conform: Do not use __SIG_ATOMIC_TYPE__

clang does not define __SIG_ATOMIC_TYPE__, instead add another
directive ('size:') which instruct to use an integer type of
defined minimum size.

Reviewed-by: Sam James <sam@gentoo.org>

conform/conformtest.py

@@ -172,6 +172,10 @@ def gen_subtests(self):
                 c_type = self.c_type[len('promoted:'):]
                 text = ('__typeof__ ((%s) 0 + (%s) 0) a2_%d;\n'
                         % (c_type, c_type, self.num))
+            elif self.c_type.startswith('size:'):
+                c_type = "int{}_t".format(self.c_type[len('size:'):])
+                text = ('__typeof__ ((%s) 0 + (%s) 0) a2_%d;\n'
+                        % (c_type, c_type, self.num))
             else:
                 text = '__typeof__ ((%s) 0) a2_%d;\n' % (self.c_type, self.num)
             text += 'extern __typeof__ (%s) a2_%d;\n' % (self.symbol, self.num)

conform/data/stdint.h-data

@@ -88,8 +88,8 @@ macro-int-constant UINTMAX_MAX {promoted:uintmax_t} >= 18446744073709551615ULL
 macro-int-constant PTRDIFF_MIN {promoted:__PTRDIFF_TYPE__} <= -65535
 macro-int-constant PTRDIFF_MAX {promoted:__PTRDIFF_TYPE__} >= 65535
 
-macro-int-constant SIG_ATOMIC_MIN {promoted:__SIG_ATOMIC_TYPE__}
-macro-int-constant SIG_ATOMIC_MAX {promoted:__SIG_ATOMIC_TYPE__} >= 127
+macro-int-constant SIG_ATOMIC_MIN {size:__SIG_ATOMIC_WIDTH__}
+macro-int-constant SIG_ATOMIC_MAX {size:__SIG_ATOMIC_WIDTH__} >= 127
 
 macro-int-constant SIZE_MAX {promoted:__SIZE_TYPE__} >= 65535