#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.69])
AC_INIT([libbrandt], [0.1], [teichm@net.in.tum.de])

AM_INIT_AUTOMAKE([1.14])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_SRCDIR([brandt.c])
AC_CONFIG_HEADERS([brandt_config.h])

# Checks for header files.
AC_CHECK_HEADERS([stdint.h stdlib.h string.h unistd.h])

# Checks for programs.
AC_PROG_CC_C99
LT_INIT([pic-only])

# fix std
CC=$(echo "${CC}" | sed 's/-std=gnu99/-std=c99/')
CPP=$(echo "${CPP}" | sed 's/-std=gnu99/-std=c99/')

# Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_TYPE_INTMAX_T
AC_TYPE_UINTMAX_T

# Checks for libraries.
AC_SEARCH_LIBS([gcry_check_version], [gcrypt], [], [AC_MSG_ERROR([unable to find the gcry_check_version() function from libgcrypt])])

# Checks for header files.
AC_CHECK_HEADER(gcrypt.h, [], [AC_MSG_ERROR([unable to find the gcrypt.h header file from libgcrypt])], [])

SAVE_LIBS=$LIBS

# libgcrypt
gcrypt=0
NEED_LIBGCRYPT_API=1
NEED_LIBGCRYPT_VERSION=1.7.0


AM_PATH_LIBGCRYPT("$NEED_LIBGCRYPT_API:$NEED_LIBGCRYPT_VERSION", gcrypt=1)
AC_CHECK_DECLS([gcry_mpi_ec_sub], [], [], [[#include <gcrypt.h>]])

if test $gcrypt = 0
then
  AC_MSG_ERROR([[
***
*** You need libgcrypt to build this program.
**  This library is for example available at
***   ftp://ftp.gnupg.org/gcrypt/libgcrypt/
*** (at least version $NEED_LIBGCRYPT_VERSION (API $NEED_LIBGCRYPT_API)
***  is required.)
***]])
fi
AC_DEFINE_UNQUOTED([NEED_LIBGCRYPT_VERSION], "$NEED_LIBGCRYPT_VERSION", [required libgcrypt version])

# libgnunetutil
libgnunetutil=0
AC_MSG_CHECKING([for libgnunetutil])
AC_ARG_WITH(gnunet,
            [AS_HELP_STRING([--with-gnunet=PFX], [base of GNUnet installation])],
            [AC_MSG_RESULT([given as $with_gnunet])],
            [AC_MSG_RESULT(not given)
             with_gnunet=yes])
AS_CASE([$with_gnunet],
        [yes], [],
        [no], [AC_MSG_ERROR([--with-gnunet is required])],
        [LDFLAGS="-L$with_gnunet/lib $LDFLAGS"
         CPPFLAGS="-I$with_gnunet/include $CPPFLAGS"])
AC_CHECK_HEADERS([gnunet/platform.h gnunet/gnunet_util_lib.h],
 [AC_CHECK_LIB([gnunetutil], [GNUNET_SCHEDULER_run], libgnunetutil=1)],
  [], [#ifdef HAVE_GNUNET_PLATFORM_H
        #include <gnunet/platform.h>
       #endif])
AS_IF([test $libgnunetutil != 1],
  [AC_MSG_ERROR([[
***
*** You need libgnunetutil to build this program.
*** This library is part of GNUnet, available at
***   https://gnunet.org
*** ]])])

# restore LIBS
LIBS=$SAVE_LIBS

# Adam shostack suggests the following for Windows:
# -D_FORTIFY_SOURCE=2 -fstack-protector-all
AC_ARG_ENABLE(gcc-hardening,
   AS_HELP_STRING(--enable-gcc-hardening, enable compiler security checks),
[if test x$enableval = xyes; then
    CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all"
    CFLAGS="$CFLAGS -fwrapv -fPIE -Wstack-protector"
    CFLAGS="$CFLAGS --param ssp-buffer-size=1"
    LDFLAGS="$LDFLAGS -pie"
fi])


# Linker hardening options
# Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
  AS_HELP_STRING(--enable-linker-hardening, enable linker security fixups),
[if test x$enableval = xyes; then
   LDFLAGS="$LDFLAGS -z relro -z now"
fi])

AC_CONFIG_FILES([
Makefile
doc/Makefile
])
AC_OUTPUT