[glibc/azanella/clang] conform: Replace _Static_assert with macro

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ca96e1f8ca33aa81a5b32a77600998036978636f

commit ca96e1f8ca33aa81a5b32a77600998036978636f
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Mar 29 16:06:13 2022 -0300

    conform: Replace _Static_assert with macro
    
    clang does not allow non integral constant expression in
    _Static_assert.  Replace with a macro that uses name bit-field
    where an invalid constant expression sets its size to 0, resulting
    in a error.

Diff:
---
 conform/conformtest.py | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/conform/conformtest.py b/conform/conformtest.py
index fcaab48a6c..e89fb19134 100644
--- a/conform/conformtest.py
+++ b/conform/conformtest.py
@@ -157,9 +157,9 @@ class ConstantTest(object):
                     '%s'
                     '# define conformtest_%d_value (%s)\n'
                     '#endif\n'
-                    '_Static_assert (((%s < 0) == conformtest_%d_negative) '
+                    'STATIC_ASSERT (((%s < 0) == conformtest_%d_negative) '
                     '&& (%s == conformtest_%d_value), '
-                    '"value match inside and outside #if");\n'
+                    'value_match_inside_and_outside_if);\n'
                     % (self.symbol, self.num, sym_bits_def_neg, self.num,
                        sym_bits_or_neg, self.num, sym_bits_def_pos, self.num,
                        sym_bits_or_pos, self.symbol, self.num, self.symbol,
@@ -179,8 +179,8 @@ class ConstantTest(object):
                 'Type of symbol %s' % self.symbol,
                 text))
         if self.op is not None:
-            text = ('_Static_assert (%(symbol)s %(op)s %(value)s, '
-                    '"value constraint");\n'
+            text = ('STATIC_ASSERT (%(symbol)s %(op)s %(value)s, '
+                    'value_constraint);\n'
                     % vars(self))
             self.subtests.append(CompileSubTest(
                 'Value of symbol %s' % self.symbol,
@@ -552,6 +552,16 @@ class HeaderTests(object):
         self.skipped += 1
         sys.stdout.flush()
 
+    def common_definitions(self):
+        """Add any required common definition for the compilation tests."""
+        text = ('#define __STR(pre,post) pre ## post\n'
+                '#define _STR(pre,post) __STR(pre, post)\n'
+                '#define STATIC_ASSERT(cond, msg) \\\n'
+                '  typedef struct {\\\n'
+                '    int _STR (static_assertion_failed_, msg) : !!(cond);\\\n'
+                '  } _STR (static_assertion_failed_, __COUNTER__)\n')
+        return text
+
     def compile_test(self, name, text):
         """Run a compilation test; return True if it passes."""
         self.total += 1
@@ -565,7 +575,8 @@ class HeaderTests(object):
         c_file = os.path.join(self.temp_dir, 'test.c')
         o_file = os.path.join(self.temp_dir, 'test.o')
         with open(c_file, 'w') as c_file_out:
-            c_file_out.write('#include <%s>\n%s' % (self.header, text))
+            c_file_out.write('#include <%s>\n%s\n%s' %
+                    (self.header, self.common_definitions(), text))
         cmd = ('%s %s -c %s -o %s' % (self.cc, self.cflags, c_file, o_file))
         try:
             subprocess.check_call(cmd, shell=True)