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Commit c3a43b4f authored by Greg Ward's avatar Greg Ward
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Docstring reformatting/tweaking binge. 

Fixed a few comments.
parent c3f36446
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Lib/distutils/ccompiler.py
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......@@ -17,18 +17,17 @@ from distutils.util import move_file, mkpath, newer_pairwise, newer_group
class CCompiler:
"""Abstract base class to define the interface that must be implemented
by real compiler abstraction classes. Might have some use as a
place for shared code, but it's not yet clear what code can be
shared between compiler abstraction models for different platforms.
The basic idea behind a compiler abstraction class is that each
instance can be used for all the compile/link steps in building
a single project. Thus, attributes common to all of those compile
and link steps -- include directories, macros to define, libraries
to link against, etc. -- are attributes of the compiler instance.
To allow for variability in how individual files are treated,
most (all?) of those attributes may be varied on a per-compilation
or per-link basis."""
by real compiler classes. Also has some utility methods used by
several compiler classes.
The basic idea behind a compiler abstraction class is that each
instance can be used for all the compile/link steps in building a
single project. Thus, attributes common to all of those compile and
link steps -- include directories, macros to define, libraries to link
against, etc. -- are attributes of the compiler instance. To allow for
variability in how individual files are treated, most of those
attributes may be varied on a per-compilation or per-link basis.
"""
# 'compiler_type' is a class attribute that identifies this class. It
# keeps code that wants to know what kind of compiler it's dealing with
......@@ -46,10 +45,6 @@ class CCompiler:
# should be the domain of concrete compiler abstraction classes
# (UnixCCompiler, MSVCCompiler, etc.) -- or perhaps the base
# class should have methods for the common ones.
# * can't put output files (object files, libraries, whatever)
# into a separate directory from their inputs. Should this be
# handled by an 'output_dir' attribute of the whole object, or a
# parameter to the compile/link_* methods, or both?
# * can't completely override the include or library searchg
# path, ie. no "cc -I -Idir1 -Idir2" or "cc -L -Ldir1 -Ldir2".
# I'm not sure how widely supported this is even by Unix
......@@ -129,10 +124,9 @@ class CCompiler:
def _check_macro_definitions (self, definitions):
"""Ensures that every element of 'definitions' is a valid macro
definition, ie. either (name,value) 2-tuple or a (name,)
tuple. Do nothing if all definitions are OK, raise
TypeError otherwise."""
definition, ie. either (name,value) 2-tuple or a (name,) tuple. Do
nothing if all definitions are OK, raise TypeError otherwise.
"""
for defn in definitions:
if not (type (defn) is TupleType and
(len (defn) == 1 or
......@@ -148,12 +142,12 @@ class CCompiler:
# -- Bookkeeping methods -------------------------------------------
def define_macro (self, name, value=None):
"""Define a preprocessor macro for all compilations driven by
this compiler object. The optional parameter 'value' should be
a string; if it is not supplied, then the macro will be defined
without an explicit value and the exact outcome depends on the
compiler used (XXX true? does ANSI say anything about this?)"""
"""Define a preprocessor macro for all compilations driven by this
compiler object. The optional parameter 'value' should be a
string; if it is not supplied, then the macro will be defined
without an explicit value and the exact outcome depends on the
compiler used (XXX true? does ANSI say anything about this?)
"""
# Delete from the list of macro definitions/undefinitions if
# already there (so that this one will take precedence).
i = self._find_macro (name)
......@@ -166,13 +160,13 @@ class CCompiler:
def undefine_macro (self, name):
"""Undefine a preprocessor macro for all compilations driven by
this compiler object. If the same macro is defined by
'define_macro()' and undefined by 'undefine_macro()' the last
call takes precedence (including multiple redefinitions or
undefinitions). If the macro is redefined/undefined on a
per-compilation basis (ie. in the call to 'compile()'), then
that takes precedence."""
this compiler object. If the same macro is defined by
'define_macro()' and undefined by 'undefine_macro()' the last call
takes precedence (including multiple redefinitions or
undefinitions). If the macro is redefined/undefined on a
per-compilation basis (ie. in the call to 'compile()'), then that
takes precedence.
"""
# Delete from the list of macro definitions/undefinitions if
# already there (so that this one will take precedence).
i = self._find_macro (name)
......@@ -184,86 +178,94 @@ class CCompiler:
def add_include_dir (self, dir):
"""Add 'dir' to the list of directories that will be searched
for header files. The compiler is instructed to search
directories in the order in which they are supplied by
successive calls to 'add_include_dir()'."""
"""Add 'dir' to the list of directories that will be searched for
header files. The compiler is instructed to search directories in
the order in which they are supplied by successive calls to
'add_include_dir()'.
"""
self.include_dirs.append (dir)
def set_include_dirs (self, dirs):
"""Set the list of directories that will be searched to 'dirs'
(a list of strings). Overrides any preceding calls to
'add_include_dir()'; subsequence calls to 'add_include_dir()'
add to the list passed to 'set_include_dirs()'. This does
not affect any list of standard include directories that
the compiler may search by default."""
"""Set the list of directories that will be searched to 'dirs' (a
list of strings). Overrides any preceding calls to
'add_include_dir()'; subsequence calls to 'add_include_dir()' add
to the list passed to 'set_include_dirs()'. This does not affect
any list of standard include directories that the compiler may
search by default.
"""
self.include_dirs = copy (dirs)
def add_library (self, libname):
"""Add 'libname' to the list of libraries that will be included
in all links driven by this compiler object. Note that
'libname' should *not* be the name of a file containing a
library, but the name of the library itself: the actual filename
will be inferred by the linker, the compiler, or the compiler
abstraction class (depending on the platform).
The linker will be instructed to link against libraries in the
order they were supplied to 'add_library()' and/or
'set_libraries()'. It is perfectly valid to duplicate library
names; the linker will be instructed to link against libraries
as many times as they are mentioned."""
"""Add 'libname' to the list of libraries that will be included in
all links driven by this compiler object. Note that 'libname'
should *not* be the name of a file containing a library, but the
name of the library itself: the actual filename will be inferred by
the linker, the compiler, or the compiler class (depending on the
platform).
The linker will be instructed to link against libraries in the
order they were supplied to 'add_library()' and/or
'set_libraries()'. It is perfectly valid to duplicate library
names; the linker will be instructed to link against libraries as
many times as they are mentioned.
"""
self.libraries.append (libname)
def set_libraries (self, libnames):
"""Set the list of libraries to be included in all links driven
by this compiler object to 'libnames' (a list of strings).
This does not affect any standard system libraries that the
linker may include by default."""
"""Set the list of libraries to be included in all links driven by
this compiler object to 'libnames' (a list of strings). This does
not affect any standard system libraries that the linker may
include by default.
"""
self.libraries = copy (libnames)
def add_library_dir (self, dir):
"""Add 'dir' to the list of directories that will be searched for
libraries specified to 'add_library()' and 'set_libraries()'.
The linker will be instructed to search for libraries in the
order they are supplied to 'add_library_dir()' and/or
'set_library_dirs()'."""
libraries specified to 'add_library()' and 'set_libraries()'. The
linker will be instructed to search for libraries in the order they
are supplied to 'add_library_dir()' and/or 'set_library_dirs()'.
"""
self.library_dirs.append (dir)
def set_library_dirs (self, dirs):
"""Set the list of library search directories to 'dirs' (a list
of strings). This does not affect any standard library
search path that the linker may search by default."""
"""Set the list of library search directories to 'dirs' (a list of
strings). This does not affect any standard library search path
that the linker may search by default.
"""
self.library_dirs = copy (dirs)
def add_runtime_library_dir (self, dir):
"""Add 'dir' to the list of directories that will be searched for
shared libraries at runtime."""
shared libraries at runtime.
"""
self.runtime_library_dirs.append (dir)
def set_runtime_library_dirs (self, dirs):
"""Set the list of directories to search for shared libraries
at runtime to 'dirs' (a list of strings). This does not affect
any standard search path that the runtime linker may search by
default."""
"""Set the list of directories to search for shared libraries at
runtime to 'dirs' (a list of strings). This does not affect any
standard search path that the runtime linker may search by
default.
"""
self.runtime_library_dirs = copy (dirs)
def add_link_object (self, object):
"""Add 'object' to the list of object files (or analogues, such
as explictly named library files or the output of "resource
compilers") to be included in every link driven by this
compiler object."""
"""Add 'object' to the list of object files (or analogues, such as
explictly named library files or the output of "resource
compilers") to be included in every link driven by this compiler
object.
"""
self.objects.append (object)
def set_link_objects (self, objects):
"""Set the list of object files (or analogues) to be included
in every link to 'objects'. This does not affect any
standard object files that the linker may include by default
(such as system libraries)."""
"""Set the list of object files (or analogues) to be included in
every link to 'objects'. This does not affect any standard object
files that the linker may include by default (such as system
libraries).
"""
self.objects = copy (objects)
......@@ -271,15 +273,15 @@ class CCompiler:
# (here for the convenience of subclasses)
def _fix_compile_args (self, output_dir, macros, include_dirs):
"""Typecheck and fix-up some of the arguments to the 'compile()' method,
and return fixed-up values. Specifically: if 'output_dir' is
None, replaces it with 'self.output_dir'; ensures that 'macros'
is a list, and augments it with 'self.macros'; ensures that
'include_dirs' is a list, and augments it with
'self.include_dirs'. Guarantees that the returned values are of
the correct type, i.e. for 'output_dir' either string or None,
and for 'macros' and 'include_dirs' either list or None."""
"""Typecheck and fix-up some of the arguments to the 'compile()'
method, and return fixed-up values. Specifically: if 'output_dir'
is None, replaces it with 'self.output_dir'; ensures that 'macros'
is a list, and augments it with 'self.macros'; ensures that
'include_dirs' is a list, and augments it with 'self.include_dirs'.
Guarantees that the returned values are of the correct type,
i.e. for 'output_dir' either string or None, and for 'macros' and
'include_dirs' either list or None.
"""
if output_dir is None:
output_dir = self.output_dir
elif type (output_dir) is not StringType:
......@@ -307,11 +309,11 @@ class CCompiler:
def _prep_compile (self, sources, output_dir):
"""Determine the list of object files corresponding to 'sources', and
figure out which ones really need to be recompiled. Return a list
of all object files and a dictionary telling which source files can
be skipped."""
"""Determine the list of object files corresponding to 'sources',
and figure out which ones really need to be recompiled. Return a
list of all object files and a dictionary telling which source
files can be skipped.
"""
# Get the list of expected output (object) files
objects = self.object_filenames (sources,
output_dir=output_dir)
......@@ -330,8 +332,8 @@ class CCompiler:
skip_source[source] = 1
(n_sources, n_objects) = newer_pairwise (sources, objects)
for source in n_sources: # no really, only rebuild what's out-of-date
skip_source[source] = 0
for source in n_sources: # no really, only rebuild what's
skip_source[source] = 0 # out-of-date
return (objects, skip_source)
......@@ -339,11 +341,11 @@ class CCompiler:
def _fix_object_args (self, objects, output_dir):
"""Typecheck and fix up some arguments supplied to various
methods. Specifically: ensure that 'objects' is a list; if
output_dir is None, replace with self.output_dir. Return fixed
versions of 'objects' and 'output_dir'."""
"""Typecheck and fix up some arguments supplied to various methods.
Specifically: ensure that 'objects' is a list; if output_dir is
None, replace with self.output_dir. Return fixed versions of
'objects' and 'output_dir'.
"""
if type (objects) not in (ListType, TupleType):
raise TypeError, \
"'objects' must be a list or tuple of strings"
......@@ -359,11 +361,11 @@ class CCompiler:
def _fix_lib_args (self, libraries, library_dirs, runtime_library_dirs):
"""Typecheck and fix up some of the arguments supplied to the
'link_*' methods. Specifically: ensure that all arguments are
lists, and augment them with their permanent versions
(eg. 'self.libraries' augments 'libraries'). Return a tuple
with fixed versions of all arguments."""
'link_*' methods. Specifically: ensure that all arguments are
lists, and augment them with their permanent versions
(eg. 'self.libraries' augments 'libraries'). Return a tuple with
fixed versions of all arguments.
"""
if libraries is None:
libraries = self.libraries
elif type (libraries) in (ListType, TupleType):
......@@ -396,9 +398,9 @@ class CCompiler:
def _need_link (self, objects, output_file):
"""Return true if we need to relink the files listed in 'objects' to
recreate 'output_file'."""
"""Return true if we need to relink the files listed in 'objects'
to recreate 'output_file'.
"""
if self.force:
return 1
else:
......@@ -438,44 +440,44 @@ class CCompiler:
debug=0,
extra_preargs=None,
extra_postargs=None):
"""Compile one or more C/C++ source files. 'sources' must be
a list of strings, each one the name of a C/C++ source
file. Return a list of object filenames, one per source
filename in 'sources'. Depending on the implementation,
not all source files will necessarily be compiled, but
all corresponding object filenames will be returned.
If 'output_dir' is given, object files will be put under it,
while retaining their original path component. That is,
"foo/bar.c" normally compiles to "foo/bar.o" (for a Unix
implementation); if 'output_dir' is "build", then it would
compile to "build/foo/bar.o".
'macros', if given, must be a list of macro definitions. A
macro definition is either a (name, value) 2-tuple or a (name,)
1-tuple. The former defines a macro; if the value is None, the
macro is defined without an explicit value. The 1-tuple case
undefines a macro. Later definitions/redefinitions/
undefinitions take precedence.
'include_dirs', if given, must be a list of strings, the
directories to add to the default include file search path for
this compilation only.
'debug' is a boolean; if true, the compiler will be instructed
to output debug symbols in (or alongside) the object file(s).
'extra_preargs' and 'extra_postargs' are implementation-
dependent. On platforms that have the notion of a command-line
(e.g. Unix, DOS/Windows), they are most likely lists of strings:
extra command-line arguments to prepand/append to the compiler
command line. On other platforms, consult the implementation
class documentation. In any event, they are intended as an
escape hatch for those occasions when the abstract compiler
framework doesn't cut the mustard.
Raises CompileError on failure."""
"""Compile one or more C/C++ source files. 'sources' must be a
list of strings, each one the name of a C/C++ source file. Return
a list of object filenames, one per source filename in 'sources'.
Depending on the implementation, not all source files will
necessarily be compiled, but all corresponding object filenames
will be returned.
If 'output_dir' is given, object files will be put under it, while
retaining their original path component. That is, "foo/bar.c"
normally compiles to "foo/bar.o" (for a Unix implementation); if
'output_dir' is "build", then it would compile to
"build/foo/bar.o".
'macros', if given, must be a list of macro definitions. A macro
definition is either a (name, value) 2-tuple or a (name,) 1-tuple.
The former defines a macro; if the value is None, the macro is
defined without an explicit value. The 1-tuple case undefines a
macro. Later definitions/redefinitions/ undefinitions take
precedence.
'include_dirs', if given, must be a list of strings, the
directories to add to the default include file search path for this
compilation only.
'debug' is a boolean; if true, the compiler will be instructed to
output debug symbols in (or alongside) the object file(s).
'extra_preargs' and 'extra_postargs' are implementation- dependent.
On platforms that have the notion of a command-line (e.g. Unix,
DOS/Windows), they are most likely lists of strings: extra
command-line arguments to prepand/append to the compiler command
line. On other platforms, consult the implementation class
documentation. In any event, they are intended as an escape hatch
for those occasions when the abstract compiler framework doesn't
cut the mustard.
Raises CompileError on failure.
"""
pass
......@@ -484,25 +486,24 @@ class CCompiler:
output_libname,
output_dir=None,
debug=0):
"""Link a bunch of stuff together to create a static library
file. The "bunch of stuff" consists of the list of object
files supplied as 'objects', the extra object files supplied
to 'add_link_object()' and/or 'set_link_objects()', the
libraries supplied to 'add_library()' and/or
'set_libraries()', and the libraries supplied as 'libraries'
(if any).
'output_libname' should be a library name, not a filename; the
filename will be inferred from the library name. 'output_dir'
is the directory where the library file will be put.
'debug' is a boolean; if true, debugging information will be
included in the library (note that on most platforms, it is the
compile step where this matters: the 'debug' flag is included
here just for consistency).
Raises LibError on failure."""
"""Link a bunch of stuff together to create a static library file.
The "bunch of stuff" consists of the list of object files supplied
as 'objects', the extra object files supplied to
'add_link_object()' and/or 'set_link_objects()', the libraries
supplied to 'add_library()' and/or 'set_libraries()', and the
libraries supplied as 'libraries' (if any).
'output_libname' should be a library name, not a filename; the
filename will be inferred from the library name. 'output_dir' is
the directory where the library file will be put.
'debug' is a boolean; if true, debugging information will be
included in the library (note that on most platforms, it is the
compile step where this matters: the 'debug' flag is included here
just for consistency).
Raises LibError on failure.
"""
pass
......@@ -517,44 +518,44 @@ class CCompiler:
debug=0,
extra_preargs=None,
extra_postargs=None):
"""Link a bunch of stuff together to create a shared library
file. Similar semantics to 'create_static_lib()', with the
addition of other libraries to link against and directories to
search for them. Also, of course, the type and name of
the generated file will almost certainly be different, as will
the program used to create it.
'libraries' is a list of libraries to link against. These are
library names, not filenames, since they're translated into
filenames in a platform-specific way (eg. "foo" becomes
"libfoo.a" on Unix and "foo.lib" on DOS/Windows). However, they
can include a directory component, which means the linker will
look in that specific directory rather than searching all the
normal locations.
'library_dirs', if supplied, should be a list of directories to
search for libraries that were specified as bare library names
(ie. no directory component). These are on top of the system
default and those supplied to 'add_library_dir()' and/or
'set_library_dirs()'. 'runtime_library_dirs' is a list of
directories that will be embedded into the shared library and
used to search for other shared libraries that *it* depends on
at run-time. (This may only be relevant on Unix.)
'export_symbols' is a list of symbols that the shared library
will export. (This appears to be relevant only on Windows.)
'debug' is as for 'compile()' and 'create_static_lib()', with the
slight distinction that it actually matters on most platforms
(as opposed to 'create_static_lib()', which includes a 'debug'
flag mostly for form's sake).
'extra_preargs' and 'extra_postargs' are as for 'compile()'
(except of course that they supply command-line arguments
for the particular linker being used).
Raises LinkError on failure."""
"""Link a bunch of stuff together to create a shared library file.
Similar semantics to 'create_static_lib()', with the addition of
other libraries to link against and directories to search for them.
Also, of course, the type and name of the generated file will
almost certainly be different, as will the program used to create
it.
'libraries' is a list of libraries to link against. These are
library names, not filenames, since they're translated into
filenames in a platform-specific way (eg. "foo" becomes "libfoo.a"
on Unix and "foo.lib" on DOS/Windows). However, they can include a
directory component, which means the linker will look in that
specific directory rather than searching all the normal locations.
'library_dirs', if supplied, should be a list of directories to
search for libraries that were specified as bare library names
(ie. no directory component). These are on top of the system
default and those supplied to 'add_library_dir()' and/or
'set_library_dirs()'. 'runtime_library_dirs' is a list of
directories that will be embedded into the shared library and used
to search for other shared libraries that *it* depends on at
run-time. (This may only be relevant on Unix.)
'export_symbols' is a list of symbols that the shared library will
export. (This appears to be relevant only on Windows.)
'debug' is as for 'compile()' and 'create_static_lib()', with the
slight distinction that it actually matters on most platforms (as
opposed to 'create_static_lib()', which includes a 'debug' flag
mostly for form's sake).
'extra_preargs' and 'extra_postargs' are as for 'compile()' (except
of course that they supply command-line arguments for the
particular linker being used).
Raises LinkError on failure.
"""
pass
......@@ -569,14 +570,15 @@ class CCompiler:
debug=0,
extra_preargs=None,
extra_postargs=None):
"""Link a bunch of stuff together to create a shared object
file. Much like 'link_shared_lib()', except the output filename
is explicitly supplied as 'output_filename'. If 'output_dir' is
supplied, 'output_filename' is relative to it
(i.e. 'output_filename' can provide directory components if
needed).
Raises LinkError on failure."""
"""Link a bunch of stuff together to create a shared object file.
Much like 'link_shared_lib()', except the output filename is
explicitly supplied as 'output_filename'. If 'output_dir' is
supplied, 'output_filename' is relative to it
(i.e. 'output_filename' can provide directory components if
needed).
Raises LinkError on failure.
"""
pass
......@@ -591,12 +593,13 @@ class CCompiler:
extra_preargs=None,
extra_postargs=None):
"""Link a bunch of stuff together to create a binary executable
file. The "bunch of stuff" is as for 'link_shared_lib()'.
'output_progname' should be the base name of the executable
program--e.g. on Unix the same as the output filename, but
on DOS/Windows ".exe" will be appended.
file. The "bunch of stuff" is as for 'link_shared_lib()'.
'output_progname' should be the base name of the executable
program--e.g. on Unix the same as the output filename, but on
DOS/Windows ".exe" will be appended.
Raises LinkError on failure."""
Raises LinkError on failure.
"""
pass
......@@ -607,24 +610,28 @@ class CCompiler:
# implement all of these.
def library_dir_option (self, dir):
"""Return the compiler option to add 'dir' to the list of directories
searched for libraries."""
"""Return the compiler option to add 'dir' to the list of
directories searched for libraries.
"""
raise NotImplementedError
def runtime_library_dir_option (self, dir):
"""Return the compiler option to add 'dir' to the list of directories
searched for runtime libraries."""
"""Return the compiler option to add 'dir' to the list of
directories searched for runtime libraries.
"""
raise NotImplementedError
def library_option (self, lib):
"""Return the compiler option to add 'dir' to the list of libraries
linked into the shared library or executable."""
linked into the shared library or executable.
"""
raise NotImplementedError
def find_library_file (self, dirs, lib):
"""Search the specified list of directories for a static or shared
library file 'lib' and return the full path to that file. Return
None if it wasn't found in any of the specified directories."""
library file 'lib' and return the full path to that file. Return
None if it wasn't found in any of the specified directories.
"""
raise NotImplementedError
......@@ -776,18 +783,16 @@ def new_compiler (plat=None,
verbose=0,
dry_run=0,
force=0):
"""Generate an instance of some CCompiler subclass for the supplied
platform/compiler combination. 'plat' defaults to 'os.name'
(eg. 'posix', 'nt'), and 'compiler' defaults to the default
compiler for that platform. Currently only 'posix' and 'nt'
are supported, and the default compilers are "traditional Unix
interface" (UnixCCompiler class) and Visual C++ (MSVCCompiler
class). Note that it's perfectly possible to ask for a Unix
compiler object under Windows, and a Microsoft compiler object
under Unix -- if you supply a value for 'compiler', 'plat'
is ignored."""
platform/compiler combination. 'plat' defaults to 'os.name'
(eg. 'posix', 'nt'), and 'compiler' defaults to the default compiler
for that platform. Currently only 'posix' and 'nt' are supported, and
the default compilers are "traditional Unix interface" (UnixCCompiler
class) and Visual C++ (MSVCCompiler class). Note that it's perfectly
possible to ask for a Unix compiler object under Windows, and a
Microsoft compiler object under Unix -- if you supply a value for
'compiler', 'plat' is ignored.
"""
if plat is None:
plat = os.name
......@@ -820,15 +825,15 @@ def new_compiler (plat=None,
def gen_preprocess_options (macros, include_dirs):
"""Generate C pre-processor options (-D, -U, -I) as used by at
least two types of compilers: the typical Unix compiler and Visual
C++. 'macros' is the usual thing, a list of 1- or 2-tuples, where
(name,) means undefine (-U) macro 'name', and (name,value) means
define (-D) macro 'name' to 'value'. 'include_dirs' is just a list of
directory names to be added to the header file search path (-I).
Returns a list of command-line options suitable for either
Unix compilers or Visual C++."""
"""Generate C pre-processor options (-D, -U, -I) as used by at least
two types of compilers: the typical Unix compiler and Visual C++.
'macros' is the usual thing, a list of 1- or 2-tuples, where (name,)
means undefine (-U) macro 'name', and (name,value) means define (-D)
macro 'name' to 'value'. 'include_dirs' is just a list of directory
names to be added to the header file search path (-I). Returns a list
of command-line options suitable for either Unix compilers or Visual
C++.
"""
# XXX it would be nice (mainly aesthetic, and so we don't generate
# stupid-looking command lines) to go over 'macros' and eliminate
# redundant definitions/undefinitions (ie. ensure that only the
......@@ -872,12 +877,11 @@ def gen_preprocess_options (macros, include_dirs):
def gen_lib_options (compiler, library_dirs, runtime_library_dirs, libraries):
"""Generate linker options for searching library directories and
linking with specific libraries. 'libraries' and 'library_dirs'
are, respectively, lists of library names (not filenames!) and
search directories. Returns a list of command-line options suitable
for use with some compiler (depending on the two format strings
passed in)."""
linking with specific libraries. 'libraries' and 'library_dirs' are,
respectively, lists of library names (not filenames!) and search
directories. Returns a list of command-line options suitable for use
with some compiler (depending on the two format strings passed in).
"""
lib_opts = []
for dir in library_dirs:
......
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