configure: Default to 'cc', not 'gcc'

Default to 'cc' as our compiler, rather than 'gcc'. We used to have
to insist on gcc when we still kept the CPU env in a fixed global
register, but this is no longer necessary and we will now compile OK
on clang as well as gcc.  Using 'cc' should generally result in us
using the most standard and maintained system compiler for the
platform.  (For instance on newer MacOS X 'gcc' exists but is an
elderly compiler provided mostly for legacy reasons, and 'cc'
(which is clang) is definitely the better choice.) On Linux there
will generally be no user-visible change since cc will be gcc.

This changeover necessitates a slight reworking of how we set the
'cc' variable, because GNU cross toolchains generally provide a
'${cross_prefix}gcc' but not a '${cross_prefix}cc'.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
1 file changed
tree: 7d7bea7b004ff3e7b93632fa1308d2ea56407ef2
  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