defineReplace(qtMakeExpand) {
    out = "$$1"
    for(ever) {
        m = $$replace(out, ".*\\$\\(EXPORT_([^)]+)\\).*", \\1)
        equals(m, $$out): \
            return($$out)
        out = $$replace(out, "\\$\\(EXPORT_$$m\\)", $$eval($$m))
    }
}

defineTest(qtCompilerErrror) {
    !cross_compile: \
        what =
    else: host_build: \
        what = " host"
    else: \
        what = " target"
    msg = \
        "Cannot run$$what compiler '$$1'. Output:" \
        "===================" \
        $$2 \
        "===================" \
        "Maybe you forgot to setup the environment?"
    error($$join(msg, $$escape_expand(\\n)))
}

cross_compile:host_build: \
    target_prefix = QMAKE_HOST_CXX
else: \
    target_prefix = QMAKE_CXX

isEmpty($${target_prefix}.INCDIRS) {
    #
    # Get default include and library paths from compiler
    #
    gcc {
        cmd_suffix = "<$$QMAKE_SYSTEM_NULL_DEVICE >$$QMAKE_SYSTEM_NULL_DEVICE"
        equals(QMAKE_HOST.os, Windows): \
            cmd_prefix = "set LC_ALL=C&"
        else: \
            cmd_prefix = "LC_ALL=C"

        cxx_flags = $$QMAKE_CXXFLAGS

        # Manually inject the sysroot for Apple Platforms because its resolution
        # normally does not happen until default_post.prf. This is especially
        # important for moc to gain the correct default include directory list.
        # While technically incorrect but without any likely practical effect,
        # UIKit simulator platforms will see the device SDK's sysroot in
        # QMAKE_DEFAULT_*DIRS, because they're handled in a single build pass.
        darwin {
            uikit:macx-xcode: \
                cxx_flags += -isysroot $$sdk_path_device.value
            else: \
                cxx_flags += -isysroot $$QMAKE_MAC_SDK_PATH
        }

        rim_qcc: \
            # Need the cc1plus and ld command lines to pick up the paths
            cxx_flags += $$QMAKE_LFLAGS_SHLIB -o $$QMAKE_SYSTEM_NULL_DEVICE -v
        else: darwin:clang: \
            # Need to link to pick up library paths
            cxx_flags += $$QMAKE_LFLAGS_SHLIB -o /dev/null -v -Wl,-v
        else: \
            # Just preprocess, might not pick up library paths
            cxx_flags += -E -v

        output = $$system("$$cmd_prefix $$QMAKE_CXX $$qtMakeExpand($$cxx_flags) -xc++ - 2>&1 $$cmd_suffix", lines, ec)
        !equals(ec, 0): qtCompilerErrror($$QMAKE_CXX, $$output)

        rim_qcc {
            for (line, output) {
                contains(line, "^[^ ]*cc1plus .*") {
                    take_next = false
                    for (parameter, $$list($$line)) {
                        $$take_next {
                            QMAKE_DEFAULT_INCDIRS += $$clean_path($$parameter)
                            take_next = false
                        } else: equals(parameter, "-isystem") {
                            take_next = true
                        }
                    }
                } else: contains(line, "^[^ ]*-ld .*") {
                    for (parameter, $$list($$line)) {
                        contains(parameter, "^-L.*") {
                            parameter ~= s/^-L//
                            QMAKE_DEFAULT_LIBDIRS += $$clean_path($$parameter)
                        }
                    }
                }
            }
        } else {
            add_includes = false
            add_libraries = false
            for (line, output) {
                line ~= s/^[ \\t]*//  # remove leading spaces
                contains(line, "LIBRARY_PATH=.*") {
                    line ~= s/^LIBRARY_PATH=//  # remove leading LIBRARY_PATH=
                    paths = $$split(line, $$QMAKE_DIRLIST_SEP)
                    for (path, paths): \
                        QMAKE_DEFAULT_LIBDIRS += $$clean_path($$path)
                } else: contains(line, "Library search paths:") {
                    add_libraries = true
                } else: contains(line, "$${LITERAL_HASH}include <.*") {  # #include <...> search starts here:
                    add_includes = true
                } else: contains(line, "End of search.*") {
                    add_includes = false
                } else: $$add_libraries {
                    # We assume all library search paths are absolute
                    !contains(line, "^/.*") {
                        add_libraries = false
                        next()
                    }
                    QMAKE_DEFAULT_LIBDIRS += $$clean_path($$line)
                } else: $$add_includes {
                    !contains(line, ".* \\(framework directory\\)"): \
                        QMAKE_DEFAULT_INCDIRS += $$clean_path($$line)
                }
            }
        }
        if(!darwin:clang)|intel_icc {
            # Clang on a non-Apple system (that is, a system without ld64 -- say, with GNU ld
            # or gold under Linux) will not print any library search path. Need to use another
            # invocation with different options (which in turn doesn't print include search
            # paths, so it can't just be used in place of the above code).
            # What's more, -print-search-dirs can't be used on clang on Apple because it
            # won't print all the library paths (only the clang-internal ones).
            output = $$system("$$cmd_prefix $$QMAKE_CXX -print-search-dirs", lines, ec)
            !equals(ec, 0): qtCompilerErrror($$QMAKE_CXX, $$output)

            for (line, output) {
                contains(line, "^libraries: .*") {
                    line ~= s,^libraries: ,,
                    paths = $$split(line, $$QMAKE_DIRLIST_SEP)
                    for (path, paths): \
                        QMAKE_DEFAULT_LIBDIRS += $$clean_path($$replace(path, ^=, $$[SYSROOT]))
                }
            }
        }
        isEmpty(QMAKE_DEFAULT_LIBDIRS)|isEmpty(QMAKE_DEFAULT_INCDIRS): \
            !integrity: \
                error("failed to parse default search paths from compiler output")
        QMAKE_DEFAULT_LIBDIRS = $$unique(QMAKE_DEFAULT_LIBDIRS)
    } else: msvc {
        # This doesn't differentiate between host and target,
        # but neither do the compilers.
        LIB = $$getenv("LIB")
        QMAKE_DEFAULT_LIBDIRS = $$split(LIB, $$QMAKE_DIRLIST_SEP)
        INCLUDE = $$getenv("INCLUDE")
        QMAKE_DEFAULT_INCDIRS = $$split(INCLUDE, $$QMAKE_DIRLIST_SEP)
    }

    unix {
        isEmpty(QMAKE_DEFAULT_INCDIRS): QMAKE_DEFAULT_INCDIRS = /usr/include /usr/local/include
        isEmpty(QMAKE_DEFAULT_LIBDIRS): QMAKE_DEFAULT_LIBDIRS = /lib /usr/lib
    }

    cache($${target_prefix}.INCDIRS, set stash, QMAKE_DEFAULT_INCDIRS)
    cache($${target_prefix}.LIBDIRS, set stash, QMAKE_DEFAULT_LIBDIRS)
} else {
    QMAKE_DEFAULT_INCDIRS = $$eval($${target_prefix}.INCDIRS)
    QMAKE_DEFAULT_LIBDIRS = $$eval($${target_prefix}.LIBDIRS)
}

#
# Determine and cache the compiler version
#

defineReplace(qtVariablesFromMSVC) {
    ret = $$system("$$1 -nologo -E $$2 $$system_quote($$PWD/data/macros.cpp) <NUL 2>NUL", lines, ec)
    !equals(ec, 0): qtCompilerErrror($$1, $$ret)
    return($$ret)
}

defineReplace(qtVariablesFromGCC) {
    ret = $$system("$$1 -E $$system_quote($$PWD/data/macros.cpp) \
        <$$QMAKE_SYSTEM_NULL_DEVICE 2>$$QMAKE_SYSTEM_NULL_DEVICE", lines, ec)
    !equals(ec, 0): qtCompilerErrror($$1, $$ret)
    return($$ret)
}

isEmpty($${target_prefix}.COMPILER_MACROS) {
    msvc {
        clang_cl {
            # We need to obtain the cl.exe version first
            vars = $$qtVariablesFromMSVC(cl)
            for (v, vars) {
                isEmpty(v)|contains(v, $${LITERAL_HASH}.*): next()
                eval($$v)
            }
            isEmpty(QMAKE_MSC_FULL_VER): error("Could not determine the Visual Studio version")

            QMAKE_CFLAGS_MSVC_COMPAT = $$replace(QMAKE_MSC_FULL_VER, "(..)(..)(.*)", \
                                                 "-fms-compatibility-version=\\1.\\2.\\3")
            cache($${target_prefix}.QMAKE_CFLAGS_MSVC_COMPAT, set stash, QMAKE_CFLAGS_MSVC_COMPAT)
            $${target_prefix}.COMPILER_MACROS += QMAKE_CFLAGS_MSVC_COMPAT
            vars = $$qtVariablesFromMSVC($$QMAKE_CXX, $$QMAKE_CFLAGS_MSVC_COMPAT)
        } else {
            vars = $$qtVariablesFromMSVC($$QMAKE_CXX)
        }
    } else: gcc {
        vars = $$qtVariablesFromGCC($$QMAKE_CXX)
    }
    for (v, vars) {
        contains(v, $${LITERAL_HASH}.*)|contains(v, " *"): next()
        # Set both <varname> for the outer scope ...
        eval($$v)
        v ~= s/ .*//
        isEmpty($$v): error("Compiler produced empty value for $${v}.")
        # ... and save QMAKE_(HOST_)?CXX.<varname> in the cache.
        cache($${target_prefix}.$$v, set stash, $$v)
        $${target_prefix}.COMPILER_MACROS += $$v
    }
    cache($${target_prefix}.COMPILER_MACROS, set stash)
} else {
    # load from the cache
    for (i, $${target_prefix}.COMPILER_MACROS): \
        $$i = $$eval($${target_prefix}.$$i)
}

unset(target_prefix)

# Populate QMAKE_COMPILER_DEFINES and some compatibility variables.
# The $$format_number() calls strip leading zeros to avoid misinterpretation as octal.
QMAKE_COMPILER_DEFINES += __cplusplus=$$QT_COMPILER_STDCXX
!isEmpty(QMAKE_MSC_VER): \
    QMAKE_COMPILER_DEFINES += _MSC_VER=$$QMAKE_MSC_VER _MSC_FULL_VER=$$QMAKE_MSC_FULL_VER
!isEmpty(QMAKE_ICC_VER): \
    QMAKE_COMPILER_DEFINES += __INTEL_COMPILER=$$QMAKE_ICC_VER __INTEL_COMPILER_UPDATE=$$QMAKE_ICC_UPDATE_VER
!isEmpty(QMAKE_APPLE_CC): \
    QMAKE_COMPILER_DEFINES += __APPLE_CC__=$$QMAKE_APPLE_CC
!isEmpty(QMAKE_APPLE_CLANG_MAJOR_VERSION): \
    QMAKE_COMPILER_DEFINES += __clang__ \
        __clang_major__=$$QMAKE_APPLE_CLANG_MAJOR_VERSION \
        __clang_minor__=$$QMAKE_APPLE_CLANG_MINOR_VERSION \
        __clang_patchlevel__=$$QMAKE_APPLE_CLANG_PATCH_VERSION
!isEmpty(QMAKE_CLANG_MAJOR_VERSION): \
    QMAKE_COMPILER_DEFINES += __clang__ \
        __clang_major__=$$QMAKE_CLANG_MAJOR_VERSION \
        __clang_minor__=$$QMAKE_CLANG_MINOR_VERSION \
        __clang_patchlevel__=$$QMAKE_CLANG_PATCH_VERSION
!isEmpty(QMAKE_GCC_MAJOR_VERSION): \
    QMAKE_COMPILER_DEFINES += \
        __GNUC__=$$QMAKE_GCC_MAJOR_VERSION \
        __GNUC_MINOR__=$$QMAKE_GCC_MINOR_VERSION \
        __GNUC_PATCHLEVEL__=$$QMAKE_GCC_PATCH_VERSION

QMAKE_CFLAGS += $$QMAKE_CFLAGS_MSVC_COMPAT
QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_MSVC_COMPAT

msvc:!intel_icl:!clang_cl: include(../common/msvc-version.conf)