh'
make[3]: *** [syscalls.o] Error 1

Thanks you for your help.
~Robert

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