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   --build=BUILD           build system type; used only to infer cross-compiling
  29
  30 Optional features:
  31   --enable-optimize=...   optimize listed components for speed over size [auto]
  32   --enable-debug          build with debugging information [disabled]
  33   --enable-warnings       build with recommended warnings flags [disabled]
  34   --enable-visibility     use global visibility options to optimize PIC [no]
  35   --enable-wrapper=...    build given musl toolchain wrapper [auto]
  36   --disable-shared        inhibit building shared library [enabled]
  37   --disable-static        inhibit building static library [enabled]
  38
  39 Some influential environment variables:
  40   CC                      C compiler command [detected]
  41   CFLAGS                  C compiler flags [-Os -pipe ...]
  42   CROSS_COMPILE           prefix for cross compiler and tools [none]
  43   LIBCC                   compiler runtime library [detected]
  44
  45 Use these variables to override the choices made by configure.
  46
  47 EOF
  48 exit 0
  49 }
  50
  51 # Helper functions
  52
  53 quote () {
  54 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  55 $1
  56 EOF
  57 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  58 }
  59 echo () { printf "%s\n" "$*" ; }
  60 fail () { echo "$*" ; exit 1 ; }
  61 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  62 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  63 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  64
  65 stripdir () {
  66 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  67 }
  68
  69 trycppif () {
  70 printf "checking preprocessor condition %s... " "$1"
  71 echo "typedef int x;" > "$tmpc"
  72 echo "#if $1" >> "$tmpc"
  73 echo "#error yes" >> "$tmpc"
  74 echo "#endif" >> "$tmpc"
  75 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  76 printf "false\n"
  77 return 1
  78 else
  79 printf "true\n"
  80 return 0
  81 fi
  82 }
  83
  84 tryflag () {
  85 printf "checking whether compiler accepts %s... " "$2"
  86 echo "typedef int x;" > "$tmpc"
  87 if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  88 printf "yes\n"
  89 eval "$1=\"\${$1} \$2\""
  90 eval "$1=\${$1# }"
  91 return 0
  92 else
  93 printf "no\n"
  94 return 1
  95 fi
  96 }
  97
  98 tryldflag () {
  99 printf "checking whether linker accepts %s... " "$2"
 100 echo "typedef int x;" > "$tmpc"
 101 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 102 printf "yes\n"
 103 eval "$1=\"\${$1} \$2\""
 104 eval "$1=\${$1# }"
 105 return 0
 106 else
 107 printf "no\n"
 108 return 1
 109 fi
 110 }
 111
 112
 113
 114 # Beginning of actual script
 115
 116 CFLAGS_C99FSE=
 117 CFLAGS_AUTO=
 118 CFLAGS_MEMOPS=
 119 CFLAGS_NOSSP=
 120 CFLAGS_TRY=
 121 LDFLAGS_AUTO=
 122 LDFLAGS_TRY=
 123 OPTIMIZE_GLOBS=
 124 srcdir=
 125 prefix=/usr/local/musl
 126 exec_prefix='$(prefix)'
 127 bindir='$(exec_prefix)/bin'
 128 libdir='$(prefix)/lib'
 129 includedir='$(prefix)/include'
 130 syslibdir='/lib'
 131 tools=
 132 tool_libs=
 133 build=
 134 target=
 135 optimize=auto
 136 debug=no
 137 warnings=no
 138 visibility=no
 139 shared=auto
 140 static=yes
 141 wrapper=auto
 142 gcc_wrapper=no
 143 clang_wrapper=no
 144
 145 for arg ; do
 146 case "$arg" in
 147 --help|-h) usage ;;
 148 --srcdir=*) srcdir=${arg#*=} ;;
 149 --prefix=*) prefix=${arg#*=} ;;
 150 --exec-prefix=*) exec_prefix=${arg#*=} ;;
 151 --bindir=*) bindir=${arg#*=} ;;
 152 --libdir=*) libdir=${arg#*=} ;;
 153 --includedir=*) includedir=${arg#*=} ;;
 154 --syslibdir=*) syslibdir=${arg#*=} ;;
 155 --enable-shared|--enable-shared=yes) shared=yes ;;
 156 --disable-shared|--enable-shared=no) shared=no ;;
 157 --enable-static|--enable-static=yes) static=yes ;;
 158 --disable-static|--enable-static=no) static=no ;;
 159 --enable-optimize) optimize=yes ;;
 160 --enable-optimize=*) optimize=${arg#*=} ;;
 161 --disable-optimize) optimize=no ;;
 162 --enable-debug|--enable-debug=yes) debug=yes ;;
 163 --disable-debug|--enable-debug=no) debug=no ;;
 164 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 165 --disable-warnings|--enable-warnings=no) warnings=no ;;
 166 --enable-visibility=auto) visibility=auto ;;
 167 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
 168 --disable-visibility|--enable-visibility=no) visibility=no ;;
 169 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
 170 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
 171 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
 172 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
 173 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
 174 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
 175 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 176 --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
 177 --host=*|--target=*) target=${arg#*=} ;;
 178 --build=*) build=${arg#*=} ;;
 179 -* ) echo "$0: unknown option $arg" ;;
 180 CC=*) CC=${arg#*=} ;;
 181 CFLAGS=*) CFLAGS=${arg#*=} ;;
 182 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 183 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 184 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 185 LIBCC=*) LIBCC=${arg#*=} ;;
 186 *=*) ;;
 187 *) build=$arg ; target=$arg ;;
 188 esac
 189 done
 190
 191 for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do
 192 stripdir $i
 193 done
 194
 195 #
 196 # Get the source dir for out-of-tree builds
 197 #
 198 if test -z "$srcdir" ; then
 199 srcdir="${0%/configure}"
 200 stripdir srcdir
 201 fi
 202 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
 203 abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
 204 test "$abs_srcdir" = "$abs_builddir" && srcdir=.
 205 test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
 206
 207 #
 208 # Get a temp filename we can use
 209 #
 210 i=0
 211 set -C
 212 while : ; do i=$(($i+1))
 213 tmpc="./conf$$-$PPID-$i.c"
 214 2>|/dev/null > "$tmpc" && break
 215 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 216 done
 217 set +C
 218 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 219
 220 #
 221 # Check whether we are cross-compiling, and set a default
 222 # CROSS_COMPILE prefix if none was provided.
 223 #
 224 test "$target" && \
 225 test "$target" != "$build" && \
 226 test -z "$CROSS_COMPILE" && \
 227 CROSS_COMPILE="$target-"
 228
 229 #
 230 # Find a C compiler to use
 231 #
 232 printf "checking for C compiler... "
 233 trycc ${CROSS_COMPILE}gcc
 234 trycc ${CROSS_COMPILE}c99
 235 trycc ${CROSS_COMPILE}cc
 236 printf "%s\n" "$CC"
 237 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 238
 239 printf "checking whether C compiler works... "
 240 echo "typedef int x;" > "$tmpc"
 241 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
 242 printf "yes\n"
 243 else
 244 printf "no; compiler output follows:\n%s\n" "$output"
 245 exit 1
 246 fi
 247
 248 #
 249 # Figure out options to force errors on unknown flags.
 250 #
 251 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 252 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 253 tryflag   CFLAGS_TRY  -Werror=ignored-optimization-argument
 254 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 255 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 256
 257 #
 258 # Need to know if the compiler is gcc or clang to decide which toolchain
 259 # wrappers to build.
 260 #
 261 printf "checking for C compiler family... "
 262 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
 263 cc_family=unknown
 264 if fnmatch '*gcc\ version*' "$cc_ver" ; then
 265 cc_family=gcc
 266 elif fnmatch '*clang\ version*' "$cc_ver" ; then
 267 cc_family=clang
 268 fi
 269 echo "$cc_family"
 270
 271 #
 272 # Figure out toolchain wrapper to build
 273 #
 274 if test "$wrapper" = auto -o "$wrapper" = detect ; then
 275 echo "#include <stdlib.h>" > "$tmpc"
 276 echo "#if ! __GLIBC__" >> "$tmpc"
 277 echo "#error no" >> "$tmpc"
 278 echo "#endif" >> "$tmpc"
 279 printf "checking for toolchain wrapper to build... "
 280 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 281 echo "none"
 282 elif test "$cc_family" = gcc ; then
 283 gcc_wrapper=yes
 284 echo "gcc"
 285 elif test "$cc_family" = clang ; then
 286 clang_wrapper=yes
 287 echo "clang"
 288 else
 289 echo "none"
 290 if test "$wrapper" = detect ; then
 291 fail "$0: could not find an appropriate toolchain wrapper"
 292 fi
 293 fi
 294 fi
 295
 296 if test "$gcc_wrapper" = yes ; then
 297 tools="$tools obj/musl-gcc"
 298 tool_libs="$tool_libs lib/musl-gcc.specs"
 299 fi
 300 if test "$clang_wrapper" = yes ; then
 301 tools="$tools obj/musl-clang obj/ld.musl-clang"
 302 fi
 303
 304 #
 305 # Find the target architecture
 306 #
 307 printf "checking target system type... "
 308 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 309 printf "%s\n" "$target"
 310
 311 #
 312 # Convert to just ARCH
 313 #
 314 case "$target" in
 315 # Catch these early to simplify matching for 32-bit archs
 316 arm*) ARCH=arm ;;
 317 aarch64*) ARCH=aarch64 ;;
 318 i?86-nt32*) ARCH=nt32 ;;
 319 i?86*) ARCH=i386 ;;
 320 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 321 x86_64-nt64*) ARCH=nt64 ;;
 322 x86_64*) ARCH=x86_64 ;;
 323 m68k*) ARCH=m68k ;;
 324 mips64*|mipsisa64*) ARCH=mips64 ;;
 325 mips*) ARCH=mips ;;
 326 microblaze*) ARCH=microblaze ;;
 327 or1k*) ARCH=or1k ;;
 328 powerpc64*) ARCH=powerpc64 ;;
 329 powerpc*) ARCH=powerpc ;;
 330 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
 331 s390x*) ARCH=s390x ;;
 332 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 333 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 334 esac
 335
 336 #
 337 # Try to get a conforming C99 freestanding environment
 338 #
 339 tryflag CFLAGS_C99FSE -std=c99
 340 tryflag CFLAGS_C99FSE -nostdinc
 341 tryflag CFLAGS_C99FSE -ffreestanding \
 342 || tryflag CFLAGS_C99FSE -fno-builtin
 343 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 344 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 345 tryflag CFLAGS_C99FSE -frounding-math
 346
 347 #
 348 # We may use the may_alias attribute if __GNUC__ is defined, so
 349 # if the compiler defines __GNUC__ but does not provide it,
 350 # it must be defined away as part of the CFLAGS.
 351 #
 352 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 353 cat > "$tmpc" <<EOF
 354 typedef int
 355 #ifdef __GNUC__
 356 __attribute__((__may_alias__))
 357 #endif
 358 x;
 359 EOF
 360 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 361   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 362 printf "no\n"
 363 else
 364 printf "yes\n"
 365 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 366 fi
 367
 368 #
 369 # The GNU toolchain defaults to assuming unmarked files need an
 370 # executable stack, potentially exposing vulnerabilities in programs
 371 # linked with such object files. Fix this.
 372 #
 373 tryflag CFLAGS_C99FSE -Wa,--noexecstack
 374
 375 #
 376 # Check for options to disable stack protector, which needs to be
 377 # disabled for a few early-bootstrap translation units. If not found,
 378 # this is not an error; we assume the toolchain does not do ssp.
 379 #
 380 tryflag CFLAGS_NOSSP -fno-stack-protector
 381
 382 #
 383 # Check for options that may be needed to prevent the compiler from
 384 # generating self-referential versions of memcpy,, memmove, memcmp,
 385 # and memset. Really, we should add a check to determine if this
 386 # option is sufficient, and if not, add a macro to cripple these
 387 # functions with volatile...
 388 #
 389 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 390
 391 #
 392 # Enable debugging if requessted.
 393 #
 394 test "$debug" = yes && CFLAGS_AUTO=-g
 395
 396 #
 397 # Preprocess asm files to add extra debugging information if debug is
 398 # enabled, our assembler supports the needed directives, and the
 399 # preprocessing script has been written for our architecture.
 400 #
 401 printf "checking whether we should preprocess assembly to add debugging information... "
 402 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
 403    test -f "tools/add-cfi.$ARCH.awk" &&
 404    printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
 405 then
 406   ADD_CFI=yes
 407 else
 408   ADD_CFI=no
 409 fi
 410 printf "%s\n" "$ADD_CFI"
 411
 412 #
 413 # Possibly add a -O option to CFLAGS and select modules to optimize with
 414 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 415 #
 416 printf "checking for optimization settings... "
 417 case "x$optimize" in
 418 xauto)
 419 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 420 printf "using provided CFLAGS\n" ;optimize=no
 421 else
 422 printf "using defaults\n" ; optimize=yes
 423 fi
 424 ;;
 425 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 426 xno|x) printf "disabled\n" ; optimize=no ;;
 427 *) printf "custom\n" ;;
 428 esac
 429
 430 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 431 test "$optimize" = yes && optimize="internal,malloc,string"
 432
 433 if fnmatch 'no|size' "$optimize" ; then :
 434 else
 435 printf "components to be optimized for speed:"
 436 while test "$optimize" ; do
 437 case "$optimize" in
 438 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 439 *) this=$optimize optimize=
 440 esac
 441 printf " $this"
 442 case "$this" in
 443 */*.c) ;;
 444 */*) this=$this*.c ;;
 445 *) this=$this/*.c ;;
 446 esac
 447 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 448 done
 449 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 450 printf "\n"
 451 fi
 452
 453 # Always try -pipe
 454 tryflag CFLAGS_AUTO -pipe
 455
 456 #
 457 # If debugging is disabled, omit frame pointer. Modern GCC does this
 458 # anyway on most archs even when debugging is enabled since the frame
 459 # pointer is no longer needed for debugging.
 460 #
 461 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 462 else
 463 tryflag CFLAGS_AUTO -fomit-frame-pointer
 464 fi
 465
 466 #
 467 # Modern GCC wants to put DWARF tables (used for debugging and
 468 # unwinding) in the loaded part of the program where they are
 469 # unstrippable. These options force them back to debug sections (and
 470 # cause them not to get generated at all if debugging is off).
 471 #
 472 tryflag CFLAGS_AUTO -fno-unwind-tables
 473 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 474
 475 #
 476 # Attempt to put each function and each data object in its own
 477 # section. This both allows additional size optimizations at link
 478 # time and works around a dangerous class of compiler/assembler bugs
 479 # whereby relative address expressions are constant-folded by the
 480 # assembler even when one or more of the symbols involved is
 481 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
 482 #
 483 tryflag CFLAGS_AUTO -ffunction-sections
 484 tryflag CFLAGS_AUTO -fdata-sections
 485
 486 #
 487 # On x86, make sure we don't have incompatible instruction set
 488 # extensions enabled by default. This is bad for making static binaries.
 489 # We cheat and use i486 rather than i386 because i386 really does not
 490 # work anyway (issues with atomic ops).
 491 # Some build environments pass -march and -mtune options via CC, so
 492 # check both CC and CFLAGS.
 493 #
 494 if test "$ARCH" = "i386" ; then
 495 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 496 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 497 fi
 498
 499 #
 500 # Even with -std=c99, gcc accepts some constructs which are constraint
 501 # violations. We want to treat these as errors regardless of whether
 502 # other purely stylistic warnings are enabled -- especially implicit
 503 # function declarations, which are a dangerous programming error.
 504 #
 505 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 506 tryflag CFLAGS_AUTO -Werror=implicit-int
 507 tryflag CFLAGS_AUTO -Werror=pointer-sign
 508 tryflag CFLAGS_AUTO -Werror=pointer-arith
 509
 510 #
 511 # GCC ignores unused arguements by default, but Clang needs this extra
 512 # parameter to stop printing warnings about LDFLAGS passed during
 513 # compiling stage and CFLAGS passed during linking stage.
 514 #
 515 tryflag CFLAGS_AUTO -Qunused-arguments
 516
 517 if test "x$warnings" = xyes ; then
 518 tryflag CFLAGS_AUTO -Wall
 519 tryflag CFLAGS_AUTO -Wno-parentheses
 520 tryflag CFLAGS_AUTO -Wno-uninitialized
 521 tryflag CFLAGS_AUTO -Wno-missing-braces
 522 tryflag CFLAGS_AUTO -Wno-unused-value
 523 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 524 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 525 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 526 fi
 527
 528 if test "x$visibility" = xauto ; then
 529 # This test checks toolchain support for several things:
 530 # - the -include option
 531 # - the attributes/pragmas used in vis.h
 532 # - linking code that takes the address of protected symbols
 533 # - gcc 3.x bug that wrongly claims declarations mismatch
 534 printf "checking whether global visibility preinclude works... "
 535 cat > "$tmpc" <<EOF
 536 __attribute__((__visibility__("default")))
 537 extern struct a *const x;
 538 typedef struct a b;
 539 extern b *const x;
 540 b *const x;
 541 int (*fp)(void);
 542 int foo(void) { }
 543 int bar(void) { fp = foo; return foo(); }
 544 EOF
 545 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 546   -DSHARED -fPIC -I$srcdir/src/internal -include vis.h \
 547   -nostdlib -shared -Wl,-Bsymbolic-functions \
 548   -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 549 visibility=yes
 550 else
 551 visibility=no
 552 fi
 553 printf "%s\n" "$visibility"
 554 fi
 555
 556 if test "x$visibility" = xyes ; then
 557 CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
 558 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 559 fi
 560
 561 # Determine if the compiler produces position-independent code (PIC)
 562 # by default. If so, we don't need to compile separate object files
 563 # for libc.a and libc.so.
 564 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 565 pic_default=yes
 566 else
 567 pic_default=no
 568 fi
 569
 570 # Reduce space lost to padding for alignment purposes by sorting data
 571 # objects according to their alignment reqirements. This approximates
 572 # optimal packing.
 573 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 574 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 575
 576 # When linking shared library, drop dummy weak definitions that were
 577 # replaced by strong definitions from other translation units.
 578 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 579
 580 # Some patched GCC builds have these defaults messed up...
 581 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 582
 583 # Prevent linking if there are undefined symbols; if any exist,
 584 # libc.so will crash at runtime during relocation processing.
 585 # The common way this can happen is failure to link the compiler
 586 # runtime library; implementation error is also a possibility.
 587 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 588
 589 # Avoid exporting symbols from compiler runtime libraries. They
 590 # should be hidden anyway, but some toolchains including old gcc
 591 # versions built without shared library support and pcc are broken.
 592 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 593
 594 # Public data symbols must be interposable to allow for copy
 595 # relocations, but otherwise we want to bind symbols at libc link
 596 # time to eliminate startup relocations and PLT overhead. Use
 597 # --dynamic-list rather than -Bsymbolic-functions for greater
 598 # control over what symbols are left unbound.
 599 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
 600
 601 # Find compiler runtime library
 602 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 603 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 604 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
 605                  && tryldflag LIBCC "$try_libcc"
 606 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 607                  && tryldflag LIBCC "$try_libcc"
 608 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 609
 610 # Figure out arch variants for archs with variants
 611 SUBARCH=
 612 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 613
 614 if test "$ARCH" = "x86_64" ; then
 615 trycppif __ILP32__ "$t" && ARCH=x32
 616 fi
 617
 618 if test "$ARCH" = "arm" ; then
 619 if trycppif __thumb2__ "$t" ; then
 620 tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
 621 tryflag CFLAGS_AUTO -Wa,-mthumb
 622 fi
 623 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 624 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 625 # Versions of clang up until at least 3.8 have the wrong constraint codes
 626 # for floating point operands to inline asm. Detect this so the affected
 627 # source files can just disable the asm.
 628 if test "$cc_family" = clang ; then
 629 printf "checking whether clang's vfp asm constraints work... "
 630 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
 631 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 632 printf "yes\n"
 633 else
 634 printf "no\n"
 635 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
 636 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 637 fi
 638 fi
 639 fi
 640
 641 if test "$ARCH" = "aarch64" ; then
 642 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
 643 fi
 644
 645 if test "$ARCH" = "m68k" ; then
 646 if trycppif "__HAVE_68881__" ; then : ;
 647 elif trycppif "__mcffpu__" ; then SUBARCH="-fp64"
 648 else SUBARCH="-sf"
 649 fi
 650 fi
 651
 652 if test "$ARCH" = "mips" ; then
 653 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 654 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 655 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 656 fi
 657
 658 if test "$ARCH" = "mips64" ; then
 659 trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
 660 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 661 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 662 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 663 fi
 664
 665 if test "$ARCH" = "powerpc" ; then
 666 trycppif "__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \
 667   "$0: error: compiler's floating point configuration is unsupported"
 668 trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
 669 fi
 670
 671 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 672 && SUBARCH=${SUBARCH}el
 673
 674 if test "$ARCH" = "powerpc64" ; then
 675 trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
 676 trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
 677 trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
 678 fi
 679
 680 if test "$ARCH" = "sh" ; then
 681 tryflag CFLAGS_AUTO -Wa,--isa=any
 682 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 683 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 684 # Some sh configurations are broken and replace double with float
 685 # rather than using softfloat when the fpu is present but only
 686 # supports single precision. Reject them.
 687 printf "checking whether compiler's double type is IEEE double... "
 688 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
 689 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 690 printf "yes\n"
 691 else
 692 printf "no\n"
 693 fail "$0: error: compiler's floating point configuration is unsupported"
 694 fi
 695 else
 696 SUBARCH=${SUBARCH}-nofpu
 697 fi
 698 if trycppif __SH_FDPIC__ "$t" ; then
 699 SUBARCH=${SUBARCH}-fdpic
 700 fi
 701 fi
 702
 703 test "$SUBARCH" \
 704 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 705
 706 case "$ARCH$SUBARCH" in
 707 arm) ASMSUBARCH=el ;;
 708 *) ASMSUBARCH=$SUBARCH ;;
 709 esac
 710
 711 #
 712 # Some archs (powerpc) have different possible long double formats
 713 # that the compiler can be configured for. The logic for whether this
 714 # is supported is in bits/float.h; in general, it is not. We need to
 715 # check for mismatches here or code in printf, strotd, and scanf will
 716 # be dangerously incorrect because it depends on (1) the macros being
 717 # correct, and (2) IEEE semantics.
 718 #
 719 printf "checking whether compiler's long double definition matches float.h... "
 720 echo '#include <float.h>' > "$tmpc"
 721 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
 722 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
 723 if $CC $CFLAGS_C99FSE \
 724   -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
 725   $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 726 printf "yes\n"
 727 else
 728 printf "no\n"
 729 fail "$0: error: unsupported long double type"
 730 fi
 731
 732 #
 733 # Some build systems globally pass in broken CFLAGS like -ffast-math
 734 # for all packages. On recent GCC we can detect this and error out
 735 # early rather than producing a seriously-broken math library.
 736 #
 737 if trycppif "__FAST_MATH__" \
 738   "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 739 fail "$0: error: compiler has broken floating point; check CFLAGS"
 740 fi
 741
 742 printf "creating config.mak... "
 743
 744 cmdline=$(quote "$0")
 745 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 746
 747 exec 3>&1 1>config.mak
 748
 749
 750 cat << EOF
 751 # This version of config.mak was generated by:
 752 # $cmdline
 753 # Any changes made here will be lost if configure is re-run
 754 ARCH = $ARCH
 755 SUBARCH = $SUBARCH
 756 ASMSUBARCH = $ASMSUBARCH
 757 srcdir = $srcdir
 758 prefix = $prefix
 759 exec_prefix = $exec_prefix
 760 bindir = $bindir
 761 libdir = $libdir
 762 includedir = $includedir
 763 syslibdir = $syslibdir
 764 CC = $CC
 765 CFLAGS = $CFLAGS
 766 CFLAGS_AUTO = $CFLAGS_AUTO
 767 CFLAGS_C99FSE = $CFLAGS_C99FSE
 768 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 769 CFLAGS_NOSSP = $CFLAGS_NOSSP
 770 CPPFLAGS = $CPPFLAGS
 771 LDFLAGS = $LDFLAGS
 772 LDFLAGS_AUTO = $LDFLAGS_AUTO
 773 CROSS_COMPILE = $CROSS_COMPILE
 774 LIBCC = $LIBCC
 775 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 776 ALL_TOOLS = $tools
 777 TOOL_LIBS = $tool_libs
 778 ADD_CFI = $ADD_CFI
 779 EOF
 780 test "x$static" = xno && echo "STATIC_LIBS ="
 781 test "x$shared" = xno && echo "SHARED_LIBS ="
 782 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
 783 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 784 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
 785 exec 1>&3 3>&-
 786
 787 test "$srcdir" = "." || ln -sf $srcdir/Makefile .
 788
 789 printf "done\n"