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 Installation directories:
  13   --prefix=PREFIX         main installation prefix [/usr/local/musl]
  14   --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
  15
  16 Fine tuning of the installation directories:
  17   --bindir=DIR            user executables [EPREFIX/bin]
  18   --libdir=DIR            library files for the linker [PREFIX/lib]
  19   --includedir=DIR        include files for the C compiler [PREFIX/include]
  20   --syslibdir=DIR         location for the dynamic linker [/lib]
  21
  22 System types:
  23   --target=TARGET         configure to run on target TARGET [detected]
  24   --host=HOST             same as --target
  25
  26 Optional features:
  27   --enable-optimize=...   optimize listed components for speed over size [auto]
  28   --enable-debug          build with debugging information [disabled]
  29   --enable-warnings       build with recommended warnings flags [disabled]
  30   --enable-gcc-wrapper    build musl-gcc toolchain wrapper [auto]
  31   --disable-shared        inhibit building shared library [enabled]
  32   --disable-static        inhibit building static library [enabled]
  33
  34 Some influential environment variables:
  35   CC                      C compiler command [detected]
  36   CFLAGS                  C compiler flags [-Os -pipe ...]
  37   CROSS_COMPILE           prefix for cross compiler and tools [none]
  38   LIBCC                   compiler runtime library [detected]
  39
  40 Use these variables to override the choices made by configure.
  41
  42 EOF
  43 exit 0
  44 }
  45
  46 # Helper functions
  47
  48 quote () {
  49 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
  50 $1
  51 EOF
  52 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
  53 }
  54 echo () { printf "%s\n" "$*" ; }
  55 fail () { echo "$*" ; exit 1 ; }
  56 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  57 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  58 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  59
  60 stripdir () {
  61 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  62 }
  63
  64 trycppif () {
  65 printf "checking preprocessor condition %s... " "$1"
  66 echo "typedef int x;" > "$tmpc"
  67 echo "#if $1" >> "$tmpc"
  68 echo "#error yes" >> "$tmpc"
  69 echo "#endif" >> "$tmpc"
  70 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  71 printf "false\n"
  72 return 1
  73 else
  74 printf "true\n"
  75 return 0
  76 fi
  77 }
  78
  79 tryflag () {
  80 printf "checking whether compiler accepts %s... " "$2"
  81 echo "typedef int x;" > "$tmpc"
  82 if $CC "$2" -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  83 printf "yes\n"
  84 eval "$1=\"\${$1} \$2\""
  85 eval "$1=\${$1# }"
  86 return 0
  87 else
  88 printf "no\n"
  89 return 1
  90 fi
  91 }
  92
  93 tryldflag () {
  94 printf "checking whether linker accepts %s... " "$2"
  95 echo "typedef int x;" > "$tmpc"
  96 if $CC -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  97 printf "yes\n"
  98 eval "$1=\"\${$1} \$2\""
  99 eval "$1=\${$1# }"
 100 return 0
 101 else
 102 printf "no\n"
 103 return 1
 104 fi
 105 }
 106
 107
 108
 109 # Beginning of actual script
 110
 111 CFLAGS_C99FSE=
 112 CFLAGS_AUTO=
 113 CFLAGS_MEMOPS=
 114 LDFLAGS_AUTO=
 115 OPTIMIZE_GLOBS=
 116 prefix=/usr/local/musl
 117 exec_prefix='$(prefix)'
 118 bindir='$(exec_prefix)/bin'
 119 libdir='$(prefix)/lib'
 120 includedir='$(prefix)/include'
 121 syslibdir='/lib'
 122 target=
 123 optimize=auto
 124 debug=no
 125 warnings=no
 126 shared=yes
 127 static=yes
 128
 129 for arg ; do
 130 case "$arg" in
 131 --help) usage ;;
 132 --prefix=*) prefix=${arg#*=} ;;
 133 --exec-prefix=*) exec_prefix=${arg#*=} ;;
 134 --bindir=*) bindir=${arg#*=} ;;
 135 --libdir=*) libdir=${arg#*=} ;;
 136 --includedir=*) includedir=${arg#*=} ;;
 137 --syslibdir=*) syslibdir=${arg#*=} ;;
 138 --enable-shared|--enable-shared=yes) shared=yes ;;
 139 --disable-shared|--enable-shared=no) shared=no ;;
 140 --enable-static|--enable-static=yes) static=yes ;;
 141 --disable-static|--enable-static=no) static=no ;;
 142 --enable-optimize) optimize=yes ;;
 143 --enable-optimize=*) optimize=${arg#*=} ;;
 144 --disable-optimize) optimize=no ;;
 145 --enable-debug|--enable-debug=yes) debug=yes ;;
 146 --disable-debug|--enable-debug=no) debug=no ;;
 147 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 148 --disable-warnings|--enable-warnings=no) warnings=no ;;
 149 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
 150 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 151 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 152 --host=*|--target=*) target=${arg#*=} ;;
 153 -* ) echo "$0: unknown option $arg" ;;
 154 CC=*) CC=${arg#*=} ;;
 155 CFLAGS=*) CFLAGS=${arg#*=} ;;
 156 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 157 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 158 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 159 LIBCC=*) LIBCC=${arg#*=} ;;
 160 *=*) ;;
 161 *) target=$arg ;;
 162 esac
 163 done
 164
 165 for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
 166 stripdir $i
 167 done
 168
 169 #
 170 # Get a temp filename we can use
 171 #
 172 i=0
 173 set -C
 174 while : ; do i=$(($i+1))
 175 tmpc="./conf$$-$PPID-$i.c"
 176 2>|/dev/null > "$tmpc" && break
 177 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 178 done
 179 set +C
 180 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 181
 182 #
 183 # Find a C compiler to use
 184 #
 185 printf "checking for C compiler... "
 186 trycc ${CROSS_COMPILE}gcc
 187 trycc ${CROSS_COMPILE}c99
 188 trycc ${CROSS_COMPILE}cc
 189 printf "%s\n" "$CC"
 190 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 191
 192 #
 193 # Only build musl-gcc wrapper if toolchain does not already target musl
 194 #
 195 if test -z "$wrapper" ; then
 196 printf "checking whether compiler is gcc... "
 197 if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
 198 echo yes
 199 printf "checking whether to build musl-gcc wrapper... "
 200 wrapper=yes
 201 while read line ; do
 202 case "$line" in */ld-musl-*) wrapper=no ;; esac
 203 done <<EOF
 204 $($CC -dumpspecs)
 205 EOF
 206 echo $wrapper
 207 else
 208 echo no
 209 fi
 210 fi
 211
 212
 213
 214 #
 215 # Find the target architecture
 216 #
 217 printf "checking target system type... "
 218 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 219 printf "%s\n" "$target"
 220
 221 #
 222 # Convert to just ARCH
 223 #
 224 case "$target" in
 225 arm*) ARCH=arm ;;
 226 i?86*) ARCH=i386 ;;
 227 x86_64*) ARCH=x86_64 ;;
 228 mips-*|mipsel-*) ARCH=mips ;;
 229 microblaze-*) ARCH=microblaze ;;
 230 powerpc-*) ARCH=powerpc ;;
 231 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 232 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 233 esac
 234
 235 #
 236 # Try to get a conforming C99 freestanding environment
 237 #
 238 tryflag CFLAGS_C99FSE -std=c99
 239 tryflag CFLAGS_C99FSE -nostdinc
 240 tryflag CFLAGS_C99FSE -ffreestanding \
 241 || tryflag CFLAGS_C99FSE -fno-builtin
 242 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 243 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 244 tryflag CFLAGS_C99FSE -frounding-math
 245
 246 #
 247 # We may use the may_alias attribute if __GNUC__ is defined, so
 248 # if the compiler defines __GNUC__ but does not provide it,
 249 # it must be defined away as part of the CFLAGS.
 250 #
 251 printf "checking whether compiler needs attribute((may_alias)) suppression... "
 252 cat > "$tmpc" <<EOF
 253 typedef int
 254 #ifdef __GNUC__
 255 __attribute__((__may_alias__))
 256 #endif
 257 x;
 258 EOF
 259 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
 260   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 261 printf "no\n"
 262 else
 263 printf "yes\n"
 264 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 265 fi
 266
 267 #
 268 # Check for options that may be needed to prevent the compiler from
 269 # generating self-referential versions of memcpy,, memmove, memcmp,
 270 # and memset. Really, we should add a check to determine if this
 271 # option is sufficient, and if not, add a macro to cripple these
 272 # functions with volatile...
 273 #
 274 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 275
 276 #
 277 # If debugging is explicitly enabled, don't auto-enable optimizations
 278 #
 279 if test "$debug" = yes ; then
 280 CFLAGS_AUTO=-g
 281 test "$optimize" = auto && optimize=no
 282 fi
 283
 284 #
 285 # Possibly add a -O option to CFLAGS and select modules to optimize with
 286 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 287 #
 288 printf "checking for optimization settings... "
 289 case "x$optimize" in
 290 xauto)
 291 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 292 printf "using provided CFLAGS\n" ;optimize=no
 293 else
 294 printf "using defaults\n" ; optimize=yes
 295 fi
 296 ;;
 297 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 298 xno|x) printf "disabled\n" ; optimize=no ;;
 299 *) printf "custom\n" ;;
 300 esac
 301
 302 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 303 test "$optimize" = yes && optimize="internal,malloc,string"
 304
 305 if fnmatch 'no|size' "$optimize" ; then :
 306 else
 307 printf "components to be optimized for speed:"
 308 while test "$optimize" ; do
 309 case "$optimize" in
 310 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 311 *) this=$optimize optimize=
 312 esac
 313 printf " $this"
 314 case "$this" in
 315 */*.c) ;;
 316 */*) this=$this*.c ;;
 317 *) this=$this/*.c ;;
 318 esac
 319 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 320 done
 321 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 322 printf "\n"
 323 fi
 324
 325 # Always try -pipe
 326 tryflag CFLAGS_AUTO -pipe
 327
 328 #
 329 # If debugging is disabled, omit frame pointer. Modern GCC does this
 330 # anyway on most archs even when debugging is enabled since the frame
 331 # pointer is no longer needed for debugging.
 332 #
 333 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 334 else
 335 tryflag CFLAGS_AUTO -fomit-frame-pointer
 336 fi
 337
 338 #
 339 # Modern GCC wants to put DWARF tables (used for debugging and
 340 # unwinding) in the loaded part of the program where they are
 341 # unstrippable. These options force them back to debug sections (and
 342 # cause them not to get generated at all if debugging is off).
 343 #
 344 tryflag CFLAGS_AUTO -fno-unwind-tables
 345 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 346
 347 #
 348 # The GNU toolchain defaults to assuming unmarked files need an
 349 # executable stack, potentially exposing vulnerabilities in programs
 350 # linked with such object files. Fix this.
 351 #
 352 tryflag CFLAGS_AUTO -Wa,--noexecstack
 353
 354 #
 355 # On x86, make sure we don't have incompatible instruction set
 356 # extensions enabled by default. This is bad for making static binaries.
 357 # We cheat and use i486 rather than i386 because i386 really does not
 358 # work anyway (issues with atomic ops).
 359 #
 360 if test "$ARCH" = "i386" ; then
 361 fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 362 fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 363 fi
 364
 365 #
 366 # Even with -std=c99, gcc accepts some constructs which are constraint
 367 # violations. We want to treat these as errors regardless of whether
 368 # other purely stylistic warnings are enabled -- especially implicit
 369 # function declarations, which are a dangerous programming error.
 370 #
 371 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 372 tryflag CFLAGS_AUTO -Werror=implicit-int
 373 tryflag CFLAGS_AUTO -Werror=pointer-sign
 374 tryflag CFLAGS_AUTO -Werror=pointer-arith
 375
 376 if test "x$warnings" = xyes ; then
 377 tryflag CFLAGS_AUTO -Wall
 378 tryflag CFLAGS_AUTO -Wno-parentheses
 379 tryflag CFLAGS_AUTO -Wno-uninitialized
 380 tryflag CFLAGS_AUTO -Wno-missing-braces
 381 tryflag CFLAGS_AUTO -Wno-unused-value
 382 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 383 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 384 fi
 385
 386 # Some patched GCC builds have these defaults messed up...
 387 tryflag CFLAGS_AUTO -fno-stack-protector
 388 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 389
 390 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 391 LDFLAGS_DUMMY=
 392 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
 393 printf "warning: disabling dynamic linking support\n"
 394 shared=no
 395 }
 396
 397 # Find compiler runtime library
 398 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 399 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 400 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 401                  && tryldflag LIBCC "$try_libcc"
 402 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 403
 404 # Figure out arch variants for archs with variants
 405 SUBARCH=
 406 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS_AUTO $CFLAGS"
 407
 408 if test "$ARCH" = "arm" ; then
 409 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 410 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 411 fi
 412
 413 test "$ARCH" = "mips" && trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" \
 414 && SUBARCH=${SUBARCH}el
 415
 416 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 417 && SUBARCH=${SUBARCH}el
 418
 419 test "$SUBARCH" \
 420 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 421
 422 case "$ARCH$SUBARCH" in
 423 arm) ASMSUBARCH=el ;;
 424 *) ASMSUBARCH=$SUBARCH ;;
 425 esac
 426
 427 #
 428 # Some archs (powerpc) have different possible long double formats
 429 # that the compiler can be configured for. The logic for whether this
 430 # is supported is in bits/float.h; in general, it is not. We need to
 431 # check for mismatches here or code in printf, strotd, and scanf will
 432 # be dangerously incorrect because it depends on (1) the macros being
 433 # correct, and (2) IEEE semantics.
 434 #
 435 printf "checking whether compiler's long double definition matches float.h... "
 436 echo '#include <float.h>' > "$tmpc"
 437 echo '#if LDBL_MANT_DIG == 53' >> "$tmpc"
 438 echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc"
 439 echo '#endif' >> "$tmpc"
 440 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
 441   -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 442 printf "yes\n"
 443 else
 444 printf "no\n"
 445 fail "$0: error: unsupported long double type"
 446 fi
 447
 448 printf "creating config.mak... "
 449
 450 cmdline=$(quote "$0")
 451 for i ; do cmdline="$cmdline $(quote "$i")" ; done
 452
 453 exec 3>&1 1>config.mak
 454
 455
 456 cat << EOF
 457 # This version of config.mak was generated by:
 458 # $cmdline
 459 # Any changes made here will be lost if configure is re-run
 460 ARCH = $ARCH
 461 SUBARCH = $SUBARCH
 462 ASMSUBARCH = $ASMSUBARCH
 463 prefix = $prefix
 464 exec_prefix = $exec_prefix
 465 bindir = $bindir
 466 libdir = $libdir
 467 includedir = $includedir
 468 syslibdir = $syslibdir
 469 CC = $CC
 470 CFLAGS= $CFLAGS_AUTO $CFLAGS
 471 CFLAGS_C99FSE = $CFLAGS_C99FSE
 472 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
 473 CPPFLAGS = $CPPFLAGS
 474 LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
 475 CROSS_COMPILE = $CROSS_COMPILE
 476 LIBCC = $LIBCC
 477 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 478 EOF
 479 test "x$static" = xno && echo "STATIC_LIBS ="
 480 test "x$shared" = xno && echo "SHARED_LIBS ="
 481 test "x$wrapper" = xno && echo "ALL_TOOLS ="
 482 test "x$wrapper" = xno && echo "TOOL_LIBS ="
 483 exec 1>&3 3>&-
 484
 485 printf "done\n"