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.
139 lines
4.2 KiB
C
139 lines
4.2 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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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "cppdefault.h"
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#ifndef NATIVE_SYSTEM_HEADER_COMPONENT
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#define NATIVE_SYSTEM_HEADER_COMPONENT 0
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#endif
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#if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT)
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# undef LOCAL_INCLUDE_DIR
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# undef NATIVE_SYSTEM_HEADER_DIR
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#else
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# undef CROSS_INCLUDE_DIR
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#endif
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const struct default_include cpp_include_defaults[]
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#ifdef INCLUDE_DEFAULTS
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= INCLUDE_DEFAULTS;
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#else
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= {
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#ifdef GPLUSPLUS_INCLUDE_DIR
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/* Pick up GNU C++ generic include files. */
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{ GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1,
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GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
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#endif
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#ifdef GPLUSPLUS_TOOL_INCLUDE_DIR
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/* Pick up GNU C++ target-dependent include files. */
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{ GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1,
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GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 },
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#endif
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#ifdef GPLUSPLUS_BACKWARD_INCLUDE_DIR
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/* Pick up GNU C++ backward and deprecated include files. */
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{ GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1,
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GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
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#endif
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#ifdef GPLUSPLUS_LIBCXX_INCLUDE_DIR
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/* Pick up libc++ include files, if we have -stdlib=libc++. */
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{ GPLUSPLUS_LIBCXX_INCLUDE_DIR, "G++", 2, 1,
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GPLUSPLUS_LIBCXX_INCLUDE_DIR_ADD_SYSROOT, 0 },
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#endif
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#ifdef GCC_INCLUDE_DIR
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/* This is the dir for gcc's private headers. */
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{ GCC_INCLUDE_DIR, "GCC", 0, 0, 0, 0 },
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#endif
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#ifdef LOCAL_INCLUDE_DIR
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/* /usr/local/include comes before the fixincluded header files. */
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{ LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 },
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{ LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },
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#endif
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#ifdef PREFIX_INCLUDE_DIR
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{ PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0 },
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#endif
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#ifdef FIXED_INCLUDE_DIR
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/* This is the dir for fixincludes. */
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{ FIXED_INCLUDE_DIR, "GCC", 0, 0, 0,
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/* A multilib suffix needs adding if different multilibs use
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different headers. */
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#ifdef SYSROOT_HEADERS_SUFFIX_SPEC
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1
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#else
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0
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#endif
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},
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#endif
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#ifdef CROSS_INCLUDE_DIR
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/* One place the target system's headers might be. */
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{ CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0 },
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#endif
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#ifdef TOOL_INCLUDE_DIR
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/* Another place the target system's headers might be. */
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{ TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0 },
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#endif
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#ifdef NATIVE_SYSTEM_HEADER_DIR
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/* /usr/include comes dead last. */
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{ NATIVE_SYSTEM_HEADER_DIR, NATIVE_SYSTEM_HEADER_COMPONENT, 0, 0, 1, 2 },
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{ NATIVE_SYSTEM_HEADER_DIR, NATIVE_SYSTEM_HEADER_COMPONENT, 0, 0, 1, 0 },
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#endif
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{ 0, 0, 0, 0, 0, 0 }
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};
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#endif /* no INCLUDE_DEFAULTS */
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#ifdef GCC_INCLUDE_DIR
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const char cpp_GCC_INCLUDE_DIR[] = GCC_INCLUDE_DIR;
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const size_t cpp_GCC_INCLUDE_DIR_len = sizeof GCC_INCLUDE_DIR - 8;
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#else
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const char cpp_GCC_INCLUDE_DIR[] = "";
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const size_t cpp_GCC_INCLUDE_DIR_len = 0;
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#endif
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/* The configured prefix. */
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const char cpp_PREFIX[] = PREFIX;
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const size_t cpp_PREFIX_len = sizeof PREFIX - 1;
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const char cpp_EXEC_PREFIX[] = STANDARD_EXEC_PREFIX;
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/* This value is set by cpp_relocated at runtime */
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const char *gcc_exec_prefix;
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/* Return true if the toolchain is relocated. */
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bool
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cpp_relocated (void)
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{
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static int relocated = -1;
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/* A relocated toolchain ignores standard include directories. */
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if (relocated == -1)
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{
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/* Check if the toolchain was relocated? */
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gcc_exec_prefix = getenv ("GCC_EXEC_PREFIX");
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if (gcc_exec_prefix)
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relocated = 1;
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else
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relocated = 0;
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}
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return relocated;
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}
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