/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/* Source fragment for the Clownfish runtime's charmonizer.c.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Charmonizer/Probe.h"
#include "Charmonizer/Probe/AtomicOps.h"
#include "Charmonizer/Probe/BuildEnv.h"
#include "Charmonizer/Probe/DirManip.h"
#include "Charmonizer/Probe/Floats.h"
#include "Charmonizer/Probe/FuncMacro.h"
#include "Charmonizer/Probe/Headers.h"
#include "Charmonizer/Probe/Integers.h"
#include "Charmonizer/Probe/LargeFiles.h"
#include "Charmonizer/Probe/Memory.h"
#include "Charmonizer/Probe/SymbolVisibility.h"
#include "Charmonizer/Probe/VariadicMacros.h"
#include "Charmonizer/Core/HeaderChecker.h"
#include "Charmonizer/Core/CLI.h"
#include "Charmonizer/Core/ConfWriter.h"
#include "Charmonizer/Core/ConfWriterC.h"
#include "Charmonizer/Core/ConfWriterPerl.h"
#include "Charmonizer/Core/ConfWriterRuby.h"

typedef struct cfish_MakeFile {
    chaz_MakeFile   *makefile;
    chaz_MakeBinary *lib;
    chaz_MakeBinary *test_lib;
    chaz_MakeVar    *cfh_var;
    chaz_CLI        *cli;

    /* Directories and files. */
    const char  *base_dir;
    const char  *host_src_dir;
    char        *core_dir;
    char        *test_dir;
    char        *autogen_src_dir;
    char        *autogen_inc_dir;
    char        *autogen_target;
} cfish_MakeFile;

static const char cfish_version[]       = "0.6.2";
static const char cfish_major_version[] = "0.6";

static void
S_add_compiler_flags(struct chaz_CLI *cli);

static chaz_CFlags*
S_link_flags(chaz_CLI *cli);

static cfish_MakeFile*
cfish_MakeFile_new(chaz_CLI *cli);

static void
cfish_MakeFile_destroy(cfish_MakeFile *self);

static void
cfish_MakeFile_write(cfish_MakeFile *self, chaz_CFlags *extra_link_flags);

static void
cfish_MakeFile_write_c_cfc_rules(cfish_MakeFile *self);

static void
cfish_MakeFile_write_c_test_rules(cfish_MakeFile *self);

static void
S_cfh_file_callback(const char *dir, char *file, void *context);

static int
S_ends_with(const char *string, const char *postfix);

static int
S_need_libpthread(chaz_CLI *cli);

int main(int argc, const char **argv) {
    chaz_CFlags *link_flags;

    /* Initialize. */
    chaz_CLI *cli
        = chaz_CLI_new(argv[0], "charmonizer: Probe C build environment");
    chaz_CLI_register(cli, "host", "specify host binding language",
                      CHAZ_CLI_ARG_REQUIRED);
    chaz_CLI_register(cli, "disable-threads", "whether to disable threads",
                      CHAZ_CLI_NO_ARG);
    chaz_CLI_set_usage(cli, "Usage: charmonizer [OPTIONS] [-- [CFLAGS]]");
    if (!chaz_Probe_parse_cli_args(argc, argv, cli)) {
        chaz_Probe_die_usage();
    }
    if (!chaz_CLI_defined(cli, "host")) {
        chaz_CLI_set(cli, "host", "c");
    }
    chaz_Probe_init(cli);
    S_add_compiler_flags(cli);

    /* Employ integer features but don't define stdint types in charmony.h. */
    chaz_ConfWriter_append_conf(
        "#define CHY_EMPLOY_INTEGERLIMITS\n"
        "#define CHY_EMPLOY_INTEGERLITERALS\n"
        "#define CHY_EMPLOY_INTEGERFORMATSTRINGS\n\n"
    );

    /* Run probe modules. Booleans, DirManip and LargeFiles are only needed for
     * the Charmonizer tests.
     */
    chaz_BuildEnv_run();
    chaz_DirManip_run();
    chaz_Headers_run();
    chaz_AtomicOps_run();
    chaz_FuncMacro_run();
    chaz_Booleans_run();
    chaz_Integers_run();
    chaz_Floats_run();
    chaz_LargeFiles_run();
    chaz_Memory_run();
    chaz_VariadicMacros_run();

    /* Local definitions. */
    chaz_ConfWriter_start_module("LocalDefinitions");
    if (chaz_HeadCheck_defines_symbol("__sync_bool_compare_and_swap", "")) {
        chaz_ConfWriter_add_def("HAS___SYNC_BOOL_COMPARE_AND_SWAP", NULL);
    }
    link_flags = S_link_flags(cli);
    chaz_ConfWriter_add_def("EXTRA_LDFLAGS",
                            chaz_CFlags_get_string(link_flags));
    chaz_ConfWriter_end_module();

    /* Write custom postamble. */
    chaz_ConfWriter_append_conf(
        "#ifdef CHY_HAS_SYS_TYPES_H\n"
        "  #include <sys/types.h>\n"
        "#endif\n\n"
    );
    chaz_ConfWriter_append_conf(
        "#ifdef CHY_HAS_ALLOCA_H\n"
        "  #include <alloca.h>\n"
        "#elif defined(CHY_HAS_MALLOC_H)\n"
        "  #include <malloc.h>\n"
        "#elif defined(CHY_ALLOCA_IN_STDLIB_H)\n"
        "  #include <stdlib.h>\n"
        "#endif\n\n"
    );
    chaz_ConfWriter_append_conf(
        "#ifdef CHY_HAS_WINDOWS_H\n"
        "  /* Target Windows XP. */\n"
        "  #ifndef WINVER\n"
        "    #define WINVER 0x0500\n"
        "  #endif\n"
        "  #ifndef _WIN32_WINNT\n"
        "    #define _WIN32_WINNT 0x0500\n"
        "  #endif\n"
        "#endif\n\n"
    );

    if (chaz_CLI_defined(cli, "enable-makefile")) {
        cfish_MakeFile *mf = cfish_MakeFile_new(cli);
        cfish_MakeFile_write(mf, link_flags);
        cfish_MakeFile_destroy(mf);
    }

    /* Clean up. */
    chaz_CFlags_destroy(link_flags);
    chaz_CLI_destroy(cli);
    chaz_Probe_clean_up();

    return 0;
}

static void
S_add_compiler_flags(struct chaz_CLI *cli) {
    chaz_CFlags *extra_cflags = chaz_CC_get_extra_cflags();

    if (chaz_Probe_gcc_version_num()) {
        if (!chaz_CC_is_mingw()) {
            /* When using the MSVCRT, -pedantic complains about %I64 format
             * specifiers.
             */
            chaz_CFlags_append(extra_cflags, "-pedantic");
        }
        chaz_CFlags_append(extra_cflags, "-Wall -Wextra -Wno-variadic-macros");
        if (strcmp(chaz_CLI_strval(cli, "host"), "perl") == 0) {
            chaz_CFlags_append(extra_cflags, "-DPERL_GCC_PEDANTIC");
        }

        /* Only core source files require this -- not our headers and
         * autogenerated files. */
        chaz_CFlags_append(extra_cflags, "-std=gnu99 -D_GNU_SOURCE");

        if (chaz_CLI_defined(cli, "enable-coverage")) {
            /* Some code paths in the float/int comparison code aren't
             * triggered if excess precision is allowed. */
            chaz_CFlags_append(extra_cflags, "-ffloat-store");
        }
    }
    else if (chaz_Probe_msvc_version_num()) {
        if (chaz_Probe_msvc_version_num() < 1800) {
            /* Compile as C++ under MSVC11 and below. */
            chaz_CFlags_append(extra_cflags, "/TP");
        }

        chaz_CFlags_append(extra_cflags, "/W3");
        /* Thwart stupid warnings. */
        chaz_CFlags_append(extra_cflags, "/D_CRT_SECURE_NO_WARNINGS");
        chaz_CFlags_append(extra_cflags, "/D_SCL_SECURE_NO_WARNINGS");

        if (chaz_Probe_msvc_version_num() < 1300) {
            /* Redefine 'for' to fix broken 'for' scoping under MSVC6. */
            chaz_CFlags_append(extra_cflags, "/Dfor=\"if(0);else for\"");
        }
    }

    chaz_CFlags_hide_symbols(extra_cflags);

    if (chaz_CLI_defined(cli, "disable-threads")) {
        chaz_CFlags_append(extra_cflags, "-DCFISH_NOTHREADS");
    }
}

static chaz_CFlags*
S_link_flags(chaz_CLI *cli) {
    chaz_CFlags *link_flags   = chaz_CC_new_cflags();
    const char  *math_library = chaz_Floats_math_library();

    if (math_library) {
        chaz_CFlags_add_external_lib(link_flags, math_library);
    }
    if (S_need_libpthread(cli)) {
        chaz_CFlags_add_external_lib(link_flags, "pthread");
    }
    if (chaz_CLI_defined(cli, "enable-coverage")) {
        chaz_CFlags_enable_code_coverage(link_flags);
    }

    return link_flags;
}

static cfish_MakeFile*
cfish_MakeFile_new(chaz_CLI *cli) {
    const char *dir_sep = chaz_OS_dir_sep();
    char *cfcore_filename = chaz_Util_join(dir_sep, "cfcore", "Clownfish.cfp",
                                           NULL);
    cfish_MakeFile *self = malloc(sizeof(cfish_MakeFile));

    self->makefile = chaz_MakeFile_new();
    self->lib      = NULL;
    self->test_lib = NULL;
    self->cfh_var  = NULL;
    self->cli      = cli;

    if (chaz_Util_can_open_file(cfcore_filename)) {
        self->base_dir = ".";
        self->core_dir = chaz_Util_strdup("cfcore");
        self->test_dir = chaz_Util_strdup("cftest");
    }
    else {
        self->base_dir = "..";
        self->core_dir = chaz_Util_join(dir_sep, "..", "core", NULL);
        self->test_dir = chaz_Util_join(dir_sep, "..", "test", NULL);
    }

    self->autogen_src_dir = chaz_Util_join(dir_sep, "autogen", "source", NULL);
    self->autogen_inc_dir
        = chaz_Util_join(dir_sep, "autogen", "include", NULL);
    self->autogen_target
        = chaz_Util_join(dir_sep, "autogen", "hierarchy.json", NULL);

    if (strcmp(chaz_CLI_strval(cli, "host"), "go") == 0) {
        /* TODO: Let Go bindings build code in "ext". */
        self->host_src_dir = "ext";
    }
    else if (chaz_CLI_defined(cli, "enable-python")) {
        /* TODO: Let Python bindings build code in "cfext". */
        self->host_src_dir = "cfext";
    }
    else if (strcmp(chaz_CLI_strval(cli, "host"), "c") == 0) {
        self->host_src_dir = "src";
    }
    else {
        self->host_src_dir = NULL;
    }

    free(cfcore_filename);
    return self;
}

static void
cfish_MakeFile_destroy(cfish_MakeFile *self) {
    chaz_MakeFile_destroy(self->makefile);

    free(self->core_dir);
    free(self->test_dir);
    free(self->autogen_inc_dir);
    free(self->autogen_src_dir);
    free(self->autogen_target);

    free(self);
}

static void
cfish_MakeFile_write(cfish_MakeFile *self, chaz_CFlags *extra_link_flags) {
    const char *dir_sep = chaz_OS_dir_sep();
    const char *host    = chaz_CLI_strval(self->cli, "host");

    const char *lib_objs      = NULL;
    const char *test_lib_objs = NULL;

    chaz_MakeVar  *var;
    chaz_MakeRule *rule;

    chaz_CFlags *extra_cflags = chaz_CC_get_extra_cflags();
    chaz_CFlags *makefile_cflags;
    chaz_CFlags *compile_flags;
    chaz_CFlags *link_flags;

    printf("Creating Makefile...\n");

    /* Directories */

    chaz_MakeFile_add_var(self->makefile, "BASE_DIR", self->base_dir);

    /* C compiler */

    chaz_MakeFile_add_var(self->makefile, "CC", chaz_CC_get_cc());

    makefile_cflags = chaz_CC_new_cflags();

    chaz_CFlags_enable_optimization(makefile_cflags);
    chaz_CFlags_enable_debugging(makefile_cflags);
    chaz_CFlags_disable_strict_aliasing(makefile_cflags);
    if (chaz_CLI_defined(self->cli, "enable-coverage")) {
        chaz_CFlags_enable_code_coverage(makefile_cflags);
    }

    chaz_CFlags_add_include_dir(makefile_cflags, ".");
    chaz_CFlags_add_include_dir(makefile_cflags, self->core_dir);
    if (self->host_src_dir) {
        chaz_CFlags_add_include_dir(makefile_cflags, self->host_src_dir);
    }
    chaz_CFlags_add_include_dir(makefile_cflags, self->autogen_inc_dir);

    var = chaz_MakeFile_add_var(self->makefile, "CFLAGS", NULL);
    chaz_MakeVar_append(var, chaz_CFlags_get_string(extra_cflags));
    chaz_MakeVar_append(var, chaz_CFlags_get_string(makefile_cflags));
    chaz_MakeVar_append(var, chaz_CC_get_cflags());

    chaz_CFlags_destroy(makefile_cflags);

    /* Core library. */

    if (strcmp(host, "c") == 0 || strcmp(host, "perl") == 0) {
        /* Shared library for C and Perl. */

        chaz_MakeFile_add_rule(self->makefile, "all",
                               "$(CLOWNFISH_SHARED_LIB)");

        self->lib
            = chaz_MakeFile_add_shared_lib(self->makefile, NULL, "clownfish",
                                           cfish_version, cfish_major_version);
        lib_objs = "$(CLOWNFISH_SHARED_LIB_OBJS)";

        compile_flags = chaz_MakeBinary_get_compile_flags(self->lib);
        chaz_CFlags_add_define(compile_flags, "CFP_CFISH", NULL);

        link_flags = chaz_MakeBinary_get_link_flags(self->lib);
        chaz_CFlags_enable_debugging(link_flags);
        chaz_CFlags_append(link_flags,
                           chaz_CFlags_get_string(extra_link_flags));
    }
    else {
        /* Static library for Go and Python. */

        chaz_MakeFile_add_rule(self->makefile, "static",
                               "$(CLOWNFISH_STATIC_LIB)"
                               " $(TESTCFISH_STATIC_LIB)");

        self->lib
            = chaz_MakeFile_add_static_lib(self->makefile, NULL, "clownfish");
        lib_objs = "$(CLOWNFISH_STATIC_LIB_OBJS)";

        if (strcmp(host, "python") == 0) {
            /* For Python, the static library is linked into a shared
             * library.
             */
            compile_flags = chaz_MakeBinary_get_compile_flags(self->lib);
            if (chaz_CC_msvc_version_num()) {
                /* Python uses /MT. */
                chaz_CFlags_append(compile_flags, "/MT");
            }
            else {
                chaz_CFlags_compile_shared_library(compile_flags);
            }
            chaz_CFlags_add_define(compile_flags, "CFP_CFISH", NULL);
            /* Test code isn't separated yet. */
            chaz_CFlags_add_define(compile_flags, "CFP_TESTCFISH", NULL);
        }
    }

    if (self->host_src_dir) {
        chaz_MakeBinary_add_src_dir(self->lib, self->host_src_dir);
    }
    chaz_MakeBinary_add_src_dir(self->lib, self->core_dir);
    chaz_MakeBinary_add_src_file(self->lib, self->autogen_src_dir,
                                 "cfish_parcel.c");

    /* Test library. */

    if (strcmp(host, "c") == 0 || strcmp(host, "perl") == 0) {
        /* Shared library for C and Perl. */

        self->test_lib
            = chaz_MakeFile_add_shared_lib(self->makefile, NULL, "testcfish",
                                           cfish_version, cfish_major_version);
        test_lib_objs = "$(TESTCFISH_SHARED_LIB_OBJS)";

        compile_flags = chaz_MakeBinary_get_compile_flags(self->test_lib);
        chaz_CFlags_add_define(compile_flags, "CFP_TESTCFISH", NULL);

        link_flags = chaz_MakeBinary_get_link_flags(self->test_lib);
        chaz_CFlags_enable_debugging(link_flags);
        chaz_CFlags_append(link_flags,
                           chaz_CFlags_get_string(extra_link_flags));
        chaz_CFlags_add_shared_lib(link_flags, NULL, "clownfish",
                                   cfish_major_version);

        chaz_MakeBinary_add_prereq(self->test_lib, "$(CLOWNFISH_SHARED_LIB)");
    }
    else {
        /* Static library for Go and Python. */

        self->test_lib
            = chaz_MakeFile_add_static_lib(self->makefile, NULL, "testcfish");
        test_lib_objs = "$(TESTCFISH_STATIC_LIB_OBJS)";

        if (strcmp(host, "python") == 0) {
            /* For Python, the static library is linked into a shared
             * library.
             */
            compile_flags = chaz_MakeBinary_get_compile_flags(self->test_lib);
            if (chaz_CC_msvc_version_num()) {
                /* Python uses /MT. */
                chaz_CFlags_append(compile_flags, "/MT");
            }
            else {
                chaz_CFlags_compile_shared_library(compile_flags);
            }
            chaz_CFlags_add_define(compile_flags, "CFP_TESTCFISH", NULL);
            /* Test code isn't separated yet. */
            chaz_CFlags_add_define(compile_flags, "CFP_CFISH", NULL);
        }
    }

    chaz_MakeBinary_add_src_dir(self->test_lib, self->test_dir);
    chaz_MakeBinary_add_src_file(self->test_lib, self->autogen_src_dir,
                                 "testcfish_parcel.c");

    /* Additional rules. */

    /* Object files depend on autogenerated headers. */
    chaz_MakeFile_add_rule(self->makefile, lib_objs, self->autogen_target);
    chaz_MakeFile_add_rule(self->makefile, test_lib_objs,
                           self->autogen_target);

    if (strcmp(host, "c") == 0) {
        cfish_MakeFile_write_c_cfc_rules(self);
        cfish_MakeFile_write_c_test_rules(self);
    }

    /* Targets to compile object files for Perl. */
    if (strcmp(host, "perl") == 0) {
        char *objects;

        chaz_MakeFile_add_rule(self->makefile, "core_objects",
                               "$(CLOWNFISH_SHARED_LIB_OBJS)");
        objects = chaz_MakeBinary_obj_string(self->lib);
        chaz_ConfWriter_add_def("CORE_OBJECTS", objects);
        free(objects);

        chaz_MakeFile_add_rule(self->makefile, "test_objects",
                               "$(TESTCFISH_SHARED_LIB_OBJS)");
        objects = chaz_MakeBinary_obj_string(self->test_lib);
        chaz_ConfWriter_add_def("TEST_OBJECTS", objects);
        free(objects);
    }

    chaz_MakeFile_write(self->makefile);
}

static void
cfish_MakeFile_write_c_cfc_rules(cfish_MakeFile *self) {
    static const char *const autogen_src_files[] = {
        "cfish_parcel.c",
        "testcfish_parcel.c",
        NULL
    };

    chaz_MakeRule *rule;

    const char *dir_sep  = chaz_OS_dir_sep();
    const char *exe_ext  = chaz_CC_exe_ext();

    char *cfc_dir;
    char *cfc_exe;
    char *cfc_command;

    int i;

    cfc_dir = chaz_Util_join(dir_sep, self->base_dir, "..", "compiler", "c",
                             NULL);
    cfc_exe = chaz_Util_join("", cfc_dir, dir_sep, "cfc", exe_ext, NULL);

    rule = chaz_MakeFile_add_rule(self->makefile, cfc_exe, NULL);
    chaz_MakeRule_add_make_command(rule, cfc_dir, NULL);

    self->cfh_var = chaz_MakeFile_add_var(self->makefile, "CLOWNFISH_HEADERS",
                                          NULL);
    chaz_Make_list_files(self->core_dir, "cfh", S_cfh_file_callback, self);
    chaz_Make_list_files(self->test_dir, "cfh", S_cfh_file_callback, self);

    rule = chaz_MakeFile_add_rule(self->makefile, self->autogen_target,
                                  cfc_exe);
    chaz_MakeRule_add_prereq(rule, "$(CLOWNFISH_HEADERS)");
    cfc_command = chaz_Util_join("", cfc_exe, " --source=", self->core_dir,
                                 " --source=", self->test_dir,
                                 " --dest=autogen --header=cfc_header", NULL);
    chaz_MakeRule_add_command(rule, cfc_command);

    /* Tell make how autogenerated source files are built. */
    for (i = 0; autogen_src_files[i] != NULL; ++i) {
        char *path = chaz_Util_join(dir_sep, self->autogen_src_dir,
                                    autogen_src_files[i], NULL);
        chaz_MakeFile_add_rule(self->makefile, path, self->autogen_target);
        free(path);
    }

    rule = chaz_MakeFile_clean_rule(self->makefile);
    chaz_MakeRule_add_recursive_rm_command(rule, "autogen");
    chaz_MakeRule_add_make_command(rule, cfc_dir, "clean");

    rule = chaz_MakeFile_distclean_rule(self->makefile);
    chaz_MakeRule_add_make_command(rule, cfc_dir, "distclean");

    free(cfc_dir);
    free(cfc_exe);
    free(cfc_command);
}

static void
cfish_MakeFile_write_c_test_rules(cfish_MakeFile *self) {
    chaz_MakeBinary *exe;
    chaz_CFlags     *link_flags;
    chaz_MakeRule   *rule;

    exe = chaz_MakeFile_add_exe(self->makefile, "t", "test_cfish");
    chaz_MakeBinary_add_src_file(exe, "t", "test_cfish.c");

    link_flags = chaz_MakeBinary_get_link_flags(exe);
    chaz_CFlags_add_rpath(link_flags, "\"$$PWD\"");
    chaz_CFlags_add_shared_lib(link_flags, NULL, "testcfish",
                               cfish_major_version);
    chaz_CFlags_add_shared_lib(link_flags, NULL, "clownfish",
                               cfish_major_version);

    chaz_MakeBinary_add_prereq(exe, "$(TESTCFISH_SHARED_LIB)");
    chaz_MakeBinary_add_prereq(exe, "$(CLOWNFISH_SHARED_LIB)");

    chaz_MakeFile_add_rule(self->makefile, "$(TEST_CFISH_EXE_OBJS)",
                           self->autogen_target);

    rule = chaz_MakeFile_add_rule(self->makefile, "test", "$(TEST_CFISH_EXE)");
    chaz_MakeRule_add_command(rule, "$(TEST_CFISH_EXE)");

    if (chaz_OS_shell_type() == CHAZ_OS_POSIX) {
        const char *valgrind_command;

        rule = chaz_MakeFile_add_rule(self->makefile, "valgrind",
                                      "$(TEST_CFISH_EXE)");
        if (chaz_CC_binary_format() == CHAZ_CC_BINFMT_ELF) {
            valgrind_command = "LD_LIBRARY_PATH=. CLOWNFISH_VALGRIND=1"
                               " valgrind"
                               " --leak-check=full"
                               " $(TEST_CFISH_EXE)";
        }
        else {
            valgrind_command = "CLOWNFISH_VALGRIND=1"
                               " valgrind"
                               " --leak-check=full"
                               " $(TEST_CFISH_EXE)";
        }
        chaz_MakeRule_add_command(rule, valgrind_command);
    }

    if (chaz_CLI_defined(self->cli, "enable-coverage")) {
        rule = chaz_MakeFile_add_rule(self->makefile, "coverage",
                                      "$(TEST_CFISH_EXE)");
        chaz_MakeRule_add_command(rule,
                                  "lcov"
                                  " --zerocounters"
                                  " --directory $(BASE_DIR)");
        chaz_MakeRule_add_command(rule, "$(TEST_CFISH_EXE)");
        chaz_MakeRule_add_command(rule,
                                  "lcov"
                                  " --capture"
                                  " --directory $(BASE_DIR)"
                                  " --base-directory ."
                                  " --rc lcov_branch_coverage=1"
                                  " --output-file clownfish.info");
        chaz_MakeRule_add_command(rule,
                                  "lcov"
                                  " --remove clownfish.info"
                                  " '/usr/include/*'"
                                  " 'c/autogen/*'"
                                  " 'core/Clownfish/Test.*'"
                                  " 'core/Clownfish/Test/*'"
                                  " 'core/TestClownfish.*'"
                                  " --rc lcov_branch_coverage=1"
                                  " --output-file clownfish.info");
        chaz_MakeRule_add_command(rule,
                                  "genhtml"
                                  " --branch-coverage"
                                  " --output-directory coverage"
                                  " clownfish.info");

        rule = chaz_MakeFile_clean_rule(self->makefile);
        chaz_MakeRule_add_rm_command(rule, "clownfish.info");
        chaz_MakeRule_add_recursive_rm_command(rule, "coverage");
    }
}

static void
S_cfh_file_callback(const char *dir, char *file, void *context) {
    cfish_MakeFile *self = (cfish_MakeFile*)context;
    const char *dir_sep = chaz_OS_dir_sep();
    char *cfh_file;

    if (!S_ends_with(file, ".cfh")) {
        chaz_Util_warn("Unexpected Clownfish header filename: %s", file);
        return;
    }

    cfh_file = chaz_Util_join(dir_sep, dir, file, NULL);
    chaz_MakeVar_append(self->cfh_var, cfh_file);
    free(cfh_file);
}

static int
S_ends_with(const char *string, const char *postfix) {
    size_t len         = strlen(string);
    size_t postfix_len = strlen(postfix);
    return len >= postfix_len
           && memcmp(string + len - postfix_len, postfix, postfix_len) == 0;
}

static int
S_need_libpthread(chaz_CLI *cli) {
    static const char source[] =
        "#include <pthread.h>\n"
        "\n"
        "int main() {\n"
        "    pthread_create(0, 0, 0, 0);\n"
        "    pthread_key_create(0, 0);\n"
        "    return 0;\n"
        "}\n";
    chaz_CFlags *temp_cflags;

    if (chaz_CLI_defined(cli, "disable-threads")
        || chaz_HeadCheck_check_header("windows.h")
    ) {
        return 0;
    }

    if (!chaz_HeadCheck_check_header("pthread.h")) {
        chaz_Util_die("pthread.h not found. Try --disable-threads.");
    }

    if (chaz_CC_test_link(source)) {
        return 0;
    }

    temp_cflags = chaz_CC_get_temp_cflags();
    chaz_CFlags_add_external_lib(temp_cflags, "pthread");
    if (!chaz_CC_test_link(source)) {
        chaz_Util_die("Can't link with libpthread. Try --disable-threads.");
    }
    chaz_CFlags_clear(temp_cflags);

    return 1;
}