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c++: Predefine __STDCPP_THREADS__ in the compiler if thread model is not single [PR63287]

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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".
This commit is contained in:
Jakub Jelinek 2020-11-13 23:23:33 +01:00
parent ccd56db898
commit 1d9a8675d3
1 changed files with 7 additions and 0 deletions
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7
gcc/c-family/c-cppbuiltin.c
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@ -32,6 +32,7 @@ along with GCC; see the file COPYING3. If not see
#include "debug.h" /* For dwarf2out_do_cfi_asm. */
#include "common/common-target.h"
#include "cppbuiltin.h"
#include "configargs.h"
#ifndef TARGET_OS_CPP_BUILTINS
# define TARGET_OS_CPP_BUILTINS()
@ -1034,6 +1035,12 @@ c_cpp_builtins (cpp_reader *pfile)
cpp_define (pfile, "__cpp_threadsafe_static_init=200806L");
if (flag_char8_t)
cpp_define (pfile, "__cpp_char8_t=201811L");
#ifndef THREAD_MODEL_SPEC
/* Targets that define THREAD_MODEL_SPEC need to define
__STDCPP_THREADS__ in their config/XXX/XXX-c.c themselves. */
if (cxx_dialect >= cxx11 && strcmp (thread_model, "single") != 0)
cpp_define (pfile, "__STDCPP_THREADS__=1");
#endif
}
/* Note that we define this for C as well, so that we know if
__attribute__((cleanup)) will interface with EH. */