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   --disable-warnings      build with recommended warnings flags [enabled]
  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='$(prefix)/include'
 132 syslibdir='/lib'
 133 tools=
 134 tool_libs=
 135 build=
 136 target=
 137 optimize=auto
 138 debug=no
 139 warnings=yes
 140 shared=auto
 141 static=yes
 142 wrapper=auto
 143 gcc_wrapper=no
 144 clang_wrapper=no
 145 malloc_dir=mallocng
 146
 147 for arg ; do
 148 case "$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" != "." && test -f Makefile && test ! -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 "$wrapper" = auto || test "$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 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 342 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 343 esac
 344
 345 #
 346 # Try to get a conforming C99 freestanding environment
 347 #
 348 tryflag CFLAGS_C99FSE -std=c99
 349 tryflag CFLAGS_C99FSE -nostdinc
 350 tryflag CFLAGS_C99FSE -ffreestanding \
 351 || tryflag CFLAGS_C99FSE -fno-builtin
 352 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 353 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 354 tryflag CFLAGS_C99FSE -frounding-math
 355
 356 #
 357 # Semantically we want to insist that our sources follow the
 358 # C rules for type-based aliasing, but most if not all real-world
 359 # compilers are known or suspected to have critical bugs in their
 360 # type-based aliasing analysis. See for example GCC bug 107107.
 361 #
 362 tryflag CFLAGS_C99FSE -fno-strict-aliasing
 363
 364 #
 365 # We may use the may_alias attribute if __GNUC__ is defined, so
 366 # if the compiler defines __GNUC__ but does not provide it,
 367 # it must be defined away as part of the CFLAGS.
 368 #
 369 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 370 cat > "$tmpc" <<EOF
 371 typedef int
 372 #ifdef __GNUC__
 373 __attribute__((__may_alias__))
 374 #endif
 375 x;
 376 EOF
 377 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
 378   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 379 printf "no\n"
 380 else
 381 printf "yes\n"
 382 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 383 fi
 384
 385 #
 386 # The GNU toolchain defaults to assuming unmarked files need an
 387 # executable stack, potentially exposing vulnerabilities in programs
 388 # linked with such object files. Fix this.
 389 #
 390 tryflag CFLAGS_C99FSE -Wa,--noexecstack
 391
 392 #
 393 # Check for options to disable stack protector, which needs to be
 394 # disabled for a few early-bootstrap translation units. If not found,
 395 # this is not an error; we assume the toolchain does not do ssp.
 396 #
 397 tryflag CFLAGS_NOSSP -fno-stack-protector
 398
 399 #
 400 # Check for options that may be needed to prevent the compiler from
 401 # generating self-referential versions of memcpy,, memmove, memcmp,
 402 # and memset. Really, we should add a check to determine if this
 403 # option is sufficient, and if not, add a macro to cripple these
 404 # functions with volatile...
 405 #
 406 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 407
 408 #
 409 # Enable debugging if requessted.
 410 #
 411 test "$debug" = yes && CFLAGS_AUTO=-g
 412
 413 #
 414 # Preprocess asm files to add extra debugging information if debug is
 415 # enabled, our assembler supports the needed directives, and the
 416 # preprocessing script has been written for our architecture.
 417 #
 418 printf "checking whether we should preprocess assembly to add debugging information... "
 419 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
 420    test -f "$srcdir/tools/add-cfi.$ARCH.awk" &&
 421    printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
 422 then
 423   ADD_CFI=yes
 424 else
 425   ADD_CFI=no
 426 fi
 427 printf "%s\n" "$ADD_CFI"
 428
 429 #
 430 # Possibly add a -O option to CFLAGS and select modules to optimize with
 431 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 432 #
 433 printf "checking for optimization settings... "
 434 case "x$optimize" in
 435 xauto)
 436 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 437 printf "using provided CFLAGS\n" ;optimize=no
 438 else
 439 printf "using defaults\n" ; optimize=yes
 440 fi
 441 ;;
 442 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 443 xno|x) printf "disabled\n" ; optimize=no ;;
 444 *) printf "custom\n" ;;
 445 esac
 446
 447 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 448 test "$optimize" = yes && optimize="internal,malloc,string"
 449
 450 if fnmatch 'no|size' "$optimize" ; then :
 451 else
 452 printf "components to be optimized for speed:"
 453 while test "$optimize" ; do
 454 case "$optimize" in
 455 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 456 *) this=$optimize optimize=
 457 esac
 458 printf " $this"
 459 case "$this" in
 460 */*.c) ;;
 461 */*) this=$this*.c ;;
 462 *) this=$this/*.c ;;
 463 esac
 464 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 465 done
 466 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 467 printf "\n"
 468 fi
 469
 470 # Always try -pipe
 471 tryflag CFLAGS_AUTO -pipe
 472
 473 #
 474 # If debugging is disabled, omit frame pointer. Modern GCC does this
 475 # anyway on most archs even when debugging is enabled since the frame
 476 # pointer is no longer needed for debugging.
 477 #
 478 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 479 else
 480 tryflag CFLAGS_AUTO -fomit-frame-pointer
 481 fi
 482
 483 #
 484 # Modern GCC wants to put DWARF tables (used for debugging and
 485 # unwinding) in the loaded part of the program where they are
 486 # unstrippable. These options force them back to debug sections (and
 487 # cause them not to get generated at all if debugging is off).
 488 #
 489 tryflag CFLAGS_AUTO -fno-unwind-tables
 490 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 491
 492 #
 493 # Attempt to put each function and each data object in its own
 494 # section. This both allows additional size optimizations at link
 495 # time and works around a dangerous class of compiler/assembler bugs
 496 # whereby relative address expressions are constant-folded by the
 497 # assembler even when one or more of the symbols involved is
 498 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
 499 #
 500 tryflag CFLAGS_AUTO -ffunction-sections
 501 tryflag CFLAGS_AUTO -fdata-sections
 502
 503 #
 504 # On x86, make sure we don't have incompatible instruction set
 505 # extensions enabled by default. This is bad for making static binaries.
 506 # We cheat and use i486 rather than i386 because i386 really does not
 507 # work anyway (issues with atomic ops).
 508 # Some build environments pass -march and -mtune options via CC, so
 509 # check both CC and CFLAGS.
 510 #
 511 if test "$ARCH" = "i386" ; then
 512 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 513 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 514 fi
 515
 516 #
 517 # GCC defines -w as overriding any -W options, regardless of order, but
 518 # clang has a bunch of annoying warnings enabled by default and needs -w
 519 # to start from a clean slate. So use -w if building with clang. Also
 520 # turn off a common on-by-default cast warning regardless of compiler.
 521 #
 522 test "$cc_family" = clang && tryflag CFLAGS_AUTO -w
 523
 524 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 525
 526 #
 527 # Even with -std=c99, gcc accepts some constructs which are constraint
 528 # violations. We want to treat these as errors regardless of whether
 529 # other purely stylistic warnings are enabled -- especially implicit
 530 # function declarations, which are a dangerous programming error.
 531 #
 532 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 533 tryflag CFLAGS_AUTO -Werror=implicit-int
 534 tryflag CFLAGS_AUTO -Werror=pointer-sign
 535 tryflag CFLAGS_AUTO -Werror=pointer-arith
 536 tryflag CFLAGS_AUTO -Werror=int-conversion
 537 tryflag CFLAGS_AUTO -Werror=incompatible-pointer-types
 538 tryflag CFLAGS_AUTO -Werror=discarded-qualifiers
 539 tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers
 540
 541 #
 542 # GCC ignores unused arguements by default, but Clang needs this extra
 543 # parameter to stop printing warnings about LDFLAGS passed during
 544 # compiling stage and CFLAGS passed during linking stage.
 545 #
 546 test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments
 547
 548 if test "x$warnings" = xyes ; then
 549 tryflag CFLAGS_AUTO -Waddress
 550 tryflag CFLAGS_AUTO -Warray-bounds
 551 tryflag CFLAGS_AUTO -Wchar-subscripts
 552 tryflag CFLAGS_AUTO -Wduplicate-decl-specifier
 553 tryflag CFLAGS_AUTO -Winit-self
 554 tryflag CFLAGS_AUTO -Wreturn-type
 555 tryflag CFLAGS_AUTO -Wsequence-point
 556 tryflag CFLAGS_AUTO -Wstrict-aliasing
 557 tryflag CFLAGS_AUTO -Wunused-function
 558 tryflag CFLAGS_AUTO -Wunused-label
 559 tryflag CFLAGS_AUTO -Wunused-variable
 560 fi
 561
 562 # Determine if the compiler produces position-independent code (PIC)
 563 # by default. If so, we don't need to compile separate object files
 564 # for libc.a and libc.so.
 565 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 566 pic_default=yes
 567 else
 568 pic_default=no
 569 fi
 570
 571 # Reduce space lost to padding for alignment purposes by sorting data
 572 # objects according to their alignment reqirements. This approximates
 573 # optimal packing.
 574 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 575 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 576
 577 # When linking shared library, drop dummy weak definitions that were
 578 # replaced by strong definitions from other translation units.
 579 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
 580
 581 # Some patched GCC builds have these defaults messed up...
 582 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 583
 584 # Prevent linking if there are undefined symbols; if any exist,
 585 # libc.so will crash at runtime during relocation processing.
 586 # The common way this can happen is failure to link the compiler
 587 # runtime library; implementation error is also a possibility.
 588 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 589
 590 # Avoid exporting symbols from compiler runtime libraries. They
 591 # should be hidden anyway, but some toolchains including old gcc
 592 # versions built without shared library support and pcc are broken.
 593 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 594
 595 # Public data symbols must be interposable to allow for copy
 596 # relocations, but otherwise we want to bind symbols at libc link
 597 # time to eliminate startup relocations and PLT overhead. Use
 598 # --dynamic-list rather than -Bsymbolic-functions for greater
 599 # control over what symbols are left unbound.
 600 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
 601
 602 # Find compiler runtime library
 603 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 604 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 605 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
 606                  && tryldflag LIBCC "$try_libcc"
 607 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 608                  && tryldflag LIBCC "$try_libcc"
 609 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 610
 611 # Figure out arch variants for archs with variants
 612 SUBARCH=
 613 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 614
 615 if test "$ARCH" = "i386" ; then
 616 printf "checking whether compiler can use ebx in PIC asm constraints... "
 617 cat > "$tmpc" <<EOF
 618 int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; }
 619 EOF
 620 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \
 621   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 622 printf "yes\n"
 623 else
 624 printf "no\n"
 625 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM"
 626 fi
 627 fi
 628
 629 if test "$ARCH" = "x86_64" ; then
 630 trycppif __ILP32__ "$t" && ARCH=x32
 631 fi
 632
 633 if test "$ARCH" = "arm" ; then
 634 if trycppif __thumb2__ "$t" ; then
 635 tryflag CFLAGS_AUTO -mimplicit-it=always
 636 tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
 637 tryflag CFLAGS_AUTO -Wa,-mthumb
 638 fi
 639 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 640 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 641 # Versions of clang up until at least 3.8 have the wrong constraint codes
 642 # for floating point operands to inline asm. Detect this so the affected
 643 # source files can just disable the asm.
 644 if test "$cc_family" = clang ; then
 645 printf "checking whether clang's vfp asm constraints work... "
 646 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
 647 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 648 printf "yes\n"
 649 else
 650 printf "no\n"
 651 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
 652 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 653 fi
 654 fi
 655 fi
 656
 657 if test "$ARCH" = "aarch64" ; then
 658 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
 659 fi
 660
 661 if test "$ARCH" = "m68k" ; then
 662 if trycppif "__HAVE_68881__" ; then : ;
 663 elif trycppif "__mcffpu__" ; then SUBARCH="-fp64"
 664 else SUBARCH="-sf"
 665 fi
 666 fi
 667
 668 if test "$ARCH" = "mips" ; then
 669 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 670 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 671 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 672 fi
 673
 674 if test "$ARCH" = "mips64" ; then
 675 trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
 676 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 677 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 678 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
 679 fi
 680
 681 if test "$ARCH" = "powerpc" ; then
 682 trycppif "_SOFT_FLOAT || __NO_FPRS__" "$t" && SUBARCH=${SUBARCH}-sf
 683 printf "checking whether compiler can use 'd' constraint in asm... "
 684 echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc"
 685 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 686 printf "yes\n"
 687 else
 688 printf "no\n"
 689 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM"
 690 CFLAGS_AUTO="${CFLAGS_AUTO# }"
 691 fi
 692 fi
 693
 694 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 695 && SUBARCH=${SUBARCH}el
 696
 697 if test "$ARCH" = "powerpc64" ; then
 698 trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
 699 trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
 700 trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
 701 fi
 702
 703 if test "$ARCH" = "riscv64" ; then
 704 trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf
 705 trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp
 706 fi
 707
 708 if test "$ARCH" = "sh" ; then
 709 tryflag CFLAGS_AUTO -Wa,--isa=any
 710 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 711 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 712 # Some sh configurations are broken and replace double with float
 713 # rather than using softfloat when the fpu is present but only
 714 # supports single precision. Reject them.
 715 printf "checking whether compiler's double type is IEEE double... "
 716 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
 717 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 718 printf "yes\n"
 719 else
 720 printf "no\n"
 721 fail "$0: error: compiler's floating point configuration is unsupported"
 722 fi
 723 else
 724 SUBARCH=${SUBARCH}-nofpu
 725 fi
 726 if trycppif __SH_FDPIC__ "$t" ; then
 727 SUBARCH=${SUBARCH}-fdpic
 728 fi
 729 fi
 730
 731 test "$SUBARCH" \
 732 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 733
 734 #
 735 # Some archs (powerpc) have different possible long double formats
 736 # that the compiler can be configured for. The logic for whether this
 737 # is supported is in bits/float.h; in general, it is not. We need to
 738 # check for mismatches here or code in printf, strotd, and scanf will
 739 # be dangerously incorrect because it depends on (1) the macros being
 740 # correct, and (2) IEEE semantics.
 741 #
 742 printf "checking whether compiler's long double definition matches float.h... "
 743 echo '#include <float.h>' > "$tmpc"
 744 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
 745 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
 746 if $CC $CFLAGS_C99FSE \
 747   -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
 748   $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 749 printf "yes\n"
 750 else
 751 printf "no\n"
 752 fail "$0: error: unsupported long double type"
 753 fi
 754
 755 #
 756 # Some build systems globally pass in broken CFLAGS like -ffast-math
 757 # for all packages. On recent GCC we can detect this and error out
 758 # early rather than producing a seriously-broken math library.
 759 #
 760 if trycppif "__FAST_MATH__" \
 761   "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 762 fail "$0: error: compiler has broken floating point; check CFLAGS"
 763 fi
 764
 765 printf "creating config.mak... "
 766
 767 cmdline=$(quote "$0")
 768 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 769
 770 exec 3>&1 1>config.mak
 771
 772
 773 cat << EOF
 774 # This version of config.mak was generated by:
 775 # $cmdline
 776 # Any changes made here will be lost if configure is re-run
 777 AR = ${AR:-\$(CROSS_COMPILE)ar}
 778 RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib}
 779 ARCH = $ARCH
 780 SUBARCH = $SUBARCH
 781 ASMSUBARCH = $ASMSUBARCH
 782 srcdir = $srcdir
 783 prefix = $prefix
 784 exec_prefix = $exec_prefix
 785 bindir = $bindir
 786 libdir = $libdir
 787 includedir = $includedir
 788 syslibdir = $syslibdir
 789 CC = $CC
 790 CFLAGS = $CFLAGS
 791 CFLAGS_AUTO = $CFLAGS_AUTO
 792 CFLAGS_C99FSE = $CFLAGS_C99FSE
 793 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 794 CFLAGS_NOSSP = $CFLAGS_NOSSP
 795 CPPFLAGS = $CPPFLAGS
 796 LDFLAGS = $LDFLAGS
 797 LDFLAGS_AUTO = $LDFLAGS_AUTO
 798 CROSS_COMPILE = $CROSS_COMPILE
 799 LIBCC = $LIBCC
 800 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 801 ALL_TOOLS = $tools
 802 TOOL_LIBS = $tool_libs
 803 ADD_CFI = $ADD_CFI
 804 MALLOC_DIR = $malloc_dir
 805 EOF
 806 test "x$static" = xno && echo "STATIC_LIBS ="
 807 test "x$shared" = xno && echo "SHARED_LIBS ="
 808 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
 809 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 810 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
 811 exec 1>&3 3>&-
 812
 813 test "$srcdir" = "." || ln -sf $srcdir/Makefile .
 814
 815 printf "done\n"