Autotool new options : --with/--without -getrandom and --with/--without -sysgetrandom.
Autodetect works by default for getrandom and sysgetrandom.
With the these options user can use the detected functions or ignore them.
@@ -183,8 +183,16 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])])])
+AC_ARG_WITH([getrandom],
+ [AS_HELP_STRING([--with-getrandom],
+ [enforce the use of getrandom function in the system @<:@default=check@:>@])
+AS_HELP_STRING([--without-getrandom],
+ [skip auto detect of getrandom @<:@default=check@:>@])],
+ [],
+ [with_getrandom=check])
-AC_MSG_CHECKING([for getrandom (Linux 3.17+, glibc 2.25+)])
+AS_IF([test "x$with_getrandom" != xno],
+ [AC_MSG_CHECKING([for getrandom (Linux 3.17+, glibc 2.25+)])
AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <stdlib.h> /* for NULL */
#include <sys/random.h>
@@ -195,8 +203,19 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([
[AC_DEFINE([HAVE_GETRANDOM], [1], [Define to 1 if you have the `getrandom' function.])
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])
+ AS_IF([test "x$with_getrandom" = xyes],
+ [AC_MSG_ERROR([enforced the use of getrandom --with-getrandom, but not detected])])])])
+
+AC_ARG_WITH([sys_getrandom],
+ [AS_HELP_STRING([--with-sys-getrandom],
+ [enforce the use of syscall SYS_getrandom function in the system @<:@default=check@:>@])
+AS_HELP_STRING([--without-sys-getrandom],
+ [skip auto detect of syscall SYS_getrandom @<:@default=check@:>@])],
+ [],
+ [with_sys_getrandom=check])
- AC_MSG_CHECKING([for syscall SYS_getrandom (Linux 3.17+)])
+AS_IF([test "x$with_sys_getrandom" != xno],
+ [AC_MSG_CHECKING([for syscall SYS_getrandom (Linux 3.17+)])
AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <stdlib.h> /* for NULL */
#include <unistd.h> /* for syscall */
@@ -208,8 +227,9 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([
])],
[AC_DEFINE([HAVE_SYSCALL_GETRANDOM], [1], [Define to 1 if you have `syscall' and `SYS_getrandom'.])
AC_MSG_RESULT([yes])],
- [AC_MSG_RESULT([no])])])
-
+ [AC_MSG_RESULT([no])
+ AS_IF([test "x$with_sys_getrandom" = xyes],
+ [AC_MSG_ERROR([enforced the use of syscall SYS_getrandom --with-sys-getrandom, but not detected])])])])
dnl Only needed for xmlwf:
AC_CHECK_HEADERS(fcntl.h unistd.h)
