662b9c55cf
This option allows the user to specifiy alternate C++ runtime libraries, for example when a platform uses libc++ as the installed C++ runtime. We introduce the command line option: -stdlib= which is the user-facing mechanism to select the C++ runtime to be used when compiling and linking code. This is the same option spelling as that used by clang to allow the use of libstdc++. The availability (and thus function) of the option are a configure-time choice using the configuration control: --with-gxx-libcxx-include-dir= Specification of the path for the libc++ headers, enables the -stdlib= option (using the path as given), default values are set when the path is unconfigured. If --with-gxx-libcxx-include-dir is given together with --with-sysroot=, then we test to see if the include path starts with the sysroot and, if so, record the sysroot-relative component as the local path. At runtime, we prepend the sysroot that is actually active. At link time, we use the C++ runtime in force and (if that is libc++) also append the libc++abi ABI library. As for other cases, if a target sets the name pointer for the ABI library to NULL the G++ driver will omit it from the link line. gcc/ChangeLog: * configure.ac: Add gxx-libcxx-include-dir handled in the same way as the regular cxx header directory. * Makefile.in: Regenerated. * config.in: Likewise. * configure: Likewise. * cppdefault.c: Pick up libc++ headers if the option is enabled. * cppdefault.h (struct default_include): Amend comments to reflect the extended use of the cplusplus field. * incpath.c (add_standard_paths): Allow for multiple c++ header include path variants. * doc/invoke.texi: Document the -stdlib= option. gcc/c-family/ChangeLog: * c.opt: Add -stdlib= option and enumerations for libstdc++ and libc++. gcc/cp/ChangeLog: * g++spec.c (LIBCXX, LIBCXX_PROFILE, LIBCXX_STATIC): New. (LIBCXXABI, LIBCXXABI_PROFILE, LIBCXXABI_STATIC): New. (enum stdcxxlib_kind): New. (lang_specific_driver): Allow selection amongst multiple c++ runtime libraries.
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/* CPP Library.
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Copyright (C) 1986-2020 Free Software Foundation, Inc.
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Contributed by Per Bothner, 1994-95.
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Based on CCCP program by Paul Rubin, June 1986
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Adapted to ANSI C, Richard Stallman, Jan 1987
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_CPPDEFAULT_H
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#define GCC_CPPDEFAULT_H
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/* This is the default list of directories to search for include files.
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It may be overridden by the various -I and -ixxx options.
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#include "file" looks in the same directory as the current file,
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then this list.
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#include <file> just looks in this list.
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All these directories are treated as `system' include directories
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(they are not subject to pedantic warnings in some cases). */
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struct default_include
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{
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const char *const fname; /* The name of the directory. */
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const char *const component; /* The component containing the directory
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(see update_path in prefix.c) */
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const char cplusplus; /* When this is non-zero, we should only
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consider this if we're compiling C++.
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When the -stdlib option is configured, this
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may take values greater than 1 to indicate
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which C++ standard library should be
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used. */
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const char cxx_aware; /* Includes in this directory don't need to
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be wrapped in extern "C" when compiling
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C++. */
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const char add_sysroot; /* FNAME should be prefixed by
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cpp_SYSROOT. */
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const char multilib; /* FNAME should have appended
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- the multilib path specified with -imultilib
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when set to 1,
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- the multiarch path specified with
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-imultiarch, when set to 2. */
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};
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extern const struct default_include cpp_include_defaults[];
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extern const char cpp_GCC_INCLUDE_DIR[];
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extern const size_t cpp_GCC_INCLUDE_DIR_len;
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/* The configure-time prefix, i.e., the value supplied as the argument
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to --prefix=. */
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extern const char cpp_PREFIX[];
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/* The length of the configure-time prefix. */
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extern const size_t cpp_PREFIX_len;
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/* The configure-time execution prefix. This is typically the lib/gcc
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subdirectory of cpp_PREFIX. */
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extern const char cpp_EXEC_PREFIX[];
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/* The run-time execution prefix. This is typically the lib/gcc
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subdirectory of the actual installation. */
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extern const char *gcc_exec_prefix;
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/* Return true if the toolchain is relocated. */
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bool cpp_relocated (void);
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#endif /* ! GCC_CPPDEFAULT_H */
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