nut-debian/m4/nut_check_libssl.m4
2010-03-26 00:20:59 +01:00

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dnl Check for LIBSSL compiler flags. On success, set nut_have_libssl="yes"
dnl and set LIBSSL_CFLAGS and LIBSSL_LDFLAGS. On failure, set
dnl nut_have_libssl="no". This macro can be run multiple times, but will
dnl do the checking only once.
AC_DEFUN([NUT_CHECK_LIBSSL],
[
if test -z "${nut_have_libssl_seen}"; then
nut_have_libssl_seen=yes
dnl save CFLAGS and LDFLAGS
CFLAGS_ORIG="${CFLAGS}"
LDFLAGS_ORIG="${LDFLAGS}"
AC_MSG_CHECKING(for openssl version via pkg-config)
OPENSSL_VERSION=`pkg-config --silence-errors --modversion openssl`
if test "$?" = "0"; then
AC_MSG_RESULT(${OPENSSL_VERSION} found)
CFLAGS="`pkg-config --silence-errors --cflags openssl`"
LDFLAGS="`pkg-config --silence-errors --libs openssl`"
else
AC_MSG_RESULT(not found)
CFLAGS=""
LDFLAGS="-lssl -lcrypto"
fi
dnl allow overriding openssl settings if the user knows best
AC_MSG_CHECKING(for openssl cflags)
AC_ARG_WITH(ssl-includes, [
AC_HELP_STRING([--with-ssl-includes=CFLAGS], [include flags for the OpenSSL library])
], [CFLAGS="${withval}"], [])
AC_MSG_RESULT([${CFLAGS}])
AC_MSG_CHECKING(for openssl ldflags)
AC_ARG_WITH(ssl-libs, [
AC_HELP_STRING([--with-ssl-libs=LDFLAGS], [linker flags for the OpenSSL library])
], [LDFLAGS="${withval}"], [])
AC_MSG_RESULT([${LDFLAGS}])
dnl check if openssl is usable
AC_CHECK_HEADERS(openssl/ssl.h, [nut_have_libssl=yes], [nut_have_libssl=no], [AC_INCLUDES_DEFAULT])
AC_CHECK_FUNCS(SSL_library_init, [], [nut_have_libssl=no])
if test "${nut_have_libssl}" = "yes"; then
AC_DEFINE(HAVE_SSL, 1, [Define to enable SSL development code])
LIBSSL_CFLAGS="${CFLAGS}"
LIBSSL_LDFLAGS="${LDFLAGS}"
fi
dnl restore original CFLAGS and LDFLAGS
CFLAGS="${CFLAGS_ORIG}"
LDFLAGS="${LDFLAGS_ORIG}"
fi
])