Arrange to supply declarations for strtoll/strtoull if needed.

tglsfdc · tglsfdc · commit c964c2147136 · 2018-05-18T22:42:10.000-04:00
Buildfarm member dromedary is still unhappy about the recently-added ecpg "long long" tests. The reason turns out to be that it includes "-ansi" in its CFLAGS, and in their infinite wisdom Apple have decided to hide the declarations of strtoll/strtoull in C89-compliant builds. (I find it pretty curious that they hide those function declarations when you can nonetheless declare a "long long" variable, but anyway that is their behavior, both on dromedary's obsolete macOS version and the newest and shiniest.) As a result, gcc assumes these functions return "int", leading naturally to wrong results. (Looking at dromedary's past build results, it's evident that this problem also breaks pg_strtouint64() on 32-bit platforms; but we evidently have no regression tests that exercise that function with values above 32 bits.) To fix, supply declarations for these functions when the platform provides the functions but not the declarations, using the same type of mechanism as we use for some other similar cases. Discussion: https://postgr.es/m/151935568942.1461.14623890240535309745@wrigleys.postgresql.org
diff --git a/configure b/configure
@@ -13915,6 +13915,28 @@ _ACEOF
 fi
 done
 
+# strto[u]ll may exist but not be declared
+ac_fn_c_check_decl "$LINENO" "strtoll" "ac_cv_have_decl_strtoll" "$ac_includes_default"
+if test "x$ac_cv_have_decl_strtoll" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_STRTOLL $ac_have_decl
+_ACEOF
+ac_fn_c_check_decl "$LINENO" "strtoull" "ac_cv_have_decl_strtoull" "$ac_includes_default"
+if test "x$ac_cv_have_decl_strtoull" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_STRTOULL $ac_have_decl
+_ACEOF
+
 
 if test "$with_icu" = yes; then
   ac_save_CPPFLAGS=$CPPFLAGS
diff --git a/configure.in b/configure.in
@@ -1659,6 +1659,8 @@ fi
 
 AC_CHECK_FUNCS([strtoll strtoq], [break])
 AC_CHECK_FUNCS([strtoull strtouq], [break])
+# strto[u]ll may exist but not be declared
+AC_CHECK_DECLS([strtoll, strtoull])
 
 if test "$with_icu" = yes; then
   ac_save_CPPFLAGS=$CPPFLAGS
diff --git a/src/include/c.h b/src/include/c.h
@@ -1076,6 +1076,14 @@ extern int	snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_p
 extern int	vsnprintf(char *str, size_t count, const char *fmt, va_list args);
 #endif
 
+#if defined(HAVE_LONG_LONG_INT) && defined(HAVE_STRTOLL) && !HAVE_DECL_STRTOLL
+extern long long strtoll(const char *str, char **endptr, int base);
+#endif
+
+#if defined(HAVE_LONG_LONG_INT) && defined(HAVE_STRTOULL) && !HAVE_DECL_STRTOULL
+extern unsigned long long strtoull(const char *str, char **endptr, int base);
+#endif
+
 #if !defined(HAVE_MEMMOVE) && !defined(memmove)
 #define memmove(d, s, c)		bcopy(s, d, c)
 #endif
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
@@ -150,6 +150,14 @@
    don't. */
 #undef HAVE_DECL_STRLCPY
 
+/* Define to 1 if you have the declaration of `strtoll', and to 0 if you
+   don't. */
+#undef HAVE_DECL_STRTOLL
+
+/* Define to 1 if you have the declaration of `strtoull', and to 0 if you
+   don't. */
+#undef HAVE_DECL_STRTOULL
+
 /* Define to 1 if you have the declaration of `sys_siglist', and to 0 if you
    don't. */
 #undef HAVE_DECL_SYS_SIGLIST
diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32
@@ -102,6 +102,14 @@
    don't. */
 #define HAVE_DECL_SNPRINTF 1
 
+/* Define to 1 if you have the declaration of `strtoll', and to 0 if you
+   don't. */
+#define HAVE_DECL_STRTOLL 1
+
+/* Define to 1 if you have the declaration of `strtoull', and to 0 if you
+   don't. */
+#define HAVE_DECL_STRTOULL 1
+
 /* Define to 1 if you have the declaration of `vsnprintf', and to 0 if you
    don't. */
 #define HAVE_DECL_VSNPRINTF 1
