1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Hello,
I decided to learn HOWTO write applications with ncurses library, but my
attempt failed during linking step (seems to me, that for some reason ld did
not find stdscr).
OS: Win98SE
Source (tnc.c):
#include /* -lncurses */
int
main(int argc, char** argv)
{
// Determine the terminal type and initialize curses data structures.
// The first function called should almost always be initscr().
initscr();
printw("Hello World!"); // write to an imaginary window (stdscr buffer)
refresh(); // dump the buffer contents on the screen
// Clean up after the curses routines. Anytime after the call to
// initscr(), endwin() should be called before exiting.
endwin();
}
$ gcc -otnc -g tnc.c -lncurses
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/bin/ld: warning:
auto-importing has been activated without --enable-auto-import specified on the
command line.
This should work unless it involves constant data structures referencing
symbols from auto-imported DLLs.Info: resolving _stdscr by linking to
__imp__stdscr (auto-import)
Notes:
1. Without refresh() call, the program builds and runs Ok (but, of course,
nothing is shown on the "real" screen).
2. After adding refresh() call, I get the "auto-import" warning shown above,
and again NOTHING is shown on the real screen during program run :-(
Can anybody explain me, where is my mistake?
--
Thank you.
Alexey Lyubimov
Cygwin Configuration Diagnostics
Current System Time: Fri Feb 27 16:30:03 2009
Windows 98 SE Ver 4.10 Build
Path: C:\cygwin\usr\sbin
e:\home\ael\bin
C:\cygwin\usr\local\bin
C:\cygwin\bin
C:\cygwin\bin
C:\cygwin\usr\X11R6\bin
e:\HOME\AEL\BIN
e:\SIEMENS\COMMON\BIN
e:\SIEMENS\COMMON\SQLANY
c:\WINDOWS
c:\WINDOWS\COMMAND
e:\USR\BIN
e:\PROGRA~1\BORLAND\CBUILD~1\BIN
e:\PROGRA~1\BORLAND\CBUILD~1\PROJECTS\BPL
c:\PROGRA~1\COMMON~1\AUTODE~1
e:\USR\LOCAL\MATLAB6P5P1\BIN\WIN32
e:\USR\LOCAL\SVN\BIN
e:\PROGRA~1\IMAGEMAGICK-6.4.9-Q16\BIN
e:\PROGRA~1\7-ZIP
e:\PROGRA~1\SDCC\BIN
e:\PROGRA~1\FIREBIRD\FIREBIRD_2_1\BIN
Output from C:\cygwin\bin\id.exe (nontsec)
UID: 910(ael) GID: 544(all)
544(all)
Output from C:\cygwin\bin\id.exe (ntsec)
UID: 910(ael) GID: 544(all)
544(all)
SysDir: C:\WINDOWS\SYSTEM
WinDir: C:\WINDOWS
USER = 'ael'
PWD = '/cygdrive/e/home/ael/work/ncurses'
CYGWIN = 'server'
HOME = '/cygdrive/e/home/ael'
MAKE_MODE = 'unix'
MANPATH =
'/usr/local/man:/usr/man:/usr/share/man:/usr/autotool/devel/man::/usr/ssl/man'
SQLANY = 'e:\Siemens\Common\sqlany'
HOSTNAME = 'AEL'
TERM = 'cygwin'
CMDLINE = 'bash --login -i'
WINDIR = 'C:\WINDOWS'
CVSROOT = ':local:/cygdrive/c/usr/local/CVS'
OLDPWD = '/cygdrive/e/home/ael/work/gt'
SNDSCAPE = 'C:\WINDOWS'
TEMP = '/cygdrive/c/windows/temp'
TVDUMPFLAGS = '8'
TZ = 'UTC-3MSD'
PS1 = '\[\033]0;\w\007
\033[32m\...@\h \[\033[33m\w\033[0m\]
$ '
!C: = 'C:\cygwin\bin'
WINBOOTDIR = 'C:\WINDOWS'
SHLVL = '1'
FIREBIRD = 'e:\progra~1\firebird\firebird_2_1'
BLASTER = 'A220 I7 D1 T2 '
COMSPEC = 'C:\COMMAND.COM'
PROMPT = '$p$g'
TMP = '/cygdrive/c/windows/temp'
PRINTER = 'PDFCreator'
CVS_RSH = '/bin/ssh'
S7TMP = 'E:\Siemens\Step7\S7tmp'
PGDATA = '/usr/share/postgresql/data'
!E: = 'E:\home\ael\work\ncurses'
INFOPATH =
'/usr/local/info:/usr/info:/usr/share/info:/usr/autotool/devel/info:/usr/autotool/stable/info:'
_ = '/usr/bin/cygcheck'
SYSTEMROOT = 'C:\WINDOWS'
HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions
HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions\Cygwin
HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
(default) = '/cygdrive'
cygdrive flags = 0x0022
HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2
(default) = '/cygdrive'
cygdrive flags = 0x0022
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2\/
(default) = 'C:\cygwin'
flags = 0x000a
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2\/usr/bin
(default) = 'C:\cygwin/bin'
flags = 0x000a
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2\/usr/lib
(default) = 'C:\cygwin/lib'
flags = 0x000a
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\Program Options
a: fd N/AN/A
c: hd FAT32 2935Mb 41% CPUN DOS_32
d: hd FAT 46Mb 55% CPUN DOS
e: hd FAT3212350Mb 92% CPUN
f: cd N/AN/A
. /cygdrive userbinmode,cygdrive
C:\cygwin / system binmode
C:\cygwin/bin /usr/bin system binmode
C:\cygwin/lib /usr/lib system binmode
. /cygdrive system binmode,cygd
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Alexey Lyubimov wrote: > Hello, I decided to learn HOWTO write applications with ncurses library, > but my attempt failed during linking step (seems to me, that for some > reason ld did not find stdscr). Not quite. It found it, but wasn't prepared for /where/ it found it. > $ gcc -otnc -g tnc.c -lncurses > /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/bin/ld: > warning: auto-importing has been activated without --enable-auto-import > specified on the command line. This should work unless it involves constant > data structures referencing symbols from auto-imported DLLs.Info: resolving > _stdscr by linking to __imp__stdscr (auto-import) On win32, linking against shared libraries (DLLs) doesn't work quite the same as on Linux platforms, and this is one of the minor cases. You need to pass the --enable-auto-import option to the linker, which can be done by adding "-Wl,--enable-auto-import" to your gcc command line. Also, the reason it seems to do nothing is because as soon as it prints "Hello World", it immediately exits, restoring the original screen contents! Try adding "getc(stdin)" just after the refresh() call if you want to see the output! cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Thanks a lot, Dave! Your advices helped! But, can I ask you two more questions: 1. Why did initscr() and endwin() not require --enable-auto-import option, but refresh() does? 2. Can you point me to the right place in the documentation (Cygwins's, gcc's, ld's or I don't know whose :)) where auto-import is explained in not very complicated manner (with examples of practical usage for Win32)? -- Thank you, Alexey -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
[Reformatted--please see: http://www.cygwin.com/acronyms/#PCYMTWLL Thanks.] On 2009-02-27 15:10Z, Alexey Lyubimov wrote: > > 2. Can you point me to the right place in the documentation > (Cygwins's, gcc's, ld's or I don't know whose :)) where > auto-import is explained in not very complicated manner > (with examples of practical usage for Win32)? It's a linker (ld) option, so do this: man ld then type this: /auto-import and hit Enter. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Alexey Lyubimov wrote: > 1. Why did initscr() and endwin() not require --enable-auto-import option, > but refresh() does? It's because the initscr() and endwin() functions don't refer to the _stdscr variable internally, so they don't trigger the linker to import anything from the ncurses DLL; i.e., it's just an incidental detail of the internal implementation of the code. (I'm about to commit a patch upstream that will turn on auto-import by default on cygwin, so future releases of binutils won't issue this warning any more.) cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
On Fri, 27 Feb 2009 15:59:13 +, Dave Korn wrote: > Alexey Lyubimov wrote: > >> 1. Why did initscr() and endwin() not require --enable-auto-import >> option, >> but refresh() does? > > It's because the initscr() and endwin() functions don't refer to the > _stdscr > variable internally, so they don't trigger the linker to import anything > from > the ncurses DLL; i.e., it's just an incidental detail of the internal > implementation of the code. > > (I'm about to commit a patch upstream that will turn on auto-import by > default on cygwin, so future releases of binutils won't issue this warning > any > more.) > > cheers, > DaveK > Dave, how can you answer to so many people on so different topics and on so different ML. Are you human ;-) ? -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Vincent R. wrote: > Dave, > > how can you answer to so many people on so different topics and on so > different ML. > Are you human ;-) ? It's just the spirit of the age ... cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Unfortunately, things went worse :-( After I've upgraded to GCC 3.4.4-999 and libncurses9-5.7-2 I get the following error instead of a ld's warning (see my first message in this thread for the reference): $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to `_stdscr' collect2: ld returned 1 exit status "-Wl,--enable-auto-import" works fine with the previous release of GCC v3.4.4-3 and libncurses8. What is wrong now? -- Thank you, Alexey Lyubimov Cygwin Configuration Diagnostics Current System Time: Tue Mar 03 14:36:23 2009 Windows 98 SE Ver 4.10 Build Path: C:\cygwin\usr\sbin e:\home\ael\bin C:\cygwin\usr\local\bin C:\cygwin\bin C:\cygwin\bin C:\cygwin\usr\X11R6\bin e:\HOME\AEL\BIN e:\SIEMENS\COMMON\BIN e:\SIEMENS\COMMON\SQLANY c:\WINDOWS c:\WINDOWS\COMMAND e:\USR\BIN e:\PROGRA~1\BORLAND\CBUILD~1\BIN e:\PROGRA~1\BORLAND\CBUILD~1\PROJECTS\BPL c:\PROGRA~1\COMMON~1\AUTODE~1 e:\USR\LOCAL\MATLAB6P5P1\BIN\WIN32 e:\USR\LOCAL\SVN\BIN e:\PROGRA~1\IMAGEMAGICK-6.4.9-Q16\BIN e:\PROGRA~1\7-ZIP e:\PROGRA~1\SDCC\BIN e:\PROGRA~1\FIREBIRD\FIREBIRD_2_1\BIN Output from C:\cygwin\bin\id.exe (nontsec) UID: 910(ael) GID: 544(all) 544(all) Output from C:\cygwin\bin\id.exe (ntsec) UID: 910(ael) GID: 544(all) 544(all) SysDir: C:\WINDOWS\SYSTEM WinDir: C:\WINDOWS USER = 'ael' PWD = '/cygdrive/e/home/ael/work/ncurses' CYGWIN = 'server' HOME = '/cygdrive/e/home/ael' MAKE_MODE = 'unix' MANPATH = '/usr/local/man:/usr/man:/usr/share/man:/usr/autotool/devel/man::/usr/ssl/man' SQLANY = 'e:\Siemens\Common\sqlany' HOSTNAME = 'AEL' TERM = 'cygwin' CMDLINE = 'bash --login -i' WINDIR = 'C:\WINDOWS' CVSROOT = ':local:/cygdrive/c/usr/local/CVS' OLDPWD = '/cygdrive/e/home/ael/work/gt' SNDSCAPE = 'C:\WINDOWS' TEMP = '/cygdrive/c/windows/temp' TVDUMPFLAGS = '8' TZ = 'UTC-3MSD' PS1 = '\[\033]0;\w\007 \033[32m\...@\h \[\033[33m\w\033[0m\] $ ' !C: = 'C:\cygwin\bin' WINBOOTDIR = 'C:\WINDOWS' SHLVL = '1' FIREBIRD = 'e:\progra~1\firebird\firebird_2_1' BLASTER = 'A220 I7 D1 T2 ' COMSPEC = 'C:\COMMAND.COM' PROMPT = '$p$g' TMP = '/cygdrive/c/windows/temp' PRINTER = 'PDFCreator' CVS_RSH = '/bin/ssh' S7TMP = 'E:\Siemens\Step7\S7tmp' PGDATA = '/usr/share/postgresql/data' !E: = 'E:\Program Files\Mozilla Firefox 2' INFOPATH = '/usr/local/info:/usr/info:/usr/share/info:/usr/autotool/devel/info:/usr/autotool/stable/info:' _ = '/usr/bin/cygcheck' SYSTEMROOT = 'C:\WINDOWS' HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions\Cygwin HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2 (default) = '/cygdrive' cygdrive flags = 0x0022 HKEY_CURRENT_USER\SOFTWARE\Cygnus Solutions\Cygwin\Program Options HKEY_LOCAL_MACHINE\Software\Cygnus Solutions HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2 (default) = '/cygdrive' cygdrive flags = 0x0022 HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2\/ (default) = 'C:\cygwin' flags = 0x000a HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2\/usr/bin (default) = 'C:\cygwin/bin' flags = 0x000a HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\mounts v2\/usr/lib (default) = 'C:\cygwin/lib' flags = 0x000a HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin\Program Options a: fd N/AN/A c: hd FAT32 2935Mb 98% CPUN DOS_32 d: hd FAT 46Mb 55% CPUN DOS e: hd FAT3212350Mb 87% CPUN f: cd N/AN/A . /cygdrive userbinmode,cygdrive C:\cygwin / system binmode C:\cygwin/bin /usr/bin system binmode C:\cygwin/lib /usr/lib system binmode . /cygdrive system binmode,cygdrive Found: C:\cygwin\bin\awk.exe Found: C:\cygwin\bin\bash.exe Found: C:\cygwin\bin\cat.exe Found: C:\cygwin\bin\cp.exe Not Found: cpp (good!) Not Found: crontab Found: C:\cygwin\bin\find.exe Found: c:\WINDOWS\COMMAND\find.exe Warning: C:\cygwin\bin\find.exe hides c:\WINDOWS\COMMAND\find.exe Not Found: gcc Found: C:\cygwin\bin\gdb.exe Found: C:\cygwin\bin\grep.exe Found: e:\PROGRA~1\BORLAND\CBUILD~1\BIN\grep.exe Warning: C:\cygwin\bin\grep.exe hides e:\PROGRA~1\BORLAND\CBUILD~1\BIN\grep.exe Found: C:\cygwin\bin\kill.exe Found: C:\cygwin\bin\ld.exe Found: C:\cygwin\bin\ls.exe Found: C:\cygwin\bin\make.exe Found: e:\USR\BIN\make.exe Warning: C:\cygwin\bin\make.exe hides e:\USR\BIN\make.exe Found: e:\PROGRA~1\BORLAND\CBUILD~1\BIN\make.exe Warning: C:\cygwin\bin\make.exe hides e:\PROGRA~1\BORLAND\CBUILD~1\BIN\make.exe Found: C:\cygwin\bin\mv.exe Found: C:\cygwin\bin\patch.exe Found: C:\cygwin\bin\perl.exe Fo
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Alexey Lyubimov wrote: > Unfortunately, things went worse :-( After I've upgraded to GCC 3.4.4-999 > and libncurses9-5.7-2 I get the following error instead of a ld's warning > (see my first message in this thread for the reference): > > $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses > /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': > /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to > `_stdscr' collect2: ld returned 1 exit status > > "-Wl,--enable-auto-import" works fine with the previous release of GCC > v3.4.4-3 and libncurses8. > > What is wrong now? Dunno yet, but I'll see if I can reproduce. There have been updates to ncurses as well as gcc. I've still got an old ncurses and new gcc: /tmp/hash $ cygcheck -c libncurses-devel gcc-core Cygwin Package Information Package VersionStatus gcc-core 3.4.4-999 OK libncurses-devel 5.5-3 OK .. so I'll see if I can reproduce it, then upgrade my ncurses and try again. cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Alexey Lyubimov wrote: > $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses > /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': > /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to > `_stdscr' collect2: ld returned 1 exit status > > "-Wl,--enable-auto-import" works fine with the previous release of GCC > v3.4.4-3 and libncurses8. > > What is wrong now? Dunno, since I can't reproduce it. But there's been a couple of reissues of ncurses updates recently owing to bugs connected to the exported apis, and while you've got libncurses-5.7-2, I just did an update and got 5.7-3, so I think there's maybe a bugfix version in the process of propagating to the mirrors and not yet announced. Try upgrading again! cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Thanks again, Dave! I've updated again too, and now ncurses 5.7-3 works for me also! :-) -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Alexey Lyubimov wrote: > Unfortunately, things went worse :-( > After I've upgraded to GCC 3.4.4-999 and libncurses9-5.7-2 I get the > following error instead of a ld's warning (see my first message in this > thread for the reference): > > $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses > /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': > /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to `_stdscr' > collect2: ld returned 1 exit status The only way this could've happened is if you compiled tnc.c with the 5.5-3 headers (that is, the ones matching libncurses8) but tried to link against libncurses9 (e.g. 5.7-1, 5.7-2, or 5.7-3). However, because the link libraries and header files are all distributed together in one package (libncurses-devel), AND because you compiled and linked all at once in the same command, I'm at a loss to explain what happened. FYI, for ease of diagnosing build failures like this, I usually -- even when an app consists of only a single source file -- compile and link in separate steps: $ gcc -g -o tnc.o -c tnc.c $ gcc -Wl,--enable-auto-import -o tnc tnc.o -lncurses My first guess, with 5.7-1 and 5.7-2, but not 5.7-3, would be that the stdscr symbol has moved from the ncurses library to the tinfo library, so you needed to link using '-lncurses -ltinfo'. BUT, in the 5.7 versions of ncurses, that symbol is no longer named _stdscr (you use stdscr in YOUR code, but the ncurses.h header magic turns it into ncwrap_stdscr() behind your back). So, if THAT were the problem, you'd have seen "...tnc.c:15: undefined reference to `_ncwrap_scdstr'" once you got to the linker stage. In any case, the tinfo library has been re-merged back into the main ncurses library with the release of 5.7-3/5.7-12. So, my recommendation in any case would have been to upgrade to ncurses-5.7-3 once it propagated to the mirrors. So, I'm glad that fixed the problem for you. Sorry for the trouble. -- Chuck -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Charles Wilson wrote: > Alexey Lyubimov wrote: >> Unfortunately, things went worse :-( >> After I've upgraded to GCC 3.4.4-999 and libncurses9-5.7-2 I get the >> following error instead of a ld's warning (see my first message in this >> thread for the reference): >> >> $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses >> /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': >> /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to `_stdscr' >> collect2: ld returned 1 exit status > > The only way this could've happened is if you compiled tnc.c with the > 5.5-3 headers (that is, the ones matching libncurses8) but tried to link > against libncurses9 (e.g. 5.7-1, 5.7-2, or 5.7-3). However, because the > link libraries and header files are all distributed together in one > package (libncurses-devel), AND because you compiled and linked all at > once in the same command, I'm at a loss to explain what happened. My guess is that Alexey didn't notice a dll-in-use-must-reboot warning on cygncurses-8.dll when running setup.exe, and a reboot might have fixed it. Erk. I wonder what happens if you update, it adds a file to the rename-on-reboot list, then update again - this time without a shell (or whatever) running so that it goes ahead and installs the even-newer version successfully. I suspect a reboot might bring auto-downgrade in its wake :-( not good. Alexey, if this happens, you might need to reinstall libncurses. If you haven't rebooted yet, is there a file called "wininit.ini" in your \WINDOWS folder? Or any file matching "*.dll.new" in /bin? cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Dave Korn wrote: > Charles Wilson wrote: >> Alexey Lyubimov wrote: >>> $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses >>> /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': >>> /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to `_stdscr' >>> collect2: ld returned 1 exit status > My guess is that Alexey didn't notice a dll-in-use-must-reboot warning on > cygncurses-8.dll when running setup.exe, and a reboot might have fixed it. Nah. That scenario might cause a run-time failure, but not a link-time failure like the one Alexey described. -- Chuck -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Charles Wilson wrote: > Dave Korn wrote: >> Charles Wilson wrote: >>> Alexey Lyubimov wrote: > $ gcc -otnc -g -Wl,--enable-auto-import tnc.c -lncurses /cygdrive/c/windows/temp/ccUqygVy.o: In function `main': /cygdrive/e/home/ael/work/ncurses/tnc.c:15: undefined reference to `_stdscr' collect2: ld returned 1 exit status > >> My guess is that Alexey didn't notice a dll-in-use-must-reboot warning on >> cygncurses-8.dll when running setup.exe, and a reboot might have fixed it. > > Nah. That scenario might cause a run-time failure, but not a link-time > failure like the one Alexey described. He'd end up with the old DLL but the /new/ import library, wouldn't he? So adding -ltinfo might fix the link, but then it would fail to find the right imports if he had tried running it? cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Dave Korn wrote: > Charles Wilson wrote: >> Nah. That scenario might cause a run-time failure, but not a link-time >> failure like the one Alexey described. > > He'd end up with the old DLL but the /new/ import library, wouldn't he? So > adding -ltinfo might fix the link, but then it would fail to find the right > imports if he had tried running it? > Exactly. -- Chuck -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Charles Wilson wrote: > Dave Korn wrote: >> Charles Wilson wrote: >>> Nah. That scenario might cause a run-time failure, but not a link-time >>> failure like the one Alexey described. >> He'd end up with the old DLL but the /new/ import library, wouldn't he? So >> adding -ltinfo might fix the link, but then it would fail to find the right >> imports if he had tried running it? >> > > Exactly. Right; but seeing as he /didn't/ add -ltinfo, he would have ended up with exactly the error we saw, wouldn't he? cheers, DaveK -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: 1.5.25-15: First steps with ncurses programming: can NOT build Hello_world app
Dave Korn wrote: > Right; but seeing as he /didn't/ add -ltinfo, he would have ended up with > exactly the error we saw, wouldn't he? No, because the headers that came with 5.7-2 had macros that turned his code 'curscr' into 'ncwrap_curscr()'. In the briefly released 5.7-1 the macros turned 'curscr' into '_nc_curscr()'. So, the only way his object code would be "looking" for the symbol "_curscr" would be if he was using the headers from ncurses-5.5-3 or older. But the headers and import libraries are distributed in the same package; it's not possible to have the headers from one release and the import libraries from a different one. Unless you do $ gcc -o foo.o -c foo.c and then upgrade ncurses-devel, before doing $ gcc -o foo.exe foo.o -lncurses But Alexey did the compile and link all in one command. That's a REALLY fast setup.exe... That's why I was confused. But, 'tis working now, with 5.7-3. So... -- Chuck -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
