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# Copyright 2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import re
from portage import os
from portage.exception import InvalidData
#########################################################
# This an re-implementaion of dev-util/lafilefixer-0.5.
# rewrite_lafile() takes the contents of an lafile as a string
# It then parses the dependency_libs and inherited_linker_flags
# entries.
# We insist on dependency_libs being present. inherited_linker_flags
# is optional.
# There are strict rules about the syntax imposed by libtool's libltdl.
# See 'parse_dotla_file' and 'trim' functions in libltdl/ltdl.c.
# Note that duplicated entries of dependency_libs and inherited_linker_flags
# are ignored by libtool (last one wins), but we treat it as error (like
# lafilefixer does).
# What it does:
# * Replaces all .la files with absolut paths in dependency_libs with
# corresponding -l* and -L* entries
# (/usr/lib64/libfoo.la -> -L/usr/lib64 -lfoo)
# * Moves various flags (see flag_re below) to inherited_linker_flags,
# if such an entry was present.
# * Reorders dependency_libs such that all -R* entries precede -L* entries
# and these precede all other entries.
# * Remove duplicated entries from dependency_libs
# * Takes care that no entry to inherited_linker_flags is added that is
# already there.
#########################################################
#These regexes are used to parse the interesting entries in the la file
dep_libs_re = re.compile("dependency_libs='(?P<value>[^']*)'$")
inh_link_flags_re = re.compile("inherited_linker_flags='(?P<value>[^']*)'$")
#regexes for replacing stuff in -L entries.
#replace 'X11R6/lib' and 'local/lib' with 'lib', no idea what's this about.
X11_local_sub = re.compile("X11R6/lib|local/lib")
#get rid of the '..'
pkgconfig_sub1 = re.compile("usr/lib[^/]*/pkgconfig/\.\./\.\.")
pkgconfig_sub2 = re.compile("(?P<usrlib>usr/lib[^/]*)/pkgconfig/\.\.")
#detect flags that should go into inherited_linker_flags instead of dependency_libs
flag_re = re.compile("-mt|-mthreads|-kthread|-Kthread|-pthread|-pthreads|--thread-safe|-threads")
def _parse_lafile_contents(contents):
"""
Parses 'dependency_libs' and 'inherited_linker_flags' lines.
"""
dep_libs = None
inh_link_flags = None
for line in contents.split("\n"):
m = dep_libs_re.match(line)
if m:
if dep_libs is not None:
raise InvalidData("duplicated dependency_libs entry")
dep_libs = m.group("value")
continue
m = inh_link_flags_re.match(line)
if m:
if inh_link_flags is not None:
raise InvalidData("duplicated inherited_linker_flags entry")
inh_link_flags = m.group("value")
continue
return dep_libs, inh_link_flags
def rewrite_lafile(contents):
"""
Given the contents of an .la file, parse and fix it.
Returns a bool, string tuple.
The bool indicates if the file needs fixing.
The string contains the fixed contents if the file needs fixing.
Raises 'InvalidData' if the .la file is invalid.
"""
#Parse the 'dependency_libs' and 'inherited_linker_flags' lines.
dep_libs, inh_link_flags = \
_parse_lafile_contents(contents)
if dep_libs is None:
raise InvalidData("missing or invalid dependency_libs")
new_dep_libs = []
new_inh_link_flags = []
librpath = []
libladir = []
if inh_link_flags is not None:
new_inh_link_flags = inh_link_flags.split()
#Check entries in 'dependency_libs'.
for dep_libs_entry in dep_libs.split():
if dep_libs_entry.startswith("-l"):
#-lfoo, keep it
if dep_libs_entry not in new_dep_libs:
new_dep_libs.append(dep_libs_entry)
elif dep_libs_entry.endswith(".la"):
#Two cases:
#1) /usr/lib64/libfoo.la, turn it into -lfoo and append -L/usr/lib64 to libladir
#2) libfoo.la, keep it
dir, file = os.path.split(dep_libs_entry)
if not dir or not file.startswith("lib"):
if dep_libs_entry not in new_dep_libs:
new_dep_libs.append(dep_libs_entry)
else:
#/usr/lib64/libfoo.la -> -lfoo
lib = "-l" + file[3:-3]
if lib not in new_dep_libs:
new_dep_libs.append(lib)
#/usr/lib64/libfoo.la -> -L/usr/lib64
ladir = "-L" + dir
if ladir not in libladir:
libladir.append(ladir)
elif dep_libs_entry.startswith("-L"):
#Do some replacement magic and store them in 'libladir'.
#This allows us to place all -L entries at the beginning
#of 'dependency_libs'.
ladir = dep_libs_entry
ladir = X11_local_sub.sub("lib", ladir)
ladir = pkgconfig_sub1.sub("usr", ladir)
ladir = pkgconfig_sub2.sub("\g<usrlib>", ladir)
if ladir not in libladir:
libladir.append(ladir)
elif dep_libs_entry.startswith("-R"):
if dep_libs_entry not in librpath:
librpath.append(dep_libs_entry)
elif flag_re.match(dep_libs_entry):
#All this stuff goes into inh_link_flags, if the la file has such an entry.
#If it doesn't, they stay in 'dependency_libs'.
if inh_link_flags is not None:
if dep_libs_entry not in new_inh_link_flags:
new_inh_link_flags.append(dep_libs_entry)
else:
if dep_libs_entry not in new_dep_libs:
new_dep_libs.append(dep_libs_entry)
else:
raise InvalidData("Error: Unexpected entry '%s' in 'dependency_libs'" \
% dep_libs_entry)
#What should 'dependency_libs' and 'inherited_linker_flags' look like?
expected_dep_libs = ""
for x in (librpath, libladir, new_dep_libs):
if x:
expected_dep_libs += " " + " ".join(x)
expected_inh_link_flags = ""
if new_inh_link_flags:
expected_inh_link_flags += " " + " ".join(new_inh_link_flags)
#Don't touch the file if we don't need to, otherwise put the expected values into
#'contents' and write it into the la file.
if dep_libs == expected_dep_libs and \
(inh_link_flags is None or expected_inh_link_flags == inh_link_flags):
return False, None
contents = re.sub("dependency_libs='" + dep_libs + "'", \
"dependency_libs='" + expected_dep_libs + "'" , contents)
if inh_link_flags is not None:
contents = re.sub("inherited_linker_flags='" + inh_link_flags + "'", \
"inherited_linker_flags='" + expected_inh_link_flags + "'" , contents)
return True, contents
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