1 ## Makefile for the C++17 sources of the GNU C++ Standard library.
3 ## Copyright (C) 1997-2019 Free Software Foundation, Inc.
5 ## This file is part of the libstdc++ version 3 distribution.
6 ## Process this file with automake to produce Makefile.in.
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)
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.
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/>.
23 include $(top_srcdir)/fragment.am
25 # Convenience library for C++17 runtime.
26 noinst_LTLIBRARIES = libc++17convenience.la
31 extra_string_inst_sources = cow-string-inst.cc
37 extra_string_inst_sources =
41 if ENABLE_EXTERN_TEMPLATE
42 # XTEMPLATE_FLAGS = -fno-implicit-templates
46 $(extra_string_inst_sources)
59 vpath % $(top_srcdir)/src/c++17
61 libc__17convenience_la_SOURCES = $(sources) $(inst_sources)
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.
70 $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
71 $(XTEMPLATE_FLAGS) $(VTV_CXXFLAGS) \
72 $(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS) \
76 "gxx_include_dir=$(gxx_include_dir)"
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.
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
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.)
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)
110 LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
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.
119 $(LIBTOOL) --tag CXX --tag disable-shared \
120 $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
122 $(VTV_CXXLINKFLAGS) \
123 $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@