9 use Inline (
  10         C => "DATA",
  11         ($ENV{LIBUSB_LIBDIR}
  12             ? ( LIBS => "-L\"$ENV{LIBUSB_LIBDIR}\" " .
  13                         ($^O eq 'MSWin32' ? ' -llibusb -L\"$ENV{W
+INDDK}\\lib\\crt\\i386\" -lmsvcrt ' : '-lusb') )
  14             : ( LIBS => '-lusb', )
  15         ),
  16         ($ENV{LIBUSB_INCDIR} ? ( INC => "-I\"$ENV{LIBUSB_INCDIR}\
+"" ) : () ),
  17         NAME => 'Device::USB',
  18         VERSION => '0.35',
  19         CCFLAGS => "$Config{ccflags} $ENV{CFLAGS} $ENV{CPPFLAGS}"
+,
  20         LDDLFLAGS => "$Config{lddlflags} $ENV{LDFLAGS}",
  21    );
  22 print "CCFLAGS =>|$Config{ccflags}|$ENV{CFLAGS}|$ENV{CPPFLAGS}|\n
+";
  23 print "LDDLFLAGS =>|$Config{lddlflags}|$ENV{LDFLAGS}|\n";

[download]

this gave the following errors and output:

root@gk-kubuntu-dev:~/dav/Nevada# perl kk.pl
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 10.
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 10.
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 10.
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 22.
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 22.
CCFLAGS =>|-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector -fno-
+strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FIL
+E_OFFSET_BITS=64|||
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 23.
LDDLFLAGS =>|-shared -L/usr/local/lib -fstack-protector||

[download]

This indicates $ENV{CFLAGS},$ENV{CPPFLAGS} and $ENV{LDFLAGS} are uninitialized. I'll need to determine what they are supposed to be. There is not much useful I can find. I wonder why the package did not set the variables it needed. Could it be the botched cpan install? Frankly I have no idea what those things should be. I will try defining them as '' or some value

 9 $ENV{CFLAGS} = 'A';
  10 $ENV{CPPFLAGS} = 'B';
  11 $ENV{LDFLAGS} = 'C';
  12 $ENV{LIBUSB_LIBDIR} = 'D';
  13 $ENV{WINDDK} = 'E';
  14 $ENV{LIBUSB__INCDIR} = 'F';
  15 use Inline ( 
  16         C => "DATA",
  17         ($ENV{LIBUSB_LIBDIR}
  18             ? ( LIBS => "-L\"$ENV{LIBUSB_LIBDIR}\" " .
  19                         ($^O eq 'MSWin32' ? ' -llibusb -L\"$ENV{W
+INDDK}\\lib\\crt\\i386\" -lmsvcrt ' : '-lusb') )
  20             : ( LIBS => '-lusb', )
  21         ),
  22         ($ENV{LIBUSB_INCDIR} ? ( INC => "-I\"$ENV{LIBUSB_INCDIR}\
+"" ) : () ),
  23         NAME => 'Device::USB',
  24         VERSION => '0.35',
  25         CCFLAGS => "$Config{ccflags} $ENV{CFLAGS} $ENV{CPPFLAGS}"
+,
  26         LDDLFLAGS => "$Config{lddlflags} $ENV{LDFLAGS}",
  27    ); 
  28 print "CCFLAGS =>|$Config{ccflags}|$ENV{CFLAGS}|$ENV{CPPFLAGS}|\n
+";
  29 print "LDDLFLAGS =>|$Config{lddlflags}|$ENV{LDFLAGS}|\n";

[download]

gives the following errors and output

Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 16.
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 16.
Use of uninitialized value in concatenation (.) or string at /usr/lib/
+perl5/Device/USB.pm line 16.
CCFLAGS =>|-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector -fno-
+strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FIL
+E_OFFSET_BITS=64|A|B|
LDDLFLAGS =>|-shared -L/usr/local/lib -fstack-protector|C|

[download]

from what I can tell, every ENV variable is assigned something, Why are there still 3 concatenation errors?

In reply to Re^4: Device::USB gives "Use of uninitialized value in concatenation" error by holandes777
in thread Device::USB gives "Use of uninitialized value in concatenation" error by holandes777

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.