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

#
# Copyright 2016-2018 The nlfaultinjection Authors.

#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#

#
#    Description:
#      This file is the GNU autoconf input source file for Nest
#      Labs Fault Injection.
#

#
# Declare autoconf version requirements
#
AC_PREREQ([2.68])

#
# Initialize autoconf for the package
#
AC_INIT([nlfaultinjection],
        m4_esyscmd([third_party/nlbuild-autotools/repo/scripts/mkversion -b `cat .default-version` .]),
        [nlfaultinjection-users@google.com],
        [nlfaultinjection],
        [https://github.com/nestlabs/nlfaultinjection/])

# Tell the rest of the build system the absolute path where the
# nlbuild-autotools repository is rooted at.

AC_SUBST(nlbuild_autotools_stem,[third_party/nlbuild-autotools/repo])
AC_SUBST(abs_top_nlbuild_autotools_dir,[\${abs_top_srcdir}/\${nlbuild_autotools_stem}])

#
# nlfaultinjection interface current, revision, and age versions.
#
# NOTE: At present, NLFAULTINJECTION makes NO ABI compatibility
#       commitments. Consequently, these simply serve as documentation
#       for how the interfaces have evolved.
#
# Maintainters: Please manage these fields as follows:
#
#   Interfaces removed:    CURRENT++, AGE = 0, REVISION = 0
#   Interfaces added:      CURRENT++, AGE++,   REVISION = 0
#   No interfaces changed:                     REVISION++
#
#
AC_SUBST(LIBNLFAULTINJECTION_VERSION_CURRENT,  [2])
AC_SUBST(LIBNLFAULTINJECTION_VERSION_AGE,      [1])
AC_SUBST(LIBNLFAULTINJECTION_VERSION_REVISION, [0])
AC_SUBST(LIBNLFAULTINJECTION_VERSION_INFO,     [${LIBNLFAULTINJECTION_VERSION_CURRENT}:${LIBNLFAULTINJECTION_VERSION_REVISION}:${LIBNLFAULTINJECTION_VERSION_AGE}])

#
# Check the sanity of the source directory by checking for the
# presence of a key watch file
#
AC_CONFIG_SRCDIR([include/nlfaultinjection.hpp])

#
# Tell autoconf where to find auxilliary build tools (e.g. config.guess,
# install-sh, missing, etc.)
#
AC_CONFIG_AUX_DIR([third_party/nlbuild-autotools/repo/third_party/autoconf])

#
# Tell autoconf where to find auxilliary M4 macros
#
AC_CONFIG_MACRO_DIRS([third_party/nlbuild-autotools/repo/third_party/autoconf/m4 third_party/nlbuild-autotools/repo/autoconf/m4])

#
# Tell autoconf what file the package is using to aggregate C preprocessor
# defines.
#
AC_CONFIG_HEADERS([include/nlfaultinjection-config.h])

#
# Figure out what the canonical build, host and target tuples are.
#
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

#
# Mac OS X / Darwin ends up putting some versioning cruft on the end of its
# tuple that we don't care about in this script. Create "clean" variables
# devoid of it.
#

NL_FILTERED_CANONICAL_BUILD
NL_FILTERED_CANONICAL_HOST
NL_FILTERED_CANONICAL_TARGET

#
# Configure automake with the desired options, indicating that this is not
# a native GNU package, that we want "silent" build rules, and that we want
# objects built in the same subdirectory as their source rather than collapsed
# together at the top-level directory.
#
# Disable silent build rules by either passing --disable-silent-rules to
# configure or passing V=1 to make
#
AM_INIT_AUTOMAKE([1.14 foreign silent-rules subdir-objects tar-pax])

#
# Silent build rules requires at least automake-1.11. Employ
# techniques for not breaking earlier versions of automake.
#
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AM_SILENT_RULES([yes])

#
# Enable maintainer mode to prevent the package from constantly trying
# to rebuild configure, Makefile.in, etc. Rebuilding such files rarely,
# if ever, needs to be done "in the field".
#
# Use the included 'bootstrap' script instead when necessary.
#
AM_MAINTAINER_MODE

#
# Checks for build host programs
#

# If we are cross-compiling and we are on an embedded target that
# doesn't support independent, standalone executables, then all
# compiler tests that attempt to create an executable will fail. In
# such circumstances, set AC_NO_EXECUTABLES (see http://sourceware.org/
# ml/newlib/2006/msg00353.html).

AC_MSG_CHECKING([whether to disable executable checking])
if test "$cross_compiling" = yes; then
    AC_NO_EXECUTABLES
    AC_MSG_RESULT([yes])
else
    AC_MSG_RESULT([no])
fi

# Passing -Werror to GCC-based or -compatible compilers breaks some
# autoconf tests (see
# http://lists.gnu.org/archive/html/autoconf-patches/2008-09/msg00014.html).
#
# If -Werror has been passed transform it into -Wno-error. We'll
# transform it back later with NL_RESTORE_WERROR.

NL_SAVE_WERROR

# Check for compilers.
#
# These should be checked BEFORE we check for and, implicitly,
# initialize libtool such that libtool knows what languages it has to
# work with.

AC_PROG_CPP
AC_PROG_CPP_WERROR

AC_PROG_CC
AC_PROG_CC_C_O

AC_PROG_CXXCPP

AC_PROG_CXX
AC_PROG_CXX_C_O

# Check for other compiler toolchain tools.

AC_CHECK_TOOL(AR, ar)
AC_CHECK_TOOL(RANLIB, ranlib)
AC_CHECK_TOOL(OBJCOPY, objcopy)
AC_CHECK_TOOL(STRIP, strip)

# Check for other host tools.

AC_PROG_INSTALL
AC_PROG_LN_S

#
# Checks for specific compiler characteristics
#

#
# Common compiler flags we would like to have.
# Note that in gcc, -Wconversion implies -Wsign-conversion (but only for C)
#

PROSPECTIVE_CFLAGS="-Wall -Wextra -Wshadow -Werror -std=c99 -pedantic-errors -Wconversion -Wsign-conversion"
PROSPECTIVE_CXXFLAGS="-Wall -Wextra -Wshadow -Werror -Wconversion -Wsign-conversion"

TARGET_STYLE=
AC_MSG_CHECKING([for target style])

# The user may have attempted to explicitly specify the target
# style. Sanity check it or default to 'auto'.

AC_ARG_WITH(target-style,
    [AS_HELP_STRING([--with-target-style=TARGET],
        [Specify the target style from one of: auto, embedded or unix @<:@default=auto@:>@.])],
    [
        case "${with_target_style}" in

        auto|embedded|unix)
            ;;

        *)
            AC_MSG_ERROR([Invalid value ${with_target_style} for --with-target-style])
            ;;

        esac
    ],
    [with_target_style=auto])

# At this point, the target style is one of the allowed
# values. If it's 'auto' we autodetect it.

if test "${with_target_style}" = "auto"; then
    case ${target_os} in

    *cygwin*|*darwin*|*linux*|*freebsd*|*netbsd*|*openbsd*)
            with_target_style=unix
        ;;

    *freertos*)
            with_target_style=embedded
        ;;

    *)
        AC_MSG_RESULT([unknown])
        AC_MSG_ERROR([Unsupported target OS ${target_os}])
        ;;

    esac
fi

TARGET_STYLE=${with_target_style}

AC_MSG_RESULT(${TARGET_STYLE})

AC_SUBST(TARGET_STYLE)
AC_DEFINE_UNQUOTED([TARGET_STYLE],[${TARGET_STYLE}],[Target style])

if test "${TARGET_STYLE}" = "unix"; then
    PROSPECTIVE_CFLAGS="${PROSPECTIVE_CFLAGS} -fPIC -fno-stack-protector"
    PROSPECTIVE_CXXFLAGS="${PROSPECTIVE_CXXFLAGS} -fPIC -fno-exceptions"
fi


AC_CACHE_CHECK([whether $CC is Clang],
    [nl_cv_clang],
    [nl_cv_clang=no
    if test "x${GCC}" = "xyes"; then
        AC_EGREP_CPP([NL_CC_IS_CLANG],
            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
#            if defined(__clang__) && defined(__llvm__)
             NL_CC_IS_CLANG
#            endif
            ],
            [nl_cv_clang=yes])
    fi
    ])

AX_CHECK_COMPILER_OPTIONS([C],   ${PROSPECTIVE_CFLAGS})
AX_CHECK_COMPILER_OPTIONS([C++], ${PROSPECTIVE_CXXFLAGS})

# Check for and initialize libtool

LT_INIT

#
# Debug instances
#
AC_MSG_NOTICE([checking whether to build debug instances])

# Debug

NL_ENABLE_DEBUG([no])

AM_CONDITIONAL([NLFAULTINJECTION_BUILD_DEBUG], [test "${nl_cv_build_debug}" = "yes"])

#
# Code coverage and compiler optimization
#

# Coverage

NL_ENABLE_COVERAGE([no])

AM_CONDITIONAL([NLFAULTINJECTION_BUILD_COVERAGE], [test "${nl_cv_build_coverage}" = "yes"])

NL_ENABLE_COVERAGE_REPORTS([auto])

AM_CONDITIONAL([NLFAULTINJECTION_BUILD_COVERAGE_REPORTS], [test "${nl_cv_build_coverage_reports}" = "yes"])

# Optimization

NL_ENABLE_OPTIMIZATION([yes])

AM_CONDITIONAL([NLFAULTINJECTION_BUILD_OPTIMIZED], [test "${nl_cv_build_optimized}" = "yes"])

#
# Code style
#
AC_SUBST(PRETTY_CHECK, ["\${PERL} \${abs_top_srcdir}/third_party/cstyle/repo/cstyle.pl"])
AC_SUBST(PRETTY_CHECK_ARGS, ["\$(shell cat \${abs_top_srcdir}/build/cstyle/cstyle.options)"])

#
# Tests
#
AC_MSG_NOTICE([checking whether to build tests])

# Tests

NL_ENABLE_TESTS([yes])

AM_CONDITIONAL([NLFAULTINJECTION_BUILD_TESTS], [test "${nl_cv_build_tests}" = "yes"])

#
# Documentation
#

# Determine whether or not documentation (via Doxygen) should be built
# or not, with 'auto' as the default and establish a default support
# value for GraphViz 'dot' support.

NL_ENABLE_DOCS([auto],[NO])

AM_CONDITIONAL(NLFAULTINJECTION_BUILD_DOCS, [test "${nl_cv_build_docs}" = "yes"])

#
# Checks for libraries and packages.
#
# At minimum, the following packages are required:
#
#   * nlassert
#
# At minimum, the following packages are optional, depending on
# configuration:
#
#   * nlunit-test
#
# All of these are supplied "in package"; however, they may be also
# supplied out of package.
#
AC_MSG_NOTICE([checking required and optional package dependencies])

# Check if the build host has pkg-config

AC_PATH_PROG([PKG_CONFIG],[pkg-config])

#
# Nlassert
#

NL_WITH_PACKAGE(
    [Nlassert],
    [NLASSERT],
    [nlassert],
    [],
    [
        # At this point, the internal Nlassert package will be neither
        # configured nor built, so the normal checks we undertake for an
        # external package cannot be run here. Simply set the appropriate
        # variables and trust all will be well.

        NLASSERT_CPPFLAGS="-I\${abs_top_srcdir}/third_party/nlassert/repo/include"
        NLASSERT_LDFLAGS=
        NLASSERT_LIBS=
    ],
    [
        # Check for required Nlassert headers.

        AC_CHECK_HEADERS([nlassert.h],
        [],
        [
            AC_MSG_ERROR(The nlassert header "$ac_header" is required but cannot be found.)
        ])
    ]
)

# Depending on whether nlassert has been configured for an internal
# location, its directory stem within this package needs to be set
# accordingly. In addition, if the location is internal, then we need
# to attempt to pull it down using the bootstrap makefile.

if test "${nl_with_nlassert}" = "internal"; then
    maybe_nlassert_dirstem="nlassert/repo"
    nlassert_dirstem="third_party/${maybe_nlassert_dirstem}"

    AC_MSG_NOTICE([attempting to create internal ${nlassert_dirstem}])

    ${MAKE-make} --no-print-directory -C ${srcdir} -f Makefile-bootstrap ${nlassert_dirstem}

    if test $? -ne 0; then
        AC_MSG_ERROR([failed to create ${nlassert_dirstem}. Please check your network connection or the correctness of 'repos.conf'])
    fi
else
    maybe_nlassert_dirstem=""
fi

AC_SUBST(NLASSERT_SUBDIRS, [${maybe_nlassert_dirstem}])
AM_CONDITIONAL([NLFAULTINJECTION_WITH_NLASSERT_INTERNAL], [test "${nl_with_nlassert}" = "internal"])

#
# Nlunit-test
#

if test "${nl_cv_build_tests}" = "yes"; then
    NL_WITH_PACKAGE(
        [Nlunit-test],
        [NLUNIT_TEST],
        [nlunit_test],
        [-lnlunit-test],
        [
	    # At this point, the internal Nlunit-test package will be neither
	    # configured nor built, so the normal checks we undertake for an
	    # external package cannot be run here. Simply set the appropriate
	    # variables and trust all will be well.

            NLUNIT_TEST_CPPFLAGS="-I\${abs_top_srcdir}/third_party/nlunit-test/repo/src"
            NLUNIT_TEST_LDFLAGS="-L${ac_pwd}/third_party/nlunit-test/repo/src"
            NLUNIT_TEST_LIBS="-lnlunit-test"
        ],
        [
            # Check for required nlunit-test headers.

            AC_CHECK_HEADERS([nlunit-test.h],
            [],
            [
                AC_MSG_ERROR(The nlunit-test header "$ac_header" is required but cannot be found.)
            ])
        ])
fi

# Depending on whether nlunit-test has been configured for an internal
# location, its directory stem within this package needs to be set
# accordingly. In addition, if the location is internal, then we need
# to attempt to pull it down using the bootstrap makefile.

if test "${nl_with_nlunit_test}" = "internal"; then
    maybe_nlunit_test_dirstem="nlunit-test/repo"
    nlunit_test_dirstem="third_party/${maybe_nlunit_test_dirstem}"

    AC_MSG_NOTICE([attempting to create internal ${nlunit_test_dirstem}])

    ${MAKE-make} --no-print-directory -C ${srcdir} -f Makefile-bootstrap ${nlunit_test_dirstem}

    if test $? -ne 0; then
        AC_MSG_ERROR([failed to create ${nlunit_test_dirstem}. Please check your network connection or the correctness of 'repos.conf'])
    fi
else
    maybe_nlunit_test_dirstem=""
fi

AC_SUBST(NLUNIT_TEST_SUBDIRS, [${maybe_nlunit_test_dirstem}])
AM_CONDITIONAL([NLFAULTINJECTION_WITH_NLUNIT_TEST_INTERNAL], [test "${nl_with_nlunit_test}" = "internal"])

#
# Check for headers
#
AC_HEADER_STDBOOL
AC_HEADER_STDC

AC_CHECK_HEADERS([stdint.h])
AC_CHECK_HEADERS([string.h])
AC_CHECK_HEADERS([stdlib.h])

#
# Check for types and structures
#
AC_TYPE_INT8_T
AC_TYPE_INT16_T
AC_TYPE_INT32_T
AC_TYPE_INT64_T
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T

#
# Checks for library functions
#

if test "${ac_no_link}" != "yes"; then
    AC_CHECK_FUNCS([rand])
fi

# Add any nlassert CPPFLAGS, LDFLAGS, and LIBS

CPPFLAGS="${CPPFLAGS} ${NLASSERT_CPPFLAGS}"
LDFLAGS="${LDFLAGS} ${NLASSERT_LDFLAGS}"
LIBS="${LIBS} ${NLASSERT_LIBS}"

# Add any nlunit-test CPPFLAGS, LDFLAGS, and LIBS

CPPFLAGS="${CPPFLAGS} ${NLUNIT_TEST_CPPFLAGS}"
LDFLAGS="${LDFLAGS} ${NLUNIT_TEST_LDFLAGS}"
LIBS="${LIBS} ${NLUNIT_TEST_LIBS}"

# Add any code coverage CPPFLAGS and LIBS

CPPFLAGS="${CPPFLAGS} ${NL_COVERAGE_CPPFLAGS}"
LIBS="${LIBS} ${NL_COVERAGE_LIBS}"

# At this point, we can restore the compiler flags to whatever the
# user passed in, now that we're clear of an -Werror issues by
# transforming -Wno-error back to -Werror.

NL_RESTORE_WERROR

# Configure any autotools-based subdirectories

if test "${nl_with_nlassert}" = "internal"; then
    AC_CONFIG_SUBDIRS([third_party/nlassert/repo])
fi

if test "${nl_with_nlunit_test}" = "internal"; then
    AC_CONFIG_SUBDIRS([third_party/nlunit-test/repo])
fi

#
# Identify the various makefiles and auto-generated files for the package
#
AC_CONFIG_FILES([
Makefile
third_party/Makefile
include/Makefile
src/Makefile
tests/Makefile
doc/Makefile
])

#
# Generate the auto-generated files for the package
#
AC_OUTPUT

#
# Summarize the package configuration
#

AC_MSG_NOTICE([

  Configuration Summary
  ---------------------
  Package                                   : ${PACKAGE_NAME}
  Version                                   : ${PACKAGE_VERSION}
  Interface                                 : ${LIBNLFAULTINJECTION_VERSION_INFO//:/.}
  Build system                              : ${build}
  Host system                               : ${host}
  Target system                             : ${target}
  Target architecture                       : ${target_cpu}
  Target OS                                 : ${target_os}
  Target style                              : ${TARGET_STYLE}
  Cross compiling                           : ${cross_compiling}
  Build shared libraries                    : ${enable_shared}
  Build static libraries                    : ${enable_static}
  Build debug libraries                     : ${nl_cv_build_debug}
  Build optimized libraries                 : ${nl_cv_build_optimized}
  Build coverage libraries                  : ${nl_cv_build_coverage}
  Build coverage reports                    : ${nl_cv_build_coverage_reports}
  Lcov                                      : ${LCOV:--}
  Genhtml                                   : ${GENHTML:--}
  Build tests                               : ${nl_cv_build_tests}
  NLFAULTINJECTION tests                    : ${with_tests}
  Prefix                                    : ${prefix}
  Documentation support                     : ${nl_cv_build_docs}
  Doxygen                                   : ${DOXYGEN:--}
  GraphViz dot                              : ${DOT:--}
  Nlassert source                           : ${nl_with_nlassert:--}
  Nlassert compile flags                    : ${NLASSERT_CPPFLAGS:--}
  Nlassert link flags                       : ${NLASSERT_LDFLAGS:--}
  Nlassert link libraries                   : ${NLASSERT_LIBS:--}
  Nlunit-test source                        : ${nl_with_nlunit_test:--}
  Nlunit-test compile flags                 : ${NLUNIT_TEST_CPPFLAGS:--}
  Nlunit-test link flags                    : ${NLUNIT_TEST_LDFLAGS:--}
  Nlunit-test link libraries                : ${NLUNIT_TEST_LIBS:--}
  C Preprocessor                            : ${CPP}
  C Compiler                                : ${CC}
  C++ Preprocessor                          : ${CXXCPP}
  C++ Compiler                              : ${CXX}
  Archiver                                  : ${AR}
  Archive Indexer                           : ${RANLIB}
  Symbol Stripper                           : ${STRIP}
  Object Copier                             : ${OBJCOPY}
  C Preprocessor flags                      : ${CPPFLAGS:--}
  C Compile flags                           : ${CFLAGS:--}
  C++ Compile flags                         : ${CXXFLAGS:--}
  Link flags                                : ${LDFLAGS:--}
  Link libraries                            : ${LIBS}
  Pretty                                    : ${PRETTY:--}
  Pretty args                               : ${PRETTY_ARGS:--}
  Pretty check                              : ${PRETTY_CHECK:--}
  Pretty check args                         : ${PRETTY_CHECK_ARGS:--}
])