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c-decl.c (locate_old_decl): If a previous conflicting decl is both explicit and builtin... 

* c-decl.c (locate_old_decl): If a previous conflicting decl is
both explicit and builtin, print the location of the explicit one.

* gcc.dg/mismatch-decl-1.c: New test.

From-SVN: r204491
This commit is contained in:
DJ Delorie 2013-11-06 18:33:33 -05:00 committed by DJ Delorie
parent 7f4d640cd9
commit 0c249d4b1d
4 changed files with 33 additions and 1 deletions
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5
gcc/c/ChangeLog
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@ -1,3 +1,8 @@
2013-11-06 DJ Delorie <dj@redhat.com>
* c-decl.c (locate_old_decl): If a previous conflicting decl is
both explicit and builtin, print the location of the explicit one.
2013-11-05 Tobias Burnus <burnus@net-b.de>
* c-parser.c (c_parser_omp_for, c_parser_omp_parallel,

3
gcc/c/c-decl.c
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@ -1634,7 +1634,8 @@ validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
static void
locate_old_decl (tree decl)
{
if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)
&& !C_DECL_DECLARED_BUILTIN (decl))
;
else if (DECL_INITIAL (decl))
inform (input_location, "previous definition of %q+D was here", decl);

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2013-11-06 DJ Delorie <dj@redhat.com>
* gcc.dg/mismatch-decl-1.c: New test.
2013-11-06 Joseph Myers <joseph@codesourcery.com>
* gcc.dg/torture/float128-cmp-invalid.c,

22
gcc/testsuite/gcc.dg/mismatch-decl-1.c Normal file
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@ -0,0 +1,22 @@
/* This test assumes -fbuiltin and not -fansi to get "index" and "memchr" builtin DECLs. */
/* { dg-do compile } */
/* { dg-options "" } */
/* The bug this is testing is that if a new decl conflicts with an
explicit decl, you don't get the "changes type of builtin" message,
but if there was *also* a builtin, you *also* don't get the
"previous declaration was here" message, leaving you with no clue
where the previous declaration came from. */
extern char foo(int,int); /* { dg-message "previous declaration of 'foo' was here" } */
extern char *index(const char *,int); /* { dg-message "previous declaration of 'index' was here" } */
/* This changes the type of "index", which is both a builtin and an
explicit decl. */
int index; /* { dg-error "redeclared as different kind of symbol" } */
/* This changes the type of "memchr", which is only a builtin. */
int memchr; /* { dg-warning "built-in function 'memchr' declared as non-function" } */
/* This changes the type of "foo", which is only an explicit decl. */
int foo; /* { dg-error "redeclared as different kind of symbol" } */