1## Makefile for the C++17 sources of the GNU C++ Standard library. 2## 3## Copyright (C) 1997-2020 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