libstdc++-v3/src/c++23/Makefile.am

   1 ## Makefile for the C++23 sources of the GNU C++ Standard library.
   2 ##
   3 ## Copyright (C) 1997-2024 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
  23 include $(top_srcdir)/fragment.am
  24
  25 # Convenience library for C++23 runtime.
  26 noinst_LTLIBRARIES = libc++23convenience.la
  27
  28 headers =
  29
  30 if ENABLE_EXTERN_TEMPLATE
  31 # XTEMPLATE_FLAGS = -fno-implicit-templates
  32 inst_sources =
  33 else
  34 # XTEMPLATE_FLAGS =
  35 inst_sources =
  36 endif
  37
  38 sources = stacktrace.cc print.cc
  39
  40 vpath % $(top_srcdir)/src/c++23
  41
  42
  43 if GLIBCXX_HOSTED
  44 libc__23convenience_la_SOURCES = $(sources)  $(inst_sources)
  45 else
  46 libc__23convenience_la_SOURCES =
  47 endif
  48
  49 # Use C++26 so that std::filebuf::native_handle() is available.
  50 print.lo: print.cc
  51         $(LTCXXCOMPILE) -std=gnu++26 -c $<
  52 print.o: print.cc
  53         $(CXXCOMPILE) -std=gnu++26 -c $<
  54
  55 # AM_CXXFLAGS needs to be in each subdirectory so that it can be
  56 # modified in a per-library or per-sub-library way.  Need to manually
  57 # set this option because CONFIG_CXXFLAGS has to be after
  58 # OPTIMIZE_CXXFLAGS on the compile line so that -O2 can be overridden
  59 # as the occasion calls for it.
  60 AM_CXXFLAGS = \
  61         -std=gnu++23 \
  62         $(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
  63         $(XTEMPLATE_FLAGS) $(VTV_CXXFLAGS) \
  64         $(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS) \
  65         -fimplicit-templates
  66
  67 AM_MAKEFLAGS = \
  68         "gxx_include_dir=$(gxx_include_dir)"
  69
  70 # Libtool notes
  71
  72 # 1) In general, libtool expects an argument such as `--tag=CXX' when
  73 # using the C++ compiler, because that will enable the settings
  74 # detected when C++ support was being configured.  However, when no
  75 # such flag is given in the command line, libtool attempts to figure
  76 # it out by matching the compiler name in each configuration section
  77 # against a prefix of the command line.  The problem is that, if the
  78 # compiler name and its initial flags stored in the libtool
  79 # configuration file don't match those in the command line, libtool
  80 # can't decide which configuration to use, and it gives up.  The
  81 # correct solution is to add `--tag CXX' to LTCXXCOMPILE and maybe
  82 # CXXLINK, just after $(LIBTOOL), so that libtool doesn't have to
  83 # attempt to infer which configuration to use.
  84 #
  85 # The second tag argument, `--tag disable-shared` means that libtool
  86 # only compiles each source once, for static objects. In actuality,
  87 # glibcxx_lt_pic_flag and glibcxx_compiler_shared_flag are added to
  88 # the libtool command that is used create the object, which is
  89 # suitable for shared libraries.  The `--tag disable-shared` must be
  90 # placed after --tag CXX lest things CXX undo the affect of
  91 # disable-shared.
  92
  93 # 2) Need to explicitly set LTCXXCOMPILE so that EXTRA_CXX_FLAGS is
  94 # last. (That way, things like -O2 passed down from the toplevel can
  95 # be overridden by --enable-debug.)
  96 LTCXXCOMPILE = \
  97         $(LIBTOOL) --tag CXX --tag disable-shared \
  98         $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
  99         --mode=compile $(CXX) $(TOPLEVEL_INCLUDES) \
 100         $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) $(EXTRA_CXX_FLAGS)
 101
 102 LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
 103
 104 # 3) We'd have a problem when building the shared libstdc++ object if
 105 # the rules automake generates would be used.  We cannot allow g++ to
 106 # be used since this would add -lstdc++ to the link line which of
 107 # course is problematic at this point.  So, we get the top-level
 108 # directory to configure libstdc++-v3 to use gcc as the C++
 109 # compilation driver.
 110 CXXLINK = \
 111         $(LIBTOOL) --tag CXX --tag disable-shared \
 112         $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 113         --mode=link $(CXX) \
 114         $(VTV_CXXLINKFLAGS) \
 115         $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@