From d489ec082ea214109ff54071410f8cd00344e654 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 29 Jun 2022 23:41:46 +0100
Subject: [PATCH] c-family: Add <time.h> names to diagnostics for known headers

gcc/c-family/ChangeLog:

	* known-headers.cc (get_stdlib_header_for_name): Add <time.h>
	names.

gcc/testsuite/ChangeLog:

	* g++.dg/spellcheck-stdlib.C: Check <ctime> types and functions.
---
 gcc/c-family/known-headers.cc            | 14 ++++++++++++
 gcc/testsuite/g++.dg/spellcheck-stdlib.C | 29 ++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/gcc/c-family/known-headers.cc b/gcc/c-family/known-headers.cc
index 01c86b27dc86..9c256173b825 100644
--- a/gcc/c-family/known-headers.cc
+++ b/gcc/c-family/known-headers.cc
@@ -199,6 +199,20 @@ get_stdlib_header_for_name (const char *name, enum stdlib lib)
     {"WINT_MAX", {"<stdint.h>", "<cstdint>"} },
     {"WINT_MIN", {"<stdint.h>", "<cstdint>"} },
 
+    /* <time.h>.  */
+    {"asctime", {"<time.h>", "<ctime>"} },
+    {"clock", {"<time.h>", "<ctime>"} },
+    {"clock_t", {"<time.h>", "<ctime>"} },
+    {"ctime", {"<time.h>", "<ctime>"} },
+    {"difftime", {"<time.h>", "<ctime>"} },
+    {"gmtime", {"<time.h>", "<ctime>"} },
+    {"localtime", {"<time.h>", "<ctime>"} },
+    {"mktime", {"<time.h>", "<ctime>"} },
+    {"strftime", {"<time.h>", "<ctime>"} },
+    {"time", {"<time.h>", "<ctime>"} },
+    {"time_t", {"<time.h>", "<ctime>"} },
+    {"tm", {"<time.h>", "<ctime>"} },
+
     /* <wchar.h>.  */
     {"WCHAR_MAX", {"<wchar.h>", "<cwchar>"} },
     {"WCHAR_MIN", {"<wchar.h>", "<cwchar>"} }
diff --git a/gcc/testsuite/g++.dg/spellcheck-stdlib.C b/gcc/testsuite/g++.dg/spellcheck-stdlib.C
index 87736b25e54b..7a70641e3ae1 100644
--- a/gcc/testsuite/g++.dg/spellcheck-stdlib.C
+++ b/gcc/testsuite/g++.dg/spellcheck-stdlib.C
@@ -158,6 +158,35 @@ void test_cstdlib (void *q)
   // { dg-message "'#include <cstdlib>'" "" { target *-*-* } .-1 }
 }
 
+/* Missing <ctime>.  */
+
+void test_ctime (void *q, long s, double d)
+{
+  clock_t c; // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  time_t t; // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  tm t2; // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  d = difftime (0, 0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  s = mktime (q); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  s = time (0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  q = asctime (0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  q = ctime (0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  q = gmtime (0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  q = localtime (0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+  char c[2];
+  strftime (c, 2, "", 0); // { dg-error "was not declared" }
+  // { dg-message "'#include <ctime>'" "" { target *-*-* } .-1 }
+}
+
 /* Verify that we don't offer suggestions to stdlib globals names when
    there's an explicit namespace.  */
 
-- 
2.47.2