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From: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
To: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH 00/43] Unhide symbols
Date: Thu, 16 Apr 2020 01:15:45 +0200	[thread overview]
Message-ID: <71863e35-1d40-bb2e-f792-ded289f0f807@tarantool.org> (raw)
In-Reply-To: <cover.1586650013.git.v.shpilevoy@tarantool.org>

With help of Timur there was a discovered a little less
intrusive solution: a little hack with the compiler.

Consider this diff:

====================
diff --git a/src/exports.c b/src/exports.c
index de1892026..47fe1b9bd 100644
--- a/src/exports.c
+++ b/src/exports.c
@@ -30,6 +30,11 @@
  */
 #define EXPORT(func) extern void ** func(void)
 
+#include <time.h>
+
+extern void *bit_unused_function;
+extern void *bit_symbol;
+
 /**
  * The file is a hack to force the linker keep the needed symbols
  * in the result tarantool executable file.
@@ -121,6 +126,11 @@ export_syms(void)
 	const int func_count = sizeof(syms) / sizeof(syms[0]);
 	for (int i = 0; i < func_count; ++i)
 		((void **(*)(void))syms[i])();
+	if (time(NULL) == 0)
+	{
+		((void **(*)(void))bit_unused_function)();
+		((void **(*)(void))bit_symbol)();
+	}
 }
 
 #undef EXPORT
diff --git a/src/lib/bit/bit.c b/src/lib/bit/bit.c
index 72cc94dc3..94fe75408 100644
--- a/src/lib/bit/bit.c
+++ b/src/lib/bit/bit.c
@@ -31,6 +31,15 @@
 
 #include "bit/bit.h"
 
+void
+bit_unused_function(void)
+{
+	printf("Unused\n");
+	return;
+}
+
+int bit_symbol = 0;
+
 extern inline uint8_t
 load_u8(const void *p);
 
====================

As you can see, I managed to reference the needed symbols from a
static library without doing any includes. It means, we can
resurrect ffi_syms.c like it was before, but in a much simpler
manner, with 0 dependencies. Only extern void * of needed
variables and functions.

      parent reply	other threads:[~2020-04-15 23:15 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-12  0:12 Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 01/43] cmake: remove double usage of some source files Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 10/43] build: export src/lib/core/fiber.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 11/43] build: export src/lua/init.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 12/43] build: export src/lib/core/port.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 13/43] build: export src/lib/csv/csv.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 14/43] build: export src/title.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 15/43] build: export src/lua/tnt_iconv.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 16/43] build: export src/lib/core/exception.cc symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 17/43] build: export src/lib/uuid/tt_uuid.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 18/43] build: export src/lib/core/say.c symbols Vladislav Shpilevoy
2020-04-12  0:12 ` [Tarantool-patches] [PATCH 19/43] build: export src/lib/uri/uri.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 02/43] cmake: remove dynamic-list linker option Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 20/43] build: export third_party/PMurHash.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 21/43] build: export src/crc32.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 22/43] build: export src/lua/msgpack.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 23/43] build: export src/main.cc symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 24/43] build: export src/box/space.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 25/43] build: export src/box/schema.cc symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 26/43] build: export src/lib/crypto/crypto.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 27/43] build: export src/lua/buffer.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 28/43] build: export src/lib/swim/swim.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 29/43] build: export src/lib/core/fiber_cond.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 03/43] build: export src/lib/core/clock.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 30/43] build: export src/lib/core/coio.cc symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 31/43] build: export src/lua/utils.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 32/43] build: export src/box/lua/tuple.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 33/43] build: export src/lua/error.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 34/43] build: export src/box/txn.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 35/43] build: export src/box/key_def.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 36/43] build: export src/box/tuple.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 37/43] build: export src/box/index.cc symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 38/43] build: export src/box/box.cc symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 39/43] build: export src/box/error.cc symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 04/43] build: export src/scramble.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 40/43] build: export src/lib/core/diag.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 41/43] build: export src/lib/core/latch.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 42/43] build: export src/lua/string.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 43/43] build: export public Lua symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 05/43] build: export src/lua/socket.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 06/43] build: export third_party/base64.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 07/43] build: export src/lua/digest.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 08/43] build: export src/lib/salad/guava.c symbols Vladislav Shpilevoy
2020-04-12  0:13 ` [Tarantool-patches] [PATCH 09/43] build: export src/lib/core/random.c symbols Vladislav Shpilevoy
2020-04-14 18:14   ` Timur Safin
2020-04-12 11:34 ` [Tarantool-patches] [PATCH 00/43] Unhide symbols Konstantin Osipov
2020-04-12 14:05   ` Vladislav Shpilevoy
2020-04-13  9:40     ` Konstantin Osipov
2020-04-13  9:42       ` Konstantin Osipov
2020-04-13 13:53         ` Vladislav Shpilevoy
2020-04-13 14:15           ` Konstantin Osipov
2020-04-13 14:21             ` Vladislav Shpilevoy
2020-04-13 19:49           ` Sergey Ostanevich
2020-04-13 21:01             ` Vladislav Shpilevoy
2020-04-13 21:38               ` Konstantin Osipov
2020-04-14 18:01                 ` Timur Safin
2020-04-14 18:26                   ` Timur Safin
2020-04-14 20:41                   ` 'Konstantin Osipov'
2020-04-15 10:28                     ` Mons Anderson
2020-04-15 10:40                     ` Mons Anderson
2020-04-15 10:50                       ` sergos
2020-04-15 21:58                         ` Vladislav Shpilevoy
2020-04-16 12:13                           ` Cyrill Gorcunov
2020-04-16 20:30                             ` Vladislav Shpilevoy
2020-04-17  7:48                               ` Timur Safin
2020-04-17  8:29                               ` Cyrill Gorcunov
2020-04-15 11:27                       ` Konstantin Osipov
2020-04-12 14:25 ` Vladislav Shpilevoy
2020-04-12 20:18 ` Vladislav Shpilevoy
2020-04-13 14:26 ` Vladislav Shpilevoy
2020-04-13 16:44   ` Cyrill Gorcunov
2020-04-13 17:57     ` Vladislav Shpilevoy
2020-04-13 18:17       ` Cyrill Gorcunov
2020-04-14  1:15 ` Vladislav Shpilevoy
2020-04-14  1:27 ` [Tarantool-patches] [PATCH 44/43] build: export src/box/lua/console.c symbols Vladislav Shpilevoy
2020-04-15 23:15 ` Vladislav Shpilevoy [this message]

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