Hello everyone,
I'm not sure whether this is a make or a cygwin issue, but it has
occured to me only on cygwin, so I thought to ask here first.
To illustrate my problem, I have written a little testcase (options.c)
which uses libpopt and illustrate how to reproduce the behaviour at the
bottom of this message.
I think the basic issue here is that the linker only resolves symbols in
files in the order as they appear on the command line.
This is afaik not an erroneous behaviour, but it doesn't play well with
the builtin make rules as shown below.
This test was run using a fresh cygwin install from today, on a windows
XP host.
The account I'm using is an administrator account.
# Version of the make and cc programs.
$ cc --version = cc (GCC) 4.3.4 20090804 (release) 1
$ make --version = GNU Make 3.81
# Only the C source file is present, and it uses libpopt.
$ ls
options.c
# Using builtin make rules and LDFLAGS seems to yield an incorrect
order of arguments for cc.
$ LDFLAGS=-lpopt make options
cc -lpopt options.c -o options
/tmp/ccW0jXSk.o:options.c:(.text+0x3e): undefined reference to
`_poptGetContext'
/tmp/ccW0jXSk.o:options.c:(.text+0x56): undefined reference to
`_poptGetNextOpt'
/tmp/ccW0jXSk.o:options.c:(.text+0x78): undefined reference to
`_poptBadOption'
/tmp/ccW0jXSk.o:options.c:(.text+0x85): undefined reference to
`_poptStrerror'
/tmp/ccW0jXSk.o:options.c:(.text+0xb8): undefined reference to
`_poptPrintHelp'
/tmp/ccW0jXSk.o:options.c:(.text+0xfa): undefined reference to
`_poptFreeContext'
/tmp/ccW0jXSk.o:options.c:(.data+0x68): undefined reference to
`_poptHelpOptions'
collect2: ld returned 1 exit status
make: *** [options] Error 1
# When '-lpopt' is positioned after the source file, no linker
errors appear.
$ cc options.c -lpopt -o options
(no output)
# And a working executable is produced.
$ ./options.exe -t
test option set!
Kind regards,
Robrecht
#include stdio.h
#include popt.h
#include stdbool.h
static bool testSet = false;
static struct poptOption subOptionsTable[] = {
{ test, 't', POPT_ARG_NONE, testSet, 0, do a test, NULL },
POPT_TABLEEND
};
static struct poptOption mainOptionsTable[] = {
{ NULL, '\0', POPT_ARG_INCLUDE_TABLE, NULL, 0, sub1, NULL },
POPT_AUTOHELP POPT_TABLEEND
};
int main(int argc, const char * argv[]) {
int ret;
poptContext optCon = poptGetContext(NULL, argc, argv, mainOptionsTable, 0);
mainOptionsTable[0].arg = subOptionsTable;
while ((ret = poptGetNextOpt(optCon)) 0);
if (ret -1) {
printf(\n%s: %s\n\n, poptStrerror(ret), poptBadOption(optCon, 0));
poptPrintHelp(optCon, stdout, 0);
return -1;
}
printf(test option%sset!, testSet ? : not );
optCon = poptFreeContext(optCon);
return 0;
}
Cygwin Configuration Diagnostics
Current System Time: Tue Apr 06 22:21:43 2010
Windows XP Professional Ver 5.1 Build 2600 Service Pack 3
Path: C:\cygwin\usr\local\bin
C:\cygwin\bin
C:\cygwin\bin
C:\WINDOWS\system32
C:\WINDOWS
C:\WINDOWS\System32\Wbem
Output from C:\cygwin\bin\id.exe
UID: 1003(robbe)GID: 513(None)
513(None) 0(root) 544(Administrators) 545(Users)
SysDir: C:\WINDOWS\system32
WinDir: C:\WINDOWS
USER = 'robbe'
PWD = '/home/robbe'
HOME = '/home/robbe'
HOMEPATH = '\Documents and Settings\robbe'
MANPATH = '/usr/local/man:/usr/share/man:/usr/man::/usr/ssl/man'
APPDATA = 'C:\Documents and Settings\robbe\Application Data'
HOSTNAME = 'lemming'
TERM = 'cygwin'
PROCESSOR_IDENTIFIER = 'x86 Family 6 Model 15 Stepping 6, GenuineIntel'
WINDIR = 'C:\WINDOWS'
OLDPWD = '/usr/bin'
USERDOMAIN = 'LEMMING'
OS = 'Windows_NT'
ALLUSERSPROFILE = 'C:\Documents and Settings\All Users'
!:: = '::\'
VS90COMNTOOLS = 'C:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\'
COMMONPROGRAMFILES = 'C:\Program Files\Common Files'
USERNAME = 'robbe'
PROCESSOR_LEVEL = '6'
FP_NO_HOST_CHECK = 'NO'
SYSTEMDRIVE = 'C:'
LANG = 'C.UTF-8'
USERPROFILE = 'C:\Documents and Settings\robbe'
CLIENTNAME = 'Console'
PS1 = '\[\e]0;\w\a\]\n\[\e[32m\...@\h \[\e[33m\]\w\[\e[0m\]\n\$ '
LOGONSERVER = '\\LEMMING'
PROCESSOR_ARCHITECTURE = 'x86'
!C: = 'C:\cygwin\bin'
SHLVL = '1'
PATHEXT = '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH'
HOMEDRIVE = 'C:'
PROMPT = '$P$G'
COMSPEC = 'C:\WINDOWS\system32\cmd.exe'
SYSTEMROOT = 'C:\WINDOWS'
PRINTER = 'Microsoft XPS Document Writer'
CVS_RSH = '/bin/ssh'
PROCESSOR_REVISION = '0f06'
INFOPATH = '/usr/local/info:/usr/share/info:/usr/info:'
PROGRAMFILES = 'C:\Program Files'
NUMBER_OF_PROCESSORS = '1'
SESSIONNAME = 'Console'
COMPUTERNAME = 'LEMMING'
_ = '/usr/bin/cygcheck'
HKEY_CURRENT_USER\Software\Cygwin
HKEY_CURRENT_USER\Software\Cygwin\Program Options
HKEY_CURRENT_USER\Software\Cygwin\setup
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start
Menu2\Programs\Cygwin
(default) = (unsupported type)
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Installations
(default) = '\??\C:\cygwin'
