eliminate -Wweak-vtables warnings

build.cc

@@ -28,6 +28,9 @@ namespace fs = ostd::filesystem;
 #include "src/io.cc"
 #include "src/process.cc"
 #include "src/filesystem.cc"
+#include "src/channel.cc"
+#include "src/string.cc"
+#include "src/argparse.cc"
 
 #define OSTD_GEN_UNICODE_INCLUDE
 #include "gen_unicode.cc"
@@ -60,15 +63,15 @@ static fs::path OSTD_SHARED_LIB = "libostd.so";
 static fs::path OSTD_STATIC_LIB = "libostd.a";
 
 static std::string DEFAULT_CXXFLAGS = "-std=c++1z -I. -O2 -Wall -Wextra "
-                                      "-Wshadow -Wold-style-cast";
+                                      "-Wshadow -Wold-style-cast -fPIC";
 static std::string DEFAULT_LDFLAGS  = "-pthread";
-static std::string DEFAULT_ASFLAGS  = "";
+static std::string DEFAULT_ASFLAGS  = "-fPIC";
 
 static std::string DEBUG_CXXFLAGS = "-g";
 
-static std::string SHARED_CXXFLAGS = "-fPIC";
+static std::string SHARED_CXXFLAGS = "";
 static std::string SHARED_LDFLAGS  = "-shared";
-static std::string SHARED_ASFLAGS  = "-fPIC";
+static std::string SHARED_ASFLAGS  = "";
 
 /* DO NOT CHANGE PAST THIS POINT */
 

ostd/argparse.hh

@@ -44,6 +44,9 @@ namespace ostd {
 struct arg_error: std::runtime_error {
     using std::runtime_error::runtime_error;
 
+    /* empty, for vtable placement */
+    virtual ~arg_error();
+
     template<typename ...A>
     arg_error(string_range fmt, A const &...args):
         arg_error(format(appender<std::string>(), fmt, args...).get())
@@ -101,7 +104,7 @@ struct arg_description {
     friend struct arg_group;
 
     /** @brief The base class contains no data. */
-    virtual ~arg_description() {}
+    virtual ~arg_description();
 
     /** @brief Gets an ostd::arg_type for the class. */
     virtual arg_type type() const noexcept = 0;
@@ -136,6 +139,9 @@ protected:
  * It's not instantiated directly.
  */
 struct arg_argument: arg_description {
+    /* empty, for vtable placement */
+    virtual ~arg_argument();
+
     /** @brief Sets the help for the argument.
      *
      * The help string is stored internally. Returns itself.
@@ -226,6 +232,9 @@ struct arg_optional: arg_argument {
     friend struct arg_group;
     friend struct arg_mutually_exclusive_group;
 
+    /* empty, for vtable placement */
+    virtual ~arg_optional();
+
     /** @brief Gets the argument class type (ostd::arg_type).
      *
      * The value is always `OPTIONAL`.
@@ -519,6 +528,9 @@ struct arg_positional: arg_argument {
     friend struct basic_arg_parser;
     friend struct arg_description_container;
 
+    /* empty, for vtable placement */
+    virtual ~arg_positional();
+
     /** @brief Gets the argument class type (ostd::arg_type).
      *
      * The value is always `POSITIONAL`.
@@ -662,6 +674,9 @@ private:
 struct arg_mutually_exclusive_group: arg_description {
     friend struct arg_description_container;
 
+    /* empty, for vtable placement */
+    virtual ~arg_mutually_exclusive_group();
+
     /** @brief Gets the argument class type (ostd::arg_type).
      *
      * The value is always `MUTUALLY_EXCLUSIVE_GROUP`.
@@ -866,6 +881,9 @@ struct arg_group: arg_description, arg_description_container {
     template<typename HelpFormatter>
     friend struct basic_arg_parser;
 
+    /* empty, for vtable placement */
+    virtual ~arg_group();
+
     /** @brief Gets the argument class type (ostd::arg_type).
      *
      * The value is always `GROUP`.

ostd/channel.hh

@@ -35,6 +35,8 @@ namespace ostd {
 /** @brief Thrown when manipulating a channel that has been closed. */
 struct channel_error: std::logic_error {
     using std::logic_error::logic_error;
+    /* empty, for vtable placement */
+    virtual ~channel_error();
 };
 
 /** @brief A thread-safe message queue.

ostd/concurrency.hh

@@ -236,7 +236,7 @@ protected:
 
 public:
     /** @brief Does nothing, this base class is empty. */
-    virtual ~scheduler() {}
+    virtual ~scheduler();
 
     scheduler(scheduler const &) = delete;
     scheduler(scheduler &&) = delete;
@@ -553,6 +553,9 @@ namespace detail {
         csched_task &operator=(csched_task const &) = delete;
         csched_task &operator=(csched_task &&) = delete;
 
+        /* empty, for vtable placement */
+        virtual ~csched_task();
+
         template<typename F, typename SA>
         csched_task(F &&f, SA &&sa): p_func(std::forward<F>(f)) {
             if (!p_func) {

ostd/coroutine.hh

@@ -56,6 +56,8 @@ namespace ostd {
  */
 struct coroutine_error: std::runtime_error {
     using std::runtime_error::runtime_error;
+    /* empty, for vtable placement */
+    virtual ~coroutine_error();
 };
 
 /** @brief An encapsulated context any coroutine-type inherits from.
@@ -91,10 +93,7 @@ protected:
      * stack is freed (if present) using the same stack allocator it was
      * allocated with.
      */
-    virtual ~coroutine_context() {
-        unwind();
-        free_stack();
-    }
+    virtual ~coroutine_context();
 
     coroutine_context(coroutine_context const &) = delete;
 

ostd/format.hh

@@ -57,6 +57,8 @@ enum format_flags {
 /** @brief Thrown when format string does not properly match the arguments. */
 struct format_error: std::runtime_error {
     using std::runtime_error::runtime_error;
+    /* empty, for vtable placement */
+    virtual ~format_error();
 };
 
 struct format_spec;

ostd/generic_condvar.hh

@@ -25,7 +25,7 @@ namespace ostd {
 namespace detail {
     struct cond_iface {
         cond_iface() {}
-        virtual ~cond_iface() {}
+        virtual ~cond_iface();
         virtual void notify_one() = 0;
         virtual void notify_all() = 0;
         virtual void wait(std::unique_lock<std::mutex> &) = 0;

ostd/process.hh

@@ -34,6 +34,8 @@ namespace ostd {
 /** @brief Thrown on errors in ostd::split_args(). */
 struct word_error: std::runtime_error {
     using std::runtime_error::runtime_error;
+    /* empty, for vtable placement */
+    virtual ~word_error();
 };
 
 namespace detail {
@@ -81,6 +83,8 @@ Sink &&split_args(Sink &&out, string_range str) {
 /** @brief Thrown on errors in ostd::subprocess. */
 struct subprocess_error: std::runtime_error {
     using std::runtime_error::runtime_error;
+    /* empty, for vtable placement */
+    virtual ~subprocess_error();
 };
 
 /** @brief The mode used for standard streams in ostd::subprocess.

ostd/stream.hh

@@ -90,6 +90,8 @@ struct stream_range;
 /** @brief Thrown on stream errors. */
 struct stream_error: std::system_error {
     using std::system_error::system_error;
+    /* empty, for vtable placement */
+    virtual ~stream_error();
 };
 
 template<typename T = char, typename TC = std::basic_string<T>>
@@ -105,7 +107,7 @@ struct stream {
     using offset_type = stream_off_t;
 
     /** @brief Does nothing by default. */
-    virtual ~stream() {}
+    virtual ~stream();
 
     /** @brief Closes the stream.
      *

ostd/string.hh

@@ -747,6 +747,8 @@ namespace utf {
     /** @brief Thrown on UTF-8 decoding failure. */
     struct utf_error: std::runtime_error {
         using std::runtime_error::runtime_error;
+        /* empty, for vtable placement */
+        virtual ~utf_error();
     };
 
     /* @brief Get the Unicode code point for a UTF-8 sequence.

src/argparse.cc

@@ -0,0 +1,22 @@
+/* Argparse implementation details.
+ *
+ * This file is part of libostd. See COPYING.md for futher information.
+ */
+
+#include "ostd/argparse.hh"
+
+namespace ostd {
+
+/* place the vtables in here */
+
+arg_error::~arg_error() {}
+
+arg_description::~arg_description() {}
+arg_argument::~arg_argument() {}
+arg_optional::~arg_optional() {}
+arg_positional::~arg_positional() {}
+
+arg_mutually_exclusive_group::~arg_mutually_exclusive_group() {}
+arg_group::~arg_group() {}
+
+} /* namespace ostd */

src/channel.cc

@@ -0,0 +1,19 @@
+/* Channel implementation bits.
+ *
+ * This file is part of libostd. See COPYING.md for futher information.
+ */
+
+#include "ostd/generic_condvar.hh"
+#include "ostd/channel.hh"
+
+namespace ostd {
+
+/* place the vtable in here */
+channel_error::~channel_error() {}
+
+namespace detail {
+    /* vtable placement for generic_condvar */
+    cond_iface::~cond_iface() {}
+} /* namespace detail */
+
+} /* namespace ostd */

src/concurrency.cc

@@ -6,10 +6,24 @@
 #include "ostd/concurrency.hh"
 
 namespace ostd {
+
+/* place the vtable in here */
+coroutine_error::~coroutine_error() {}
+
+/* non-inline for vtable placement */
+coroutine_context::~coroutine_context() {
+    unwind();
+    free_stack();
+}
+
 namespace detail {
+    /* place the vtable here, derived from coroutine_context */
+    csched_task::~csched_task() {}
 
-OSTD_EXPORT scheduler *current_scheduler = nullptr;
-OSTD_EXPORT thread_local csched_task *current_csched_task = nullptr;
-
+    OSTD_EXPORT scheduler *current_scheduler = nullptr;
+    OSTD_EXPORT thread_local csched_task *current_csched_task = nullptr;
 } /* namespace detail */
+
+scheduler::~scheduler() {}
+
 } /* namespace ostd */

src/io.cc

@@ -8,10 +8,15 @@
 #include <cstdlib>
 #include <cerrno>
 
+#include "ostd/stream.hh"
 #include "ostd/io.hh"
 
 namespace ostd {
 
+/* place the vtable in here */
+stream_error::~stream_error() {}
+stream::~stream() {}
+
 static char const *filemodes[] = {
     "rb", "wb", "ab", "rb+", "wb+", "ab+"
 };

src/process.cc

@@ -12,3 +12,11 @@
 #else
 #  error "Unsupported platform"
 #endif
+
+namespace ostd {
+
+/* place the vtable in here */
+word_error::~word_error() {}
+subprocess_error::~subprocess_error() {}
+
+} /* namespace ostd */

src/string.cc

@@ -6,10 +6,14 @@
 #include <cstdint>
 #include <cstdlib>
 #include "ostd/string.hh"
+#include "ostd/format.hh"
 
 namespace ostd {
 namespace utf {
 
+/* place the vtable in here */
+utf_error::~utf_error() {}
+
 constexpr char32_t MaxCodepoint = 0x10FFFF;
 
 namespace detail {
@@ -461,4 +465,8 @@ int case_compare(u32string_range s1, u32string_range s2) noexcept {
 }
 
 } /* namespace utf */
+
+/* place the vtable in here */
+format_error::~format_error() {}
+
 } /* namespace ostd */