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