AC_INIT([util-cruft], [0.1.0], [danny@nerdcruft.net])
## Explicitly set an empty CXXFLAGS if not present to prevent AC_PROG_CXX from
## generating a default -O2. This allows us to manually select -O0 when
## debugging is enabled.
: ${CXXFLAGS=""}

###############################################################################
## Build environment discovery

AC_CONFIG_AUX_DIR([build-aux])
AC_REQUIRE_AUX_FILE([tap-driver.sh])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_MACRO_DIR([m4/nc])

AC_USE_SYSTEM_EXTENSIONS
AC_CANONICAL_HOST

AC_LANG([C++])

NC_CXX
NC_PLATFORM
NC_OPTIMISATION
NC_WARNINGS
# NC_DEBUGGING is called further down, see notes at the call site.

LT_INIT

AM_INIT_AUTOMAKE([1.15 foreign dist-xz subdir-objects])
AM_SILENT_RULES([yes])
AM_MAINTAINER_MODE([enable])

AC_CONFIG_HEADERS([config.h])

AX_CHECK_GNU_MAKE

###############################################################################
## Architecture features

AC_C_BIGENDIAN

###############################################################################
## Useful headers or platform features

###############################################################################
## Platform features

## Find some POSIX functions that windows doesn't support
AS_IF([test "x${host_os}" != "xmingw32"],[
    AC_SEARCH_LIBS([dlopen], [dl], [], [AC_MSG_ERROR([unable to find dl library])])
    AC_SEARCH_LIBS([shm_open], [rt], [], [AC_MSG_ERROR([unable to find shm library])])
])

AC_FUNC_MMAP

AC_CHECK_HEADERS([experimental/filesystem])
AM_CONDITIONAL([HAVE_STD_EXPERIMENTAL_FILESYSTEM], [test "x$ac_cv_header_experimental_filesystem" == "xyes"])

AC_SEARCH_LIBS([backtrace], [execinfo])
AC_CHECK_FUNC([backtrace])
AM_CONDITIONAL([HAVE_EXECINFO], [test "x$ac_cv_func_backtrace" == "xyes"])

AC_CHECK_FUNC([RtlCaptureStackBackTrace])
AM_CONDITIONAL([HAVE_CAPTURESTACKBACKTRACE], [test "x$ac_cv_func_RtlCaptureStackBackTrace" == "xyes"])

AC_MSG_CHECKING([for SymFromAddr])
save_LIBS="$LIBS"
LIBS="${LIBS} -ldbghelp"
AC_LINK_IFELSE([AC_LANG_PROGRAM(
[
#include <windows.h>
#include <dbghelp.h>
],
[SymFromAddr(nullptr,0,nullptr,nullptr); return 0;])],[
    AC_MSG_RESULT([yes])
], [
    AC_MSG_RESULT([no])
    LIBS="$save_LIBS"
])


AC_SEARCH_LIBS([clock_gettime], [rt c], [], [
    # windows doesn't have clock_gettime
    AS_IF([test "x${host_os}" != "xmingw32"], [
        AC_MSG_ERROR([unable to find the clock library])
    ])
])

AC_SEARCH_LIBS([cos], [m], [], [AC_MSG_ERROR([unable to find the maths library])])


###############################################################################
## Debug features

dnl debugging might enable sanitizers, which might alter the available
dnl libraries, so this needs to be called after we've completed our tests.
dnl specifically: -ldl is implied by some of the sanitizers.
NC_DEBUGGING

###############################################################################
## Documentation

###############################################################################
## Required packages

CHECK_RAGEL([ip.cpp])

###############################################################################
## Optional packages

AC_CHECK_TOOL([ADDR2LINE], [addr2line], [:])
AS_IF([test "x$ADDR2LINE" != "x:"], [
    AC_DEFINE_UNQUOTED([ADDR2LINE], ["$ADDR2LINE"], [addr2line tool name])
])

###############################################################################
## Performance and build optimisations

###############################################################################
## Output

AC_SUBST(LIBS)

# inclusion of config.h has to go after compilation tests otherwise we risk
# failure on a clean build
AX_APPEND_FLAG([-include config.h])

NC_SUBPACKAGE([cruft-util])

AC_CONFIG_FILES([
    Doxyfile
    Makefile
])

AC_CONFIG_FILES([test/json-parse.sh],  [chmod a+x test/json-parse.sh])
AC_CONFIG_FILES([test/json-schema.py], [chmod a+x test/json-schema.py])

AC_OUTPUT