[gcc r10-10706] c-family: Initialize ridpointers for __int128 etc. [PR105186]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:73f5db083a73c6125e0203ea50c4d1f0a1c6421a

commit r10-10706-g73f5db083a73c6125e0203ea50c4d1f0a1c6421a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Mon Apr 11 10:41:07 2022 +0200

    c-family: Initialize ridpointers for __int128 etc. [PR105186]
    
    The following testcase ICEs with C++ and is incorrectly rejected with C.
    The reason is that both FEs use ridpointers identifiers for CPP_KEYWORD
    and value or u.value for CPP_NAME e.g. when parsing attributes or OpenMP
    directives etc., like:
             /* Save away the identifier that indicates which attribute
                this is.  */
             identifier = (token->type == CPP_KEYWORD)
               /* For keywords, use the canonical spelling, not the
                  parsed identifier.  */
               ? ridpointers[(int) token->keyword]
               : id_token->u.value;
    
             identifier = canonicalize_attr_name (identifier);
    I've tried to change those to use ridpointers only if non-NULL and otherwise
    use the value/u.value even for CPP_KEYWORDS, but that was a large 10 hunks
    patch.
    
    The following patch instead just initializes ridpointers for the __intNN
    keywords.  It can't be done earlier before we record_builtin_type as there
    are 2 different spellings and if we initialize those ridpointers early, the
    second record_builtin_type fails miserably.
    
    2022-04-11  Jakub Jelinek  <jakub@redhat.com>
    
            PR c++/105186
            * c-common.c (c_common_nodes_and_builtins): After registering __int%d
            and __int%d__ builtin types, initialize corresponding ridpointers
            entry.
    
            * c-c++-common/pr105186.c: New test.
    
    (cherry picked from commit 083e8e66d2e90992fa83a53bfc3553dfa91abda1)

Diff:
---
 gcc/c-family/c-common.c               | 2 ++
 gcc/testsuite/c-c++-common/pr105186.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index ad8bdc34a56..8105a27ab56 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -4031,6 +4031,8 @@ c_common_nodes_and_builtins (void)
       sprintf (name, "__int%d__", int_n_data[i].bitsize);
       record_builtin_type ((enum rid)(RID_FIRST_INT_N + i), name,
 			   int_n_trees[i].signed_type);
+      ridpointers[RID_FIRST_INT_N + i]
+	= DECL_NAME (TYPE_NAME (int_n_trees[i].signed_type));
 
       sprintf (name, "__int%d unsigned", int_n_data[i].bitsize);
       record_builtin_type (RID_MAX, name, int_n_trees[i].unsigned_type);
diff --git a/gcc/testsuite/c-c++-common/pr105186.c b/gcc/testsuite/c-c++-common/pr105186.c
new file mode 100644
index 00000000000..ea687eacc4c
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr105186.c
@@ -0,0 +1,5 @@
+/* PR c++/105186 */
+/* { dg-do compile } */
+
+__attribute__((__int128)) int i;	/* { dg-warning "'__int128' attribute directive ignored" } */
+__attribute__((__int128__)) int j;	/* { dg-warning "'__int128' attribute directive ignored" } */