configure

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