configure.ac

## LibRdRand:
## an example of using Automake and Libtool to build a shared librar

AC_INIT([LibRdRand],[1.2.0],[jan@tulak.me],[librdrand],[https://github.com/BroukPytlik/RdRand])
AM_INIT_AUTOMAKE([foreign -Wall -Werror])

# Add these lines for library support
AM_PROG_AR
LT_INIT

AC_PROG_CC
PKG_PROG_PKG_CONFIG


# Generate two configuration headers; one for building the library itself with
# an autogenerated template, and a second one that will be installed alongside
# the library.
AC_CONFIG_HEADERS([config.h rdrandconfig.h])
AC_PROG_CXX
AC_CONFIG_MACRO_DIRS([m4])

###################
# Check for OpenMP
AC_OPENMP

AC_SUBST(OPENMP_CFLAGS)
##################


##################
# Check for OpenSSL
AC_ARG_WITH([openssl],
    [AS_HELP_STRING([--with-openssl=DIR],
        [root of OpenSSL directory])],
    [
        # Check if specified directory exists
        if test ! -d "$withval"; then
            AC_MSG_ERROR([$withval: no such directory])
        fi
        OPENSSL_INCLUDES="-I$withval/include"
        OPENSSL_LDFLAGS="-L$withval/lib"
        OPENSSL_LIBS="-lssl -lcrypto"
    ],
    [
        # No explicit path specified, search in standard locations
        PKG_CHECK_MODULES([OPENSSL], [openssl >= 1.0.1],
            [OPENSSL_INCLUDES="$OPENSSL_CFLAGS"],
            [
                # Fallback to manual check if pkg-config fails
                AC_CHECK_HEADERS([openssl/ssl.h openssl/err.h], [],
                    [AC_MSG_ERROR([OpenSSL headers not found. Install OpenSSL development package.])])

                AC_CHECK_LIB([crypto], [EVP_EncryptInit],
                    [OPENSSL_LIBS="-lcrypto"],
                    [AC_MSG_ERROR([libcrypto not found. Install OpenSSL.])])

                AC_CHECK_LIB([ssl], [SSL_new],
                    [OPENSSL_LIBS="$OPENSSL_LIBS -lssl"],
                    [AC_MSG_ERROR([libssl not found. Install OpenSSL.])],
                    [$OPENSSL_LIBS])
            ])
    ])

# Set final flags
AC_SUBST([OPENSSL_INCLUDES])
AC_SUBST([OPENSSL_LDFLAGS])
AC_SUBST([OPENSSL_LIBS])
##################

###########
# -mrdrnd
AC_MSG_CHECKING([whether CC supports -mrdrnd])
my_save_cflags="$CFLAGS"
CFLAGS="$CFLAGS -mrdrnd"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[]])],
    [AC_MSG_RESULT([yes])]
    [cc_supports_rdrnd=yes],
    [AC_MSG_RESULT([no])]
    [cc_supports_rdrnd=no])
CFLAGS="$my_save_cflags"
unset my_save_cflags

if test -z "$RDRND_FLAGS"
then
    RDRND_TESTS='rdrnd${EXEEXT}'
    if test "$cc_supports_rdrnd" = "yes"
    then
        RDRND_FLAGS="-mrdrnd"
    else
        RDRND_FLAGS=""
    fi
else
    RDRND_TESTS=""
fi
AC_SUBST([RDRND_FLAGS])

###########

LT_INIT([disable-static])

# Define these substitions here to keep all version information in one place.
# For information on how to properly maintain the library version information,
# refer to the libtool manual, section "Updating library version information":
# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
AC_SUBST([RDRAND_SO_VERSION], [1:2:0])
AC_SUBST([RDRAND_API_VERSION], [1.2.0])

# Override the template file name of the generated .pc file, so that there
# is no need to rename the template file when the API version changes.
#rdrand-${RDRAND_API_VERSION}.pc:rdrand.pc.in])
AC_CONFIG_FILES([Makefile
      librdrand.pc:librdrand.pc.in])
AC_OUTPUT