configure: Expose optional features via AC_ARG_WITH()
This allows us to exercise different potential target environments by
turning features on and off via the build system. With some CI magic we
can help ensure that the code doesn't bitrot for these environments.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I75a8e28f32149e9f78dbe68510b5516f89dc9137
diff --git a/configure.ac b/configure.ac
index 42b33f2..138fa05 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,6 +16,7 @@
LT_INIT
AC_CHECK_HEADERS_ONCE([endian.h])
+AC_CHECK_HEADERS_ONCE([unistd.h fcntl.h])
# pkg-config
PKG_PROG_PKG_CONFIG
@@ -40,13 +41,87 @@
)
AM_CONDITIONAL([HAVE_SYSTEMD], [test "x$with_systemdsystemunitdir" != "xno"])
-# Set defaults for standard library compiles. We may want to
-# AC_ARG_WITH these in the future.
-AC_DEFINE([MCTP_HAVE_SYSLOG], [1], [Define to enable syslog])
-AC_DEFINE([MCTP_HAVE_FILEIO], [1], [Define to enable filesystem functions])
-AC_DEFINE([MCTP_HAVE_STDIO], [1], [Define to enable stdio functions])
-AC_DEFINE([MCTP_DEFAULT_ALLOC], [1],
- [Define to populate allocation functions to defaults (malloc/free)])
+AC_ARG_WITH([syslog],
+ [AS_HELP_STRING([--with-syslog], [Support logging to syslog])],
+ [],
+ [with_syslog=check])
+
+AS_IF([test "x$with_syslog" != "xno"],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+#include <stdarg.h>
+#include <syslog.h>
+
+void check_vsyslog(int level, const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vsyslog(0, fmt, ap);
+ va_end(ap);
+}
+ ]],[[
+ check_vsyslog(0, "\n");
+ ]])],
+ [AC_DEFINE([MCTP_HAVE_SYSLOG], [1], [Define to enable syslog])],
+ [])],
+ [])
+
+AC_ARG_WITH([fileio],
+ [AS_HELP_STRING([--with-fileio],
+ [Support interfaces based on file-descriptors])],
+ [],
+ [with_fileio=check])
+
+AS_IF([test "x$with_fileio" = "xcheck"],
+ [AC_DEFINE([MCTP_HAVE_FILEIO], [(HAVE_UNISTD_H && HAVE_FCNTL_H)],
+ [Support interfaces based on file-descriptors])],
+ [AS_IF([test "x$with_fileio" = "xyes"],
+ [AC_DEFINE([MCTP_HAVE_FILEIO], [1],
+ [Support interfaces based on file-descriptors])],
+ [])])
+
+AC_ARG_WITH([stdio],
+ [AS_HELP_STRING([--with-stdio], [Support logging to stdio])],
+ [],
+ [with_stdio=check])
+
+AS_IF([test "x$with_stdio" != "xno"],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+#include <stdarg.h>
+#include <stdio.h>
+void check_vprintf(const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vprintf(fmt, ap);
+ va_end(ap);
+}
+ ]],[[
+ check_vprintf("\n");
+ ]])],
+ [AC_DEFINE([MCTP_HAVE_STDIO], [1], [Define to enable stdio functions])],
+ [])],
+ [])
+
+AC_ARG_WITH([default-alloc],
+ [AS_HELP_STRING([--with-default-alloc],
+ [Use libc malloc and free for heap memory])],
+ [],
+ [with_default_alloc=check])
+
+AS_IF([test "x$with_default_alloc" != "xno"],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[
+#include <stdlib.h>
+ ]], [[
+free(malloc(4096));
+ ]])],
+ [AC_DEFINE([MCTP_DEFAULT_ALLOC],
+ [1],
+ [Define to use libc malloc and free for heap memory])],
+ [])],
+ [])
# Enable all bindings. AC_ARG_ENABLE in future.
AM_CONDITIONAL([LIBMCTP_BINDING_serial], [true])