1 files changed, 142 insertions, 0 deletions
diff --git a/config/c-library.m4 b/config/c-library.m4
new file mode 100644
index 0000000..c1dd804
--- /dev/null
+++ b/config/c-library.m4
@@ -0,0 +1,142 @@
+# Macros that test various C library quirks
+# config/c-library.m4
+
+
+# PGAC_VAR_INT_TIMEZONE
+# ---------------------
+# Check if the global variable `timezone' exists. If so, define
+# HAVE_INT_TIMEZONE.
+AC_DEFUN([PGAC_VAR_INT_TIMEZONE],
+[AC_CACHE_CHECK(for int timezone, pgac_cv_var_int_timezone,
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <time.h>
+int res;],
+  [#ifndef __CYGWIN__
+res = timezone / 60;
+#else
+res = _timezone / 60;
+#endif])],
+  [pgac_cv_var_int_timezone=yes],
+  [pgac_cv_var_int_timezone=no])])
+if test x"$pgac_cv_var_int_timezone" = xyes ; then
+  AC_DEFINE(HAVE_INT_TIMEZONE, 1,
+            [Define to 1 if you have the global variable 'int timezone'.])
+fi])# PGAC_VAR_INT_TIMEZONE
+
+
+# PGAC_STRUCT_TIMEZONE
+# ------------------
+# Figure out how to get the current timezone.  If `struct tm' has a
+# `tm_zone' member, define `HAVE_STRUCT_TM_TM_ZONE'.  Unlike the
+# standard macro AC_STRUCT_TIMEZONE, we don't check for `tzname[]' if
+# not found, since we don't use it.  (We use `int timezone' as a
+# fallback.)
+AC_DEFUN([PGAC_STRUCT_TIMEZONE],
+[AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
+#include <time.h>
+])
+])# PGAC_STRUCT_TIMEZONE
+
+
+# PGAC_FUNC_STRERROR_R_INT
+# ---------------------------
+# Check if strerror_r() returns int (POSIX) rather than char * (GNU libc).
+# If so, define STRERROR_R_INT.
+# The result is uncertain if strerror_r() isn't provided,
+# but we don't much care.
+AC_DEFUN([PGAC_FUNC_STRERROR_R_INT],
+[AC_CACHE_CHECK(whether strerror_r returns int,
+pgac_cv_func_strerror_r_int,
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <string.h>],
+[[char buf[100];
+  switch (strerror_r(1, buf, sizeof(buf)))
+  { case 0: break; default: break; }
+]])],
+[pgac_cv_func_strerror_r_int=yes],
+[pgac_cv_func_strerror_r_int=no])])
+if test x"$pgac_cv_func_strerror_r_int" = xyes ; then
+  AC_DEFINE(STRERROR_R_INT, 1,
+            [Define to 1 if strerror_r() returns int.])
+fi
+])# PGAC_FUNC_STRERROR_R_INT
+
+
+# PGAC_UNION_SEMUN
+# ----------------
+# Check if `union semun' exists. Define HAVE_UNION_SEMUN if so.
+# If it doesn't then one could define it as
+# union semun { int val; struct semid_ds *buf; unsigned short *array; }
+AC_DEFUN([PGAC_UNION_SEMUN],
+[AC_CHECK_TYPES([union semun], [], [],
+[#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+])])# PGAC_UNION_SEMUN
+
+
+# PGAC_STRUCT_SOCKADDR_MEMBERS
+# ----------------------------
+# Check if struct sockaddr and subtypes have 4.4BSD-style length.
+AC_DEFUN([PGAC_STRUCT_SOCKADDR_SA_LEN],
+[AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [],
+[#include <sys/types.h>
+#include <sys/socket.h>
+])])# PGAC_STRUCT_SOCKADDR_MEMBERS
+
+
+# PGAC_TYPE_LOCALE_T
+# ------------------
+# Check for the locale_t type and find the right header file.  macOS
+# needs xlocale.h; standard is locale.h, but glibc also has an
+# xlocale.h file that we should not use.
+#
+AC_DEFUN([PGAC_TYPE_LOCALE_T],
+[AC_CACHE_CHECK([for locale_t], pgac_cv_type_locale_t,
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <locale.h>
+locale_t x;],
+[])],
+[pgac_cv_type_locale_t=yes],
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <xlocale.h>
+locale_t x;],
+[])],
+[pgac_cv_type_locale_t='yes (in xlocale.h)'],
+[pgac_cv_type_locale_t=no])])])
+if test "$pgac_cv_type_locale_t" != no; then
+  AC_DEFINE(HAVE_LOCALE_T, 1,
+            [Define to 1 if the system has the type `locale_t'.])
+fi
+if test "$pgac_cv_type_locale_t" = 'yes (in xlocale.h)'; then
+  AC_DEFINE(LOCALE_T_IN_XLOCALE, 1,
+            [Define to 1 if `locale_t' requires <xlocale.h>.])
+fi])# PGAC_TYPE_LOCALE_T
+
+
+# PGAC_FUNC_WCSTOMBS_L
+# --------------------
+# Try to find a declaration for wcstombs_l().  It might be in stdlib.h
+# (following the POSIX requirement for wcstombs()), or in locale.h, or in
+# xlocale.h.  If it's in the latter, define WCSTOMBS_L_IN_XLOCALE.
+#
+AC_DEFUN([PGAC_FUNC_WCSTOMBS_L],
+[AC_CACHE_CHECK([for wcstombs_l declaration], pgac_cv_func_wcstombs_l,
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <stdlib.h>
+#include <locale.h>],
+[#ifndef wcstombs_l
+(void) wcstombs_l;
+#endif])],
+[pgac_cv_func_wcstombs_l='yes'],
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <stdlib.h>
+#include <locale.h>
+#include <xlocale.h>],
+[#ifndef wcstombs_l
+(void) wcstombs_l;
+#endif])],
+[pgac_cv_func_wcstombs_l='yes (in xlocale.h)'],
+[pgac_cv_func_wcstombs_l='no'])])])
+if test "$pgac_cv_func_wcstombs_l" = 'yes (in xlocale.h)'; then
+  AC_DEFINE(WCSTOMBS_L_IN_XLOCALE, 1,
+            [Define to 1 if `wcstombs_l' requires <xlocale.h>.])
+fi])# PGAC_FUNC_WCSTOMBS_L