configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4 ## Definitions of private macros.
   5
   6 # GIT_CONF_SUBST(VAL, VAR)
   7 # ------------------------
   8 # Cause the line "VAR=VAL" to be eventually appended to ${config_file}.
   9 AC_DEFUN([GIT_CONF_SUBST],
  10 [AC_REQUIRE([GIT_CONF_SUBST_INIT])
  11 config_appended_defs="$config_appended_defs${newline}dnl
  12 $1=m4_if([$#],[1],[${$1}],[$2])"])
  13
  14 # GIT_CONF_SUBST_INIT
  15 # -------------------
  16 # Prepare shell variables and autoconf machine required by later calls
  17 # to GIT_CONF_SUBST.
  18 AC_DEFUN([GIT_CONF_SUBST_INIT],
  19     [config_appended_defs=; newline='
  20 '
  21     AC_CONFIG_COMMANDS([$config_file],
  22                        [echo "$config_appended_defs" >> "$config_file"],
  23                        [config_file=$config_file
  24                         config_appended_defs="$config_appended_defs"])])
  25
  26 # GIT_ARG_SET_PATH(PROGRAM)
  27 # -------------------------
  28 # Provide --with-PROGRAM=PATH option to set PATH to PROGRAM
  29 # Optional second argument allows setting NO_PROGRAM=YesPlease if
  30 # --without-PROGRAM version used.
  31 AC_DEFUN([GIT_ARG_SET_PATH],
  32     [AC_ARG_WITH([$1],
  33         [AS_HELP_STRING([--with-$1=PATH],
  34                         [provide PATH to $1])],
  35         [GIT_CONF_APPEND_PATH([$1], [$2])],
  36         [])])
  37
  38 # GIT_CONF_APPEND_PATH(PROGRAM)
  39 # -----------------------------
  40 # Parse --with-PROGRAM=PATH option to set PROGRAM_PATH=PATH
  41 # Used by GIT_ARG_SET_PATH(PROGRAM)
  42 # Optional second argument allows setting NO_PROGRAM=YesPlease if
  43 # --without-PROGRAM is used.
  44 AC_DEFUN([GIT_CONF_APPEND_PATH],
  45     [m4_pushdef([GIT_UC_PROGRAM], m4_toupper([$1]))dnl
  46     if test "$withval" = "no"; then
  47         if test -n "$2"; then
  48                 GIT_UC_PROGRAM[]_PATH=$withval
  49                 AC_MSG_NOTICE([Disabling use of GIT_UC_PROGRAM])
  50                 GIT_CONF_SUBST([NO_]GIT_UC_PROGRAM, [YesPlease])
  51                 GIT_CONF_SUBST(GIT_UC_PROGRAM[]_PATH, [])
  52         else
  53                 AC_MSG_ERROR([You cannot use git without $1])
  54         fi
  55     else
  56         if test "$withval" = "yes"; then
  57                 AC_MSG_WARN([You should provide path for --with-$1=PATH])
  58         else
  59                 GIT_UC_PROGRAM[]_PATH=$withval
  60                 AC_MSG_NOTICE([Setting GIT_UC_PROGRAM[]_PATH to $withval])
  61                 GIT_CONF_SUBST(GIT_UC_PROGRAM[]_PATH, [$withval])
  62         fi
  63     fi
  64     m4_popdef([GIT_UC_PROGRAM])])
  65
  66 # GIT_PARSE_WITH(PACKAGE)
  67 # -----------------------
  68 # For use in AC_ARG_WITH action-if-found, for packages default ON.
  69 # * Set NO_PACKAGE=YesPlease for --without-PACKAGE
  70 # * Set PACKAGEDIR=PATH for --with-PACKAGE=PATH
  71 # * Unset NO_PACKAGE for --with-PACKAGE without ARG
  72 AC_DEFUN([GIT_PARSE_WITH],
  73     [m4_pushdef([GIT_UC_PACKAGE], m4_toupper([$1]))dnl
  74     if test "$withval" = "no"; then
  75         NO_[]GIT_UC_PACKAGE=YesPlease
  76     elif test "$withval" = "yes"; then
  77         NO_[]GIT_UC_PACKAGE=
  78     else
  79         NO_[]GIT_UC_PACKAGE=
  80         GIT_UC_PACKAGE[]DIR=$withval
  81         AC_MSG_NOTICE([Setting GIT_UC_PACKAGE[]DIR to $withval])
  82         GIT_CONF_SUBST(GIT_UC_PACKAGE[DIR], [$withval])
  83     fi
  84     m4_popdef([GIT_UC_PACKAGE])])
  85
  86 # GIT_PARSE_WITH_SET_MAKE_VAR(WITHNAME, VAR, HELP_TEXT)
  87 # -----------------------------------------------------
  88 # Set VAR to the value specied by --with-WITHNAME.
  89 # No verification of arguments is performed, but warnings are issued
  90 # if either 'yes' or 'no' is specified.
  91 # HELP_TEXT is presented when --help is called.
  92 # This is a direct way to allow setting variables in the Makefile.
  93 AC_DEFUN([GIT_PARSE_WITH_SET_MAKE_VAR],
  94 [AC_ARG_WITH([$1],
  95  [AS_HELP_STRING([--with-$1=VALUE], $3)],
  96  if test -n "$withval"; then
  97   if test "$withval" = "yes" -o "$withval" = "no"; then
  98     AC_MSG_WARN([You likely do not want either 'yes' or 'no' as]
  99                      [a value for $1 ($2).  Maybe you do...?])
 100   fi
 101   AC_MSG_NOTICE([Setting $2 to $withval])
 102   GIT_CONF_SUBST([$2], [$withval])
 103  fi)])# GIT_PARSE_WITH_SET_MAKE_VAR
 104
 105 #
 106 # GIT_CHECK_FUNC(FUNCTION, IFTRUE, IFFALSE)
 107 # -----------------------------------------
 108 # Similar to AC_CHECK_FUNC, but on systems that do not generate
 109 # warnings for missing prototypes (e.g. FreeBSD when compiling without
 110 # -Wall), it does not work.  By looking for function definition in
 111 # libraries, this problem can be worked around.
 112 AC_DEFUN([GIT_CHECK_FUNC],[AC_CHECK_FUNC([$1],[
 113   AC_SEARCH_LIBS([$1],,
 114   [$2],[$3])
 115 ],[$3])])
 116
 117 #
 118 # GIT_STASH_FLAGS(BASEPATH_VAR)
 119 # -----------------------------
 120 # Allow for easy stashing of LDFLAGS and CPPFLAGS before running
 121 # tests that may want to take user settings into account.
 122 AC_DEFUN([GIT_STASH_FLAGS],[
 123 if test -n "$1"; then
 124    old_CPPFLAGS="$CPPFLAGS"
 125    old_LDFLAGS="$LDFLAGS"
 126    CPPFLAGS="-I$1/include $CPPFLAGS"
 127    LDFLAGS="-L$1/$lib $LDFLAGS"
 128 fi
 129 ])
 130
 131 dnl
 132 dnl GIT_UNSTASH_FLAGS(BASEPATH_VAR)
 133 dnl -----------------------------
 134 dnl Restore the stashed *FLAGS values.
 135 AC_DEFUN([GIT_UNSTASH_FLAGS],[
 136 if test -n "$1"; then
 137    CPPFLAGS="$old_CPPFLAGS"
 138    LDFLAGS="$old_LDFLAGS"
 139 fi
 140 ])
 141
 142 ## Configure body starts here.
 143
 144 AC_PREREQ(2.59)
 145 AC_INIT([git], [@@GIT_VERSION@@], [git@vger.kernel.org])
 146
 147 AC_CONFIG_SRCDIR([git.c])
 148
 149 config_file=config.mak.autogen
 150 config_in=config.mak.in
 151
 152 GIT_CONF_SUBST([AUTOCONFIGURED], [YesPlease])
 153
 154 # Directories holding "saner" versions of common or POSIX binaries.
 155 AC_ARG_WITH([sane-tool-path],
 156   [AS_HELP_STRING(
 157     [--with-sane-tool-path=DIR-1[[:DIR-2...:DIR-n]]],
 158     [Directories to prepend to PATH in build system and generated scripts])],
 159   [if test "$withval" = "no"; then
 160     withval=''
 161   else
 162     AC_MSG_NOTICE([Setting SANE_TOOL_PATH to '$withval'])
 163   fi
 164   GIT_CONF_SUBST([SANE_TOOL_PATH], [$withval])],
 165   [# If the "--with-sane-tool-path" option was not given, don't touch
 166    # SANE_TOOL_PATH here, but let defaults in Makefile take care of it.
 167    # This should minimize spurious differences in the behaviour of the
 168    # Git build system when configure is used w.r.t. when it is not.
 169    :])
 170
 171 ## Site configuration related to programs (before tests)
 172 ## --with-PACKAGE[=ARG] and --without-PACKAGE
 173 #
 174 # Set lib to alternative name of lib directory (e.g. lib64)
 175 AC_ARG_WITH([lib],
 176  [AS_HELP_STRING([--with-lib=ARG],
 177                  [ARG specifies alternative name for lib directory])],
 178  [if test "$withval" = "no" || test "$withval" = "yes"; then
 179         AC_MSG_WARN([You should provide name for --with-lib=ARG])
 180   else
 181         lib=$withval
 182         AC_MSG_NOTICE([Setting lib to '$lib'])
 183         GIT_CONF_SUBST([lib])
 184   fi])
 185
 186 if test -z "$lib"; then
 187    AC_MSG_NOTICE([Setting lib to 'lib' (the default)])
 188    lib=lib
 189 fi
 190
 191 AC_ARG_ENABLE([pthreads],
 192  [AS_HELP_STRING([--enable-pthreads=FLAGS],
 193   [FLAGS is the value to pass to the compiler to enable POSIX Threads.]
 194   [The default if FLAGS is not specified is to try first -pthread]
 195   [and then -lpthread.]
 196   [--disable-pthreads will disable threading.])],
 197 [
 198 if test "x$enableval" = "xyes"; then
 199    AC_MSG_NOTICE([Will try -pthread then -lpthread to enable POSIX Threads])
 200 elif test "x$enableval" != "xno"; then
 201    PTHREAD_CFLAGS=$enableval
 202    AC_MSG_NOTICE([Setting '$PTHREAD_CFLAGS' as the FLAGS to enable POSIX Threads])
 203 else
 204    AC_MSG_NOTICE([POSIX Threads will be disabled.])
 205    NO_PTHREADS=YesPlease
 206    USER_NOPTHREAD=1
 207 fi],
 208 [
 209    AC_MSG_NOTICE([Will try -pthread then -lpthread to enable POSIX Threads.])
 210 ])
 211
 212 # Define option to enable JavaScript minification
 213 AC_ARG_ENABLE([jsmin],
 214 [AS_HELP_STRING([--enable-jsmin=PATH],
 215   [PATH is the name of a JavaScript minifier or the absolute path to one.])],
 216 [
 217   JSMIN=$enableval;
 218   AC_MSG_NOTICE([Setting JSMIN to '$JSMIN' to enable JavaScript minifying])
 219   GIT_CONF_SUBST([JSMIN])
 220 ])
 221
 222 # Define option to enable CSS minification
 223 AC_ARG_ENABLE([cssmin],
 224 [AS_HELP_STRING([--enable-cssmin=PATH],
 225   [PATH is the name of a CSS minifier or the absolute path to one.])],
 226 [
 227   CSSMIN=$enableval;
 228   AC_MSG_NOTICE([Setting CSSMIN to '$CSSMIN' to enable CSS minifying])
 229   GIT_CONF_SUBST([CSSMIN])
 230 ])
 231
 232 ## Site configuration (override autodetection)
 233 ## --with-PACKAGE[=ARG] and --without-PACKAGE
 234 AC_MSG_NOTICE([CHECKS for site configuration])
 235 #
 236 # Define NO_SVN_TESTS if you want to skip time-consuming SVN interoperability
 237 # tests.  These tests take up a significant amount of the total test time
 238 # but are not needed unless you plan to talk to SVN repos.
 239 #
 240 # Define PPC_SHA1 environment variable when running make to make use of
 241 # a bundled SHA1 routine optimized for PowerPC.
 242 #
 243 # Define NO_OPENSSL environment variable if you do not have OpenSSL.
 244 # This also implies BLK_SHA1.
 245 #
 246 # Define OPENSSLDIR=/foo/bar if your openssl header and library files are in
 247 # /foo/bar/include and /foo/bar/lib directories.
 248 AC_ARG_WITH(openssl,
 249 AS_HELP_STRING([--with-openssl],[use OpenSSL library (default is YES)])
 250 AS_HELP_STRING([],              [ARG can be prefix for openssl library and headers]),
 251 GIT_PARSE_WITH([openssl]))
 252
 253 # Define USE_LIBPCRE if you have and want to use libpcre. git-grep will be
 254 # able to use Perl-compatible regular expressions.
 255 #
 256 # Define LIBPCREDIR=/foo/bar if your libpcre header and library files are in
 257 # /foo/bar/include and /foo/bar/lib directories.
 258 #
 259 AC_ARG_WITH(libpcre,
 260 AS_HELP_STRING([--with-libpcre],[support Perl-compatible regexes (default is NO)])
 261 AS_HELP_STRING([],           [ARG can be also prefix for libpcre library and headers]),
 262     if test "$withval" = "no"; then
 263         USE_LIBPCRE=
 264     elif test "$withval" = "yes"; then
 265         USE_LIBPCRE=YesPlease
 266     else
 267         USE_LIBPCRE=YesPlease
 268         LIBPCREDIR=$withval
 269         AC_MSG_NOTICE([Setting LIBPCREDIR to $LIBPCREDIR])
 270         dnl USE_LIBPCRE can still be modified below, so don't substitute
 271         dnl it yet.
 272         GIT_CONF_SUBST([LIBPCREDIR])
 273     fi)
 274 #
 275 # Define NO_CURL if you do not have curl installed.  git-http-pull and
 276 # git-http-push are not built, and you cannot use http:// and https://
 277 # transports.
 278 #
 279 # Define CURLDIR=/foo/bar if your curl header and library files are in
 280 # /foo/bar/include and /foo/bar/lib directories.
 281 AC_ARG_WITH(curl,
 282 AS_HELP_STRING([--with-curl],[support http(s):// transports (default is YES)])
 283 AS_HELP_STRING([],           [ARG can be also prefix for curl library and headers]),
 284 GIT_PARSE_WITH(curl))
 285 #
 286 # Define NO_EXPAT if you do not have expat installed.  git-http-push is
 287 # not built, and you cannot push using http:// and https:// transports.
 288 #
 289 # Define EXPATDIR=/foo/bar if your expat header and library files are in
 290 # /foo/bar/include and /foo/bar/lib directories.
 291 AC_ARG_WITH(expat,
 292 AS_HELP_STRING([--with-expat],
 293 [support git-push using http:// and https:// transports via WebDAV (default is YES)])
 294 AS_HELP_STRING([],            [ARG can be also prefix for expat library and headers]),
 295 GIT_PARSE_WITH(expat))
 296 #
 297 # Define NO_FINK if you are building on Darwin/Mac OS X, have Fink
 298 # installed in /sw, but don't want GIT to link against any libraries
 299 # installed there.  If defined you may specify your own (or Fink's)
 300 # include directories and library directories by defining CFLAGS
 301 # and LDFLAGS appropriately.
 302 #
 303 # Define NO_DARWIN_PORTS if you are building on Darwin/Mac OS X,
 304 # have DarwinPorts installed in /opt/local, but don't want GIT to
 305 # link against any libraries installed there.  If defined you may
 306 # specify your own (or DarwinPort's) include directories and
 307 # library directories by defining CFLAGS and LDFLAGS appropriately.
 308 #
 309 # Define NO_MMAP if you want to avoid mmap.
 310 #
 311 # Define NO_ICONV if your libc does not properly support iconv.
 312 AC_ARG_WITH(iconv,
 313 AS_HELP_STRING([--without-iconv],
 314 [if your architecture doesn't properly support iconv])
 315 AS_HELP_STRING([--with-iconv=PATH],
 316 [PATH is prefix for libiconv library and headers])
 317 AS_HELP_STRING([],
 318 [used only if you need linking with libiconv]),
 319 GIT_PARSE_WITH(iconv))
 320
 321 ## --enable-FEATURE[=ARG] and --disable-FEATURE
 322 #
 323 # Define USE_NSEC below if you want git to care about sub-second file mtimes
 324 # and ctimes. Note that you need recent glibc (at least 2.2.4) for this, and
 325 # it will BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely
 326 # randomly break unless your underlying filesystem supports those sub-second
 327 # times (my ext3 doesn't).
 328 #
 329 # Define USE_STDEV below if you want git to care about the underlying device
 330 # change being considered an inode change from the update-index perspective.
 331
 332 #
 333 # Allow user to set ETC_GITCONFIG variable
 334 GIT_PARSE_WITH_SET_MAKE_VAR(gitconfig, ETC_GITCONFIG,
 335                         Use VALUE instead of /etc/gitconfig as the
 336                         global git configuration file.
 337                         If VALUE is not fully qualified it will be interpreted
 338                         as a path relative to the computed prefix at runtime.)
 339
 340 #
 341 # Allow user to set ETC_GITATTRIBUTES variable
 342 GIT_PARSE_WITH_SET_MAKE_VAR(gitattributes, ETC_GITATTRIBUTES,
 343                         Use VALUE instead of /etc/gitattributes as the
 344                         global git attributes file.
 345                         If VALUE is not fully qualified it will be interpreted
 346                         as a path relative to the computed prefix at runtime.)
 347
 348 #
 349 # Allow user to set the default pager
 350 GIT_PARSE_WITH_SET_MAKE_VAR(pager, DEFAULT_PAGER,
 351                         Use VALUE as the fall-back pager instead of 'less'.
 352                         This is used by things like 'git log' when the user
 353                         does not specify a pager to use through alternate
 354                         methods. eg: /usr/bin/pager)
 355 #
 356 # Allow user to set the default editor
 357 GIT_PARSE_WITH_SET_MAKE_VAR(editor, DEFAULT_EDITOR,
 358                         Use VALUE as the fall-back editor instead of 'vi'.
 359                         This is used by things like 'git commit' when the user
 360                         does not specify a preferred editor through other
 361                         methods. eg: /usr/bin/editor)
 362
 363 #
 364 # Define SHELL_PATH to provide path to shell.
 365 GIT_ARG_SET_PATH(shell)
 366 #
 367 # Define PERL_PATH to provide path to Perl.
 368 GIT_ARG_SET_PATH(perl)
 369 #
 370 # Define PYTHON_PATH to provide path to Python.
 371 GIT_ARG_SET_PATH(python, allow-without)
 372 #
 373 # Define ZLIB_PATH to provide path to zlib.
 374 GIT_ARG_SET_PATH(zlib)
 375 #
 376 # Declare the with-tcltk/without-tcltk options.
 377 AC_ARG_WITH(tcltk,
 378 AS_HELP_STRING([--with-tcltk],[use Tcl/Tk GUI (default is YES)])
 379 AS_HELP_STRING([],[ARG is the full path to the Tcl/Tk interpreter.])
 380 AS_HELP_STRING([],[Bare --with-tcltk will make the GUI part only if])
 381 AS_HELP_STRING([],[Tcl/Tk interpreter will be found in a system.]),
 382 GIT_PARSE_WITH(tcltk))
 383 #
 384
 385
 386 ## Checks for programs.
 387 AC_MSG_NOTICE([CHECKS for programs])
 388 #
 389 AC_PROG_CC([cc gcc])
 390 AC_C_INLINE
 391 case $ac_cv_c_inline in
 392   inline | yes | no) INLINE='';;
 393   *)                 INLINE=$ac_cv_c_inline ;;
 394 esac
 395 GIT_CONF_SUBST([INLINE])
 396
 397 # which switch to pass runtime path to dynamic libraries to the linker
 398 AC_CACHE_CHECK([if linker supports -R], git_cv_ld_dashr, [
 399    SAVE_LDFLAGS="${LDFLAGS}"
 400    LDFLAGS="${SAVE_LDFLAGS} -R /"
 401    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [git_cv_ld_dashr=yes], [git_cv_ld_dashr=no])
 402    LDFLAGS="${SAVE_LDFLAGS}"
 403 ])
 404 if test "$git_cv_ld_dashr" = "yes"; then
 405    CC_LD_DYNPATH=-R
 406 else
 407    AC_CACHE_CHECK([if linker supports -Wl,-rpath,], git_cv_ld_wl_rpath, [
 408       SAVE_LDFLAGS="${LDFLAGS}"
 409       LDFLAGS="${SAVE_LDFLAGS} -Wl,-rpath,/"
 410       AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [git_cv_ld_wl_rpath=yes], [git_cv_ld_wl_rpath=no])
 411       LDFLAGS="${SAVE_LDFLAGS}"
 412    ])
 413    if test "$git_cv_ld_wl_rpath" = "yes"; then
 414       CC_LD_DYNPATH=-Wl,-rpath,
 415    else
 416       AC_CACHE_CHECK([if linker supports -rpath], git_cv_ld_rpath, [
 417          SAVE_LDFLAGS="${LDFLAGS}"
 418          LDFLAGS="${SAVE_LDFLAGS} -rpath /"
 419          AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [git_cv_ld_rpath=yes], [git_cv_ld_rpath=no])
 420          LDFLAGS="${SAVE_LDFLAGS}"
 421       ])
 422       if test "$git_cv_ld_rpath" = "yes"; then
 423          CC_LD_DYNPATH=-rpath
 424       else
 425          CC_LD_DYNPATH=
 426          AC_MSG_WARN([linker does not support runtime path to dynamic libraries])
 427       fi
 428    fi
 429 fi
 430 GIT_CONF_SUBST([CC_LD_DYNPATH])
 431 #AC_PROG_INSTALL                # needs install-sh or install.sh in sources
 432 AC_CHECK_TOOLS(AR, [gar ar], :)
 433 AC_CHECK_PROGS(TAR, [gtar tar])
 434 AC_CHECK_PROGS(DIFF, [gnudiff gdiff diff])
 435 # TCLTK_PATH will be set to some value if we want Tcl/Tk
 436 # or will be empty otherwise.
 437 if test -n "$NO_TCLTK"; then
 438   TCLTK_PATH=
 439 else
 440   if test "$with_tcltk" = ""; then
 441   # No Tcl/Tk switches given. Do not check for Tcl/Tk, use bare 'wish'.
 442     TCLTK_PATH=wish
 443   elif test "$with_tcltk" = "yes"; then
 444   # Tcl/Tk check requested.
 445     AC_CHECK_PROGS(TCLTK_PATH, [wish], )
 446   else
 447     AC_MSG_RESULT([Using Tcl/Tk interpreter $with_tcltk])
 448     TCLTK_PATH="$with_tcltk"
 449   fi
 450 fi
 451 GIT_CONF_SUBST([TCLTK_PATH])
 452 AC_CHECK_PROGS(ASCIIDOC, [asciidoc])
 453 if test -n "$ASCIIDOC"; then
 454         AC_MSG_CHECKING([for asciidoc version])
 455         asciidoc_version=`$ASCIIDOC --version 2>/dev/null`
 456         case "${asciidoc_version}" in
 457         asciidoc' '8*)
 458                 AC_MSG_RESULT([${asciidoc_version}])
 459                 ;;
 460         *)
 461                 AC_MSG_RESULT([${asciidoc_version} (unknown)])
 462                 ;;
 463         esac
 464 fi
 465
 466
 467 ## Checks for libraries.
 468 AC_MSG_NOTICE([CHECKS for libraries])
 469 #
 470 # Define NO_OPENSSL environment variable if you do not have OpenSSL.
 471 # Define NEEDS_SSL_WITH_CRYPTO if you need -lcrypto with -lssl (Darwin).
 472
 473 GIT_STASH_FLAGS($OPENSSLDIR)
 474
 475 AC_CHECK_LIB([crypto], [SHA1_Init],
 476 [NEEDS_SSL_WITH_CRYPTO=],
 477 [AC_CHECK_LIB([ssl], [SHA1_Init],
 478  [NEEDS_SSL_WITH_CRYPTO=YesPlease NO_OPENSSL=],
 479  [NEEDS_SSL_WITH_CRYPTO=          NO_OPENSSL=YesPlease])])
 480
 481 GIT_UNSTASH_FLAGS($OPENSSLDIR)
 482
 483 GIT_CONF_SUBST([NEEDS_SSL_WITH_CRYPTO])
 484 GIT_CONF_SUBST([NO_OPENSSL])
 485
 486 #
 487 # Define USE_LIBPCRE if you have and want to use libpcre. git-grep will be
 488 # able to use Perl-compatible regular expressions.
 489 #
 490
 491 if test -n "$USE_LIBPCRE"; then
 492
 493 GIT_STASH_FLAGS($LIBPCREDIR)
 494
 495 AC_CHECK_LIB([pcre], [pcre_version],
 496 [USE_LIBPCRE=YesPlease],
 497 [USE_LIBPCRE=])
 498
 499 GIT_UNSTASH_FLAGS($LIBPCREDIR)
 500
 501 GIT_CONF_SUBST([USE_LIBPCRE])
 502
 503 fi
 504
 505 #
 506 # Define NO_CURL if you do not have libcurl installed.  git-http-pull and
 507 # git-http-push are not built, and you cannot use http:// and https://
 508 # transports.
 509
 510 GIT_STASH_FLAGS($CURLDIR)
 511
 512 AC_CHECK_LIB([curl], [curl_global_init],
 513 [NO_CURL=],
 514 [NO_CURL=YesPlease])
 515
 516 GIT_UNSTASH_FLAGS($CURLDIR)
 517
 518 GIT_CONF_SUBST([NO_CURL])
 519
 520 #
 521 # Define NO_EXPAT if you do not have expat installed.  git-http-push is
 522 # not built, and you cannot push using http:// and https:// transports.
 523
 524 GIT_STASH_FLAGS($EXPATDIR)
 525
 526 AC_CHECK_LIB([expat], [XML_ParserCreate],
 527 [NO_EXPAT=],
 528 [NO_EXPAT=YesPlease])
 529
 530 GIT_UNSTASH_FLAGS($EXPATDIR)
 531
 532 GIT_CONF_SUBST([NO_EXPAT])
 533
 534 #
 535 # Define NEEDS_LIBICONV if linking with libc is not enough (Darwin and
 536 # some Solaris installations).
 537 # Define NO_ICONV if neither libc nor libiconv support iconv.
 538
 539 if test -z "$NO_ICONV"; then
 540
 541 GIT_STASH_FLAGS($ICONVDIR)
 542
 543 AC_DEFUN([ICONVTEST_SRC],
 544 [AC_LANG_PROGRAM([#include <iconv.h>],
 545  [iconv_open("", "");])])
 546
 547 if test -n "$ICONVDIR"; then
 548    lib_order="-liconv -lc"
 549 else
 550    lib_order="-lc -liconv"
 551 fi
 552
 553 NO_ICONV=YesPlease
 554
 555 for l in $lib_order; do
 556     if test "$l" = "-liconv"; then
 557        NEEDS_LIBICONV=YesPlease
 558     else
 559        NEEDS_LIBICONV=
 560     fi
 561
 562     old_LIBS="$LIBS"
 563     LIBS="$LIBS $l"
 564     AC_MSG_CHECKING([for iconv in $l])
 565     AC_LINK_IFELSE([ICONVTEST_SRC],
 566         [AC_MSG_RESULT([yes])
 567         NO_ICONV=
 568         break],
 569         [AC_MSG_RESULT([no])])
 570     LIBS="$old_LIBS"
 571 done
 572
 573 #in case of break
 574 LIBS="$old_LIBS"
 575
 576 GIT_UNSTASH_FLAGS($ICONVDIR)
 577
 578 GIT_CONF_SUBST([NEEDS_LIBICONV])
 579 GIT_CONF_SUBST([NO_ICONV])
 580
 581 if test -n "$NO_ICONV"; then
 582     NEEDS_LIBICONV=
 583 fi
 584
 585 fi
 586
 587 #
 588 # Define NO_DEFLATE_BOUND if deflateBound is missing from zlib.
 589
 590 GIT_STASH_FLAGS($ZLIB_PATH)
 591
 592 AC_DEFUN([ZLIBTEST_SRC], [
 593 AC_LANG_PROGRAM([#include <zlib.h>],
 594  [deflateBound(0, 0);])])
 595 AC_MSG_CHECKING([for deflateBound in -lz])
 596 old_LIBS="$LIBS"
 597 LIBS="$LIBS -lz"
 598 AC_LINK_IFELSE([ZLIBTEST_SRC],
 599         [AC_MSG_RESULT([yes])],
 600         [AC_MSG_RESULT([no])
 601         NO_DEFLATE_BOUND=yes])
 602 LIBS="$old_LIBS"
 603
 604 GIT_UNSTASH_FLAGS($ZLIB_PATH)
 605
 606 GIT_CONF_SUBST([NO_DEFLATE_BOUND])
 607
 608 #
 609 # Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
 610 # Patrick Mauritz).
 611 AC_CHECK_LIB([c], [socket],
 612 [NEEDS_SOCKET=],
 613 [NEEDS_SOCKET=YesPlease])
 614 GIT_CONF_SUBST([NEEDS_SOCKET])
 615 test -n "$NEEDS_SOCKET" && LIBS="$LIBS -lsocket"
 616
 617 #
 618 # The next few tests will define NEEDS_RESOLV if linking with
 619 # libresolv provides some of the functions we would normally get
 620 # from libc.
 621 NEEDS_RESOLV=
 622 #
 623 # Define NO_INET_NTOP if linking with -lresolv is not enough.
 624 # Solaris 2.7 in particular hos inet_ntop in -lresolv.
 625 NO_INET_NTOP=
 626 AC_CHECK_FUNC([inet_ntop],
 627     [],
 628     [AC_CHECK_LIB([resolv], [inet_ntop],
 629         [NEEDS_RESOLV=YesPlease],
 630         [NO_INET_NTOP=YesPlease])
 631 ])
 632 GIT_CONF_SUBST([NO_INET_NTOP])
 633 #
 634 # Define NO_INET_PTON if linking with -lresolv is not enough.
 635 # Solaris 2.7 in particular hos inet_pton in -lresolv.
 636 NO_INET_PTON=
 637 AC_CHECK_FUNC([inet_pton],
 638     [],
 639     [AC_CHECK_LIB([resolv], [inet_pton],
 640         [NEEDS_RESOLV=YesPlease],
 641         [NO_INET_PTON=YesPlease])
 642 ])
 643 GIT_CONF_SUBST([NO_INET_PTON])
 644 #
 645 # Define NO_HSTRERROR if linking with -lresolv is not enough.
 646 # Solaris 2.6 in particular has no hstrerror, even in -lresolv.
 647 NO_HSTRERROR=
 648 AC_CHECK_FUNC([hstrerror],
 649     [],
 650     [AC_CHECK_LIB([resolv], [hstrerror],
 651         [NEEDS_RESOLV=YesPlease],
 652         [NO_HSTRERROR=YesPlease])
 653 ])
 654 GIT_CONF_SUBST([NO_HSTRERROR])
 655
 656 dnl This must go after all the possible places for its initialization,
 657 dnl in the AC_CHECK_FUNC invocations above.
 658 GIT_CONF_SUBST([NEEDS_RESOLV])
 659 #
 660 # If any of the above tests determined that -lresolv is needed at
 661 # build-time, also set it here for remaining configure-time checks.
 662 test -n "$NEEDS_RESOLV" && LIBS="$LIBS -lresolv"
 663
 664 AC_CHECK_LIB([c], [basename],
 665 [NEEDS_LIBGEN=],
 666 [NEEDS_LIBGEN=YesPlease])
 667 GIT_CONF_SUBST([NEEDS_LIBGEN])
 668 test -n "$NEEDS_LIBGEN" && LIBS="$LIBS -lgen"
 669
 670 AC_CHECK_LIB([c], [gettext],
 671 [LIBC_CONTAINS_LIBINTL=YesPlease],
 672 [LIBC_CONTAINS_LIBINTL=])
 673 GIT_CONF_SUBST([LIBC_CONTAINS_LIBINTL])
 674
 675 #
 676 # Define NO_GETTEXT if you don't want Git output to be translated.
 677 # A translated Git requires GNU libintl or another gettext implementation
 678 AC_CHECK_HEADER([libintl.h],
 679 [NO_GETTEXT=],
 680 [NO_GETTEXT=YesPlease])
 681 GIT_CONF_SUBST([NO_GETTEXT])
 682
 683 if test -z "$NO_GETTEXT"; then
 684     test -n "$LIBC_CONTAINS_LIBINTL" || LIBS="$LIBS -lintl"
 685 fi
 686
 687 ## Checks for header files.
 688 AC_MSG_NOTICE([CHECKS for header files])
 689 #
 690 # Define NO_SYS_SELECT_H if you don't have sys/select.h.
 691 AC_CHECK_HEADER([sys/select.h],
 692 [NO_SYS_SELECT_H=],
 693 [NO_SYS_SELECT_H=UnfortunatelyYes])
 694 GIT_CONF_SUBST([NO_SYS_SELECT_H])
 695 #
 696 # Define NO_SYS_POLL_H if you don't have sys/poll.h
 697 AC_CHECK_HEADER([sys/poll.h],
 698 [NO_SYS_POLL_H=],
 699 [NO_SYS_POLL_H=UnfortunatelyYes])
 700 GIT_CONF_SUBST([NO_SYS_POLL_H])
 701 #
 702 # Define NO_INTTYPES_H if you don't have inttypes.h
 703 AC_CHECK_HEADER([inttypes.h],
 704 [NO_INTTYPES_H=],
 705 [NO_INTTYPES_H=UnfortunatelyYes])
 706 GIT_CONF_SUBST([NO_INTTYPES_H])
 707 #
 708 # Define OLD_ICONV if your library has an old iconv(), where the second
 709 # (input buffer pointer) parameter is declared with type (const char **).
 710 AC_DEFUN([OLDICONVTEST_SRC], [
 711 AC_LANG_PROGRAM([[
 712 #include <iconv.h>
 713
 714 extern size_t iconv(iconv_t cd,
 715                     char **inbuf, size_t *inbytesleft,
 716                     char **outbuf, size_t *outbytesleft);
 717 ]], [])])
 718
 719 GIT_STASH_FLAGS($ICONVDIR)
 720
 721 AC_MSG_CHECKING([for old iconv()])
 722 AC_COMPILE_IFELSE([OLDICONVTEST_SRC],
 723         [AC_MSG_RESULT([no])],
 724         [AC_MSG_RESULT([yes])
 725         OLD_ICONV=UnfortunatelyYes])
 726
 727 GIT_UNSTASH_FLAGS($ICONVDIR)
 728
 729 GIT_CONF_SUBST([OLD_ICONV])
 730
 731 ## Checks for typedefs, structures, and compiler characteristics.
 732 AC_MSG_NOTICE([CHECKS for typedefs, structures, and compiler characteristics])
 733 #
 734 TYPE_SOCKLEN_T
 735 case $ac_cv_type_socklen_t in
 736   yes)  SOCKLEN_T='';;
 737   *)    SOCKLEN_T=$git_cv_socklen_t_equiv;;
 738 esac
 739 GIT_CONF_SUBST([SOCKLEN_T])
 740
 741 # Define NO_D_INO_IN_DIRENT if you don't have d_ino in your struct dirent.
 742 AC_CHECK_MEMBER(struct dirent.d_ino,
 743 [NO_D_INO_IN_DIRENT=],
 744 [NO_D_INO_IN_DIRENT=YesPlease],
 745 [#include <dirent.h>])
 746 GIT_CONF_SUBST([NO_D_INO_IN_DIRENT])
 747 #
 748 # Define NO_D_TYPE_IN_DIRENT if your platform defines DT_UNKNOWN but lacks
 749 # d_type in struct dirent (latest Cygwin -- will be fixed soonish).
 750 AC_CHECK_MEMBER(struct dirent.d_type,
 751 [NO_D_TYPE_IN_DIRENT=],
 752 [NO_D_TYPE_IN_DIRENT=YesPlease],
 753 [#include <dirent.h>])
 754 GIT_CONF_SUBST([NO_D_TYPE_IN_DIRENT])
 755 #
 756 # Define NO_GECOS_IN_PWENT if you don't have pw_gecos in struct passwd
 757 # in the C library.
 758 AC_CHECK_MEMBER(struct passwd.pw_gecos,
 759 [NO_GECOS_IN_PWENT=],
 760 [NO_GECOS_IN_PWENT=YesPlease],
 761 [#include <pwd.h>])
 762 GIT_CONF_SUBST([NO_GECOS_IN_PWENT])
 763 #
 764 # Define NO_SOCKADDR_STORAGE if your platform does not have struct
 765 # sockaddr_storage.
 766 AC_CHECK_TYPE(struct sockaddr_storage,
 767 [NO_SOCKADDR_STORAGE=],
 768 [NO_SOCKADDR_STORAGE=YesPlease],[
 769 #include <sys/types.h>
 770 #include <sys/socket.h>
 771 ])
 772 GIT_CONF_SUBST([NO_SOCKADDR_STORAGE])
 773 #
 774 # Define NO_IPV6 if you lack IPv6 support and getaddrinfo().
 775 AC_CHECK_TYPE([struct addrinfo],[
 776  GIT_CHECK_FUNC([getaddrinfo],
 777   [NO_IPV6=],
 778   [NO_IPV6=YesPlease])
 779 ],[NO_IPV6=YesPlease],[
 780 #include <sys/types.h>
 781 #include <sys/socket.h>
 782 #include <netdb.h>
 783 ])
 784 GIT_CONF_SUBST([NO_IPV6])
 785 #
 786 # Define NO_REGEX if you have no or inferior regex support in your C library.
 787 AC_CACHE_CHECK([whether the platform regex can handle null bytes],
 788  [ac_cv_c_excellent_regex], [
 789 AC_EGREP_CPP(yippeeyeswehaveit,
 790         AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
 791 #include <regex.h>
 792 ],
 793 [#ifdef REG_STARTEND
 794 yippeeyeswehaveit
 795 #endif
 796 ]),
 797         [ac_cv_c_excellent_regex=yes],
 798         [ac_cv_c_excellent_regex=no])
 799 ])
 800 if test $ac_cv_c_excellent_regex = yes; then
 801         NO_REGEX=
 802 else
 803         NO_REGEX=YesPlease
 804 fi
 805 GIT_CONF_SUBST([NO_REGEX])
 806 #
 807 # Define FREAD_READS_DIRECTORIES if your are on a system which succeeds
 808 # when attempting to read from an fopen'ed directory.
 809 AC_CACHE_CHECK([whether system succeeds to read fopen'ed directory],
 810  [ac_cv_fread_reads_directories],
 811 [
 812 AC_RUN_IFELSE(
 813         [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
 814                 [[char c;
 815                 FILE *f = fopen(".", "r");
 816                 return f && fread(&c, 1, 1, f)]])],
 817         [ac_cv_fread_reads_directories=no],
 818         [ac_cv_fread_reads_directories=yes])
 819 ])
 820 if test $ac_cv_fread_reads_directories = yes; then
 821         FREAD_READS_DIRECTORIES=UnfortunatelyYes
 822 else
 823         FREAD_READS_DIRECTORIES=
 824 fi
 825 GIT_CONF_SUBST([FREAD_READS_DIRECTORIES])
 826 #
 827 # Define SNPRINTF_RETURNS_BOGUS if your are on a system which snprintf()
 828 # or vsnprintf() return -1 instead of number of characters which would
 829 # have been written to the final string if enough space had been available.
 830 AC_CACHE_CHECK([whether snprintf() and/or vsnprintf() return bogus value],
 831  [ac_cv_snprintf_returns_bogus],
 832 [
 833 AC_RUN_IFELSE(
 834         [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
 835                 #include "stdarg.h"
 836
 837                 int test_vsnprintf(char *str, size_t maxsize, const char *format, ...)
 838                 {
 839                   int ret;
 840                   va_list ap;
 841                   va_start(ap, format);
 842                   ret = vsnprintf(str, maxsize, format, ap);
 843                   va_end(ap);
 844                   return ret;
 845                 }],
 846                 [[char buf[6];
 847                   if (test_vsnprintf(buf, 3, "%s", "12345") != 5
 848                       || strcmp(buf, "12")) return 1;
 849                   if (snprintf(buf, 3, "%s", "12345") != 5
 850                       || strcmp(buf, "12")) return 1]])],
 851         [ac_cv_snprintf_returns_bogus=no],
 852         [ac_cv_snprintf_returns_bogus=yes])
 853 ])
 854 if test $ac_cv_snprintf_returns_bogus = yes; then
 855         SNPRINTF_RETURNS_BOGUS=UnfortunatelyYes
 856 else
 857         SNPRINTF_RETURNS_BOGUS=
 858 fi
 859 GIT_CONF_SUBST([SNPRINTF_RETURNS_BOGUS])
 860
 861
 862 ## Checks for library functions.
 863 ## (in default C library and libraries checked by AC_CHECK_LIB)
 864 AC_MSG_NOTICE([CHECKS for library functions])
 865 #
 866 # Define NO_LIBGEN_H if you don't have libgen.h.
 867 AC_CHECK_HEADER([libgen.h],
 868 [NO_LIBGEN_H=],
 869 [NO_LIBGEN_H=YesPlease])
 870 GIT_CONF_SUBST([NO_LIBGEN_H])
 871 #
 872 # Define HAVE_PATHS_H if you have paths.h.
 873 AC_CHECK_HEADER([paths.h],
 874 [HAVE_PATHS_H=YesPlease],
 875 [HAVE_PATHS_H=])
 876 GIT_CONF_SUBST([HAVE_PATHS_H])
 877 #
 878 # Define HAVE_LIBCHARSET_H if have libcharset.h
 879 AC_CHECK_HEADER([libcharset.h],
 880 [HAVE_LIBCHARSET_H=YesPlease],
 881 [HAVE_LIBCHARSET_H=])
 882 GIT_CONF_SUBST([HAVE_LIBCHARSET_H])
 883 #
 884 # Define HAVE_STRINGS_H if you have strings.h
 885 AC_CHECK_HEADER([strings.h],
 886 [HAVE_STRINGS_H=YesPlease],
 887 [HAVE_STRINGS_H=])
 888 GIT_CONF_SUBST([HAVE_STRINGS_H])
 889 # Define CHARSET_LIB if libiconv does not export the locale_charset symbol
 890 # and libcharset does
 891 CHARSET_LIB=
 892 AC_CHECK_LIB([iconv], [locale_charset],
 893        [],
 894        [AC_CHECK_LIB([charset], [locale_charset],
 895                      [CHARSET_LIB=-lcharset])])
 896 GIT_CONF_SUBST([CHARSET_LIB])
 897 #
 898 # Define NO_STRCASESTR if you don't have strcasestr.
 899 GIT_CHECK_FUNC(strcasestr,
 900 [NO_STRCASESTR=],
 901 [NO_STRCASESTR=YesPlease])
 902 GIT_CONF_SUBST([NO_STRCASESTR])
 903 #
 904 # Define NO_FNMATCH if you don't have fnmatch
 905 GIT_CHECK_FUNC(fnmatch,
 906 [NO_FNMATCH=],
 907 [NO_FNMATCH=YesPlease])
 908 GIT_CONF_SUBST([NO_FNMATCH])
 909 #
 910 # Define NO_FNMATCH_CASEFOLD if your fnmatch function doesn't have the
 911 # FNM_CASEFOLD GNU extension.
 912 AC_CACHE_CHECK([whether the fnmatch function supports the FNMATCH_CASEFOLD GNU extension],
 913  [ac_cv_c_excellent_fnmatch], [
 914 AC_EGREP_CPP(yippeeyeswehaveit,
 915         AC_LANG_PROGRAM([
 916 #include <fnmatch.h>
 917 ],
 918 [#ifdef FNM_CASEFOLD
 919 yippeeyeswehaveit
 920 #endif
 921 ]),
 922         [ac_cv_c_excellent_fnmatch=yes],
 923         [ac_cv_c_excellent_fnmatch=no])
 924 ])
 925 if test $ac_cv_c_excellent_fnmatch = yes; then
 926         NO_FNMATCH_CASEFOLD=
 927 else
 928         NO_FNMATCH_CASEFOLD=YesPlease
 929 fi
 930 GIT_CONF_SUBST([NO_FNMATCH_CASEFOLD])
 931 #
 932 # Define NO_MEMMEM if you don't have memmem.
 933 GIT_CHECK_FUNC(memmem,
 934 [NO_MEMMEM=],
 935 [NO_MEMMEM=YesPlease])
 936 GIT_CONF_SUBST([NO_MEMMEM])
 937 #
 938 # Define NO_STRLCPY if you don't have strlcpy.
 939 GIT_CHECK_FUNC(strlcpy,
 940 [NO_STRLCPY=],
 941 [NO_STRLCPY=YesPlease])
 942 GIT_CONF_SUBST([NO_STRLCPY])
 943 #
 944 # Define NO_UINTMAX_T if your platform does not have uintmax_t
 945 AC_CHECK_TYPE(uintmax_t,
 946 [NO_UINTMAX_T=],
 947 [NO_UINTMAX_T=YesPlease],[
 948 #include <inttypes.h>
 949 ])
 950 GIT_CONF_SUBST([NO_UINTMAX_T])
 951 #
 952 # Define NO_STRTOUMAX if you don't have strtoumax in the C library.
 953 GIT_CHECK_FUNC(strtoumax,
 954 [NO_STRTOUMAX=],
 955 [NO_STRTOUMAX=YesPlease])
 956 GIT_CONF_SUBST([NO_STRTOUMAX])
 957 #
 958 # Define NO_SETENV if you don't have setenv in the C library.
 959 GIT_CHECK_FUNC(setenv,
 960 [NO_SETENV=],
 961 [NO_SETENV=YesPlease])
 962 GIT_CONF_SUBST([NO_SETENV])
 963 #
 964 # Define NO_UNSETENV if you don't have unsetenv in the C library.
 965 GIT_CHECK_FUNC(unsetenv,
 966 [NO_UNSETENV=],
 967 [NO_UNSETENV=YesPlease])
 968 GIT_CONF_SUBST([NO_UNSETENV])
 969 #
 970 # Define NO_MKDTEMP if you don't have mkdtemp in the C library.
 971 GIT_CHECK_FUNC(mkdtemp,
 972 [NO_MKDTEMP=],
 973 [NO_MKDTEMP=YesPlease])
 974 GIT_CONF_SUBST([NO_MKDTEMP])
 975 #
 976 # Define NO_MKSTEMPS if you don't have mkstemps in the C library.
 977 GIT_CHECK_FUNC(mkstemps,
 978 [NO_MKSTEMPS=],
 979 [NO_MKSTEMPS=YesPlease])
 980 GIT_CONF_SUBST([NO_MKSTEMPS])
 981 #
 982 # Define NO_INITGROUPS if you don't have initgroups in the C library.
 983 GIT_CHECK_FUNC(initgroups,
 984 [NO_INITGROUPS=],
 985 [NO_INITGROUPS=YesPlease])
 986 GIT_CONF_SUBST([NO_INITGROUPS])
 987 #
 988 #
 989 # Define NO_MMAP if you want to avoid mmap.
 990 #
 991 # Define NO_ICONV if your libc does not properly support iconv.
 992
 993
 994 ## Other checks.
 995 # Define USE_PIC if you need the main git objects to be built with -fPIC
 996 # in order to build and link perl/Git.so.  x86-64 seems to need this.
 997 #
 998 # Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link.
 999 # Enable it on Windows.  By default, symrefs are still used.
1000 #
1001 # Define NO_PTHREADS if we do not have pthreads.
1002 #
1003 # Define PTHREAD_LIBS to the linker flag used for Pthread support.
1004 AC_DEFUN([PTHREADTEST_SRC], [
1005 AC_LANG_PROGRAM([[
1006 #include <pthread.h>
1007 ]], [[
1008         pthread_mutex_t test_mutex;
1009         pthread_key_t test_key;
1010         int retcode = 0;
1011         retcode |= pthread_key_create(&test_key, (void *)0);
1012         retcode |= pthread_mutex_init(&test_mutex,(void *)0);
1013         retcode |= pthread_mutex_lock(&test_mutex);
1014         retcode |= pthread_mutex_unlock(&test_mutex);
1015         return retcode;
1016 ]])])
1017
1018 dnl AC_LANG_CONFTEST([AC_LANG_PROGRAM(
1019 dnl   [[#include <pthread.h>]],
1020 dnl   [[pthread_mutex_t test_mutex;]]
1021 dnl )])
1022
1023 NO_PTHREADS=UnfortunatelyYes
1024 PTHREAD_LIBS=
1025
1026 if test -n "$USER_NOPTHREAD"; then
1027    AC_MSG_NOTICE([Skipping POSIX Threads at user request.])
1028 # handle these separately since PTHREAD_CFLAGS could be '-lpthreads
1029 # -D_REENTRANT' or some such.
1030 elif test -z "$PTHREAD_CFLAGS"; then
1031   threads_found=no
1032   # Attempt to compile and link some code using pthreads to determine
1033   # required linker flags. The order is somewhat important here: We
1034   # first try it without any extra flags, to catch systems where
1035   # pthreads are part of the C library, then go on testing various other
1036   # flags. We do so to avoid false positives. For example, on Mac OS X
1037   # pthreads are part of the C library; moreover, the compiler allows us
1038   # to add "-mt" to the CFLAGS (although it will do nothing except
1039   # trigger a warning about an unused flag). Hence if we checked for
1040   # "-mt" before "" we would end up picking it. But unfortunately this
1041   # would then trigger compiler warnings on every single file we compile.
1042   for opt in "" -mt -pthread -lpthread; do
1043      old_CFLAGS="$CFLAGS"
1044      CFLAGS="$opt $CFLAGS"
1045      AC_MSG_CHECKING([for POSIX Threads with '$opt'])
1046      AC_LINK_IFELSE([PTHREADTEST_SRC],
1047         [AC_MSG_RESULT([yes])
1048                 NO_PTHREADS=
1049                 PTHREAD_LIBS="$opt"
1050                 PTHREAD_CFLAGS="$opt"
1051                 threads_found=yes
1052                 break
1053         ],
1054         [AC_MSG_RESULT([no])])
1055       CFLAGS="$old_CFLAGS"
1056   done
1057   if test $threads_found != yes; then
1058     AC_CHECK_LIB([pthread], [pthread_create],
1059         [PTHREAD_LIBS="-lpthread"],
1060         [NO_PTHREADS=UnfortunatelyYes])
1061   fi
1062 else
1063   old_CFLAGS="$CFLAGS"
1064   CFLAGS="$PTHREAD_CFLAGS $CFLAGS"
1065   AC_MSG_CHECKING([for POSIX Threads with '$PTHREAD_CFLAGS'])
1066   AC_LINK_IFELSE([PTHREADTEST_SRC],
1067         [AC_MSG_RESULT([yes])
1068                 NO_PTHREADS=
1069                 PTHREAD_LIBS="$PTHREAD_CFLAGS"
1070         ],
1071         [AC_MSG_RESULT([no])])
1072
1073   CFLAGS="$old_CFLAGS"
1074 fi
1075
1076 CFLAGS="$old_CFLAGS"
1077
1078 GIT_CONF_SUBST([PTHREAD_CFLAGS])
1079 GIT_CONF_SUBST([PTHREAD_LIBS])
1080 GIT_CONF_SUBST([NO_PTHREADS])
1081
1082 ## Output files
1083 AC_CONFIG_FILES(["${config_file}":"${config_in}"])
1084 AC_OUTPUT