1## Makefile for the GNU C++ Filesystem library.
2##
3## Copyright (C) 2014-2019 Free Software Foundation, Inc.
4##
5## Process this file with automake to produce Makefile.in.
6##
7## This file is part of GCC.
8##
9## GCC is free software; you can redistribute it and/or modify
10## it under the terms of the GNU General Public License as published by
11## the Free Software Foundation; either version 3, or (at your option)
12## any later version.
13##
14## GCC is distributed in the hope that it will be useful,
15## but WITHOUT ANY WARRANTY; without even the implied warranty of
16## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17## GNU General Public License for more details.
18##
19## You should have received a copy of the GNU General Public License
20## along with GCC; see the file COPYING3.  If not see
21## <http://www.gnu.org/licenses/>.
22
23include $(top_srcdir)/fragment.am
24
25toolexeclib_LTLIBRARIES = libstdc++fs.la
26
27headers =
28
29if ENABLE_DUAL_ABI
30cxx11_abi_sources = \
31	cow-dir.cc \
32	cow-ops.cc \
33	cow-path.cc
34else
35cxx11_abi_sources =
36endif
37
38sources = \
39	dir.cc \
40	ops.cc \
41	path.cc \
42	${cxx11_abi_sources}
43
44# vpath % $(top_srcdir)/src/filesystem
45
46libstdc__fs_la_SOURCES = $(sources)
47
48# AM_CXXFLAGS needs to be in each subdirectory so that it can be
49# modified in a per-library or per-sub-library way.  Need to manually
50# set this option because CONFIG_CXXFLAGS has to be after
51# OPTIMIZE_CXXFLAGS on the compile line so that -O2 can be overridden
52# as the occasion call for it.
53AM_CXXFLAGS = \
54	$(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
55	-std=gnu++17 \
56	$(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS)  $(CONFIG_CXXFLAGS)
57
58AM_MAKEFLAGS = \
59	"gxx_include_dir=$(gxx_include_dir)"
60
61
62# Libtool notes
63
64# 1) In general, libtool expects an argument such as `--tag=CXX' when
65# using the C++ compiler, because that will enable the settings
66# detected when C++ support was being configured.  However, when no
67# such flag is given in the command line, libtool attempts to figure
68# it out by matching the compiler name in each configuration section
69# against a prefix of the command line.  The problem is that, if the
70# compiler name and its initial flags stored in the libtool
71# configuration file don't match those in the command line, libtool
72# can't decide which configuration to use, and it gives up.  The
73# correct solution is to add `--tag CXX' to LTCXXCOMPILE and maybe
74# CXXLINK, just after $(LIBTOOL), so that libtool doesn't have to
75# attempt to infer which configuration to use.
76#
77# The second tag argument, `--tag disable-shared` means that libtool
78# only compiles each source once, for static objects. In actuality,
79# glibcxx_lt_pic_flag and glibcxx_compiler_shared_flag are added to
80# the libtool command that is used create the object, which is
81# suitable for shared libraries.  The `--tag disable-shared` must be
82# placed after --tag CXX lest things CXX undo the affect of
83# disable-shared.
84
85# 2) Need to explicitly set LTCXXCOMPILE so that EXTRA_CXX_FLAGS is
86# last. (That way, things like -O2 passed down from the toplevel can
87# be overridden by --enable-debug.)
88LTCXXCOMPILE = \
89	$(LIBTOOL) --tag CXX --tag disable-shared \
90	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
91	--mode=compile $(CXX) $(TOPLEVEL_INCLUDES) \
92	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) $(EXTRA_CXX_FLAGS)
93
94LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
95
96# 3) We'd have a problem when building the shared libstdc++ object if
97# the rules automake generates would be used.  We cannot allow g++ to
98# be used since this would add -lstdc++ to the link line which of
99# course is problematic at this point.  So, we get the top-level
100# directory to configure libstdc++-v3 to use gcc as the C++
101# compilation driver.
102CXXLINK = \
103	$(LIBTOOL) --tag CXX --tag disable-shared \
104	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
105	--mode=link $(CXX) \
106	$(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@
107
108# By adding these files here, automake will remove them for 'make clean'
109CLEANFILES = stamp-*
110
111