configure

   1 #!/bin/sh
   2
   3 usage () {
   4 cat <<EOF
   5 Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
   6
   7 To assign environment variables (e.g., CC, CFLAGS...), specify them as
   8 VAR=VALUE.  See below for descriptions of some of the useful variables.
   9
  10 Defaults for the options are specified in brackets.
  11
  12 Configuration:
  13   --srcdir=DIR            source directory [detected]
  14
  15 Installation directories:
  16   --prefix=PREFIX         main installation prefix [/usr/local/musl]
  17   --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
  18
  19 Fine tuning of the installation directories:
  20   --bindir=DIR            user executables [EPREFIX/bin]
  21   --libdir=DIR            library files for the linker [PREFIX/lib]
  22   --includedir=DIR        include files for the C compiler [PREFIX/include]
  23   --syslibdir=DIR         location for the dynamic linker [/lib]
  24
  25 System types:
  26   --target=TARGET         configure to run on target TARGET [detected]
  27   --host=HOST             same as --target
  28
  29 Optional features:
  30   --enable-optimize=...   optimize listed components for speed over size [auto]
  31   --enable-debug          build with debugging information [disabled]
  32   --enable-warnings       build with recommended warnings flags [disabled]
  33   --enable-visibility     use global visibility options to optimize PIC [auto]
  34   --enable-wrapper=...    build given musl toolchain wrapper [auto]
  35   --disable-shared        inhibit building shared library [enabled]
  36   --disable-static        inhibit building static library [enabled]
  37
  38 Some influential environment variables:
  39   CC                      C compiler command [detected]
  40   CFLAGS                  C compiler flags [-Os -pipe ...]
  41   CROSS_COMPILE           prefix for cross compiler and tools [none]
  42   LIBCC                   compiler runtime library [detected]
  43
  44 Use these variables to override the choices made by configure.
  45
  46 EOF
  47 exit 0
  48 }
  49
  50 # Helper functions
  51
  52 quote () {
  53 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  54 $1
  55 EOF
  56 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  57 }
  58 echo () { printf "%s\n" "$*" ; }
  59 fail () { echo "$*" ; exit 1 ; }
  60 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  61 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  62 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  63
  64 stripdir () {
  65 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  66 }
  67
  68 trycppif () {
  69 printf "checking preprocessor condition %s... " "$1"
  70 echo "typedef int x;" > "$tmpc"
  71 echo "#if $1" >> "$tmpc"
  72 echo "#error yes" >> "$tmpc"
  73 echo "#endif" >> "$tmpc"
  74 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  75 printf "false\n"
  76 return 1
  77 else
  78 printf "true\n"
  79 return 0
  80 fi
  81 }
  82
  83 tryflag () {
  84 printf "checking whether compiler accepts %s... " "$2"
  85 echo "typedef int x;" > "$tmpc"
  86 if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  87 printf "yes\n"
  88 eval "$1=\"\${$1} \$2\""
  89 eval "$1=\${$1# }"
  90 return 0
  91 else
  92 printf "no\n"
  93 return 1
  94 fi
  95 }
  96
  97 tryldflag () {
  98 printf "checking whether linker accepts %s... " "$2"
  99 echo "typedef int x;" > "$tmpc"
 100 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 101 printf "yes\n"
 102 eval "$1=\"\${$1} \$2\""
 103 eval "$1=\${$1# }"
 104 return 0
 105 else
 106 printf "no\n"
 107 return 1
 108 fi
 109 }
 110
 111
 112
 113 # Beginning of actual script
 114
 115 CFLAGS_C99FSE=
 116 CFLAGS_AUTO=
 117 CFLAGS_MEMOPS=
 118 CFLAGS_NOSSP=
 119 CFLAGS_TRY=
 120 LDFLAGS_AUTO=
 121 LDFLAGS_TRY=
 122 OPTIMIZE_GLOBS=
 123 srcdir=
 124 prefix=/usr/local/musl
 125 exec_prefix='$(prefix)'
 126 bindir='$(exec_prefix)/bin'
 127 libdir='$(prefix)/lib'
 128 includedir='$(prefix)/include'
 129 syslibdir='/lib'
 130 tools=
 131 tool_libs=
 132 target=
 133 optimize=auto
 134 debug=no
 135 warnings=no
 136 visibility=auto
 137 shared=auto
 138 static=yes
 139 wrapper=auto
 140 gcc_wrapper=no
 141 clang_wrapper=no
 142
 143 for arg ; do
 144 case "$arg" in
 145 --help) usage ;;
 146 --srcdir=*) srcdir=${arg#*=} ;;
 147 --prefix=*) prefix=${arg#*=} ;;
 148 --exec-prefix=*) exec_prefix=${arg#*=} ;;
 149 --bindir=*) bindir=${arg#*=} ;;
 150 --libdir=*) libdir=${arg#*=} ;;
 151 --includedir=*) includedir=${arg#*=} ;;
 152 --syslibdir=*) syslibdir=${arg#*=} ;;
 153 --enable-shared|--enable-shared=yes) shared=yes ;;
 154 --disable-shared|--enable-shared=no) shared=no ;;
 155 --enable-static|--enable-static=yes) static=yes ;;
 156 --disable-static|--enable-static=no) static=no ;;
 157 --enable-optimize) optimize=yes ;;
 158 --enable-optimize=*) optimize=${arg#*=} ;;
 159 --disable-optimize) optimize=no ;;
 160 --enable-debug|--enable-debug=yes) debug=yes ;;
 161 --disable-debug|--enable-debug=no) debug=no ;;
 162 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 163 --disable-warnings|--enable-warnings=no) warnings=no ;;
 164 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
 165 --disable-visibility|--enable-visibility=no) visibility=no ;;
 166 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
 167 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
 168 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
 169 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
 170 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
 171 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
 172 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 173 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 174 --host=*|--target=*) target=${arg#*=} ;;
 175 -* ) echo "$0: unknown option $arg" ;;
 176 CC=*) CC=${arg#*=} ;;
 177 CFLAGS=*) CFLAGS=${arg#*=} ;;
 178 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 179 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 180 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 181 LIBCC=*) LIBCC=${arg#*=} ;;
 182 *=*) ;;
 183 *) target=$arg ;;
 184 esac
 185 done
 186
 187 for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do
 188 stripdir $i
 189 done
 190
 191 #
 192 # Get the source dir for out-of-tree builds
 193 #
 194 if test -z "$srcdir" ; then
 195 srcdir="${0%/configure}"
 196 stripdir srcdir
 197 fi
 198 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
 199 abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
 200 test "$abs_srcdir" = "$abs_builddir" && srcdir=.
 201 test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
 202
 203 #
 204 # Get a temp filename we can use
 205 #
 206 i=0
 207 set -C
 208 while : ; do i=$(($i+1))
 209 tmpc="./conf$$-$PPID-$i.c"
 210 2>|/dev/null > "$tmpc" && break
 211 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 212 done
 213 set +C
 214 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 215
 216 #
 217 # Find a C compiler to use
 218 #
 219 printf "checking for C compiler... "
 220 trycc ${CROSS_COMPILE}gcc
 221 trycc ${CROSS_COMPILE}c99
 222 trycc ${CROSS_COMPILE}cc
 223 printf "%s\n" "$CC"
 224 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 225
 226 printf "checking whether C compiler works... "
 227 echo "typedef int x;" > "$tmpc"
 228 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
 229 printf "yes\n"
 230 else
 231 printf "no; compiler output follows:\n%s\n" "$output"
 232 exit 1
 233 fi
 234
 235 #
 236 # Figure out options to force errors on unknown flags.
 237 #
 238 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 239 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 240 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 241 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 242
 243 #
 244 # Need to know if the compiler is gcc or clang to decide which toolchain
 245 # wrappers to build.
 246 #
 247 printf "checking for C compiler family... "
 248 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
 249 cc_family=unknown
 250 if fnmatch '*gcc\ version*' "$cc_ver" ; then
 251 cc_family=gcc
 252 elif fnmatch '*clang\ version*' "$cc_ver" ; then
 253 cc_family=clang
 254 fi
 255 echo "$cc_family"
 256
 257 #
 258 # Figure out toolchain wrapper to build
 259 #
 260 if test "$wrapper" = auto -o "$wrapper" = detect ; then
 261 echo "#include <stdlib.h>" > "$tmpc"
 262 echo "#if ! __GLIBC__" >> "$tmpc"
 263 echo "#error no" >> "$tmpc"
 264 echo "#endif" >> "$tmpc"
 265 printf "checking for toolchain wrapper to build... "
 266 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 267 echo "none"
 268 elif test "$cc_family" = gcc ; then
 269 gcc_wrapper=yes
 270 echo "gcc"
 271 elif test "$cc_family" = clang ; then
 272 clang_wrapper=yes
 273 echo "clang"
 274 else
 275 echo "none"
 276 if test "$wrapper" = detect ; then
 277 fail "$0: could not find an appropriate toolchain wrapper"
 278 fi
 279 fi
 280 fi
 281
 282 if test "$gcc_wrapper" = yes ; then
 283 tools="$tools obj/musl-gcc"
 284 tool_libs="$tool_libs lib/musl-gcc.specs"
 285 fi
 286 if test "$clang_wrapper" = yes ; then
 287 tools="$tools obj/musl-clang obj/ld.musl-clang"
 288 fi
 289
 290 #
 291 # Find the target architecture
 292 #
 293 printf "checking target system type... "
 294 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 295 printf "%s\n" "$target"
 296
 297 #
 298 # Convert to just ARCH
 299 #
 300 case "$target" in
 301 # Catch these early to simplify matching for 32-bit archs
 302 mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
 303 arm*) ARCH=arm ;;
 304 aarch64*) ARCH=aarch64 ;;
 305 i?86*) ARCH=i386 ;;
 306 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 307 x86_64*) ARCH=x86_64 ;;
 308 mips*) ARCH=mips ;;
 309 microblaze*) ARCH=microblaze ;;
 310 or1k*) ARCH=or1k ;;
 311 powerpc*) ARCH=powerpc ;;
 312 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
 313 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 314 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 315 esac
 316
 317 #
 318 # Try to get a conforming C99 freestanding environment
 319 #
 320 tryflag CFLAGS_C99FSE -std=c99
 321 tryflag CFLAGS_C99FSE -nostdinc
 322 tryflag CFLAGS_C99FSE -ffreestanding \
 323 || tryflag CFLAGS_C99FSE -fno-builtin
 324 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 325 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 326 tryflag CFLAGS_C99FSE -frounding-math
 327
 328 #
 329 # We may use the may_alias attribute if __GNUC__ is defined, so
 330 # if the compiler defines __GNUC__ but does not provide it,
 331 # it must be defined away as part of the CFLAGS.
 332 #
 333 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 334 cat > "$tmpc" <<EOF
 335 typedef int
 336 #ifdef __GNUC__
 337 __attribute__((__may_alias__))
 338 #endif
 339 x;
 340 EOF
 341 if $CC $CFLAGS_C99FSE -I$srcdir/arch/$ARCH -I$srcdir/include $CPPFLAGS $CFLAGS \
 342   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 343 printf "no\n"
 344 else
 345 printf "yes\n"
 346 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 347 fi
 348
 349 #
 350 # The GNU toolchain defaults to assuming unmarked files need an
 351 # executable stack, potentially exposing vulnerabilities in programs
 352 # linked with such object files. Fix this.
 353 #
 354 tryflag CFLAGS_C99FSE -Wa,--noexecstack
 355
 356 #
 357 # Check for options to disable stack protector, which needs to be
 358 # disabled for a few early-bootstrap translation units. If not found,
 359 # this is not an error; we assume the toolchain does not do ssp.
 360 #
 361 tryflag CFLAGS_NOSSP -fno-stack-protector
 362
 363 #
 364 # Check for options that may be needed to prevent the compiler from
 365 # generating self-referential versions of memcpy,, memmove, memcmp,
 366 # and memset. Really, we should add a check to determine if this
 367 # option is sufficient, and if not, add a macro to cripple these
 368 # functions with volatile...
 369 #
 370 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 371
 372 #
 373 # Enable debugging if requessted.
 374 #
 375 test "$debug" = yes && CFLAGS_AUTO=-g
 376
 377 #
 378 # Preprocess asm files to add extra debugging information if debug is
 379 # enabled, our assembler supports the needed directives, and the
 380 # preprocessing script has been written for our architecture.
 381 #
 382 printf "checking whether we should preprocess assembly to add debugging information... "
 383 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
 384    test -f "tools/add-cfi.$ARCH.awk" &&
 385    printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
 386 then
 387   ADD_CFI=yes
 388 else
 389   ADD_CFI=no
 390 fi
 391 printf "%s\n" "$ADD_CFI"
 392
 393 #
 394 # Possibly add a -O option to CFLAGS and select modules to optimize with
 395 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 396 #
 397 printf "checking for optimization settings... "
 398 case "x$optimize" in
 399 xauto)
 400 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 401 printf "using provided CFLAGS\n" ;optimize=no
 402 else
 403 printf "using defaults\n" ; optimize=yes
 404 fi
 405 ;;
 406 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 407 xno|x) printf "disabled\n" ; optimize=no ;;
 408 *) printf "custom\n" ;;
 409 esac
 410
 411 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 412 test "$optimize" = yes && optimize="internal,malloc,string"
 413
 414 if fnmatch 'no|size' "$optimize" ; then :
 415 else
 416 printf "components to be optimized for speed:"
 417 while test "$optimize" ; do
 418 case "$optimize" in
 419 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 420 *) this=$optimize optimize=
 421 esac
 422 printf " $this"
 423 case "$this" in
 424 */*.c) ;;
 425 */*) this=$this*.c ;;
 426 *) this=$this/*.c ;;
 427 esac
 428 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 429 done
 430 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 431 printf "\n"
 432 fi
 433
 434 # Always try -pipe
 435 tryflag CFLAGS_AUTO -pipe
 436
 437 #
 438 # If debugging is disabled, omit frame pointer. Modern GCC does this
 439 # anyway on most archs even when debugging is enabled since the frame
 440 # pointer is no longer needed for debugging.
 441 #
 442 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 443 else
 444 tryflag CFLAGS_AUTO -fomit-frame-pointer
 445 fi
 446
 447 #
 448 # Modern GCC wants to put DWARF tables (used for debugging and
 449 # unwinding) in the loaded part of the program where they are
 450 # unstrippable. These options force them back to debug sections (and
 451 # cause them not to get generated at all if debugging is off).
 452 #
 453 tryflag CFLAGS_AUTO -fno-unwind-tables
 454 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 455
 456 #
 457 # Attempt to put each function and each data object in its own
 458 # section. This both allows additional size optimizations at link
 459 # time and works around a dangerous class of compiler/assembler bugs
 460 # whereby relative address expressions are constant-folded by the
 461 # assembler even when one or more of the symbols involved is
 462 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
 463 #
 464 tryflag CFLAGS_AUTO -ffunction-sections
 465 tryflag CFLAGS_AUTO -fdata-sections
 466
 467 #
 468 # On x86, make sure we don't have incompatible instruction set
 469 # extensions enabled by default. This is bad for making static binaries.
 470 # We cheat and use i486 rather than i386 because i386 really does not
 471 # work anyway (issues with atomic ops).
 472 # Some build environments pass -march and -mtune options via CC, so
 473 # check both CC and CFLAGS.
 474 #
 475 if test "$ARCH" = "i386" ; then
 476 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 477 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 478 fi
 479
 480 #
 481 # Even with -std=c99, gcc accepts some constructs which are constraint
 482 # violations. We want to treat these as errors regardless of whether
 483 # other purely stylistic warnings are enabled -- especially implicit
 484 # function declarations, which are a dangerous programming error.
 485 #
 486 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 487 tryflag CFLAGS_AUTO -Werror=implicit-int
 488 tryflag CFLAGS_AUTO -Werror=pointer-sign
 489 tryflag CFLAGS_AUTO -Werror=pointer-arith
 490
 491 if test "x$warnings" = xyes ; then
 492 tryflag CFLAGS_AUTO -Wall
 493 tryflag CFLAGS_AUTO -Wno-parentheses
 494 tryflag CFLAGS_AUTO -Wno-uninitialized
 495 tryflag CFLAGS_AUTO -Wno-missing-braces
 496 tryflag CFLAGS_AUTO -Wno-unused-value
 497 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 498 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 499 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 500 fi
 501
 502 if test "x$visibility" = xauto ; then
 503 # This test checks toolchain support for several things:
 504 # - the -include option
 505 # - the attributes/pragmas used in vis.h
 506 # - linking code that takes the address of protected symbols
 507 # - gcc 3.x bug that wrongly claims declarations mismatch
 508 printf "checking whether global visibility preinclude works... "
 509 cat > "$tmpc" <<EOF
 510 __attribute__((__visibility__("default")))
 511 extern struct a *const x;
 512 typedef struct a b;
 513 extern b *const x;
 514 b *const x;
 515 int (*fp)(void);
 516 int foo(void) { }
 517 int bar(void) { fp = foo; return foo(); }
 518 EOF
 519 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 520   -DSHARED -fPIC -I$srcdir/src/internal -include vis.h \
 521   -nostdlib -shared -Wl,-Bsymbolic-functions \
 522   -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 523 visibility=yes
 524 else
 525 visibility=no
 526 fi
 527 printf "%s\n" "$visibility"
 528 fi
 529
 530 if test "x$visibility" = xyes ; then
 531 CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
 532 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 533 fi
 534
 535 # Determine if the compiler produces position-independent code (PIC)
 536 # by default. If so, we don't need to compile separate object files
 537 # for libc.a and libc.so.
 538 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 539 pic_default=yes
 540 else
 541 pic_default=no
 542 fi
 543
 544 # Reduce space lost to padding for alignment purposes by sorting data
 545 # objects according to their alignment reqirements. This approximates
 546 # optimal packing.
 547 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 548 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 549
 550 # When linking shared library, drop dummy weak definitions that were
 551 # replaced by strong definitions from other translation units.
 552 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 553
 554 # Some patched GCC builds have these defaults messed up...
 555 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 556
 557 # Prevent linking if there are undefined symbols; if any exist,
 558 # libc.so will crash at runtime during relocation processing.
 559 # The common way this can happen is failure to link the compiler
 560 # runtime library; implementation error is also a possibility.
 561 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 562
 563 # Avoid exporting symbols from compiler runtime libraries. They
 564 # should be hidden anyway, but some toolchains including old gcc
 565 # versions built without shared library support and pcc are broken.
 566 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 567
 568 test "$shared" = "no" || {
 569 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 570 LDFLAGS_DUMMY=
 571 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
 572 test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
 573 printf "warning: disabling dynamic linking support\n"
 574 shared=no
 575 }
 576 }
 577
 578 # Find compiler runtime library
 579 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 580 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 581 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 582                  && tryldflag LIBCC "$try_libcc"
 583 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 584
 585 # Figure out arch variants for archs with variants
 586 SUBARCH=
 587 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 588
 589 if test "$ARCH" = "x86_64" ; then
 590 trycppif __ILP32__ "$t" && ARCH=x32
 591 fi
 592
 593 if test "$ARCH" = "arm" ; then
 594 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 595 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 596 fi
 597
 598 if test "$ARCH" = "aarch64" ; then
 599 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
 600 fi
 601
 602 if test "$ARCH" = "mips" ; then
 603 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 604 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 605 fi
 606
 607 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 608 && SUBARCH=${SUBARCH}el
 609
 610 if test "$ARCH" = "sh" ; then
 611 tryflag CFLAGS_AUTO -Wa,--isa=any
 612 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 613 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 614 # Some sh configurations are broken and replace double with float
 615 # rather than using softfloat when the fpu is present but only
 616 # supports single precision. Reject them.
 617 printf "checking whether compiler's double type is IEEE double... "
 618 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
 619 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 620 printf "yes\n"
 621 else
 622 printf "no\n"
 623 fail "$0: error: compiler's floating point configuration is unsupported"
 624 fi
 625 else
 626 SUBARCH=${SUBARCH}-nofpu
 627 fi
 628 if trycppif __SH_FDPIC__ "$t" ; then
 629 SUBARCH=${SUBARCH}-fdpic
 630 fi
 631 fi
 632
 633 test "$SUBARCH" \
 634 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 635
 636 case "$ARCH$SUBARCH" in
 637 arm) ASMSUBARCH=el ;;
 638 *) ASMSUBARCH=$SUBARCH ;;
 639 esac
 640
 641 #
 642 # Some archs (powerpc) have different possible long double formats
 643 # that the compiler can be configured for. The logic for whether this
 644 # is supported is in bits/float.h; in general, it is not. We need to
 645 # check for mismatches here or code in printf, strotd, and scanf will
 646 # be dangerously incorrect because it depends on (1) the macros being
 647 # correct, and (2) IEEE semantics.
 648 #
 649 printf "checking whether compiler's long double definition matches float.h... "
 650 echo '#include <float.h>' > "$tmpc"
 651 echo '#if LDBL_MANT_DIG == 53' >> "$tmpc"
 652 echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc"
 653 echo '#endif' >> "$tmpc"
 654 if $CC $CFLAGS_C99FSE -I$srcdir/arch/$ARCH -I$srcdir/include $CPPFLAGS $CFLAGS \
 655   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 656 printf "yes\n"
 657 else
 658 printf "no\n"
 659 fail "$0: error: unsupported long double type"
 660 fi
 661
 662 printf "creating config.mak... "
 663
 664 cmdline=$(quote "$0")
 665 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 666
 667 exec 3>&1 1>config.mak
 668
 669
 670 cat << EOF
 671 # This version of config.mak was generated by:
 672 # $cmdline
 673 # Any changes made here will be lost if configure is re-run
 674 ARCH = $ARCH
 675 SUBARCH = $SUBARCH
 676 ASMSUBARCH = $ASMSUBARCH
 677 srcdir = $srcdir
 678 prefix = $prefix
 679 exec_prefix = $exec_prefix
 680 bindir = $bindir
 681 libdir = $libdir
 682 includedir = $includedir
 683 syslibdir = $syslibdir
 684 CC = $CC
 685 CFLAGS = $CFLAGS
 686 CFLAGS_AUTO = $CFLAGS_AUTO
 687 CFLAGS_C99FSE = $CFLAGS_C99FSE
 688 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 689 CFLAGS_NOSSP = $CFLAGS_NOSSP
 690 CPPFLAGS = $CPPFLAGS
 691 LDFLAGS = $LDFLAGS
 692 LDFLAGS_AUTO = $LDFLAGS_AUTO
 693 CROSS_COMPILE = $CROSS_COMPILE
 694 LIBCC = $LIBCC
 695 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 696 ALL_TOOLS = $tools
 697 TOOL_LIBS = $tool_libs
 698 ADD_CFI = $ADD_CFI
 699 EOF
 700 test "x$static" = xno && echo "STATIC_LIBS ="
 701 test "x$shared" = xno && echo "SHARED_LIBS ="
 702 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
 703 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 704 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
 705 exec 1>&3 3>&-
 706
 707 test "$srcdir" = "." || ln -sf $srcdir/Makefile .
 708
 709 printf "done\n"