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-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='$(prefix)/include'
 129 syslibdir='/lib'
 130 tools=
 131 tool_libs=
 132 build=
 133 target=
 134 optimize=auto
 135 debug=no
 136 warnings=no
 137 shared=auto
 138 static=yes
 139 wrapper=auto
 140 gcc_wrapper=no
 141 clang_wrapper=no
 142
 143 for arg ; do
 144 case "$arg" in
 145 --help|-h) 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-wrapper|--enable-wrapper=yes) wrapper=detect ;;
 165 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
 166 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
 167 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
 168 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
 169 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
 170 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 171 --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
 172 --host=*|--target=*) target=${arg#*=} ;;
 173 --build=*) build=${arg#*=} ;;
 174 -* ) echo "$0: unknown option $arg" ;;
 175 AR=*) AR=${arg#*=} ;;
 176 RANLIB=*) RANLIB=${arg#*=} ;;
 177 CC=*) CC=${arg#*=} ;;
 178 CFLAGS=*) CFLAGS=${arg#*=} ;;
 179 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 180 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 181 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 182 LIBCC=*) LIBCC=${arg#*=} ;;
 183 *=*) ;;
 184 *) build=$arg ; target=$arg ;;
 185 esac
 186 done
 187
 188 for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do
 189 stripdir $i
 190 done
 191
 192 #
 193 # Get the source dir for out-of-tree builds
 194 #
 195 if test -z "$srcdir" ; then
 196 srcdir="${0%/configure}"
 197 stripdir srcdir
 198 fi
 199 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
 200 abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
 201 test "$abs_srcdir" = "$abs_builddir" && srcdir=.
 202 test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
 203
 204 #
 205 # Get a temp filename we can use
 206 #
 207 i=0
 208 set -C
 209 while : ; do i=$(($i+1))
 210 tmpc="./conf$$-$PPID-$i.c"
 211 2>|/dev/null > "$tmpc" && break
 212 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 213 done
 214 set +C
 215 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 216
 217 #
 218 # Check whether we are cross-compiling, and set a default
 219 # CROSS_COMPILE prefix if none was provided.
 220 #
 221 test "$target" && \
 222 test "$target" != "$build" && \
 223 test -z "$CROSS_COMPILE" && \
 224 CROSS_COMPILE="$target-"
 225
 226 #
 227 # Find a C compiler to use
 228 #
 229 printf "checking for C compiler... "
 230 trycc ${CROSS_COMPILE}gcc
 231 trycc ${CROSS_COMPILE}c99
 232 trycc ${CROSS_COMPILE}cc
 233 printf "%s\n" "$CC"
 234 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 235
 236 printf "checking whether C compiler works... "
 237 echo "typedef int x;" > "$tmpc"
 238 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
 239 printf "yes\n"
 240 else
 241 printf "no; compiler output follows:\n%s\n" "$output"
 242 exit 1
 243 fi
 244
 245 #
 246 # Figure out options to force errors on unknown flags.
 247 #
 248 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 249 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 250 tryflag   CFLAGS_TRY  -Werror=ignored-optimization-argument
 251 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 252 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 253
 254 #
 255 # Need to know if the compiler is gcc or clang to decide which toolchain
 256 # wrappers to build.
 257 #
 258 printf "checking for C compiler family... "
 259 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
 260 cc_family=unknown
 261 if fnmatch '*gcc\ version*' "$cc_ver" ; then
 262 cc_family=gcc
 263 elif fnmatch '*clang\ version*' "$cc_ver" ; then
 264 cc_family=clang
 265 fi
 266 echo "$cc_family"
 267
 268 #
 269 # Figure out toolchain wrapper to build
 270 #
 271 if test "$wrapper" = auto -o "$wrapper" = detect ; then
 272 echo "#include <stdlib.h>" > "$tmpc"
 273 echo "#if ! __GLIBC__" >> "$tmpc"
 274 echo "#error no" >> "$tmpc"
 275 echo "#endif" >> "$tmpc"
 276 printf "checking for toolchain wrapper to build... "
 277 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 278 echo "none"
 279 elif test "$cc_family" = gcc ; then
 280 gcc_wrapper=yes
 281 echo "gcc"
 282 elif test "$cc_family" = clang ; then
 283 clang_wrapper=yes
 284 echo "clang"
 285 else
 286 echo "none"
 287 if test "$wrapper" = detect ; then
 288 fail "$0: could not find an appropriate toolchain wrapper"
 289 fi
 290 fi
 291 fi
 292
 293 if test "$gcc_wrapper" = yes ; then
 294 tools="$tools obj/musl-gcc"
 295 tool_libs="$tool_libs lib/musl-gcc.specs"
 296 fi
 297 if test "$clang_wrapper" = yes ; then
 298 tools="$tools obj/musl-clang obj/ld.musl-clang"
 299 fi
 300
 301 #
 302 # Find the target architecture
 303 #
 304 printf "checking target system type... "
 305 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 306 printf "%s\n" "$target"
 307
 308 #
 309 # Convert to just ARCH
 310 #
 311 case "$target" in
 312 # Catch these early to simplify matching for 32-bit archs
 313 arm*) ARCH=arm ;;
 314 aarch64*) ARCH=aarch64 ;;
 315 i?86-nt32*) ARCH=nt32 ;;
 316 i?86*) ARCH=i386 ;;
 317 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 318 x86_64-nt64*) ARCH=nt64 ;;
 319 x86_64*) ARCH=x86_64 ;;
 320 m68k*) ARCH=m68k ;;
 321 mips64*|mipsisa64*) ARCH=mips64 ;;
 322 mips*) ARCH=mips ;;
 323 microblaze*) ARCH=microblaze ;;
 324 or1k*) ARCH=or1k ;;
 325 powerpc64*|ppc64*) ARCH=powerpc64 ;;
 326 powerpc*|ppc*) ARCH=powerpc ;;
 327 riscv64*) ARCH=riscv64 ;;
 328 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
 329 s390x*) ARCH=s390x ;;
 330 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 331 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 332 esac
 333
 334 #
 335 # Try to get a conforming C99 freestanding environment
 336 #
 337 tryflag CFLAGS_C99FSE -std=c99
 338 tryflag CFLAGS_C99FSE -nostdinc
 339 tryflag CFLAGS_C99FSE -ffreestanding \
 340 || tryflag CFLAGS_C99FSE -fno-builtin
 341 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 342 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 343 tryflag CFLAGS_C99FSE -frounding-math
 344
 345 #
 346 # We may use the may_alias attribute if __GNUC__ is defined, so
 347 # if the compiler defines __GNUC__ but does not provide it,
 348 # it must be defined away as part of the CFLAGS.
 349 #
 350 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 351 cat > "$tmpc" <<EOF
 352 typedef int
 353 #ifdef __GNUC__
 354 __attribute__((__may_alias__))
 355 #endif
 356 x;
 357 EOF
 358 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 359   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 360 printf "no\n"
 361 else
 362 printf "yes\n"
 363 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 364 fi
 365
 366 #
 367 # The GNU toolchain defaults to assuming unmarked files need an
 368 # executable stack, potentially exposing vulnerabilities in programs
 369 # linked with such object files. Fix this.
 370 #
 371 tryflag CFLAGS_C99FSE -Wa,--noexecstack
 372
 373 #
 374 # Check for options to disable stack protector, which needs to be
 375 # disabled for a few early-bootstrap translation units. If not found,
 376 # this is not an error; we assume the toolchain does not do ssp.
 377 #
 378 tryflag CFLAGS_NOSSP -fno-stack-protector
 379
 380 #
 381 # Check for options that may be needed to prevent the compiler from
 382 # generating self-referential versions of memcpy,, memmove, memcmp,
 383 # and memset. Really, we should add a check to determine if this
 384 # option is sufficient, and if not, add a macro to cripple these
 385 # functions with volatile...
 386 #
 387 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 388
 389 #
 390 # Enable debugging if requessted.
 391 #
 392 test "$debug" = yes && CFLAGS_AUTO=-g
 393
 394 #
 395 # Preprocess asm files to add extra debugging information if debug is
 396 # enabled, our assembler supports the needed directives, and the
 397 # preprocessing script has been written for our architecture.
 398 #
 399 printf "checking whether we should preprocess assembly to add debugging information... "
 400 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
 401    test -f "tools/add-cfi.$ARCH.awk" &&
 402    printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
 403 then
 404   ADD_CFI=yes
 405 else
 406   ADD_CFI=no
 407 fi
 408 printf "%s\n" "$ADD_CFI"
 409
 410 #
 411 # Possibly add a -O option to CFLAGS and select modules to optimize with
 412 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 413 #
 414 printf "checking for optimization settings... "
 415 case "x$optimize" in
 416 xauto)
 417 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 418 printf "using provided CFLAGS\n" ;optimize=no
 419 else
 420 printf "using defaults\n" ; optimize=yes
 421 fi
 422 ;;
 423 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 424 xno|x) printf "disabled\n" ; optimize=no ;;
 425 *) printf "custom\n" ;;
 426 esac
 427
 428 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 429 test "$optimize" = yes && optimize="internal,malloc,string"
 430
 431 if fnmatch 'no|size' "$optimize" ; then :
 432 else
 433 printf "components to be optimized for speed:"
 434 while test "$optimize" ; do
 435 case "$optimize" in
 436 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 437 *) this=$optimize optimize=
 438 esac
 439 printf " $this"
 440 case "$this" in
 441 */*.c) ;;
 442 */*) this=$this*.c ;;
 443 *) this=$this/*.c ;;
 444 esac
 445 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 446 done
 447 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 448 printf "\n"
 449 fi
 450
 451 # Always try -pipe
 452 tryflag CFLAGS_AUTO -pipe
 453
 454 #
 455 # If debugging is disabled, omit frame pointer. Modern GCC does this
 456 # anyway on most archs even when debugging is enabled since the frame
 457 # pointer is no longer needed for debugging.
 458 #
 459 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 460 else
 461 tryflag CFLAGS_AUTO -fomit-frame-pointer
 462 fi
 463
 464 #
 465 # Modern GCC wants to put DWARF tables (used for debugging and
 466 # unwinding) in the loaded part of the program where they are
 467 # unstrippable. These options force them back to debug sections (and
 468 # cause them not to get generated at all if debugging is off).
 469 #
 470 tryflag CFLAGS_AUTO -fno-unwind-tables
 471 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 472
 473 #
 474 # Attempt to put each function and each data object in its own
 475 # section. This both allows additional size optimizations at link
 476 # time and works around a dangerous class of compiler/assembler bugs
 477 # whereby relative address expressions are constant-folded by the
 478 # assembler even when one or more of the symbols involved is
 479 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
 480 #
 481 tryflag CFLAGS_AUTO -ffunction-sections
 482 tryflag CFLAGS_AUTO -fdata-sections
 483
 484 #
 485 # On x86, make sure we don't have incompatible instruction set
 486 # extensions enabled by default. This is bad for making static binaries.
 487 # We cheat and use i486 rather than i386 because i386 really does not
 488 # work anyway (issues with atomic ops).
 489 # Some build environments pass -march and -mtune options via CC, so
 490 # check both CC and CFLAGS.
 491 #
 492 if test "$ARCH" = "i386" ; then
 493 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 494 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 495 fi
 496
 497 #
 498 # Even with -std=c99, gcc accepts some constructs which are constraint
 499 # violations. We want to treat these as errors regardless of whether
 500 # other purely stylistic warnings are enabled -- especially implicit
 501 # function declarations, which are a dangerous programming error.
 502 #
 503 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 504 tryflag CFLAGS_AUTO -Werror=implicit-int
 505 tryflag CFLAGS_AUTO -Werror=pointer-sign
 506 tryflag CFLAGS_AUTO -Werror=pointer-arith
 507
 508 #
 509 # GCC ignores unused arguements by default, but Clang needs this extra
 510 # parameter to stop printing warnings about LDFLAGS passed during
 511 # compiling stage and CFLAGS passed during linking stage.
 512 #
 513 test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments
 514
 515 if test "x$warnings" = xyes ; then
 516 tryflag CFLAGS_AUTO -Wall
 517 tryflag CFLAGS_AUTO -Wno-parentheses
 518 tryflag CFLAGS_AUTO -Wno-uninitialized
 519 tryflag CFLAGS_AUTO -Wno-missing-braces
 520 tryflag CFLAGS_AUTO -Wno-unused-value
 521 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 522 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 523 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 524 fi
 525
 526 # Determine if the compiler produces position-independent code (PIC)
 527 # by default. If so, we don't need to compile separate object files
 528 # for libc.a and libc.so.
 529 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 530 pic_default=yes
 531 else
 532 pic_default=no
 533 fi
 534
 535 # Reduce space lost to padding for alignment purposes by sorting data
 536 # objects according to their alignment reqirements. This approximates
 537 # optimal packing.
 538 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 539 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 540
 541 # When linking shared library, drop dummy weak definitions that were
 542 # replaced by strong definitions from other translation units.
 543 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 544
 545 # Some patched GCC builds have these defaults messed up...
 546 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 547
 548 # Prevent linking if there are undefined symbols; if any exist,
 549 # libc.so will crash at runtime during relocation processing.
 550 # The common way this can happen is failure to link the compiler
 551 # runtime library; implementation error is also a possibility.
 552 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 553
 554 # Avoid exporting symbols from compiler runtime libraries. They
 555 # should be hidden anyway, but some toolchains including old gcc
 556 # versions built without shared library support and pcc are broken.
 557 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 558
 559 # Public data symbols must be interposable to allow for copy
 560 # relocations, but otherwise we want to bind symbols at libc link
 561 # time to eliminate startup relocations and PLT overhead. Use
 562 # --dynamic-list rather than -Bsymbolic-functions for greater
 563 # control over what symbols are left unbound.
 564 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
 565
 566 # Find compiler runtime library
 567 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 568 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 569 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
 570                  && tryldflag LIBCC "$try_libcc"
 571 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 572                  && tryldflag LIBCC "$try_libcc"
 573 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 574
 575 # Figure out arch variants for archs with variants
 576 SUBARCH=
 577 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 578
 579 if test "$ARCH" = "i386" ; then
 580 printf "checking whether compiler can use ebx in PIC asm constraints... "
 581 cat > "$tmpc" <<EOF
 582 int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; }
 583 EOF
 584 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \
 585   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 586 printf "yes\n"
 587 else
 588 printf "no\n"
 589 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM"
 590 fi
 591 fi
 592
 593 if test "$ARCH" = "x86_64" ; then
 594 trycppif __ILP32__ "$t" && ARCH=x32
 595 fi
 596
 597 if test "$ARCH" = "arm" ; then
 598 if trycppif __thumb2__ "$t" ; then
 599 tryflag CFLAGS_AUTO -mimplicit-it=always
 600 tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
 601 tryflag CFLAGS_AUTO -Wa,-mthumb
 602 fi
 603 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 604 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 605 # Versions of clang up until at least 3.8 have the wrong constraint codes
 606 # for floating point operands to inline asm. Detect this so the affected
 607 # source files can just disable the asm.
 608 if test "$cc_family" = clang ; then
 609 printf "checking whether clang's vfp asm constraints work... "
 610 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
 611 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 612 printf "yes\n"
 613 else
 614 printf "no\n"
 615 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
 616 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 617 fi
 618 fi
 619 fi
 620
 621 if test "$ARCH" = "aarch64" ; then
 622 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
 623 fi
 624
 625 if test "$ARCH" = "m68k" ; then
 626 if trycppif "__HAVE_68881__" ; then : ;
 627 elif trycppif "__mcffpu__" ; then SUBARCH="-fp64"
 628 else SUBARCH="-sf"
 629 fi
 630 fi
 631
 632 if test "$ARCH" = "mips" ; then
 633 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 634 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 635 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 636 fi
 637
 638 if test "$ARCH" = "mips64" ; then
 639 trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
 640 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 641 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 642 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 643 fi
 644
 645 if test "$ARCH" = "powerpc" ; then
 646 trycppif "__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \
 647   "$0: error: compiler's floating point configuration is unsupported"
 648 trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
 649 fi
 650
 651 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 652 && SUBARCH=${SUBARCH}el
 653
 654 if test "$ARCH" = "powerpc64" ; then
 655 trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
 656 trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
 657 trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
 658 fi
 659
 660 if test "$ARCH" = "riscv64" ; then
 661 trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf
 662 trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp
 663 fi
 664
 665 if test "$ARCH" = "sh" ; then
 666 tryflag CFLAGS_AUTO -Wa,--isa=any
 667 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 668 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 669 # Some sh configurations are broken and replace double with float
 670 # rather than using softfloat when the fpu is present but only
 671 # supports single precision. Reject them.
 672 printf "checking whether compiler's double type is IEEE double... "
 673 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
 674 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 675 printf "yes\n"
 676 else
 677 printf "no\n"
 678 fail "$0: error: compiler's floating point configuration is unsupported"
 679 fi
 680 else
 681 SUBARCH=${SUBARCH}-nofpu
 682 fi
 683 if trycppif __SH_FDPIC__ "$t" ; then
 684 SUBARCH=${SUBARCH}-fdpic
 685 fi
 686 fi
 687
 688 test "$SUBARCH" \
 689 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 690
 691 case "$ARCH$SUBARCH" in
 692 arm) ASMSUBARCH=el ;;
 693 *) ASMSUBARCH=$SUBARCH ;;
 694 esac
 695
 696 #
 697 # Some archs (powerpc) have different possible long double formats
 698 # that the compiler can be configured for. The logic for whether this
 699 # is supported is in bits/float.h; in general, it is not. We need to
 700 # check for mismatches here or code in printf, strotd, and scanf will
 701 # be dangerously incorrect because it depends on (1) the macros being
 702 # correct, and (2) IEEE semantics.
 703 #
 704 printf "checking whether compiler's long double definition matches float.h... "
 705 echo '#include <float.h>' > "$tmpc"
 706 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
 707 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
 708 if $CC $CFLAGS_C99FSE \
 709   -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
 710   $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 711 printf "yes\n"
 712 else
 713 printf "no\n"
 714 fail "$0: error: unsupported long double type"
 715 fi
 716
 717 #
 718 # Some build systems globally pass in broken CFLAGS like -ffast-math
 719 # for all packages. On recent GCC we can detect this and error out
 720 # early rather than producing a seriously-broken math library.
 721 #
 722 if trycppif "__FAST_MATH__" \
 723   "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 724 fail "$0: error: compiler has broken floating point; check CFLAGS"
 725 fi
 726
 727 printf "creating config.mak... "
 728
 729 cmdline=$(quote "$0")
 730 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 731
 732 exec 3>&1 1>config.mak
 733
 734
 735 cat << EOF
 736 # This version of config.mak was generated by:
 737 # $cmdline
 738 # Any changes made here will be lost if configure is re-run
 739 AR = ${AR:-\$(CROSS_COMPILE)ar}
 740 RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib}
 741 ARCH = $ARCH
 742 SUBARCH = $SUBARCH
 743 ASMSUBARCH = $ASMSUBARCH
 744 srcdir = $srcdir
 745 prefix = $prefix
 746 exec_prefix = $exec_prefix
 747 bindir = $bindir
 748 libdir = $libdir
 749 includedir = $includedir
 750 syslibdir = $syslibdir
 751 CC = $CC
 752 CFLAGS = $CFLAGS
 753 CFLAGS_AUTO = $CFLAGS_AUTO
 754 CFLAGS_C99FSE = $CFLAGS_C99FSE
 755 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 756 CFLAGS_NOSSP = $CFLAGS_NOSSP
 757 CPPFLAGS = $CPPFLAGS
 758 LDFLAGS = $LDFLAGS
 759 LDFLAGS_AUTO = $LDFLAGS_AUTO
 760 CROSS_COMPILE = $CROSS_COMPILE
 761 LIBCC = $LIBCC
 762 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 763 ALL_TOOLS = $tools
 764 TOOL_LIBS = $tool_libs
 765 ADD_CFI = $ADD_CFI
 766 EOF
 767 test "x$static" = xno && echo "STATIC_LIBS ="
 768 test "x$shared" = xno && echo "SHARED_LIBS ="
 769 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
 770 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 771 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
 772 exec 1>&3 3>&-
 773
 774 test "$srcdir" = "." || ln -sf $srcdir/Makefile .
 775
 776 printf "done\n"