build: replace weak symbols with a static library

Weak symbols were a nice idea, but they turned out not to be a good one.
Toolchain support is just too sparse, in particular llvm-gcc is totally
broken.

This patch uses a surprisingly low-tech approach: a static library.
Symbols in a static library are always overridden by symbols in an
object file.  Furthermore, if you place each function in a separate
source file, object files for unused functions will not be taken in.
This means that each function can use all the dependencies that it needs
(especially QAPI stuff such as error_setg).

Thus, all stubs are placed in separate object files and put together in
a static library.  The library then is linked to all programs.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
18 files changed
tree: ec92ca7ecc6b9da1c5c8f18e52e6498e42908f50
  1. audio/
  2. backends/
  3. block/
  4. bsd-user/
  5. default-configs/
  6. docs/
  7. fpu/
  8. fsdev/
  9. gdb-xml/
  10. hw/
  11. include/
  12. libcacard/
  13. linux-headers/
  14. linux-user/
  15. net/
  16. pc-bios/
  17. qapi/
  18. qga/
  19. QMP/
  20. qom/
  21. roms/
  22. scripts/
  23. slirp/
  24. stubs/
  25. sysconfigs/
  26. target-alpha/
  27. target-arm/
  28. target-cris/
  29. target-i386/
  30. target-lm32/
  31. target-m68k/
  32. target-microblaze/
  33. target-mips/
  34. target-openrisc/
  35. target-ppc/
  36. target-s390x/
  37. target-sh4/
  38. target-sparc/
  39. target-unicore32/
  40. target-xtensa/
  41. tcg/
  42. tests/
  43. trace/
  44. ui/
  45. .exrc
  46. .gitignore
  47. .gitmodules
  48. .mailmap
  49. a.out.h
  50. acl.c
  51. acl.h
  52. aes.c
  53. aes.h
  54. aio-posix.c
  55. aio-win32.c
  56. alpha-dis.c
  57. alpha.ld
  58. arch_init.c
  59. arch_init.h
  60. arm-dis.c
  61. arm.ld
  62. async.c
  63. balloon.c
  64. balloon.h
  65. bitmap.c
  66. bitmap.h
  67. bitops.c
  68. bitops.h
  69. block-migration.c
  70. block-migration.h
  71. block.c
  72. block.h
  73. block_int.h
  74. blockdev-nbd.c
  75. blockdev.c
  76. blockdev.h
  77. blockjob.c
  78. blockjob.h
  79. bswap.h
  80. bt-host.c
  81. bt-host.h
  82. bt-vhci.c
  83. buffered_file.c
  84. buffered_file.h
  85. cache-utils.c
  86. cache-utils.h
  87. Changelog
  88. cmd.c
  89. cmd.h
  90. CODING_STYLE
  91. compatfd.c
  92. compatfd.h
  93. compiler.h
  94. config.h
  95. configure
  96. console.c
  97. console.h
  98. COPYING
  99. COPYING.LIB
  100. coroutine-gthread.c
  101. coroutine-sigaltstack.c
  102. coroutine-ucontext.c
  103. coroutine-win32.c
  104. cpu-all.h
  105. cpu-common.h
  106. cpu-defs.h
  107. cpu-exec.c
  108. cpus.c
  109. cpus.h
  110. cputlb.c
  111. cputlb.h
  112. cris-dis.c
  113. cursor.c
  114. cursor_hidden.xpm
  115. cursor_left_ptr.xpm
  116. cutils.c
  117. def-helper.h
  118. device_tree.c
  119. device_tree.h
  120. dis-asm.h
  121. disas.c
  122. disas.h
  123. dma-helpers.c
  124. dma.h
  125. dump-stub.c
  126. dump.c
  127. dump.h
  128. elf.h
  129. envlist.c
  130. envlist.h
  131. error.c
  132. error.h
  133. event_notifier-posix.c
  134. event_notifier-win32.c
  135. event_notifier.h
  136. exec-all.h
  137. exec-memory.h
  138. exec.c
  139. gdbstub.c
  140. gdbstub.h
  141. gen-icount.h
  142. HACKING
  143. hmp-commands.hx
  144. hmp.c
  145. hmp.h
  146. host-utils.c
  147. host-utils.h
  148. hppa-dis.c
  149. hppa.ld
  150. hwaddr.h
  151. i386-dis.c
  152. i386.ld
  153. ia64-dis.c
  154. ia64.ld
  155. input.c
  156. int128.h
  157. iohandler.c
  158. ioport.c
  159. ioport.h
  160. iorange.h
  161. iov.c
  162. iov.h
  163. json-lexer.c
  164. json-lexer.h
  165. json-parser.c
  166. json-parser.h
  167. json-streamer.c
  168. json-streamer.h
  169. kvm-all.c
  170. kvm-stub.c
  171. kvm.h
  172. libfdt_env.h
  173. LICENSE
  174. lm32-dis.c
  175. m68k-dis.c
  176. m68k.ld
  177. main-loop.c
  178. main-loop.h
  179. MAINTAINERS
  180. Makefile
  181. Makefile.dis
  182. Makefile.objs
  183. Makefile.target
  184. Makefile.user
  185. memory-internal.h
  186. memory.c
  187. memory.h
  188. memory_mapping-stub.c
  189. memory_mapping.c
  190. memory_mapping.h
  191. microblaze-dis.c
  192. migration-exec.c
  193. migration-fd.c
  194. migration-tcp.c
  195. migration-unix.c
  196. migration.c
  197. migration.h
  198. mips-dis.c
  199. mips.ld
  200. module.c
  201. module.h
  202. monitor.c
  203. monitor.h
  204. nbd.c
  205. nbd.h
  206. net.c
  207. net.h
  208. notify.c
  209. notify.h
  210. os-posix.c
  211. os-win32.c
  212. osdep.c
  213. osdep.h
  214. oslib-posix.c
  215. oslib-win32.c
  216. page_cache.c
  217. path.c
  218. pci-ids.txt
  219. poison.h
  220. ppc-dis.c
  221. ppc.ld
  222. ppc64.ld
  223. qapi-schema-guest.json
  224. qapi-schema-test.json
  225. qapi-schema.json
  226. qbool.c
  227. qbool.h
  228. qdict-test-data.txt
  229. qdict.c
  230. qdict.h
  231. qemu-aio.h
  232. qemu-barrier.h
  233. qemu-bridge-helper.c
  234. qemu-char.c
  235. qemu-char.h
  236. qemu-common.h
  237. qemu-config.c
  238. qemu-config.h
  239. qemu-coroutine-int.h
  240. qemu-coroutine-io.c
  241. qemu-coroutine-lock.c
  242. qemu-coroutine-sleep.c
  243. qemu-coroutine.c
  244. qemu-coroutine.h
  245. qemu-doc.texi
  246. qemu-error.c
  247. qemu-error.h
  248. qemu-file.h
  249. qemu-ga.c
  250. qemu-img-cmds.hx
  251. qemu-img.c
  252. qemu-img.texi
  253. qemu-io.c
  254. qemu-lock.h
  255. qemu-log.c
  256. qemu-log.h
  257. qemu-nbd.c
  258. qemu-nbd.texi
  259. qemu-objects.h
  260. qemu-option-internal.h
  261. qemu-option.c
  262. qemu-option.h
  263. qemu-options-wrapper.h
  264. qemu-options.h
  265. qemu-options.hx
  266. qemu-os-posix.h
  267. qemu-os-win32.h
  268. qemu-pixman.c
  269. qemu-pixman.h
  270. qemu-progress.c
  271. qemu-queue.h
  272. qemu-seccomp.c
  273. qemu-seccomp.h
  274. qemu-sockets.c
  275. qemu-tech.texi
  276. qemu-thread-posix.c
  277. qemu-thread-posix.h
  278. qemu-thread-win32.c
  279. qemu-thread-win32.h
  280. qemu-thread.h
  281. qemu-timer-common.c
  282. qemu-timer.c
  283. qemu-timer.h
  284. qemu-tls.h
  285. qemu-tool.c
  286. qemu-user.c
  287. qemu-x509.h
  288. qemu-xattr.h
  289. qemu.sasl
  290. qemu_socket.h
  291. qerror.c
  292. qerror.h
  293. qfloat.c
  294. qfloat.h
  295. qint.c
  296. qint.h
  297. qjson.c
  298. qjson.h
  299. qlist.c
  300. qlist.h
  301. qmp-commands.hx
  302. qmp.c
  303. qobject.h
  304. qstring.c
  305. qstring.h
  306. qtest.c
  307. qtest.h
  308. range.h
  309. readline.c
  310. readline.h
  311. README
  312. rules.mak
  313. s390-dis.c
  314. s390.ld
  315. savevm.c
  316. sh4-dis.c
  317. softmmu-semi.h
  318. softmmu_defs.h
  319. softmmu_exec.h
  320. softmmu_header.h
  321. softmmu_template.h
  322. sparc-dis.c
  323. sparc.ld
  324. sparc64.ld
  325. spice-qemu-char.c
  326. sysemu.h
  327. tcg-runtime.c
  328. tci-dis.c
  329. tci.c
  330. thread-pool.c
  331. thread-pool.h
  332. thunk.c
  333. thunk.h
  334. TODO
  335. trace-events
  336. translate-all.c
  337. uboot_image.h
  338. uri.c
  339. uri.h
  340. user-exec.c
  341. VERSION
  342. version.rc
  343. vgafont.h
  344. vl.c
  345. vmstate.h
  346. x86_64.ld
  347. xen-all.c
  348. xen-mapcache.c
  349. xen-mapcache.h
  350. xen-stub.c