# The following defines affect the environment configuration tests are run in:
# CMAKE_REQUIRED_DEFINITIONS, CMAKE_REQUIRED_FLAGS, CMAKE_REQUIRED_LIBRARIES,
# and CMAKE_REQUIRED_INCLUDES
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE=1)
include(CMakePushCheckState)

# An unrecognized flag is usually a warning and not an error, which CMake apparently does
# not pick up on. Combine it with -Werror to determine if it's actually supported.
# This is not bulletproof; old versions of GCC only emit a warning about unrecognized warning
# options when there are other warnings to emit :rolleyes:
# See https://github.com/fish-shell/fish-shell/commit/fe2da0a9#commitcomment-47431659

# Try using CMake's own logic to locate curses/ncurses
find_package(Curses)
if(NOT ${CURSES_FOUND})
    # CMake has trouble finding platform-specific system libraries
    # installed to multiarch paths (e.g. /usr/lib/x86_64-linux-gnu)
    # if not symlinked or passed in as a manual define.
    message("Falling back to pkg-config for (n)curses detection")
    include(FindPkgConfig)
    pkg_search_module(CURSES REQUIRED ncurses curses)
    set(CURSES_CURSES_LIBRARY ${CURSES_LIBRARIES})
    set(CURSES_LIBRARY ${CURSES_LIBRARIES})
endif()

# Fix undefined reference to tparm on RHEL 6 and potentially others
# If curses is found via CMake, it also links against tinfo if it exists. But if we use our
# fallback pkg-config logic above, we need to do this manually.
find_library(CURSES_TINFO tinfo)
if (CURSES_TINFO)
    set(CURSES_LIBRARY ${CURSES_LIBRARY} ${CURSES_TINFO})
else()
    # on NetBSD, libtinfo has a longer name (libterminfo)
    find_library(CURSES_TINFO terminfo)
    if (CURSES_TINFO)
        set(CURSES_LIBRARY ${CURSES_LIBRARY} ${CURSES_TINFO})
    endif()
endif()

# Set up the config.h file.
set(PACKAGE_NAME "fish")
set(PACKAGE_TARNAME "fish")
include(CheckCXXSymbolExists)
include(CheckCXXSourceCompiles)
include(CheckTypeSize)

# workaround for lousy mtime precision on a Linux kernel
if (CMAKE_SYSTEM_NAME MATCHES "Linux|Android")
    check_cxx_symbol_exists(clock_gettime time.h HAVE_CLOCK_GETTIME)
    check_cxx_symbol_exists(futimens sys/stat.h HAVE_FUTIMENS)
    if ((HAVE_CLOCK_GETTIME) AND (HAVE_FUTIMENS))
        set(UVAR_FILE_SET_MTIME_HACK 1)
    endif()
endif()

check_cxx_symbol_exists(gettext libintl.h HAVE_GETTEXT)

check_type_size("wchar_t[8]" WCHAR_T_BITS LANGUAGE CXX)

# Work around the fact that cmake does not propagate the language standard flag into
# the CHECK_CXX_SOURCE_COMPILES function. See CMake issue #16456.
# Ensure we do this after the FIND_PACKAGE calls which use C, and will error on a C++
# standards flag.
# Also see https://github.com/fish-shell/fish-shell/issues/5865
if(NOT POLICY CMP0067)
  list(APPEND CMAKE_REQUIRED_FLAGS "${CMAKE_CXX${CMAKE_CXX_STANDARD}_EXTENSION_COMPILE_OPTION}")
endif()

check_cxx_source_compiles("
#include <sys/wait.h>

int main() {
    static_assert(WEXITSTATUS(0x007f) == 0x7f, \"This is our message we need to add because C++ is terrible\");
    return 0;
}
"
HAVE_WAITSTATUS_SIGNAL_RET)