Currently, using the ISO version of C and C++ will disable the
OpenMP and OpenACC intrinsics, which is rather surprising. The
reason is that those imply -fno-nonansi-builtins and the
OpenMP/OpenACC are marked as non-ansi builtins.
While the latter is true, -fopenmp/-fopenacc seems to be rather
orthogonal and should be regarded as category of their own,
uneffected by -std=c23 vs. -std=gnu23 or -std=c++23 vs. -std=gnu++23.
Comments before I commit this patch?
Tobias
builtins.def: Enable OpenMP/OpenACC builtins also with -fno-nonansi-builtins
The -std=c.. and -std=c++.. imply -fno-nonansi-builtins, which disabled the
OpenMP/OpenACC intrinsics - but -fopenmp/-fopenacc builtin use should be
rather othogonal to the user's choice between -std=c... and -std=gnuc...
gcc/ChangeLog:
* builtins.def (DEF_GOACC_BUILTIN_COMPILER, DEF_GOMP_BUILTIN_COMPILER):
Set NONANSI_P = false to enable those also with -fno-nonansi-builtins.
diff --git a/gcc/builtins.def b/gcc/builtins.def
index fdcad54a5d7..825e7598d37 100644
--- a/gcc/builtins.def
+++ b/gcc/builtins.def
@@ -217,6 +217,8 @@ along with GCC; see the file COPYING3. If not see
DEF_BUILTIN (ENUM, "__builtin_" NAME, BUILT_IN_NORMAL, TYPE, TYPE, \
false, true, true, ATTRS, false, \
flag_openacc)
+/* Set NONANSI_P = false to enable the builtins also with -fno-nonansi-builtins
+ as -std=c++23 (which implies the former) and -fopenacc should be othogonal. */
#undef DEF_GOACC_BUILTIN_COMPILER
#define DEF_GOACC_BUILTIN_COMPILER(ENUM, NAME, TYPE, ATTRS) \
DEF_BUILTIN (ENUM, "__builtin_" NAME, BUILT_IN_NORMAL, TYPE, TYPE, \
@@ -232,10 +234,12 @@ along with GCC; see the file COPYING3. If not see
(flag_openacc \
|| flag_openmp \
|| flag_tree_parallelize_loops > 1))
+/* Set NONANSI_P = false to enable the builtins also with -fno-nonansi-builtins
+ as -std=c++23 (which implies the former) and -fopenmp should be othogonal. */
#undef DEF_GOMP_BUILTIN_COMPILER
#define DEF_GOMP_BUILTIN_COMPILER(ENUM, NAME, TYPE, ATTRS) \
DEF_BUILTIN (ENUM, "__builtin_" NAME, BUILT_IN_NORMAL, TYPE, TYPE, \
- flag_openmp, true, true, ATTRS, false, flag_openmp)
+ flag_openmp, true, false, ATTRS, false, flag_openmp)
/* Builtin used by the implementation of GNU TM. These
functions are mapped to the actual implementation of the STM library. */
