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1609fdff16
Darwin's linker warns when we make a direct branch to code that is in a weak definition (citing that if a different implementation of the weak function is chosen by the dynamic linker this would be an error). As the analysis in the PR shows, this can happen when we have hot/ cold partitioning and there is an error path that is primarily cold but makes use of epilogue code in the hot section. In this simple case, we can easily deduce that the code is in fact safe; however that is not something we can realistically implement in the linker. Since the user-replaceable allocators are implemented using weak definitions, this is a warning that is frequently flagged up in both the testsuite and end-user code. The chosen solution here is to suppress the hot/cold partitioning for these cases (it is unlikely to impact performance much c.f. the actual allocation). PR target/112397 libstdc++-v3/ChangeLog: * configure: Regenerate. * configure.ac: Detect if we are building for Darwin. * libsupc++/Makefile.am: If we are building for Darwin, then suppress hot/cold partitioning for the array allocators. * libsupc++/Makefile.in: Regenerated. Signed-off-by: Iain Sandoe <iain@sandoe.co.uk> Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
261 lines
8.0 KiB
Makefile
261 lines
8.0 KiB
Makefile
## Makefile for the GNU C++ Support library.
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##
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## Copyright (C) 2000-2024 Free Software Foundation, Inc.
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##
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## Process this file with automake to produce Makefile.in.
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##
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## This file is part of GCC.
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##
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## GCC is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 3, or (at your option)
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## any later version.
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##
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## GCC is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with GCC; see the file COPYING3. If not see
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## <http://www.gnu.org/licenses/>.
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include $(top_srcdir)/fragment.am
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# Need this library to both be part of libstdc++.a, and installed
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# separately too.
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# 1) separate libsupc++.la
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toolexeclib_LTLIBRARIES = libsupc++.la
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# 2) integrated libsupc++convenience.la that is to be a part of libstdc++.a
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noinst_LTLIBRARIES = libsupc++convenience.la
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std_HEADERS = \
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compare cxxabi.h exception initializer_list new typeinfo
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bits_HEADERS = \
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atomic_lockfree_defines.h cxxabi_forced.h \
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exception_defines.h exception_ptr.h hash_bytes.h nested_exception.h exception.h cxxabi_init_exception.h
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headers = $(std_HEADERS) $(bits_HEADERS)
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if GLIBCXX_HOSTED
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c_sources = \
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cp-demangle.c
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endif
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sources = \
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array_type_info.cc \
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atexit_arm.cc \
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atexit_thread.cc \
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atomicity.cc \
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bad_alloc.cc \
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bad_array_length.cc \
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bad_array_new.cc \
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bad_cast.cc \
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bad_typeid.cc \
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class_type_info.cc \
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del_op.cc \
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del_ops.cc \
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del_opnt.cc \
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del_opv.cc \
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del_opvs.cc \
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del_opvnt.cc \
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dyncast.cc \
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eh_alloc.cc \
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eh_arm.cc \
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eh_aux_runtime.cc \
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eh_call.cc \
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eh_catch.cc \
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eh_exception.cc \
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eh_globals.cc \
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eh_personality.cc \
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eh_ptr.cc \
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eh_term_handler.cc \
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eh_terminate.cc \
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eh_tm.cc \
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eh_throw.cc \
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eh_type.cc \
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eh_unex_handler.cc \
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enum_type_info.cc \
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function_type_info.cc \
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fundamental_type_info.cc \
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guard.cc \
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guard_error.cc \
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hash_bytes.cc \
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nested_exception.cc \
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new_handler.cc \
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new_op.cc \
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new_opnt.cc \
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new_opv.cc \
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new_opvnt.cc \
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new_opa.cc \
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new_opant.cc \
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new_opva.cc \
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new_opvant.cc \
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del_opa.cc \
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del_opant.cc \
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del_opsa.cc \
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del_opva.cc \
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del_opvant.cc \
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del_opvsa.cc \
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pbase_type_info.cc \
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pmem_type_info.cc \
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pointer_type_info.cc \
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pure.cc \
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si_class_type_info.cc \
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tinfo.cc \
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tinfo2.cc \
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vec.cc \
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vmi_class_type_info.cc \
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vterminate.cc
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if ENABLE_VTABLE_VERIFY
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if !VTV_CYGMIN
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vtv_sources = \
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vtv_stubs.cc
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endif
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endif
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libsupc___la_SOURCES = $(sources) $(c_sources) $(vtv_sources)
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libsupc__convenience_la_SOURCES = $(sources) $(c_sources) $(vtv_sources)
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cp-demangle.c:
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rm -f $@
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$(LN_S) $(toplevel_srcdir)/libiberty/cp-demangle.c $@
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cp-demangle.lo: cp-demangle.c
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$(LTCOMPILE) -DIN_GLIBCPP_V3 -Wno-error -c $<
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cp-demangle.o: cp-demangle.c
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$(C_COMPILE) -DIN_GLIBCPP_V3 -Wno-error -c $<
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atomicity_file = ${glibcxx_srcdir}/$(ATOMICITY_SRCDIR)/atomicity.h
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atomicity.cc: ${atomicity_file}
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$(LN_S) ${atomicity_file} ./atomicity.cc || true
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if OS_IS_DARWIN
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# See PR 112397
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new_opvnt.lo: new_opvnt.cc
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$(LTCXXCOMPILE) -fno-reorder-blocks-and-partition -I. -c $<
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new_opvnt.o: new_opvnt.cc
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$(CXXCOMPILE) -fno-reorder-blocks-and-partition -I. -c $<
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endif
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# AM_CXXFLAGS needs to be in each subdirectory so that it can be
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# modified in a per-library or per-sub-library way. Need to manually
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# set this option because CONFIG_CXXFLAGS has to be after
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# OPTIMIZE_CXXFLAGS on the compile line so that -O2 can be overridden
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# as the occasion call for it.
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AM_CXXFLAGS = \
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$(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
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$(XTEMPLATE_FLAGS) $(FREESTANDING_FLAGS) $(EH_POOL_FLAGS) \
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$(WARN_CXXFLAGS) $(OPTIMIZE_CXXFLAGS) $(CONFIG_CXXFLAGS)
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AM_MAKEFLAGS = \
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"gxx_include_dir=$(gxx_include_dir)"
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# Use special rules for pulling things out of libiberty. These
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# objects should be compiled with the "C" compiler, not the C++
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# compiler, and also should not use the C++ includes.
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C_INCLUDES = -I.. -I$(toplevel_srcdir)/libiberty -I$(toplevel_srcdir)/include
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C_COMPILE = \
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$(CC) $(DEFS) $(C_INCLUDES) \
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$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) $(EXTRA_CFLAGS)
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# LTCOMPILE is copied from LTCXXCOMPILE below.
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LTCOMPILE = $(LIBTOOL) --tag CC --tag disable-shared $(LIBTOOLFLAGS) --mode=compile \
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$(CC) $(DEFS) $(C_INCLUDES) \
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$(glibcxx_lt_pic_flag) $(glibcxx_compiler_shared_flag) \
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$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) $(EXTRA_CFLAGS)
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# Libtool notes
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# 1) In general, libtool expects an argument such as `--tag=CXX' when
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# using the C++ compiler, because that will enable the settings
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# detected when C++ support was being configured. However, when no
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# such flag is given in the command line, libtool attempts to figure
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# it out by matching the compiler name in each configuration section
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# against a prefix of the command line. The problem is that, if the
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# compiler name and its initial flags stored in the libtool
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# configuration file don't match those in the command line, libtool
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# can't decide which configuration to use, and it gives up. The
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# correct solution is to add `--tag CXX' to LTCXXCOMPILE and maybe
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# CXXLINK, just after $(LIBTOOL), so that libtool doesn't have to
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# attempt to infer which configuration to use.
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#
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# The second tag argument, `--tag disable-shared` means that libtool
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# only compiles each source once, for static objects. In actuality,
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# glibcxx_lt_pic_flag and glibcxx_compiler_shared_flag are added to
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# the libtool command that is used create the object, which is
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# suitable for shared libraries. The `--tag disable-shared` must be
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# placed after --tag CXX lest things CXX undo the affect of
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# disable-shared.
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# 2) Need to explicitly set LTCXXCOMPILE so that EXTRA_CXX_FLAGS is
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# last. (That way, things like -O2 passed down from the toplevel can
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# be overridden by --enable-debug.)
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LTCXXCOMPILE = \
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$(LIBTOOL) --tag CXX --tag disable-shared \
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$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
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--mode=compile $(CXX) $(TOPLEVEL_INCLUDES) \
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$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) $(EXTRA_CXX_FLAGS)
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LTLDFLAGS = $(shell $(SHELL) $(top_srcdir)/../libtool-ldflags $(LDFLAGS))
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# 3) We'd have a problem when building the shared libstdc++ object if
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# the rules automake generates would be used. We cannot allow g++ to
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# be used since this would add -lstdc++ to the link line which of
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# course is problematic at this point. So, we get the top-level
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# directory to configure libstdc++-v3 to use gcc as the C++
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# compilation driver.
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CXXLINK = \
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$(LIBTOOL) --tag CXX --tag disable-shared \
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$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
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--mode=link $(CXX) \
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$(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@
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# Install notes
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# We have to have rules modified from the default to counteract SUN make
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# prepending each of $(*_HEADERS) with VPATH below.
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stddir = $(gxx_include_dir)
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bitsdir = $(gxx_include_dir)/bits
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install-stdHEADERS: $(std_HEADERS)
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@$(NORMAL_INSTALL)
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$(mkinstalldirs) $(DESTDIR)$(stddir)
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@list='$(std_HEADERS)'; for p in $$list; do \
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q=`echo $$p | sed -e 's,.*/,,'`; \
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if test -f "$$p"; then d= ; else d="$(srcdir)/"; fi; \
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echo " $(INSTALL_DATA) $$d$$p $(DESTDIR)$(stddir)/$$q"; \
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$(INSTALL_DATA) $$d$$p $(DESTDIR)$(stddir)/$$q; \
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done
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install-bitsHEADERS: $(bits_HEADERS)
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@$(NORMAL_INSTALL)
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$(mkinstalldirs) $(DESTDIR)$(bitsdir)
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@list='$(bits_HEADERS)'; for p in $$list; do \
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q=`echo $$p | sed -e 's,.*/,,'`; \
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if test -f "$$p"; then d= ; else d="$(srcdir)/"; fi; \
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echo " $(INSTALL_DATA) $$d$$p $(DESTDIR)$(bitsdir)/$$q"; \
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$(INSTALL_DATA) $$d$$p $(DESTDIR)$(bitsdir)/$$q; \
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done
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uninstall-stdHEADERS:
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@$(NORMAL_UNINSTALL)
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list='$(std_HEADERS)'; for p in $$list; do \
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q=`echo $$p | sed -e 's,.*/,,'`; \
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rm -f $(DESTDIR)$(stddir)/$$q; \
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done
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uninstall-bitsHEADERS:
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@$(NORMAL_UNINSTALL)
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list='$(bits_HEADERS)'; for p in $$list; do \
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q=`echo $$p | sed -e 's,.*/,,'`; \
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rm -f $(DESTDIR)$(bitsdir)/$$q; \
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done
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# By adding these files here, automake will remove them for 'make clean'
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CLEANFILES = stamp-*
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