libc-top-half/musl/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 Optional packages:
  39   --with-malloc=...       choose malloc implementation [mallocng]
  40
  41 Some influential environment variables:
  42   CC                      C compiler command [detected]
  43   CFLAGS                  C compiler flags [-Os -pipe ...]
  44   CROSS_COMPILE           prefix for cross compiler and tools [none]
  45   LIBCC                   compiler runtime library [detected]
  46
  47 Use these variables to override the choices made by configure.
  48
  49 EOF
  50 exit 0
  51 }
  52
  53 # Helper functions
  54
  55 quote () {
  56 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  57 $1
  58 EOF
  59 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  60 }
  61 echo () { printf "%s\n" "$*" ; }
  62 fail () { echo "$*" ; exit 1 ; }
  63 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  64 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  65 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  66
  67 stripdir () {
  68 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  69 }
  70
  71 trycppif () {
  72 printf "checking preprocessor condition %s... " "$1"
  73 echo "typedef int x;" > "$tmpc"
  74 echo "#if $1" >> "$tmpc"
  75 echo "#error yes" >> "$tmpc"
  76 echo "#endif" >> "$tmpc"
  77 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  78 printf "false\n"
  79 return 1
  80 else
  81 printf "true\n"
  82 return 0
  83 fi
  84 }
  85
  86 tryflag () {
  87 printf "checking whether compiler accepts %s... " "$2"
  88 echo "typedef int x;" > "$tmpc"
  89 if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  90 printf "yes\n"
  91 eval "$1=\"\${$1} \$2\""
  92 eval "$1=\${$1# }"
  93 return 0
  94 else
  95 printf "no\n"
  96 return 1
  97 fi
  98 }
  99
 100 tryldflag () {
 101 printf "checking whether linker accepts %s... " "$2"
 102 echo "typedef int x;" > "$tmpc"
 103 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 104 printf "yes\n"
 105 eval "$1=\"\${$1} \$2\""
 106 eval "$1=\${$1# }"
 107 return 0
 108 else
 109 printf "no\n"
 110 return 1
 111 fi
 112 }
 113
 114
 115
 116 # Beginning of actual script
 117
 118 CFLAGS_C99FSE=
 119 CFLAGS_AUTO=
 120 CFLAGS_MEMOPS=
 121 CFLAGS_NOSSP=
 122 CFLAGS_TRY=
 123 LDFLAGS_AUTO=
 124 LDFLAGS_TRY=
 125 OPTIMIZE_GLOBS=
 126 srcdir=
 127 prefix=/usr/local/musl
 128 exec_prefix='$(prefix)'
 129 bindir='$(exec_prefix)/bin'
 130 libdir='$(prefix)/lib'
 131 includedir='$(prefix)/include'
 132 syslibdir='/lib'
 133 tools=
 134 tool_libs=
 135 build=
 136 target=
 137 optimize=auto
 138 debug=no
 139 warnings=no
 140 shared=auto
 141 static=yes
 142 wrapper=auto
 143 gcc_wrapper=no
 144 clang_wrapper=no
 145 malloc_dir=mallocng
 146
 147 for arg ; do
 148 case "$arg" in
 149 --help|-h) usage ;;
 150 --srcdir=*) srcdir=${arg#*=} ;;
 151 --prefix=*) prefix=${arg#*=} ;;
 152 --exec-prefix=*) exec_prefix=${arg#*=} ;;
 153 --bindir=*) bindir=${arg#*=} ;;
 154 --libdir=*) libdir=${arg#*=} ;;
 155 --includedir=*) includedir=${arg#*=} ;;
 156 --syslibdir=*) syslibdir=${arg#*=} ;;
 157 --enable-shared|--enable-shared=yes) shared=yes ;;
 158 --disable-shared|--enable-shared=no) shared=no ;;
 159 --enable-static|--enable-static=yes) static=yes ;;
 160 --disable-static|--enable-static=no) static=no ;;
 161 --enable-optimize) optimize=yes ;;
 162 --enable-optimize=*) optimize=${arg#*=} ;;
 163 --disable-optimize) optimize=no ;;
 164 --enable-debug|--enable-debug=yes) debug=yes ;;
 165 --disable-debug|--enable-debug=no) debug=no ;;
 166 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 167 --disable-warnings|--enable-warnings=no) warnings=no ;;
 168 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
 169 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
 170 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
 171 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
 172 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
 173 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
 174 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 175 --with-malloc=*) malloc_dir=${arg#*=} ;;
 176 --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
 177 --host=*|--target=*) target=${arg#*=} ;;
 178 --build=*) build=${arg#*=} ;;
 179 -* ) echo "$0: unknown option $arg" ;;
 180 AR=*) AR=${arg#*=} ;;
 181 RANLIB=*) RANLIB=${arg#*=} ;;
 182 CC=*) CC=${arg#*=} ;;
 183 CFLAGS=*) CFLAGS=${arg#*=} ;;
 184 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 185 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 186 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 187 LIBCC=*) LIBCC=${arg#*=} ;;
 188 *=*) ;;
 189 *) build=$arg ; target=$arg ;;
 190 esac
 191 done
 192
 193 for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do
 194 stripdir $i
 195 done
 196
 197 #
 198 # Get the source dir for out-of-tree builds
 199 #
 200 if test -z "$srcdir" ; then
 201 srcdir="${0%/configure}"
 202 stripdir srcdir
 203 fi
 204 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
 205 abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
 206 test "$abs_srcdir" = "$abs_builddir" && srcdir=.
 207 test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
 208
 209 #
 210 # Get a temp filename we can use
 211 #
 212 i=0
 213 set -C
 214 while : ; do i=$(($i+1))
 215 tmpc="./conf$$-$PPID-$i.c"
 216 2>|/dev/null > "$tmpc" && break
 217 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 218 done
 219 set +C
 220 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 221
 222 #
 223 # Check that the requested malloc implementation exists
 224 #
 225 test -d "$srcdir/src/malloc/$malloc_dir" \
 226 || fail "$0: error: chosen malloc implementation '$malloc_dir' does not exist"
 227
 228 #
 229 # Check whether we are cross-compiling, and set a default
 230 # CROSS_COMPILE prefix if none was provided.
 231 #
 232 test "$target" && \
 233 test "$target" != "$build" && \
 234 test -z "$CROSS_COMPILE" && \
 235 CROSS_COMPILE="$target-"
 236
 237 #
 238 # Find a C compiler to use
 239 #
 240 printf "checking for C compiler... "
 241 trycc ${CROSS_COMPILE}gcc
 242 trycc ${CROSS_COMPILE}c99
 243 trycc ${CROSS_COMPILE}cc
 244 printf "%s\n" "$CC"
 245 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 246
 247 printf "checking whether C compiler works... "
 248 echo "typedef int x;" > "$tmpc"
 249 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
 250 printf "yes\n"
 251 else
 252 printf "no; compiler output follows:\n%s\n" "$output"
 253 exit 1
 254 fi
 255
 256 #
 257 # Figure out options to force errors on unknown flags.
 258 #
 259 tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
 260 tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 261 tryflag   CFLAGS_TRY  -Werror=ignored-optimization-argument
 262 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 263 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 264
 265 #
 266 # Need to know if the compiler is gcc or clang to decide which toolchain
 267 # wrappers to build.
 268 #
 269 printf "checking for C compiler family... "
 270 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
 271 cc_family=unknown
 272 if fnmatch '*gcc\ version*' "$cc_ver" ; then
 273 cc_family=gcc
 274 elif fnmatch '*clang\ version*' "$cc_ver" ; then
 275 cc_family=clang
 276 fi
 277 echo "$cc_family"
 278
 279 #
 280 # Figure out toolchain wrapper to build
 281 #
 282 if test "$wrapper" = auto -o "$wrapper" = detect ; then
 283 echo "#include <stdlib.h>" > "$tmpc"
 284 echo "#if ! __GLIBC__" >> "$tmpc"
 285 echo "#error no" >> "$tmpc"
 286 echo "#endif" >> "$tmpc"
 287 printf "checking for toolchain wrapper to build... "
 288 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 289 echo "none"
 290 elif test "$cc_family" = gcc ; then
 291 gcc_wrapper=yes
 292 echo "gcc"
 293 elif test "$cc_family" = clang ; then
 294 clang_wrapper=yes
 295 echo "clang"
 296 else
 297 echo "none"
 298 if test "$wrapper" = detect ; then
 299 fail "$0: could not find an appropriate toolchain wrapper"
 300 fi
 301 fi
 302 fi
 303
 304 if test "$gcc_wrapper" = yes ; then
 305 tools="$tools obj/musl-gcc"
 306 tool_libs="$tool_libs lib/musl-gcc.specs"
 307 fi
 308 if test "$clang_wrapper" = yes ; then
 309 tools="$tools obj/musl-clang obj/ld.musl-clang"
 310 fi
 311
 312 #
 313 # Find the target architecture
 314 #
 315 printf "checking target system type... "
 316 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 317 printf "%s\n" "$target"
 318
 319 #
 320 # Convert to just ARCH
 321 #
 322 case "$target" in
 323 # Catch these early to simplify matching for 32-bit archs
 324 arm*) ARCH=arm ;;
 325 aarch64*) ARCH=aarch64 ;;
 326 i?86-nt32*) ARCH=nt32 ;;
 327 i?86*) ARCH=i386 ;;
 328 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 329 x86_64-nt64*) ARCH=nt64 ;;
 330 x86_64*) ARCH=x86_64 ;;
 331 m68k*) ARCH=m68k ;;
 332 mips64*|mipsisa64*) ARCH=mips64 ;;
 333 mips*) ARCH=mips ;;
 334 microblaze*) ARCH=microblaze ;;
 335 or1k*) ARCH=or1k ;;
 336 powerpc64*|ppc64*) ARCH=powerpc64 ;;
 337 powerpc*|ppc*) ARCH=powerpc ;;
 338 riscv64*) ARCH=riscv64 ;;
 339 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
 340 s390x*) ARCH=s390x ;;
 341 wasm32) ARCH=wasm32 ;;
 342 wasm64) ARCH=wasm64 ;;
 343 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 344 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 345 esac
 346
 347 #
 348 # Try to get a conforming C99 freestanding environment
 349 #
 350 tryflag CFLAGS_C99FSE -std=c99
 351 tryflag CFLAGS_C99FSE -nostdinc
 352 tryflag CFLAGS_C99FSE -ffreestanding \
 353 || tryflag CFLAGS_C99FSE -fno-builtin
 354 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 355 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 356 tryflag CFLAGS_C99FSE -frounding-math
 357
 358 #
 359 # We may use the may_alias attribute if __GNUC__ is defined, so
 360 # if the compiler defines __GNUC__ but does not provide it,
 361 # it must be defined away as part of the CFLAGS.
 362 #
 363 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 364 cat > "$tmpc" <<EOF
 365 typedef int
 366 #ifdef __GNUC__
 367 __attribute__((__may_alias__))
 368 #endif
 369 x;
 370 EOF
 371 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 372   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 373 printf "no\n"
 374 else
 375 printf "yes\n"
 376 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 377 fi
 378
 379 #
 380 # The GNU toolchain defaults to assuming unmarked files need an
 381 # executable stack, potentially exposing vulnerabilities in programs
 382 # linked with such object files. Fix this.
 383 #
 384 tryflag CFLAGS_C99FSE -Wa,--noexecstack
 385
 386 #
 387 # Check for options to disable stack protector, which needs to be
 388 # disabled for a few early-bootstrap translation units. If not found,
 389 # this is not an error; we assume the toolchain does not do ssp.
 390 #
 391 tryflag CFLAGS_NOSSP -fno-stack-protector
 392
 393 #
 394 # Check for options that may be needed to prevent the compiler from
 395 # generating self-referential versions of memcpy,, memmove, memcmp,
 396 # and memset. Really, we should add a check to determine if this
 397 # option is sufficient, and if not, add a macro to cripple these
 398 # functions with volatile...
 399 #
 400 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 401
 402 #
 403 # Enable debugging if requessted.
 404 #
 405 test "$debug" = yes && CFLAGS_AUTO=-g
 406
 407 #
 408 # Preprocess asm files to add extra debugging information if debug is
 409 # enabled, our assembler supports the needed directives, and the
 410 # preprocessing script has been written for our architecture.
 411 #
 412 printf "checking whether we should preprocess assembly to add debugging information... "
 413 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
 414    test -f "tools/add-cfi.$ARCH.awk" &&
 415    printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
 416 then
 417   ADD_CFI=yes
 418 else
 419   ADD_CFI=no
 420 fi
 421 printf "%s\n" "$ADD_CFI"
 422
 423 #
 424 # Possibly add a -O option to CFLAGS and select modules to optimize with
 425 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 426 #
 427 printf "checking for optimization settings... "
 428 case "x$optimize" in
 429 xauto)
 430 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 431 printf "using provided CFLAGS\n" ;optimize=no
 432 else
 433 printf "using defaults\n" ; optimize=yes
 434 fi
 435 ;;
 436 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 437 xno|x) printf "disabled\n" ; optimize=no ;;
 438 *) printf "custom\n" ;;
 439 esac
 440
 441 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 442 test "$optimize" = yes && optimize="internal,malloc,string"
 443
 444 if fnmatch 'no|size' "$optimize" ; then :
 445 else
 446 printf "components to be optimized for speed:"
 447 while test "$optimize" ; do
 448 case "$optimize" in
 449 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 450 *) this=$optimize optimize=
 451 esac
 452 printf " $this"
 453 case "$this" in
 454 */*.c) ;;
 455 */*) this=$this*.c ;;
 456 *) this=$this/*.c ;;
 457 esac
 458 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 459 done
 460 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 461 printf "\n"
 462 fi
 463
 464 # Always try -pipe
 465 tryflag CFLAGS_AUTO -pipe
 466
 467 #
 468 # If debugging is disabled, omit frame pointer. Modern GCC does this
 469 # anyway on most archs even when debugging is enabled since the frame
 470 # pointer is no longer needed for debugging.
 471 #
 472 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 473 else
 474 tryflag CFLAGS_AUTO -fomit-frame-pointer
 475 fi
 476
 477 #
 478 # Modern GCC wants to put DWARF tables (used for debugging and
 479 # unwinding) in the loaded part of the program where they are
 480 # unstrippable. These options force them back to debug sections (and
 481 # cause them not to get generated at all if debugging is off).
 482 #
 483 tryflag CFLAGS_AUTO -fno-unwind-tables
 484 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 485
 486 #
 487 # Attempt to put each function and each data object in its own
 488 # section. This both allows additional size optimizations at link
 489 # time and works around a dangerous class of compiler/assembler bugs
 490 # whereby relative address expressions are constant-folded by the
 491 # assembler even when one or more of the symbols involved is
 492 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
 493 #
 494 tryflag CFLAGS_AUTO -ffunction-sections
 495 tryflag CFLAGS_AUTO -fdata-sections
 496
 497 #
 498 # On x86, make sure we don't have incompatible instruction set
 499 # extensions enabled by default. This is bad for making static binaries.
 500 # We cheat and use i486 rather than i386 because i386 really does not
 501 # work anyway (issues with atomic ops).
 502 # Some build environments pass -march and -mtune options via CC, so
 503 # check both CC and CFLAGS.
 504 #
 505 if test "$ARCH" = "i386" ; then
 506 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 507 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 508 fi
 509
 510 #
 511 # GCC defines -w as overriding any -W options, regardless of order, but
 512 # clang has a bunch of annoying warnings enabled by default and needs -w
 513 # to start from a clean slate. So use -w if building with clang.
 514 #
 515 test "$cc_family" = clang && tryflag CFLAGS_AUTO -w
 516
 517 #
 518 # Even with -std=c99, gcc accepts some constructs which are constraint
 519 # violations. We want to treat these as errors regardless of whether
 520 # other purely stylistic warnings are enabled -- especially implicit
 521 # function declarations, which are a dangerous programming error.
 522 #
 523 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 524 tryflag CFLAGS_AUTO -Werror=implicit-int
 525 tryflag CFLAGS_AUTO -Werror=pointer-sign
 526 tryflag CFLAGS_AUTO -Werror=pointer-arith
 527
 528 #
 529 # GCC ignores unused arguements by default, but Clang needs this extra
 530 # parameter to stop printing warnings about LDFLAGS passed during
 531 # compiling stage and CFLAGS passed during linking stage.
 532 #
 533 test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments
 534
 535 if test "x$warnings" = xyes ; then
 536 tryflag CFLAGS_AUTO -Wall
 537 tryflag CFLAGS_AUTO -Wno-parentheses
 538 tryflag CFLAGS_AUTO -Wno-uninitialized
 539 tryflag CFLAGS_AUTO -Wno-missing-braces
 540 tryflag CFLAGS_AUTO -Wno-unused-value
 541 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 542 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 543 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 544 fi
 545
 546 # Determine if the compiler produces position-independent code (PIC)
 547 # by default. If so, we don't need to compile separate object files
 548 # for libc.a and libc.so.
 549 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 550 pic_default=yes
 551 else
 552 pic_default=no
 553 fi
 554
 555 # Reduce space lost to padding for alignment purposes by sorting data
 556 # objects according to their alignment reqirements. This approximates
 557 # optimal packing.
 558 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 559 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 560
 561 # When linking shared library, drop dummy weak definitions that were
 562 # replaced by strong definitions from other translation units.
 563 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 564
 565 # Some patched GCC builds have these defaults messed up...
 566 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 567
 568 # Prevent linking if there are undefined symbols; if any exist,
 569 # libc.so will crash at runtime during relocation processing.
 570 # The common way this can happen is failure to link the compiler
 571 # runtime library; implementation error is also a possibility.
 572 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 573
 574 # Avoid exporting symbols from compiler runtime libraries. They
 575 # should be hidden anyway, but some toolchains including old gcc
 576 # versions built without shared library support and pcc are broken.
 577 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 578
 579 # Public data symbols must be interposable to allow for copy
 580 # relocations, but otherwise we want to bind symbols at libc link
 581 # time to eliminate startup relocations and PLT overhead. Use
 582 # --dynamic-list rather than -Bsymbolic-functions for greater
 583 # control over what symbols are left unbound.
 584 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
 585
 586 # Find compiler runtime library
 587 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 588 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 589 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
 590                  && tryldflag LIBCC "$try_libcc"
 591 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 592                  && tryldflag LIBCC "$try_libcc"
 593 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 594
 595 # Figure out arch variants for archs with variants
 596 SUBARCH=
 597 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 598
 599 if test "$ARCH" = "i386" ; then
 600 printf "checking whether compiler can use ebx in PIC asm constraints... "
 601 cat > "$tmpc" <<EOF
 602 int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; }
 603 EOF
 604 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \
 605   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 606 printf "yes\n"
 607 else
 608 printf "no\n"
 609 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM"
 610 fi
 611 fi
 612
 613 if test "$ARCH" = "x86_64" ; then
 614 trycppif __ILP32__ "$t" && ARCH=x32
 615 fi
 616
 617 if test "$ARCH" = "arm" ; then
 618 if trycppif __thumb2__ "$t" ; then
 619 tryflag CFLAGS_AUTO -mimplicit-it=always
 620 tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
 621 tryflag CFLAGS_AUTO -Wa,-mthumb
 622 fi
 623 trycppif __ARMEB__ "$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=${SUBARCH}-sf
 669 printf "checking whether compiler can use 'd' constraint in asm... "
 670 echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc"
 671 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 672 printf "yes\n"
 673 else
 674 printf "no\n"
 675 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM"
 676 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 677 fi
 678 fi
 679
 680 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 681 && SUBARCH=${SUBARCH}el
 682
 683 if test "$ARCH" = "powerpc64" ; then
 684 trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
 685 trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
 686 trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
 687 fi
 688
 689 if test "$ARCH" = "riscv64" ; then
 690 trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf
 691 trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp
 692 fi
 693
 694 if test "$ARCH" = "sh" ; then
 695 tryflag CFLAGS_AUTO -Wa,--isa=any
 696 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 697 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 698 # Some sh configurations are broken and replace double with float
 699 # rather than using softfloat when the fpu is present but only
 700 # supports single precision. Reject them.
 701 printf "checking whether compiler's double type is IEEE double... "
 702 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
 703 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 704 printf "yes\n"
 705 else
 706 printf "no\n"
 707 fail "$0: error: compiler's floating point configuration is unsupported"
 708 fi
 709 else
 710 SUBARCH=${SUBARCH}-nofpu
 711 fi
 712 if trycppif __SH_FDPIC__ "$t" ; then
 713 SUBARCH=${SUBARCH}-fdpic
 714 fi
 715 fi
 716
 717 test "$SUBARCH" \
 718 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 719
 720 case "$ARCH$SUBARCH" in
 721 arm) ASMSUBARCH=el ;;
 722 *) ASMSUBARCH=$SUBARCH ;;
 723 esac
 724
 725 #
 726 # Some archs (powerpc) have different possible long double formats
 727 # that the compiler can be configured for. The logic for whether this
 728 # is supported is in bits/float.h; in general, it is not. We need to
 729 # check for mismatches here or code in printf, strotd, and scanf will
 730 # be dangerously incorrect because it depends on (1) the macros being
 731 # correct, and (2) IEEE semantics.
 732 #
 733 printf "checking whether compiler's long double definition matches float.h... "
 734 echo '#include <float.h>' > "$tmpc"
 735 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
 736 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
 737 if $CC $CFLAGS_C99FSE \
 738   -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
 739   $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 740 printf "yes\n"
 741 else
 742 printf "no\n"
 743 fail "$0: error: unsupported long double type"
 744 fi
 745
 746 #
 747 # Some build systems globally pass in broken CFLAGS like -ffast-math
 748 # for all packages. On recent GCC we can detect this and error out
 749 # early rather than producing a seriously-broken math library.
 750 #
 751 if trycppif "__FAST_MATH__" \
 752   "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 753 fail "$0: error: compiler has broken floating point; check CFLAGS"
 754 fi
 755
 756 printf "creating config.mak... "
 757
 758 cmdline=$(quote "$0")
 759 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 760
 761 exec 3>&1 1>config.mak
 762
 763
 764 cat << EOF
 765 # This version of config.mak was generated by:
 766 # $cmdline
 767 # Any changes made here will be lost if configure is re-run
 768 AR = ${AR:-\$(CROSS_COMPILE)ar}
 769 RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib}
 770 ARCH = $ARCH
 771 SUBARCH = $SUBARCH
 772 ASMSUBARCH = $ASMSUBARCH
 773 srcdir = $srcdir
 774 prefix = $prefix
 775 exec_prefix = $exec_prefix
 776 bindir = $bindir
 777 libdir = $libdir
 778 includedir = $includedir
 779 syslibdir = $syslibdir
 780 CC = $CC
 781 CFLAGS = $CFLAGS
 782 CFLAGS_AUTO = $CFLAGS_AUTO
 783 CFLAGS_C99FSE = $CFLAGS_C99FSE
 784 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 785 CFLAGS_NOSSP = $CFLAGS_NOSSP
 786 CPPFLAGS = $CPPFLAGS
 787 LDFLAGS = $LDFLAGS
 788 LDFLAGS_AUTO = $LDFLAGS_AUTO
 789 CROSS_COMPILE = $CROSS_COMPILE
 790 LIBCC = $LIBCC
 791 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 792 ALL_TOOLS = $tools
 793 TOOL_LIBS = $tool_libs
 794 ADD_CFI = $ADD_CFI
 795 MALLOC_DIR = $malloc_dir
 796 EOF
 797 test "x$static" = xno && echo "STATIC_LIBS ="
 798 test "x$shared" = xno && echo "SHARED_LIBS ="
 799 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
 800 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 801 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
 802 exec 1>&3 3>&-
 803
 804 test "$srcdir" = "." || ln -sf $srcdir/Makefile .
 805
 806 printf "done\n"