c++: Predefine __STDCPP_THREADS__ in the compiler if thread model is not single [PR63287]
The following patch predefines __STDCPP_THREADS__ macro to 1 if c++11 or later and thread model (e.g. printed by gcc -v) is not single. There are two targets not handled by this patch, those that define THREAD_MODEL_SPEC. In one case - QNX - it looks just like a mistake to me, instead of setting thread_model=posix in config.gcc it uses THREAD_MODEL_SPEC macro to set it unconditionally to posix. The other is hpux10, which uses -threads option to decide if threads are enabled or not, but that option isn't really passed to the compiler. I think that is something that really should be solved in config/pa/ instead, e.g. in the config/xxx/xxx-c.c targets usually set their own predefined macros and it could handle this, and either pass the option also to the compiler, or say predefine __STDCPP_THREADS__ if _DCE_THREADS macro is defined already (or -D_DCE_THREADS found on the command line), or whatever else. 2020-11-13 Jakub Jelinek <jakub@redhat.com> PR c++/63287 * c-cppbuiltin.c: Include configargs.h. (c_cpp_builtins): For C++11 and later if THREAD_MODEL_SPEC is not defined, predefine __STDCPP_THREADS__ to 1 unless thread_model is "single".
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@ -32,6 +32,7 @@ along with GCC; see the file COPYING3. If not see
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#include "debug.h" /* For dwarf2out_do_cfi_asm. */
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#include "common/common-target.h"
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#include "cppbuiltin.h"
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#include "configargs.h"
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#ifndef TARGET_OS_CPP_BUILTINS
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# define TARGET_OS_CPP_BUILTINS()
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@ -1034,6 +1035,12 @@ c_cpp_builtins (cpp_reader *pfile)
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cpp_define (pfile, "__cpp_threadsafe_static_init=200806L");
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if (flag_char8_t)
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cpp_define (pfile, "__cpp_char8_t=201811L");
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#ifndef THREAD_MODEL_SPEC
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/* Targets that define THREAD_MODEL_SPEC need to define
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__STDCPP_THREADS__ in their config/XXX/XXX-c.c themselves. */
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if (cxx_dialect >= cxx11 && strcmp (thread_model, "single") != 0)
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cpp_define (pfile, "__STDCPP_THREADS__=1");
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#endif
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}
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/* Note that we define this for C as well, so that we know if
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__attribute__((cleanup)) will interface with EH. */
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