1 ## Makefile for the C++17 sources of the GNU C++ Standard library.
3 ## Copyright (C) 1997-2023 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)
53 floating_from_chars.cc \
54 floating_to_chars.cc \
61 vpath % $(top_srcdir)/src/c++17
63 libc__17convenience_la_SOURCES = $(sources) $(inst_sources)
65 if GLIBCXX_LDBL_ALT128_COMPAT
66 floating_from_chars.lo: floating_from_chars.cc
67 $(LTCXXCOMPILE) -mabi=ibmlongdouble $(LONG_DOUBLE_128_FLAGS) -c $<
68 floating_from_chars.o: floating_from_chars.cc
69 $(CXXCOMPILE) -mabi=ibmlongdouble $(LONG_DOUBLE_128_FLAGS) -c $<
70 floating_to_chars.lo: floating_to_chars.cc
71 $(LTCXXCOMPILE) -mabi=ibmlongdouble $(LONG_DOUBLE_128_FLAGS) -c $<
72 floating_to_chars.o: floating_to_chars.cc
73 $(CXXCOMPILE) -mabi=ibmlongdouble $(LONG_DOUBLE_128_FLAGS) -c $<
76 # AM_CXXFLAGS needs to be in each subdirectory so that it can be
77 # modified in a per-library or per-sub-library way. Need to manually
78 # set this option because CONFIG_CXXFLAGS has to be after
79 # OPTIMIZE_CXXFLAGS on the compile line so that -O2 can be overridden
80 # as the occasion calls for it.
82 -std=gnu++17 -nostdinc++ \
83 $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
84 $(XTEMPLATE_FLAGS) $(VTV_CXXFLAGS) \
85 $(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS) \
89 "gxx_include_dir=$(gxx_include_dir)"
93 # 1) In general, libtool expects an argument such as `--tag=CXX' when
94 # using the C++ compiler, because that will enable the settings
95 # detected when C++ support was being configured. However, when no
96 # such flag is given in the command line, libtool attempts to figure
97 # it out by matching the compiler name in each configuration section
98 # against a prefix of the command line. The problem is that, if the
99 # compiler name and its initial flags stored in the libtool
100 # configuration file don't match those in the command line, libtool
101 # can't decide which configuration to use, and it gives up. The
102 # correct solution is to add `--tag CXX' to LTCXXCOMPILE and maybe
103 # CXXLINK, just after $(LIBTOOL), so that libtool doesn't have to
104 # attempt to infer which configuration to use.
106 # The second tag argument, `--tag disable-shared` means that libtool
107 # only compiles each source once, for static objects. In actuality,
108 # glibcxx_lt_pic_flag and glibcxx_compiler_shared_flag are added to
109 # the libtool command that is used create the object, which is
110 # suitable for shared libraries. The `--tag disable-shared` must be
111 # placed after --tag CXX lest things CXX undo the affect of
114 # 2) Need to explicitly set LTCXXCOMPILE so that EXTRA_CXX_FLAGS is
115 # last. (That way, things like -O2 passed down from the toplevel can
116 # be overridden by --enable-debug.)
118 $(LIBTOOL) --tag CXX --tag disable-shared \
119 $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
120 --mode=compile $(CXX) $(TOPLEVEL_INCLUDES) \
121 $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) $(EXTRA_CXX_FLAGS)
123 LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
125 # 3) We'd have a problem when building the shared libstdc++ object if
126 # the rules automake generates would be used. We cannot allow g++ to
127 # be used since this would add -lstdc++ to the link line which of
128 # course is problematic at this point. So, we get the top-level
129 # directory to configure libstdc++-v3 to use gcc as the C++
130 # compilation driver.
132 $(LIBTOOL) --tag CXX --tag disable-shared \
133 $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
135 $(VTV_CXXLINKFLAGS) \
136 $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@