libgo/configure.ac

   1 # configure.ac -- Go library configure script.
   2
   3 # Copyright 2009 The Go Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style
   5 # license that can be found in the LICENSE file.
   6
   7 # Process this file with autoreconf to produce configure.
   8
   9 AC_INIT(package-unused, version-unused,, libgo)
  10 AC_CONFIG_SRCDIR(Makefile.am)
  11 AC_CONFIG_HEADER(config.h)
  12
  13 libtool_VERSION=16:0:0
  14 AC_SUBST(libtool_VERSION)
  15
  16 AM_ENABLE_MULTILIB(, ..)
  17
  18 AC_CANONICAL_SYSTEM
  19 target_alias=${target_alias-$host_alias}
  20
  21 AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dist subdir-objects -Wall -Wno-portability -Wno-override])
  22 AH_TEMPLATE(PACKAGE, [Name of package])
  23 AH_TEMPLATE(VERSION, [Version number of package])
  24
  25 m4_rename([_AC_ARG_VAR_PRECIOUS],[glibgo_PRECIOUS])
  26 m4_define([_AC_ARG_VAR_PRECIOUS],[])
  27 AC_PROG_CC
  28 AC_PROG_GO
  29 AM_PROG_AS
  30 m4_rename_force([glibgo_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
  31
  32 AC_SUBST(CFLAGS)
  33
  34 case ${host} in
  35   *-*-aix*)
  36     # static hash tables crashes on AIX when libgo is built with O2
  37     CFLAGS="$CFLAGS -fno-section-anchors"
  38     GOCFLAGS="$GOCFLAGS -fno-section-anchors"
  39     ;;
  40 esac
  41
  42 AM_MAINTAINER_MODE
  43
  44 AC_PROG_LD
  45 AC_PROG_RANLIB
  46 AC_CHECK_TOOL(OBJCOPY, objcopy, missing-objcopy)
  47
  48 AC_LIBTOOL_DLOPEN
  49 AM_PROG_LIBTOOL
  50 AC_SUBST(enable_shared)
  51 AC_SUBST(enable_static)
  52
  53 CC_FOR_BUILD=${CC_FOR_BUILD:-gcc}
  54 AC_SUBST(CC_FOR_BUILD)
  55
  56 AC_PROG_AWK
  57
  58 WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
  59 AC_SUBST(WARN_FLAGS)
  60
  61 AC_ARG_ENABLE(werror, [AS_HELP_STRING([--enable-werror],
  62                                       [turns on -Werror @<:@default=yes@:>@])])
  63 if test "x$enable_werror" != "xno"; then
  64   WERROR="-Werror"
  65 fi
  66 AC_SUBST(WERROR)
  67
  68 glibgo_toolexecdir=no
  69 glibgo_toolexeclibdir=no
  70
  71 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
  72 AC_ARG_ENABLE([version-specific-runtime-libs],
  73   AC_HELP_STRING([--enable-version-specific-runtime-libs],
  74                  [Specify that runtime libraries should be installed in a compiler-specific directory]),
  75   [case "$enableval" in
  76     yes) version_specific_libs=yes ;;
  77     no)  version_specific_libs=no ;;
  78     *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  79    esac],
  80   [version_specific_libs=no])
  81 AC_MSG_RESULT($version_specific_libs)
  82
  83 GCC_WITH_TOOLEXECLIBDIR
  84
  85 # Version-specific runtime libs processing.
  86 if test $version_specific_libs = yes; then
  87   glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
  88   glibgo_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
  89 fi
  90
  91 # Calculate glibgo_toolexecdir, glibgo_toolexeclibdir
  92 # Install a library built with a cross compiler in tooldir, not libdir.
  93 if test -n "$with_cross_host" &&
  94    test x"$with_cross_host" != x"no"; then
  95   nover_glibgo_toolexecdir='${exec_prefix}/${host_alias}'
  96   case ${with_toolexeclibdir} in
  97     no)
  98       nover_glibgo_toolexeclibdir='${toolexecdir}/lib'
  99       ;;
 100     *)
 101       nover_glibgo_toolexeclibdir=${with_toolexeclibdir}
 102       ;;
 103   esac
 104 else
 105   nover_glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
 106   nover_glibgo_toolexeclibdir='${libdir}'
 107 fi
 108 multi_os_directory=`$GOC -print-multi-os-directory`
 109 case $multi_os_directory in
 110   .) ;; # Avoid trailing /.
 111   *) nover_glibgo_toolexeclibdir=${nover_glibgo_toolexeclibdir}/${multi_os_directory} ;;
 112 esac
 113
 114 if test x"$glibgo_toolexecdir" = x"no"; then
 115   glibgo_toolexecdir="${nover_glibgo_toolexecdir}"
 116   glibgo_toolexeclibdir="${nover_glibgo_toolexeclibdir}"
 117 fi
 118
 119 AC_SUBST(glibgo_toolexecdir)
 120 AC_SUBST(glibgo_toolexeclibdir)
 121 AC_SUBST(nover_glibgo_toolexeclibdir)
 122
 123 # See if the user wants to configure without libffi.  Some
 124 # architectures don't support it.  FIXME: We should set a default
 125 # based on the host.
 126 AC_ARG_WITH(libffi,
 127   AS_HELP_STRING([--without-libffi],
 128                  [don't use libffi]),
 129   [:],
 130   [with_libffi=${with_libffi_default-yes}])
 131
 132 LIBFFI=
 133 LIBFFIINCS=
 134 if test "$with_libffi" != no; then
 135    AC_DEFINE(USE_LIBFFI, 1, [Define if we're to use libffi.])
 136    LIBFFI=../libffi/libffi_convenience.la
 137    LIBFFIINCS='-I$(top_srcdir)/../libffi/include -I../libffi/include'
 138 fi
 139 AC_SUBST(LIBFFI)
 140 AC_SUBST(LIBFFIINCS)
 141 AM_CONDITIONAL(USE_LIBFFI, test "$with_libffi" != "no")
 142
 143 # See if the user wants to configure without libatomic. This is useful if we are
 144 # on an architecture for which libgo does not need an atomic support library and
 145 # libatomic does not support our C compiler.
 146 AC_ARG_WITH(libatomic,
 147   AS_HELP_STRING([--without-libatomic],
 148                  [don't use libatomic]),
 149   [:],
 150   [with_libatomic=${with_libatomic_default-yes}])
 151
 152 LIBATOMIC=
 153 if test "$with_libatomic" != no; then
 154    LIBATOMIC=../libatomic/libatomic_convenience.la
 155 fi
 156 AC_SUBST(LIBATOMIC)
 157
 158 # Used to tell GNU make to include a file without telling automake to
 159 # include it.
 160 go_include="-include"
 161 AC_SUBST(go_include)
 162
 163 # All known GOOS values.  This is the union of all operating systems
 164 # supported by the gofrontend and all operating systems supported by
 165 # the gc toolchain.
 166 ALLGOOS="aix android darwin dragonfly freebsd hurd illumos irix js linux netbsd openbsd plan9 rtems solaris windows"
 167
 168 is_darwin=no
 169 is_freebsd=no
 170 is_irix=no
 171 is_linux=no
 172 is_netbsd=no
 173 is_openbsd=no
 174 is_dragonfly=no
 175 is_rtems=no
 176 is_solaris=no
 177 is_aix=no
 178 is_hurd=no
 179 GOOS=unknown
 180 case ${host} in
 181   *-*-darwin*)   is_darwin=yes;  GOOS=darwin ;;
 182   *-*-freebsd*)  is_freebsd=yes; GOOS=freebsd ;;
 183   *-*-irix6*)    is_irix=yes;    GOOS=irix ;;
 184   *-*-linux*)    is_linux=yes;   GOOS=linux ;;
 185   *-*-netbsd*)   is_netbsd=yes;  GOOS=netbsd ;;
 186   *-*-openbsd*)  is_openbsd=yes; GOOS=openbsd ;;
 187   *-*-dragonfly*) is_dragonfly=yes; GOOS=dragonfly ;;
 188   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
 189   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
 190   *-*-aix*)      is_aix=yes;     GOOS=aix ;;
 191   *-*-gnu*)      is_hurd=yes;    GOOS=hurd ;;
 192 esac
 193 AM_CONDITIONAL(LIBGO_IS_DARWIN, test $is_darwin = yes)
 194 AM_CONDITIONAL(LIBGO_IS_FREEBSD, test $is_freebsd = yes)
 195 AM_CONDITIONAL(LIBGO_IS_IRIX, test $is_irix = yes)
 196 AM_CONDITIONAL(LIBGO_IS_LINUX, test $is_linux = yes)
 197 AM_CONDITIONAL(LIBGO_IS_NETBSD, test $is_netbsd = yes)
 198 AM_CONDITIONAL(LIBGO_IS_OPENBSD, test $is_openbsd = yes)
 199 AM_CONDITIONAL(LIBGO_IS_DRAGONFLY, test $is_dragonfly = yes)
 200 AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
 201 AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
 202 AM_CONDITIONAL(LIBGO_IS_AIX, test $is_aix = yes)
 203 AM_CONDITIONAL(LIBGO_IS_HURD, test $is_hurd = yes)
 204 AM_CONDITIONAL(LIBGO_IS_BSD, test $is_darwin = yes -o $is_dragonfly = yes -o $is_freebsd = yes -o $is_netbsd = yes -o $is_openbsd = yes)
 205 AC_SUBST(GOOS)
 206 AC_SUBST(ALLGOOS)
 207
 208 dnl Test whether we need to use DejaGNU or whether we can use the
 209 dnl simpler gotest approach.  We can only use gotest for a native
 210 dnl build.
 211 USE_DEJAGNU=no
 212 case ${host} in
 213   *-*-rtems*) USE_DEJAGNU=yes ;;
 214   ${build}) ;;
 215   *) USE_DEJAGNU=yes ;;
 216 esac
 217 AC_SUBST(USE_DEJAGNU)
 218
 219 # All known GOARCH values.  This is the union of all architectures
 220 # supported by the gofrontend and all architectures supported by the
 221 # gc toolchain.
 222 # To add a new architecture:
 223 # - add it to this list
 224 # - if appropriate, add an entry to ALLGOARCHFAMILY below
 225 # - add an entry to the case on ${host} below to set GOARCH
 226 # - update goarchList in libgo/go/go/build/syslist.go
 227 # - update goarch.sh to report the values for this architecture
 228 # - update go-set-goarch in gcc/testsuite/go.test/go-test.exp
 229 # - update ptrSizeMap and intSizeMap in libgo/go/cmd/cgo/main.go
 230 # - update arch lists in libgo/match.sh
 231 # - update arch lists in libgo/testsuite/gotest
 232 # - update +build lines in several places
 233 #   - libgo/go/runtime/lfstack_NNbit.go
 234 #   - libgo/go/runtime/hashNN.go
 235 #   - libgo/go/runtime/unalignedN.go
 236 #   - libgo/go/syscall/endian_XX.go
 237 #   - possibly others
 238 # - possibly update files in libgo/go/internal/syscall/unix
 239 ALLGOARCH="386 alpha amd64 amd64p32 arm armbe arm64 arm64be ia64 m68k mips mipsle mips64 mips64le mips64p32 mips64p32le nios2 ppc ppc64 ppc64le riscv riscv64 s390 s390x sh shbe sparc sparc64 wasm"
 240
 241 # All known GOARCH family values.
 242 ALLGOARCHFAMILY="I386 ALPHA AMD64 ARM ARM64 IA64 M68K MIPS MIPS64 NIOS2 PPC PPC64 RISCV RISCV64 S390 S390X SH SPARC SPARC64 WASM"
 243
 244 GOARCH=unknown
 245 case ${host} in
 246   alpha*-*-*)
 247     GOARCH=alpha
 248     ;;
 249   aarch64-*-*)
 250     GOARCH=arm64
 251     ;;
 252   aarch64_be-*-*)
 253     GOARCH=arm64be
 254     ;;
 255   arm*-*-* | strongarm*-*-* | ep9312*-*-* | xscale-*-*)
 256     GOARCH=arm
 257     case ${host} in
 258       arm*b*-*-*)
 259         GOARCH=armbe
 260         ;;
 261     esac
 262     ;;
 263 changequote(,)dnl
 264   i[34567]86-*-* | x86_64-*-*)
 265 changequote([,])dnl
 266     AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 267 #ifdef __x86_64__
 268 #error 64-bit
 269 #endif
 270 ])],
 271         [GOARCH=386],
 272         AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 273 #ifdef __ILP32__
 274 #error x32
 275 #endif
 276 ])],
 277         [GOARCH=amd64],
 278         [GOARCH=amd64p32]))
 279     ;;
 280   ia64-*-*)
 281     GOARCH=ia64
 282     ;;
 283   m68k*-*-*)
 284     GOARCH=m68k
 285     ;;
 286   mips*-*-*)
 287     AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 288 #if _MIPS_SIM != _ABIO32
 289 #error not o32
 290 #endif
 291 ])],
 292 [mips_abi="o32"],
 293         [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 294 #if _MIPS_SIM != _ABIN32
 295 #error not n32
 296 #endif
 297 ])],
 298 [mips_abi="n32"],
 299         [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 300 #if _MIPS_SIM != _ABI64
 301 #error not n64
 302 #endif
 303 ])],
 304 [mips_abi="n64"],
 305         [AC_MSG_ERROR([unknown MIPS ABI])
 306 [mips_abi="n32"]])])])
 307     case "$mips_abi" in
 308     "o32") GOARCH=mips ;;
 309     "n32") GOARCH=mips64p32 ;;
 310     "n64") GOARCH=mips64 ;;
 311     esac
 312     case "${host}" in
 313     mips*el-*-*)
 314         GOARCH="${GOARCH}le"
 315         ;;
 316     esac
 317     ;;
 318   nios2-*-*)
 319     GOARCH=nios2
 320     ;;
 321   rs6000*-*-* | powerpc*-*-*)
 322     AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 323 #ifdef _ARCH_PPC64
 324 #error 64-bit
 325 #endif
 326 ])],
 327 [GOARCH=ppc],
 328     [
 329 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 330 #if defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
 331 #error 64be
 332 #endif
 333 ])],
 334 [GOARCH=ppc64le],
 335 [GOARCH=ppc64])])
 336     ;;
 337   riscv64-*-*)
 338     GOARCH=riscv64
 339     ;;
 340   s390*-*-*)
 341     AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 342 #if defined(__s390x__)
 343 #error 64-bit
 344 #endif
 345 ])],
 346 [GOARCH=s390],
 347 [GOARCH=s390x])
 348     ;;
 349   sh3eb*-*-* | sh4eb*-*-*)
 350     GOARCH=shbe
 351     ;;
 352   sh3*-*-* | sh4*-*-*)
 353     GOARCH=sh
 354     ;;
 355   sparc*-*-*)
 356     AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 357 #if defined(__sparcv9) || defined(__arch64__)
 358 #error 64-bit
 359 #endif
 360 ])],
 361 [GOARCH=sparc],
 362 [GOARCH=sparc64])
 363     ;;
 364 esac
 365 AC_SUBST(GOARCH)
 366 AC_SUBST(ALLGOARCH)
 367 AC_SUBST(ALLGOARCHFAMILY)
 368
 369 AM_CONDITIONAL(LIBGO_IS_X86, test "$GOARCH" = "386" -o "$GOARCH" = "amd64" -o "$GOARCH" = "amd64p32")
 370
 371 FUNCTION_DESCRIPTORS=false
 372 case ${host} in
 373   rs6000*-*-* | powerpc*-*-*)
 374     AC_COMPILE_IFELSE([AC_LANG_SOURCE([
 375 #if _CALL_ELF == 1
 376 #error descriptors
 377 #endif
 378 ])],
 379         [FUNCTION_DESCRIPTORS=false],
 380         [FUNCTION_DESCRIPTORS=true])
 381     ;;
 382 esac
 383 AC_SUBST(FUNCTION_DESCRIPTORS)
 384
 385 dnl Some files are only present when needed for specific architectures.
 386 GO_LIBCALL_OS_FILE=
 387 GO_LIBCALL_OS_ARCH_FILE=
 388 GO_SYSCALL_OS_FILE=
 389 GO_SYSCALL_OS_ARCH_FILE=
 390 if test -f "${srcdir}/go/syscall/libcall_${GOOS}.go"; then
 391   GO_LIBCALL_OS_FILE="go/syscall/libcall_${GOOS}.go"
 392 fi
 393 if test -f "${srcdir}/go/syscall/libcall_${GOOS}_${GOARCH}.go"; then
 394   GO_LIBCALL_OS_ARCH_FILE="go/syscall/libcall_${GOOS}_${GOARCH}.go"
 395 fi
 396 if test -f "${srcdir}/go/syscall/syscall_${GOOS}.go"; then
 397   GO_SYSCALL_OS_FILE="go/syscall/syscall_${GOOS}.go"
 398 fi
 399 if test -f "${srcdir}/go/syscall/syscall_${GOOS}_${GOARCH}.go"; then
 400   GO_SYSCALL_OS_ARCH_FILE="go/syscall/syscall_${GOOS}_${GOARCH}.go"
 401 fi
 402 AC_SUBST(GO_LIBCALL_OS_FILE)
 403 AC_SUBST(GO_LIBCALL_OS_ARCH_FILE)
 404 AC_SUBST(GO_SYSCALL_OS_FILE)
 405 AC_SUBST(GO_SYSCALL_OS_ARCH_FILE)
 406
 407 dnl Special flags used to generate sysinfo.go.
 408 OSCFLAGS="-D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
 409 case "$target" in
 410     mips-sgi-irix6.5*)
 411         # IRIX 6 needs _XOPEN_SOURCE=500 for the XPG5 version of struct
 412         # msghdr in <sys/socket.h>.
 413         OSCFLAGS="$OSCFLAGS -D_XOPEN_SOURCE=500"
 414         ;;
 415     *-*-solaris2.*)
 416         # Solaris 10+ needs this so struct msghdr gets the msg_control
 417         # etc. fields in <sys/socket.h> (_XPG4_2).  _XOPEN_SOURCE=600 as
 418         # above doesn't work with C99.
 419         OSCFLAGS="$OSCFLAGS -std=gnu99 -D_XOPEN_SOURCE=600 -D__EXTENSIONS__"
 420         ;;
 421 esac
 422 AC_SUBST(OSCFLAGS)
 423
 424 dnl Check if assembler supports disabling hardware capability support.
 425 GCC_CHECK_ASSEMBLER_HWCAP
 426
 427 dnl Use -fsplit-stack when compiling C code if available.
 428 AC_CACHE_CHECK([whether -fsplit-stack is supported],
 429 [libgo_cv_c_split_stack_supported],
 430 [CFLAGS_hold=$CFLAGS
 431 CFLAGS="$CFLAGS -fsplit-stack"
 432 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 433 [libgo_cv_c_split_stack_supported=yes],
 434 [libgo_cv_c_split_stack_supported=no])
 435 CFLAGS=$CFLAGS_hold])
 436
 437 dnl Make sure the linker permits -fsplit-stack.  Old versions of gold will
 438 dnl reject split-stack code calling non-split-stack code on targets
 439 dnl they don't support.
 440 AC_CACHE_CHECK([whether linker supports split/non-split linked together],
 441 [libgo_cv_c_linker_split_non_split],
 442 [cat > conftest1.c << EOF
 443 extern void f();
 444 int main() { f(); return 0; }
 445 EOF
 446 cat > conftest2.c << EOF
 447 void f() {}
 448 EOF
 449 $CC -c -fsplit-stack $CFLAGS $CPPFLAGS conftest1.c >/dev/null 2>&1
 450 $CC -c $CFLAGS $CPPFLAGS conftest2.c > /dev/null 2>&1
 451 if $CC -o conftest conftest1.$ac_objext conftest2.$ac_objext > /dev/null 2>&1; then
 452   libgo_cv_c_linker_split_non_split=yes
 453 else
 454   libgo_cv_c_linker_split_non_split=no
 455 fi
 456 rm -f conftest1.* conftest2.* conftest])
 457
 458 if test "$libgo_cv_c_split_stack_supported" = yes -a "$libgo_cv_c_linker_split_non_split" = yes; then
 459   SPLIT_STACK=-fsplit-stack
 460   AC_DEFINE(USING_SPLIT_STACK, 1,
 461                 [Define if the compiler supports -fsplit-stack])
 462 else
 463   SPLIT_STACK=
 464 fi
 465 AC_SUBST(SPLIT_STACK)
 466 AM_CONDITIONAL(USING_SPLIT_STACK,
 467         test "$libgo_cv_c_split_stack_supported" = yes -a "$libgo_cv_c_linker_split_non_split" = yes)
 468
 469 dnl If the compiler supports split-stack but the linker does not, then
 470 dnl we need to explicitly disable split-stack for Go.
 471 if test "$libgo_cv_c_split_stack_supported" = yes -a "$libgo_cv_c_linker_split_non_split" = no; then
 472   GO_SPLIT_STACK=-fno-split-stack
 473 else
 474   GO_SPLIT_STACK=
 475 fi
 476 AC_SUBST(GO_SPLIT_STACK)
 477
 478 dnl Check whether the linker does stack munging when calling from
 479 dnl split-stack into non-split-stack code.  We check this by looking
 480 dnl at the --help output.  FIXME: This is only half right: it's
 481 dnl possible for the linker to support this for some targets but not
 482 dnl others.
 483 dnl This is slightly different from the above check, which is whether
 484 dnl the linker permits the call at all.
 485 AC_CACHE_CHECK([whether linker supports split stack],
 486 [libgo_cv_c_linker_supports_split_stack],
 487 [libgo_cv_c_linker_supports_split_stack=no
 488 if $GOC -Wl,--help 2>/dev/null | grep split-stack-adjust-size >/dev/null 2>&1; then
 489   libgo_cv_c_linker_supports_split_stack=yes
 490 fi])
 491 if test "$libgo_cv_c_linker_supports_split_stack" = yes; then
 492   AC_DEFINE(LINKER_SUPPORTS_SPLIT_STACK, 1,
 493             [Define if the linker support split stack adjustments])
 494 fi
 495
 496 AC_CACHE_CHECK([whether compiler is llgo],
 497 [libgo_cv_c_goc_is_llgo],
 498 [libgo_cv_c_goc_is_llgo=no
 499 if $GOC -dumpversion 2>/dev/null | grep llgo >/dev/null 2>&1; then
 500   libgo_cv_c_goc_is_llgo=yes
 501 fi])
 502 AM_CONDITIONAL(GOC_IS_LLGO, test "$libgo_cv_c_goc_is_llgo" = yes)
 503
 504 dnl Test for the -lm library.
 505 MATH_LIBS=
 506 AC_CHECK_LIB([m], [sqrt], MATH_LIBS=-lm)
 507 AC_SUBST(MATH_LIBS)
 508
 509 dnl Test for -lsocket and -lnsl.  Copied from libjava/configure.ac.
 510 AC_CACHE_CHECK([for socket libraries], libgo_cv_lib_sockets,
 511   [libgo_cv_lib_sockets=
 512    libgo_check_both=no
 513    AC_CHECK_FUNC(connect, libgo_check_socket=no, libgo_check_socket=yes)
 514    if test "$libgo_check_socket" = "yes"; then
 515      unset ac_cv_func_connect
 516      AC_CHECK_LIB(socket, main, libgo_cv_lib_sockets="-lsocket",
 517                   libgo_check_both=yes)
 518    fi
 519    if test "$libgo_check_both" = "yes"; then
 520      libgo_old_libs=$LIBS
 521      LIBS="$LIBS -lsocket -lnsl"
 522      unset ac_cv_func_accept
 523      AC_CHECK_FUNC(accept,
 524                    [libgo_check_nsl=no
 525                     libgo_cv_lib_sockets="-lsocket -lnsl"])
 526      unset ac_cv_func_accept
 527      LIBS=$libgo_old_libs
 528    fi
 529    unset ac_cv_func_gethostbyname
 530    libgo_old_libs="$LIBS"
 531    AC_CHECK_FUNC(gethostbyname, ,
 532                  [AC_CHECK_LIB(nsl, main,
 533                         [libgo_cv_lib_sockets="$libgo_cv_lib_sockets -lnsl"])])
 534    unset ac_cv_func_gethostbyname
 535    AC_CHECK_FUNC(sendfile, ,
 536                  [AC_CHECK_LIB(sendfile, main,
 537                         [libgo_cv_lib_sockets="$libgo_cv_lib_sockets -lsendfile"])])
 538    LIBS=$libgo_old_libs
 539 ])
 540 NET_LIBS="$libgo_cv_lib_sockets"
 541 AC_SUBST(NET_LIBS)
 542
 543 dnl Test whether the compiler supports the -pthread option.
 544 AC_CACHE_CHECK([whether -pthread is supported],
 545 [libgo_cv_lib_pthread],
 546 [CFLAGS_hold=$CFLAGS
 547 CFLAGS="$CFLAGS -pthread -L../libatomic/.libs"
 548 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 549 [libgo_cv_lib_pthread=yes],
 550 [libgo_cv_lib_pthread=no])
 551 CFLAGS=$CFLAGS_hold])
 552 PTHREAD_CFLAGS=
 553 if test "$libgo_cv_lib_pthread" = yes; then
 554   # RISC-V apparently adds -latomic when using -pthread.
 555   PTHREAD_CFLAGS="-pthread -L../libatomic/.libs"
 556 fi
 557 AC_SUBST(PTHREAD_CFLAGS)
 558
 559 dnl Test for the -lpthread library.
 560 PTHREAD_LIBS=
 561 AC_CHECK_LIB([pthread], [pthread_create], PTHREAD_LIBS=-lpthread)
 562 AC_SUBST(PTHREAD_LIBS)
 563
 564 dnl Test if -lrt is required for sched_yield or nanosleep or clock_gettime.
 565 AC_SEARCH_LIBS([sched_yield], [rt])
 566 AC_SEARCH_LIBS([nanosleep], [rt])
 567 AC_SEARCH_LIBS([clock_gettime], [rt])
 568
 569 AC_C_BIGENDIAN
 570
 571 GCC_CHECK_UNWIND_GETIPINFO
 572
 573 AC_CHECK_HEADERS(port.h sched.h semaphore.h sys/file.h sys/mman.h syscall.h sys/epoll.h sys/event.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/ptrace.h linux/reboot.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h)
 574
 575 AC_CHECK_HEADERS([netinet/icmp6.h], [], [],
 576 [#include <netinet/in.h>
 577 ])
 578
 579 AC_CHECK_HEADERS([linux/filter.h linux/if_addr.h linux/if_ether.h linux/if_tun.h linux/netlink.h linux/rtnetlink.h], [], [],
 580 [#ifdef HAVE_SYS_SOCKET_H
 581 #include <sys/socket.h>
 582 #endif
 583 ])
 584
 585 AM_CONDITIONAL(HAVE_SYS_MMAN_H, test "$ac_cv_header_sys_mman_h" = yes)
 586
 587 AC_CHECK_FUNCS(strerror_r strsignal wait4 mincore setenv unsetenv dl_iterate_phdr memmem)
 588 AM_CONDITIONAL(HAVE_STRERROR_R, test "$ac_cv_func_strerror_r" = yes)
 589 AM_CONDITIONAL(HAVE_WAIT4, test "$ac_cv_func_wait4" = yes)
 590
 591 AC_CHECK_FUNCS(accept4 dup3 epoll_create1 faccessat fallocate fchmodat fchownat futimesat getxattr inotify_add_watch inotify_init inotify_init1 inotify_rm_watch listxattr mkdirat mknodat open64 openat pipe2 removexattr renameat setxattr sync_file_range splice syscall tee unlinkat unshare utimensat)
 592 AC_TYPE_OFF_T
 593 AC_CHECK_TYPES([loff_t])
 594
 595 LIBS_hold="$LIBS"
 596 LIBS="$LIBS -lm"
 597 AC_CHECK_FUNCS(cosl expl logl sinl tanl acosl asinl atanl atan2l expm1l ldexpl log10l log1pl)
 598 LIBS="$LIBS_hold"
 599
 600 CFLAGS_hold="$CFLAGS"
 601 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 602 LIBS_hold="$LIBS"
 603 LIBS="$LIBS $PTHREAD_LIBS"
 604 AC_CHECK_FUNCS(sem_timedwait)
 605 CFLAGS="$CFLAGS_hold"
 606 LIBS="$LIBS_hold"
 607
 608 LIBS_hold="$LIBS"
 609 LIBS="$LIBS $MATH_LIBS"
 610 AC_CHECK_FUNCS(matherr)
 611 LIBS="$LIBS_hold"
 612
 613 dnl For x86 we want to use the -minline-all-stringops option to avoid
 614 dnl forcing a stack split when calling memcpy and friends.
 615 AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],
 616 [libgo_cv_c_stringops],
 617 [CFLAGS_hold=$CFLAGS
 618 CFLAGS="$CFLAGS -minline-all-stringops"
 619 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 620 [libgo_cv_c_stringops=yes],
 621 [libgo_cv_c_stringops=no])
 622 CFLAGS=$CFLAGS_hold])
 623 STRINGOPS_FLAG=
 624 if test "$libgo_cv_c_stringops" = yes; then
 625   STRINGOPS_FLAG=-minline-all-stringops
 626 fi
 627 AC_SUBST(STRINGOPS_FLAG)
 628
 629 dnl For x86 we want to compile the math library with -mfancy-math-387
 630 dnl so that we can use the builtin instructions directly.
 631 AC_CACHE_CHECK([whether compiler supports -mfancy-math-387],
 632 [libgo_cv_c_fancymath],
 633 [CFLAGS_hold=$CFLAGS
 634 CFLAGS="$CFLAGS -mfancy-math-387"
 635 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 636 [libgo_cv_c_fancymath=yes],
 637 [libgo_cv_c_fancymath=no])
 638 CFLAGS=$CFLAGS_hold])
 639 MATH_FLAG=
 640 if test "$libgo_cv_c_fancymath" = yes; then
 641   MATH_FLAG="-mfancy-math-387"
 642 fi
 643 MATH_FLAG="${MATH_FLAG} -ffp-contract=off -fno-math-errno -fno-trapping-math"
 644 AC_SUBST(MATH_FLAG)
 645
 646 CFLAGS_hold=$CFLAGS
 647 CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE"
 648 AC_CHECK_TYPES([off64_t])
 649 CFLAGS=$CFLAGS_hold
 650
 651 dnl Work out the size of the epoll_events struct on GNU/Linux.
 652 AC_CACHE_CHECK([epoll_event size],
 653 [libgo_cv_c_epoll_event_size],
 654 [AC_COMPUTE_INT(libgo_cv_c_epoll_event_size,
 655 [sizeof (struct epoll_event)],
 656 [#include <sys/epoll.h>],
 657 [libgo_cv_c_epoll_event_size=0])])
 658 SIZEOF_STRUCT_EPOLL_EVENT=${libgo_cv_c_epoll_event_size}
 659 AC_SUBST(SIZEOF_STRUCT_EPOLL_EVENT)
 660
 661 dnl Work out the offset of the fd field in the epoll_events struct on
 662 dnl GNU/Linux.
 663 AC_CACHE_CHECK([epoll_event data.fd offset],
 664 [libgo_cv_c_epoll_event_fd_offset],
 665 [AC_COMPUTE_INT(libgo_cv_c_epoll_event_fd_offset,
 666 [offsetof (struct epoll_event, data.fd)],
 667 [#include <stddef.h>
 668 #include <sys/epoll.h>],
 669 [libgo_cv_c_epoll_event_fd_offset=0])])
 670 STRUCT_EPOLL_EVENT_FD_OFFSET=${libgo_cv_c_epoll_event_fd_offset}
 671 AC_SUBST(STRUCT_EPOLL_EVENT_FD_OFFSET)
 672
 673 dnl Check if <sys/stat.h> uses timespec_t for st_?tim members.  Introduced
 674 dnl in Solaris 11.4 for XPG7 compatibility.
 675 AC_EGREP_HEADER([timespec_t.*st_atim], [sys/stat.h],
 676                 [have_stat_timespec=yes], [have_stat_timespec=no])
 677 AM_CONDITIONAL(HAVE_STAT_TIMESPEC, test $have_stat_timespec = yes)
 678
 679 dnl See if struct exception is defined in <math.h>.
 680 AC_CHECK_TYPE([struct exception],
 681 [libgo_has_struct_exception=yes],
 682 [libgo_has_struct_exception=no],
 683 [#include <math.h>])
 684 if test "$libgo_has_struct_exception" = "yes"; then
 685   AC_DEFINE(HAVE_STRUCT_EXCEPTION, 1,
 686             [Define to 1 if <math.h> defines struct exception])
 687 fi
 688
 689 dnl See whether setcontext changes the value of TLS variables.
 690 AC_CACHE_CHECK([whether setcontext clobbers TLS variables],
 691 [libgo_cv_lib_setcontext_clobbers_tls],
 692 [CFLAGS_hold="$CFLAGS"
 693 CFLAGS="$PTHREAD_CFLAGS"
 694 LIBS_hold="$LIBS"
 695 LIBS="$LIBS $PTHREAD_LIBS"
 696 AC_CHECK_SIZEOF([void *])
 697 AS_VAR_ARITH([ptr_type_size], [$ac_cv_sizeof_void_p \* 8])
 698 AC_RUN_IFELSE(
 699   [AC_LANG_SOURCE([
 700 #include <pthread.h>
 701 #include <stdlib.h>
 702 #include <ucontext.h>
 703 #include <unistd.h>
 704
 705 __thread int tls;
 706
 707 static char stack[[10 * 1024 * 1024]];
 708 static ucontext_t c;
 709
 710 /* Called via makecontext/setcontext.  */
 711
 712 static void
 713 cfn (void)
 714 {
 715   exit (tls);
 716 }
 717
 718 /* Called via pthread_create.  */
 719
 720 static void *
 721 tfn (void *dummy)
 722 {
 723   /* The thread should still see this value after calling
 724      setcontext.  */
 725   tls = 0;
 726
 727   setcontext (&c);
 728
 729   /* The call to setcontext should not return.  */
 730   abort ();
 731 }
 732
 733 int
 734 main ()
 735 {
 736   pthread_t tid;
 737
 738   /* The thread should not see this value.  */
 739   tls = 1;
 740
 741   if (getcontext (&c) < 0)
 742     abort ();
 743
 744   c.uc_stack.ss_sp = stack;
 745 #ifdef MAKECONTEXT_STACK_TOP
 746   c.uc_stack.ss_sp += sizeof stack;
 747 #endif
 748   c.uc_stack.ss_flags = 0;
 749   c.uc_stack.ss_size = sizeof stack;
 750   c.uc_link = NULL;
 751   makecontext (&c, cfn, 0);
 752
 753   if (pthread_create (&tid, NULL, tfn, NULL) != 0)
 754     abort ();
 755
 756   if (pthread_join (tid, NULL) != 0)
 757     abort ();
 758
 759   /* The thread should have called exit.  */
 760   abort ();
 761 }
 762 ])],
 763 [libgo_cv_lib_setcontext_clobbers_tls=no],
 764 [libgo_cv_lib_setcontext_clobbers_tls=yes],
 765 [case "$target:$ptr_type_size" in
 766   i?86-*-solaris2.1[[01]]:64 | x86_64*-*-solaris2.1[[01]]:64)
 767     libgo_cv_lib_setcontext_clobbers_tls=yes ;;
 768   *)
 769     libgo_cv_lib_setcontext_clobbers_tls=no ;;
 770  esac
 771 ])
 772 CFLAGS="$CFLAGS_hold"
 773 LIBS="$LIBS_hold"
 774 ])
 775 if test "$libgo_cv_lib_setcontext_clobbers_tls" = "yes"; then
 776   AC_DEFINE(SETCONTEXT_CLOBBERS_TLS, 1,
 777             [Define if setcontext clobbers TLS variables])
 778 fi
 779
 780 AC_CACHE_CHECK([whether .eh_frame section should be read-only],
 781 libgo_cv_ro_eh_frame, [
 782 libgo_cv_ro_eh_frame=no
 783 echo 'extern void foo (void); void bar (void) { foo (); foo (); }' > conftest.c
 784 if $CC $CFLAGS -S -fpic -fexceptions -o conftest.s conftest.c > /dev/null 2>&1; then
 785   if grep '.section.*eh_frame.*"a"' conftest.s > /dev/null; then
 786     libgo_cv_ro_eh_frame=yes
 787   elif grep '.section.*eh_frame.*#alloc' conftest.c \
 788        | grep -v '#write' > /dev/null; then
 789     libgo_cv_ro_eh_frame=yes
 790   fi
 791 fi
 792 rm -f conftest.*
 793 ])
 794 if test "x$libgo_cv_ro_eh_frame" = xyes; then
 795   AC_DEFINE(EH_FRAME_FLAGS, "a",
 796             [Define to the flags needed for the .section .eh_frame directive.])
 797 else
 798   AC_DEFINE(EH_FRAME_FLAGS, "aw",
 799             [Define to the flags needed for the .section .eh_frame directive.])
 800 fi
 801
 802 AC_CACHE_CHECK([if compiler supports -Qunused-arguments],
 803 [libgo_cv_c_unused_arguments],
 804 [CFLAGS_hold=$CFLAGS
 805 CFLAGS="$CFLAGS -Qunused-arguments"
 806 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
 807 [libgo_cv_c_unused_arguments=yes],
 808 [libgo_cv_c_unused_arguments=no])
 809 CFLAGS=$CFLAGS_hold])
 810
 811 AC_CACHE_CHECK([if assembler supports GNU comdat group syntax],
 812 libgo_cv_as_comdat_gnu, [
 813 echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
 814 CFLAGS_hold=$CFLAGS
 815 if test "$libgo_cv_c_unused_arguments" = yes; then
 816   CFLAGS="$CFLAGS -Qunused-arguments"
 817 fi
 818 if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
 819   libgo_cv_as_comdat_gnu=yes
 820 else
 821   libgo_cv_as_comdat_gnu=no
 822 fi
 823 CFLAGS=$CFLAGS_hold
 824 ])
 825 if test "x$libgo_cv_as_comdat_gnu" = xyes; then
 826   AC_DEFINE(HAVE_AS_COMDAT_GAS, 1,
 827             [Define if your assembler supports GNU comdat group syntax.])
 828 fi
 829
 830 AC_CACHE_CHECK([assembler supports pc related relocs],
 831 libgo_cv_as_x86_pcrel, [
 832 libgo_cv_as_x86_pcrel=yes
 833 echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
 834 CFLAGS_hold=$CFLAGS
 835 if test "$libgo_cv_c_unused_arguments" = yes; then
 836   CFLAGS="$CFLAGS -Qunused-arguments"
 837 fi
 838 if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
 839     libgo_cv_as_x86_pcrel=no
 840 fi
 841 CFLAGS=$CFLAGS_hold
 842 ])
 843 if test "x$libgo_cv_as_x86_pcrel" = xyes; then
 844   AC_DEFINE(HAVE_AS_X86_PCREL, 1,
 845             [Define if your assembler supports PC relative relocs.])
 846 fi
 847
 848 AC_CACHE_CHECK([assembler supports unwind section type],
 849 libgo_cv_as_x86_64_unwind_section_type, [
 850 libgo_cv_as_x86_64_unwind_section_type=yes
 851 echo '.section .eh_frame,"a",@unwind' > conftest.s
 852 CFLAGS_hold=$CFLAGS
 853 if test "$libgo_cv_c_unused_arguments" = yes; then
 854   CFLAGS="$CFLAGS -Qunused-arguments"
 855 fi
 856 if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
 857     libgo_cv_as_x86_64_unwind_section_type=no
 858 fi
 859 CFLAGS=$CFLAGS_hold
 860 ])
 861 if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then
 862   AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
 863             [Define if your assembler supports unwind section type.])
 864 fi
 865
 866 AC_CACHE_CHECK([assembler supports AES instructions],
 867 libgo_cv_as_x86_aes, [
 868 libgo_cv_as_x86_aes=yes
 869 echo 'aesenc %xmm0, %xmm1' > conftest.s
 870 CFLAGS_hold=$CFLAGS
 871 if test "$libgo_cv_c_unused_arguments" = yes; then
 872   CFLAGS="$CFLAGS -Qunused-arguments"
 873 fi
 874 if $CC $CFLAGS -c conftest.s 2>&1 | grep -i error > /dev/null; then
 875     libgo_cv_as_x86_aes=no
 876 fi
 877 CFLAGS=$CFLAGS_hold
 878 ])
 879 if test "x$libgo_cv_as_x86_aes" = xyes; then
 880   AC_DEFINE(HAVE_AS_X86_AES, 1,
 881             [Define if your assembler supports AES instructions.])
 882 fi
 883
 884 dnl Test whether the linker supports the -static option.
 885 AC_CACHE_CHECK([whether -static is supported],
 886 [libgo_cv_ld_static],
 887 [LDFLAGS_hold=$LDFLAGS
 888 LDFLAGS="$LDFLAGS -static"
 889 AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
 890 [libgo_cv_ld_static=yes],
 891 [libgo_cv_ld_static=no])
 892 LDFLAGS=$LDFLAGS_hold])
 893 AM_CONDITIONAL(HAVE_STATIC_LINK, test "$libgo_cv_ld_static" = yes)
 894
 895 AC_CACHE_SAVE
 896
 897 if test ${multilib} = yes; then
 898   multilib_arg="--enable-multilib"
 899 else
 900   multilib_arg=
 901 fi
 902
 903 AC_CONFIG_FILES(Makefile testsuite/Makefile testsuite/libgo-test-support.exp)
 904
 905 AC_CONFIG_COMMANDS([default],
 906 [if test -n "$CONFIG_FILES"; then
 907    # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
 908    # that multilib installs will end up installed in the correct place.
 909    # The testsuite needs it for multilib-aware ABI baseline files.
 910    # To work around this not being passed down from config-ml.in ->
 911    # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
 912    # append it here.  Only modify Makefiles that have just been created.
 913    #
 914    # Also, get rid of this simulated-VPATH thing that automake does.
 915    cat > vpsed << \_EOF
 916 s!`test -f '$<' || echo '$(srcdir)/'`!!
 917 _EOF
 918    for i in $SUBDIRS; do
 919     case $CONFIG_FILES in
 920      *${i}/Makefile*)
 921        #echo "Adding MULTISUBDIR to $i/Makefile"
 922        sed -f vpsed $i/Makefile > tmp
 923        grep '^MULTISUBDIR =' Makefile >> tmp
 924        mv tmp $i/Makefile
 925        ;;
 926     esac
 927    done
 928    rm vpsed
 929  fi
 930 ],
 931 [
 932 # Variables needed in config.status (file generation) which aren't already
 933 # passed by autoconf.
 934 SUBDIRS="$SUBDIRS"
 935 ])
 936
 937 AC_OUTPUT