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# Copyright © 2005 Scott James Remnant <scott@netsplit.com>
# Copyright © 2008-2009,2015 Guillem Jover <guillem@debian.org>
# DPKG_FUNC_VA_COPY
# -----------------
# Define HAVE_VA_COPY if we have va_copy.
AC_DEFUN([DPKG_FUNC_VA_COPY], [
AC_CACHE_CHECK([for va_copy], [dpkg_cv_va_copy], [
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#include <stdarg.h>
]], [[
va_list v1, v2;
va_copy(v1, v2);
]])
], [
dpkg_cv_va_copy=yes
], [
dpkg_cv_va_copy=no
])
])
AS_IF([test "x$dpkg_cv_va_copy" = "xyes"], [
AC_DEFINE([HAVE_VA_COPY], [1], [Define to 1 if the 'va_copy' macro exists])
])
])# DPKG_FUNC_VA_COPY
# DPKG_FUNC_C99_SNPRINTF
# -----------------------
# Define HAVE_C99_SNPRINTF if we have C99 snprintf family semantics
AC_DEFUN([DPKG_FUNC_C99_SNPRINTF], [
AC_CACHE_CHECK([for C99 snprintf functions], [dpkg_cv_c99_snprintf], [
AC_RUN_IFELSE([
AC_LANG_SOURCE([[
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
int test_vsnprintf(const char *fmt, ...)
{
int n;
va_list args;
va_start(args, fmt);
n = vsnprintf(NULL, 0, fmt, args);
va_end(args);
return n;
}
int main()
{
int n;
n = snprintf(NULL, 0, "format %s %d", "string", 10);
if (n != strlen("format string 10"))
return 1;
n = test_vsnprintf("format %s %d", "string", 10);
if (n != strlen("format string 10"))
return 1;
return 0;
}
]])
], [
dpkg_cv_c99_snprintf=yes
], [
dpkg_cv_c99_snprintf=no
], [
dpkg_cv_c99_snprintf=maybe
])
AS_IF([test "x$dpkg_cv_c99_snprintf" = "xmaybe"], [
AC_COMPILE_IFELSE([
AC_LANG_SOURCE([[
#define _GNU_SOURCE 1
#include <unistd.h>
#if !defined(_XOPEN_VERSION) || _XOPEN_VERSION < 600
#error "snprintf() has conflicting semantics with C99 on SUSv2 and earlier"
#endif
]])
], [
dpkg_cv_c99_snprintf=yes
], [
dpkg_cv_c99_snprintf=no
])
])
])
AS_IF([test "x$dpkg_cv_c99_snprintf" = "xyes"], [
AC_DEFINE([HAVE_C99_SNPRINTF], [1],
[Define to 1 if the 'snprintf' family is C99 conformant])
])
AM_CONDITIONAL([HAVE_C99_SNPRINTF], [test "x$dpkg_cv_c99_snprintf" = "xyes"])
])# DPKG_FUNC_C99_SNPRINTF
# DPKG_USE_MMAP
# -------------
# Define USE_MMAP if mmap() is available and it was requested
AC_DEFUN([DPKG_USE_MMAP], [
AC_ARG_ENABLE([mmap],
[AS_HELP_STRING([--enable-mmap],
[enable usage of unrealiable mmap if available])],
[], [enable_mmap=no])
AS_IF([test "x$enable_mmap" = "xyes"], [
AC_CHECK_FUNCS([mmap])
AC_DEFINE([USE_MMAP], [1], [Use unreliable mmap support])
])
])
# DPKG_USE_DISK_PREALLOCATE
# -------------------------
# Define USE_DISK_PREALLOCATE if disk size pre-allocation is available
# and it was requested.
AC_DEFUN([DPKG_USE_DISK_PREALLOCATE], [
AC_ARG_ENABLE([disk-preallocate],
[AS_HELP_STRING([--enable-disk-preallocate],
[enable usage of disk size pre-allocation])],
[], [enable_disk_preallocate=no])
AS_IF([test "x$enable_disk_preallocate" = "xyes"], [
AC_DEFINE([USE_DISK_PREALLOCATE], [1], [Use disk size pre-allocation])
])
])
# DPKG_CHECK_PROGNAME
# -------------------
# Check for system implementations of program name tracking.
AC_DEFUN([DPKG_CHECK_PROGNAME], [
AC_MSG_CHECKING([for program_invocation_short_name])
AC_LINK_IFELSE([
AC_LANG_PROGRAM(
[[#include <errno.h>]],
[[const char *p = program_invocation_short_name;]])
], [
AC_DEFINE([HAVE_PROGRAM_INVOCATION_SHORT_NAME], [1],
[Define to 1 if you have program_invocation_short_name])
AC_MSG_RESULT([yes])
], [
AC_MSG_RESULT([no])
])
AC_MSG_CHECKING([for __progname])
AC_LINK_IFELSE([
AC_LANG_PROGRAM(
[[extern char *__progname;]],
[[printf("%s", __progname);]])
], [
AC_DEFINE([HAVE___PROGNAME], [1], [Define to 1 if you have __progname])
AC_MSG_RESULT([yes])
], [
AC_MSG_RESULT([no])
])
]) # DPKG_CHECK_PROGNAME
# DPKG_CHECK_COMPAT_FUNCS(LIST)
# -----------------------
# Check each function and define an automake conditional
AC_DEFUN([DPKG_CHECK_COMPAT_FUNCS], [
AC_CHECK_FUNCS([$1])
m4_foreach_w([ac_func], [$1], [
AM_CONDITIONAL([HAVE_]AS_TR_CPP(ac_func),
[test "x$ac_cv_func_[]AS_TR_SH(ac_func)" = "xyes"])
])
]) # DPKG_CHECK_COMPAT_FUNCS
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