Imager::Probe - hot needle of inquiry for libraries
require Imager::Probe; my %probe = ( # short name of what we're looking for (displayed to user) name => "FOO", # pkg-config lookup pkg => [ qw/name1 name2 name3/ ], # perl subs that probe for the library code => [ \&foo_probe1, \&foo_probe2 ], # or just: code => \&foo_probe, inccheck => sub { ... }, libcheck => sub { ... }, # search for this library if libcheck not supplied libbase => "foo", # library link time options, uses libbase to build options otherwise libopts => "-lfoo", # C code to check the library is sane testcode => "...", # header files needed testcodeheaders => [ "stdio.h", "foo.h" ], ); my $result = Imager::Probe->probe(\%probe) or print "Foo library not found: ",Imager::Probe->error;
Does the probes that were hidden in Imager's Makefile.PL, pulled out so the file format libraries can be externalized.
The return value is either nothing if the probe fails, or a hash containing:
INC - -I and other C options
INC
-I
LIBS - -L, -l and other link-time options
LIBS
-L
-l
DEFINE - -D options, if any.
DEFINE
-D
The possible values for the hash supplied to the probe() method are:
pkg - an array of pkg-config names to probe for. If the pkg-config checks pass, inccheck and libcheck aren't used.
pkg
inccheck
libcheck
inccheck - a code reference that checks if the supplied include directory contains the required header files.
libcheck - a code reference that checks if the supplied library directory contains the required library files. Note: the Makefile.PL version of this was supplied all of the library file names instead. libcheck can also be an arrayref of library check code references, all of which must find a match for the library to be considered "found".
libbase - if inccheck is supplied, but libcheck isn't, then a libcheck that checks for liblibbase$Config{_a} and liblibbase.$Config{so} is created. If libopts isn't supplied then that can be synthesized as -llibbase. libbase can also be an arrayref of library base names to search for, in which case all of the libraries mentioned must be found for the probe to succeed.
libbase
lib
libopts
-llibbase
libopts - if the libraries are found via inccheck/libcheck, these are the -l options to supply during the link phase.
code - a code reference to perform custom checks. Returns the probe result directly. Can also be an array ref of functions to call.
code
testcode - test C code that is run with Devel::CheckLib. You also need to set testcodeheaders.
testcode
testcodeheaders
testcodeprologue - C code to insert between the headers and the main function.
testcodeprologue
incpath - $Config{path_sep} separated list of header file directories to check, or a reference to an array of such.
incpath
$Config{path_sep}
libpath - $Config{path_sep} separated list of library file directories to check, or a reference to an array of such.
libpath
alternatives - an optional array reference of alternate configurations (as hash references) to test if the primary configuration isn't successful. Each alternative should include an altname key describing the alternative. Any key not mentioned in an alternative defaults to the value from the main configuration.
alternatives
altname
Tony Cook <tonyc@cpan.org>, Arnar M. Hrafnkelsson
To install Imager, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Imager
CPAN shell
perl -MCPAN -e shell install Imager
For more information on module installation, please visit the detailed CPAN module installation guide.