1## Makefile for the C++17 sources of the GNU C++ Standard library.
2##
3## Copyright (C) 1997-2019 Free Software Foundation, Inc.
4##
5## This file is part of the libstdc++ version 3 distribution.
6## Process this file with automake to produce Makefile.in.
7
8## This file is part of the GNU ISO C++ Library.  This library is free
9## software; you can redistribute it and/or modify it under the
10## terms of the GNU General Public License as published by the
11## Free Software Foundation; either version 3, or (at your option)
12## any later version.
13
14## This library 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 along
20## with this library; see the file COPYING3.  If not see
21## <http://www.gnu.org/licenses/>.
22
23include $(top_srcdir)/fragment.am
24
25# Convenience library for C++17 runtime.
26noinst_LTLIBRARIES = libc++17convenience.la
27
28headers =
29
30if ENABLE_DUAL_ABI
31extra_string_inst_sources = cow-string-inst.cc
32extra_fs_sources = \
33	cow-fs_dir.cc \
34	cow-fs_ops.cc \
35	cow-fs_path.cc
36else
37extra_string_inst_sources =
38extra_fs_sources =
39endif
40
41if ENABLE_EXTERN_TEMPLATE
42# XTEMPLATE_FLAGS = -fno-implicit-templates
43inst_sources = \
44	ostream-inst.cc \
45	string-inst.cc \
46	$(extra_string_inst_sources)
47else
48# XTEMPLATE_FLAGS =
49inst_sources =
50endif
51
52sources = \
53	fs_dir.cc \
54	fs_ops.cc \
55	fs_path.cc \
56	memory_resource.cc \
57	$(extra_fs_sources)
58
59vpath % $(top_srcdir)/src/c++17
60
61libc__17convenience_la_SOURCES = $(sources)  $(inst_sources)
62
63# AM_CXXFLAGS needs to be in each subdirectory so that it can be
64# modified in a per-library or per-sub-library way.  Need to manually
65# set this option because CONFIG_CXXFLAGS has to be after
66# OPTIMIZE_CXXFLAGS on the compile line so that -O2 can be overridden
67# as the occasion calls for it.
68AM_CXXFLAGS = \
69	-std=gnu++17 \
70	$(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
71	$(XTEMPLATE_FLAGS) $(VTV_CXXFLAGS) \
72	$(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS) \
73	-fimplicit-templates
74
75AM_MAKEFLAGS = \
76	"gxx_include_dir=$(gxx_include_dir)"
77
78# Libtool notes
79
80# 1) In general, libtool expects an argument such as `--tag=CXX' when
81# using the C++ compiler, because that will enable the settings
82# detected when C++ support was being configured.  However, when no
83# such flag is given in the command line, libtool attempts to figure
84# it out by matching the compiler name in each configuration section
85# against a prefix of the command line.  The problem is that, if the
86# compiler name and its initial flags stored in the libtool
87# configuration file don't match those in the command line, libtool
88# can't decide which configuration to use, and it gives up.  The
89# correct solution is to add `--tag CXX' to LTCXXCOMPILE and maybe
90# CXXLINK, just after $(LIBTOOL), so that libtool doesn't have to
91# attempt to infer which configuration to use.
92#
93# The second tag argument, `--tag disable-shared` means that libtool
94# only compiles each source once, for static objects. In actuality,
95# glibcxx_lt_pic_flag and glibcxx_compiler_shared_flag are added to
96# the libtool command that is used create the object, which is
97# suitable for shared libraries.  The `--tag disable-shared` must be
98# placed after --tag CXX lest things CXX undo the affect of
99# disable-shared.
100
101# 2) Need to explicitly set LTCXXCOMPILE so that EXTRA_CXX_FLAGS is
102# last. (That way, things like -O2 passed down from the toplevel can
103# be overridden by --enable-debug.)
104LTCXXCOMPILE = \
105	$(LIBTOOL) --tag CXX --tag disable-shared \
106	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
107	--mode=compile $(CXX) $(TOPLEVEL_INCLUDES) \
108	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) $(EXTRA_CXX_FLAGS)
109
110LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
111
112# 3) We'd have a problem when building the shared libstdc++ object if
113# the rules automake generates would be used.  We cannot allow g++ to
114# be used since this would add -lstdc++ to the link line which of
115# course is problematic at this point.  So, we get the top-level
116# directory to configure libstdc++-v3 to use gcc as the C++
117# compilation driver.
118CXXLINK = \
119	$(LIBTOOL) --tag CXX --tag disable-shared \
120	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
121	--mode=link $(CXX) \
122	$(VTV_CXXLINKFLAGS) \
123	$(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@
124