configure

   1 #!/bin/sh
   2
   3 usage () {
   4 cat <<EOF
   5 Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
   6
   7 To assign environment variables (e.g., CC, CFLAGS...), specify them as
   8 VAR=VALUE.  See below for descriptions of some of the useful variables.
   9
  10 Defaults for the options are specified in brackets.
  11
  12 Installation directories:
  13   --prefix=PREFIX         main installation prefix [/usr/local/musl]
  14   --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
  15
  16 Fine tuning of the installation directories:
  17   --bindir=DIR            user executables [EPREFIX/bin]
  18   --libdir=DIR            library files for the linker [PREFIX/lib]
  19   --includedir=DIR        include files for the C compiler [PREFIX/include]
  20   --syslibdir=DIR         location for the dynamic linker [/lib]
  21
  22 System types:
  23   --target=TARGET         configure to run on target TARGET [detected]
  24   --host=HOST             same as --target
  25
  26 Optional features:
  27   --enable-optimize=...   optimize listed components for speed over size [auto]
  28   --enable-debug          build with debugging information [disabled]
  29   --enable-warnings       build with recommended warnings flags [disabled]
  30   --enable-gcc-wrapper    build musl-gcc toolchain wrapper [auto]
  31   --disable-shared        inhibit building shared library [enabled]
  32   --disable-static        inhibit building static library [enabled]
  33
  34 Some influential environment variables:
  35   CC                      C compiler command [detected]
  36   CFLAGS                  C compiler flags [-Os -pipe ...]
  37   CROSS_COMPILE           prefix for cross compiler and tools [none]
  38   LIBCC                   compiler runtime library [detected]
  39
  40 Use these variables to override the choices made by configure.
  41
  42 EOF
  43 exit 0
  44 }
  45
  46 # Helper functions
  47
  48 echo () { printf "%s\n" "$*" ; }
  49 fail () { echo "$*" ; exit 1 ; }
  50 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
  51 cmdexists () { type "$1" >/dev/null 2>&1 ; }
  52 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
  53
  54 stripdir () {
  55 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
  56 }
  57
  58 trycppif () {
  59 printf "checking preprocessor condition %s... " "$1"
  60 echo "typedef int x;" > "$tmpc"
  61 echo "#if $1" >> "$tmpc"
  62 echo "#error yes" >> "$tmpc"
  63 echo "#endif" >> "$tmpc"
  64 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  65 printf "false\n"
  66 return 1
  67 else
  68 printf "true\n"
  69 return 0
  70 fi
  71 }
  72
  73 tryflag () {
  74 printf "checking whether compiler accepts %s... " "$2"
  75 echo "typedef int x;" > "$tmpc"
  76 if $CC "$2" -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  77 printf "yes\n"
  78 eval "$1=\"\${$1} \$2\""
  79 eval "$1=\${$1# }"
  80 return 0
  81 else
  82 printf "no\n"
  83 return 1
  84 fi
  85 }
  86
  87 tryldflag () {
  88 printf "checking whether linker accepts %s... " "$2"
  89 echo "typedef int x;" > "$tmpc"
  90 if $CC -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
  91 printf "yes\n"
  92 eval "$1=\"\${$1} \$2\""
  93 eval "$1=\${$1# }"
  94 return 0
  95 else
  96 printf "no\n"
  97 return 1
  98 fi
  99 }
 100
 101
 102
 103 # Beginning of actual script
 104
 105 CFLAGS_C99FSE=
 106 CFLAGS_AUTO=
 107 LDFLAGS_AUTO=
 108 OPTIMIZE_GLOBS=
 109 prefix=/usr/local/musl
 110 exec_prefix='$(prefix)'
 111 bindir='$(exec_prefix)/bin'
 112 libdir='$(prefix)/lib'
 113 includedir='$(prefix)/include'
 114 syslibdir='/lib'
 115 target=
 116 optimize=auto
 117 debug=no
 118 warnings=no
 119 shared=yes
 120 static=yes
 121
 122 for arg ; do
 123 case "$arg" in
 124 --help) usage ;;
 125 --prefix=*) prefix=${arg#*=} ;;
 126 --exec-prefix=*) exec_prefix=${arg#*=} ;;
 127 --bindir=*) bindir=${arg#*=} ;;
 128 --libdir=*) libdir=${arg#*=} ;;
 129 --includedir=*) includedir=${arg#*=} ;;
 130 --syslibdir=*) syslibdir=${arg#*=} ;;
 131 --enable-shared|--enable-shared=yes) shared=yes ;;
 132 --disable-shared|--enable-shared=no) shared=no ;;
 133 --enable-static|--enable-static=yes) static=yes ;;
 134 --disable-static|--enable-static=no) static=no ;;
 135 --enable-optimize) optimize=yes ;;
 136 --enable-optimize=*) optimize=${arg#*=} ;;
 137 --disable-optimize) optimize=no ;;
 138 --enable-debug|--enable-debug=yes) debug=yes ;;
 139 --disable-debug|--enable-debug=no) debug=no ;;
 140 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 141 --disable-warnings|--enable-warnings=no) warnings=no ;;
 142 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
 143 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 144 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 145 --host=*|--target=*) target=${arg#*=} ;;
 146 -* ) echo "$0: unknown option $arg" ;;
 147 CC=*) CC=${arg#*=} ;;
 148 CFLAGS=*) CFLAGS=${arg#*=} ;;
 149 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
 150 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 151 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
 152 LIBCC=*) LIBCC=${arg#*=} ;;
 153 *=*) ;;
 154 *) target=$arg ;;
 155 esac
 156 done
 157
 158 for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
 159 stripdir $i
 160 done
 161
 162 #
 163 # Get a temp filename we can use
 164 #
 165 i=0
 166 set -C
 167 while : ; do i=$(($i+1))
 168 tmpc="./conf$$-$PPID-$i.c"
 169 2>|/dev/null > "$tmpc" && break
 170 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
 171 done
 172 set +C
 173 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
 174
 175 #
 176 # Find a C compiler to use
 177 #
 178 printf "checking for C compiler... "
 179 trycc ${CROSS_COMPILE}gcc
 180 trycc ${CROSS_COMPILE}c99
 181 trycc ${CROSS_COMPILE}cc
 182 printf "%s\n" "$CC"
 183 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 184
 185 #
 186 # Only build musl-gcc wrapper if toolchain does not already target musl
 187 #
 188 if test -z "$wrapper" ; then
 189 printf "checking whether compiler is gcc... "
 190 if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
 191 echo yes
 192 printf "checking whether to build musl-gcc wrapper... "
 193 wrapper=yes
 194 while read line ; do
 195 case "$line" in */ld-musl-*) wrapper=no ;; esac
 196 done <<EOF
 197 $($CC -dumpspecs)
 198 EOF
 199 echo $wrapper
 200 else
 201 echo no
 202 fi
 203 fi
 204
 205
 206
 207 #
 208 # Find the target architecture
 209 #
 210 printf "checking target system type... "
 211 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
 212 printf "%s\n" "$target"
 213
 214 #
 215 # Convert to just ARCH
 216 #
 217 case "$target" in
 218 arm*) ARCH=arm ;;
 219 i?86*) ARCH=i386 ;;
 220 x86_64*) ARCH=x86_64 ;;
 221 mips-*|mipsel-*) ARCH=mips ;;
 222 microblaze-*) ARCH=microblaze ;;
 223 powerpc-*) ARCH=powerpc ;;
 224 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
 225 *) fail "$0: unknown or unsupported target \"$target\"" ;;
 226 esac
 227
 228 #
 229 # Try to get a conforming C99 freestanding environment
 230 #
 231 tryflag CFLAGS_C99FSE -std=c99
 232 tryflag CFLAGS_C99FSE -nostdinc
 233 tryflag CFLAGS_C99FSE -ffreestanding \
 234 || tryflag CFLAGS_C99FSE -fno-builtin
 235 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
 236 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
 237 tryflag CFLAGS_C99FSE -frounding-math
 238
 239
 240 #
 241 # If debugging is explicitly enabled, don't auto-enable optimizations
 242 #
 243 if test "$debug" = yes ; then
 244 CFLAGS_AUTO=-g
 245 test "$optimize" = auto && optimize=no
 246 fi
 247
 248 #
 249 # Possibly add a -O option to CFLAGS and select modules to optimize with
 250 # -O3 based on the status of --enable-optimize and provided CFLAGS.
 251 #
 252 printf "checking for optimization settings... "
 253 case "x$optimize" in
 254 xauto)
 255 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
 256 printf "using provided CFLAGS\n" ;optimize=no
 257 else
 258 printf "using defaults\n" ; optimize=yes
 259 fi
 260 ;;
 261 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
 262 xno|x) printf "disabled\n" ; optimize=no ;;
 263 *) printf "custom\n" ;;
 264 esac
 265
 266 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
 267 test "$optimize" = yes && optimize="internal,malloc,string"
 268
 269 if fnmatch 'no|size' "$optimize" ; then :
 270 else
 271 printf "components to be optimized for speed:"
 272 while test "$optimize" ; do
 273 case "$optimize" in
 274 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
 275 *) this=$optimize optimize=
 276 esac
 277 printf " $this"
 278 case "$this" in
 279 */*.c) ;;
 280 */*) this=$this*.c ;;
 281 *) this=$this/*.c ;;
 282 esac
 283 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
 284 done
 285 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
 286 printf "\n"
 287 fi
 288
 289 # Always try -pipe
 290 tryflag CFLAGS_AUTO -pipe
 291
 292 #
 293 # If debugging is disabled, omit frame pointer. Modern GCC does this
 294 # anyway on most archs even when debugging is enabled since the frame
 295 # pointer is no longer needed for debugging.
 296 #
 297 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
 298 else
 299 tryflag CFLAGS_AUTO -fomit-frame-pointer
 300 fi
 301
 302 #
 303 # Modern GCC wants to put DWARF tables (used for debugging and
 304 # unwinding) in the loaded part of the program where they are
 305 # unstrippable. These options force them back to debug sections (and
 306 # cause them not to get generated at all if debugging is off).
 307 #
 308 tryflag CFLAGS_AUTO -fno-unwind-tables
 309 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 310
 311 #
 312 # The GNU toolchain defaults to assuming unmarked files need an
 313 # executable stack, potentially exposing vulnerabilities in programs
 314 # linked with such object files. Fix this.
 315 #
 316 tryflag CFLAGS_AUTO -Wa,--noexecstack
 317
 318 #
 319 # On x86, make sure we don't have incompatible instruction set
 320 # extensions enabled by default. This is bad for making static binaries.
 321 # We cheat and use i486 rather than i386 because i386 really does not
 322 # work anyway (issues with atomic ops).
 323 #
 324 if test "$ARCH" = "i386" ; then
 325 fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 326 fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 327 fi
 328
 329 #
 330 # Even with -std=c99, gcc accepts some constructs which are constraint
 331 # violations. We want to treat these as errors regardless of whether
 332 # other purely stylistic warnings are enabled -- especially implicit
 333 # function declarations, which are a dangerous programming error.
 334 #
 335 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
 336 tryflag CFLAGS_AUTO -Werror=implicit-int
 337 tryflag CFLAGS_AUTO -Werror=pointer-sign
 338 tryflag CFLAGS_AUTO -Werror=pointer-arith
 339
 340 if test "x$warnings" = xyes ; then
 341 tryflag CFLAGS_AUTO -Wall
 342 tryflag CFLAGS_AUTO -Wcast-align
 343 tryflag CFLAGS_AUTO -Wno-parentheses
 344 tryflag CFLAGS_AUTO -Wno-uninitialized
 345 tryflag CFLAGS_AUTO -Wno-missing-braces
 346 tryflag CFLAGS_AUTO -Wno-unused-value
 347 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
 348 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 349 fi
 350
 351 # Some patched GCC builds have these defaults messed up...
 352 tryflag CFLAGS_AUTO -fno-stack-protector
 353 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 354
 355 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 356 LDFLAGS_DUMMY=
 357 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
 358 printf "warning: disabling dynamic linking support\n"
 359 shared=no
 360 }
 361
 362 # Find compiler runtime library
 363 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 364 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 365 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
 366                  && tryldflag LIBCC "$try_libcc"
 367 printf "using compiler runtime libraries: %s\n" "$LIBCC"
 368
 369 # Figure out arch variants for archs with variants
 370 SUBARCH=
 371 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS_AUTO $CFLAGS"
 372
 373 if test "$ARCH" = "arm" ; then
 374 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 375 trycppif __SOFTFP__ "$t" || SUBARCH=${SUBARCH}hf
 376 fi
 377
 378 test "$ARCH" = "mips" && trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" \
 379 && SUBARCH=${SUBARCH}el
 380
 381 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 382 && SUBARCH=${SUBARCH}el
 383
 384 test "$SUBARCH" \
 385 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
 386
 387 printf "creating config.mak... "
 388
 389 exec 3>&1 1>config.mak
 390
 391
 392 cat << EOF
 393 # This version of config.mak was generated by configure
 394 # Any changes made here will be lost if configure is re-run
 395 ARCH = $ARCH
 396 SUBARCH = $SUBARCH
 397 prefix = $prefix
 398 exec_prefix = $exec_prefix
 399 bindir = $bindir
 400 libdir = $libdir
 401 includedir = $includedir
 402 syslibdir = $syslibdir
 403 CC = $CC
 404 CFLAGS= $CFLAGS_AUTO $CFLAGS
 405 CFLAGS_C99FSE = $CFLAGS_C99FSE
 406 CPPFLAGS = $CPPFLAGS
 407 LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
 408 CROSS_COMPILE = $CROSS_COMPILE
 409 LIBCC = $LIBCC
 410 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
 411 EOF
 412 test "x$static" = xno && echo "STATIC_LIBS ="
 413 test "x$shared" = xno && echo "SHARED_LIBS ="
 414 test "x$wrapper" = xno && echo "ALL_TOOLS ="
 415 test "x$wrapper" = xno && echo "TOOL_LIBS ="
 416 exec 1>&3 3>&-
 417
 418 printf "done\n"