libstdc++-v3/src/filesystem/Makefile.am

   1 ## Makefile for the GNU C++ Filesystem library.
   2 ##
   3 ## Copyright (C) 2014-2020 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
  23 include $(top_srcdir)/fragment.am
  24
  25 toolexeclib_LTLIBRARIES = libstdc++fs.la
  26
  27 headers =
  28
  29 if ENABLE_DUAL_ABI
  30 cxx11_abi_sources = \
  31         cow-dir.cc \
  32         cow-ops.cc \
  33         cow-path.cc
  34 else
  35 cxx11_abi_sources =
  36 endif
  37
  38 sources = \
  39         dir.cc \
  40         ops.cc \
  41         path.cc \
  42         ${cxx11_abi_sources}
  43
  44 # vpath % $(top_srcdir)/src/filesystem
  45
  46 libstdc__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.
  53 AM_CXXFLAGS = \
  54         $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
  55         -std=gnu++17 \
  56         $(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS)  $(CONFIG_CXXFLAGS)
  57
  58 AM_MAKEFLAGS = \
  59         "gxx_include_dir=$(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.)
  88 LTCXXCOMPILE = \
  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
  94 LTLDFLAGS = $(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.
 102 CXXLINK = \
 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'
 109 CLEANFILES = stamp-*
 110