1#!/bin/sh 2 3usage () { 4cat <<EOF 5Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET] 6 7To assign environment variables (e.g., CC, CFLAGS...), specify them as 8VAR=VALUE. See below for descriptions of some of the useful variables. 9 10Defaults for the options are specified in brackets. 11 12Configuration: 13 --srcdir=DIR source directory [detected] 14 15Installation directories: 16 --prefix=PREFIX main installation prefix [/usr/local/musl] 17 --exec-prefix=EPREFIX installation prefix for executable files [PREFIX] 18 19Fine 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 25System 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 30Optional 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 38Optional packages: 39 --with-malloc=... choose malloc implementation [mallocng] 40 41Some 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 47Use these variables to override the choices made by configure. 48 49EOF 50exit 0 51} 52 53# Helper functions 54 55quote () { 56tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; } 57$1 58EOF 59printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" 60} 61echo () { printf "%s\n" "$*" ; } 62fail () { echo "$*" ; exit 1 ; } 63fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; } 64cmdexists () { type "$1" >/dev/null 2>&1 ; } 65trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; } 66 67stripdir () { 68while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done 69} 70 71trycppif () { 72printf "checking preprocessor condition %s... " "$1" 73echo "typedef int x;" > "$tmpc" 74echo "#if $1" >> "$tmpc" 75echo "#error yes" >> "$tmpc" 76echo "#endif" >> "$tmpc" 77if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 78printf "false\n" 79return 1 80else 81printf "true\n" 82return 0 83fi 84} 85 86tryflag () { 87printf "checking whether compiler accepts %s... " "$2" 88echo "typedef int x;" > "$tmpc" 89if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 90printf "yes\n" 91eval "$1=\"\${$1} \$2\"" 92eval "$1=\${$1# }" 93return 0 94else 95printf "no\n" 96return 1 97fi 98} 99 100tryldflag () { 101printf "checking whether linker accepts %s... " "$2" 102echo "typedef int x;" > "$tmpc" 103if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 104printf "yes\n" 105eval "$1=\"\${$1} \$2\"" 106eval "$1=\${$1# }" 107return 0 108else 109printf "no\n" 110return 1 111fi 112} 113 114 115 116# Beginning of actual script 117 118CFLAGS_C99FSE= 119CFLAGS_AUTO= 120CFLAGS_MEMOPS= 121CFLAGS_NOSSP= 122CFLAGS_TRY= 123LDFLAGS_AUTO= 124LDFLAGS_TRY= 125OPTIMIZE_GLOBS= 126srcdir= 127prefix=/usr/local/musl 128exec_prefix='$(prefix)' 129bindir='$(exec_prefix)/bin' 130libdir='$(prefix)/lib' 131includedir='$(prefix)/include' 132syslibdir='/lib' 133tools= 134tool_libs= 135build= 136target= 137optimize=auto 138debug=no 139warnings=yes 140shared=auto 141static=yes 142wrapper=auto 143gcc_wrapper=no 144clang_wrapper=no 145malloc_dir=mallocng 146 147for arg ; do 148case "$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 $arg" ;; 180AR=*) AR=${arg#*=} ;; 181RANLIB=*) RANLIB=${arg#*=} ;; 182CC=*) CC=${arg#*=} ;; 183CFLAGS=*) CFLAGS=${arg#*=} ;; 184CPPFLAGS=*) CPPFLAGS=${arg#*=} ;; 185LDFLAGS=*) LDFLAGS=${arg#*=} ;; 186CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;; 187LIBCC=*) LIBCC=${arg#*=} ;; 188*=*) ;; 189*) build=$arg ; target=$arg ;; 190esac 191done 192 193for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do 194stripdir $i 195done 196 197# 198# Get the source dir for out-of-tree builds 199# 200if test -z "$srcdir" ; then 201srcdir="${0%/configure}" 202stripdir srcdir 203fi 204abs_builddir="$(pwd)" || fail "$0: cannot determine working directory" 205abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir" 206test "$abs_srcdir" = "$abs_builddir" && srcdir=. 207test "$srcdir" != "." && test -f Makefile && test ! -h Makefile && fail "$0: Makefile already exists in the working directory" 208 209# 210# Get a temp filename we can use 211# 212i=0 213set -C 214while : ; do i=$(($i+1)) 215tmpc="./conf$$-$PPID-$i.c" 2162>|/dev/null > "$tmpc" && break 217test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc" 218done 219set +C 220trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP 221 222# 223# Check that the requested malloc implementation exists 224# 225test -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# 232test "$target" && \ 233test "$target" != "$build" && \ 234test -z "$CROSS_COMPILE" && \ 235CROSS_COMPILE="$target-" 236 237# 238# Find a C compiler to use 239# 240printf "checking for C compiler... " 241trycc ${CROSS_COMPILE}gcc 242trycc ${CROSS_COMPILE}c99 243trycc ${CROSS_COMPILE}cc 244printf "%s\n" "$CC" 245test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; } 246 247printf "checking whether C compiler works... " 248echo "typedef int x;" > "$tmpc" 249if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then 250printf "yes\n" 251else 252printf "no; compiler output follows:\n%s\n" "$output" 253exit 1 254fi 255 256# 257# Figure out options to force errors on unknown flags. 258# 259tryflag CFLAGS_TRY -Werror=unknown-warning-option 260tryflag CFLAGS_TRY -Werror=unused-command-line-argument 261tryflag CFLAGS_TRY -Werror=ignored-optimization-argument 262tryldflag LDFLAGS_TRY -Werror=unknown-warning-option 263tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument 264 265# 266# Need to know if the compiler is gcc or clang to decide which toolchain 267# wrappers to build. 268# 269printf "checking for C compiler family... " 270cc_ver="$(LC_ALL=C $CC -v 2>&1)" 271cc_family=unknown 272if fnmatch '*gcc\ version*' "$cc_ver" ; then 273cc_family=gcc 274elif fnmatch '*clang\ version*' "$cc_ver" ; then 275cc_family=clang 276fi 277echo "$cc_family" 278 279# 280# Figure out toolchain wrapper to build 281# 282if test "$wrapper" = auto || test "$wrapper" = detect ; then 283echo "#include <stdlib.h>" > "$tmpc" 284echo "#if ! __GLIBC__" >> "$tmpc" 285echo "#error no" >> "$tmpc" 286echo "#endif" >> "$tmpc" 287printf "checking for toolchain wrapper to build... " 288if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 289echo "none" 290elif test "$cc_family" = gcc ; then 291gcc_wrapper=yes 292echo "gcc" 293elif test "$cc_family" = clang ; then 294clang_wrapper=yes 295echo "clang" 296else 297echo "none" 298if test "$wrapper" = detect ; then 299fail "$0: could not find an appropriate toolchain wrapper" 300fi 301fi 302fi 303 304if test "$gcc_wrapper" = yes ; then 305tools="$tools obj/musl-gcc" 306tool_libs="$tool_libs lib/musl-gcc.specs" 307fi 308if test "$clang_wrapper" = yes ; then 309tools="$tools obj/musl-clang obj/ld.musl-clang" 310fi 311 312# 313# Find the target architecture 314# 315printf "checking target system type... " 316test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown 317printf "%s\n" "$target" 318 319# 320# Convert to just ARCH 321# 322case "$target" in 323# Catch these early to simplify matching for 32-bit archs 324arm*) ARCH=arm ;; 325aarch64*) ARCH=aarch64 ;; 326i?86-nt32*) ARCH=nt32 ;; 327i?86*) ARCH=i386 ;; 328x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;; 329x86_64-nt64*) ARCH=nt64 ;; 330x86_64*) ARCH=x86_64 ;; 331m68k*) ARCH=m68k ;; 332mips64*|mipsisa64*) ARCH=mips64 ;; 333mips*) ARCH=mips ;; 334microblaze*) ARCH=microblaze ;; 335or1k*) ARCH=or1k ;; 336powerpc64*|ppc64*) ARCH=powerpc64 ;; 337powerpc*|ppc*) ARCH=powerpc ;; 338riscv64*) ARCH=riscv64 ;; 339sh[1-9bel-]*|sh|superh*) ARCH=sh ;; 340s390x*) ARCH=s390x ;; 341unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; 342*) fail "$0: unknown or unsupported target \"$target\"" ;; 343esac 344 345# 346# Try to get a conforming C99 freestanding environment 347# 348tryflag CFLAGS_C99FSE -std=c99 349tryflag CFLAGS_C99FSE -nostdinc 350tryflag CFLAGS_C99FSE -ffreestanding \ 351|| tryflag CFLAGS_C99FSE -fno-builtin 352tryflag CFLAGS_C99FSE -fexcess-precision=standard \ 353|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } 354tryflag CFLAGS_C99FSE -frounding-math 355 356# 357# We may use the may_alias attribute if __GNUC__ is defined, so 358# if the compiler defines __GNUC__ but does not provide it, 359# it must be defined away as part of the CFLAGS. 360# 361printf "checking whether compiler needs attribute((may_alias)) suppression... " 362cat > "$tmpc" <<EOF 363typedef int 364#ifdef __GNUC__ 365__attribute__((__may_alias__)) 366#endif 367x; 368EOF 369if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ 370 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 371printf "no\n" 372else 373printf "yes\n" 374CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" 375fi 376 377# 378# The GNU toolchain defaults to assuming unmarked files need an 379# executable stack, potentially exposing vulnerabilities in programs 380# linked with such object files. Fix this. 381# 382tryflag CFLAGS_C99FSE -Wa,--noexecstack 383 384# 385# Check for options to disable stack protector, which needs to be 386# disabled for a few early-bootstrap translation units. If not found, 387# this is not an error; we assume the toolchain does not do ssp. 388# 389tryflag CFLAGS_NOSSP -fno-stack-protector 390 391# 392# Check for options that may be needed to prevent the compiler from 393# generating self-referential versions of memcpy,, memmove, memcmp, 394# and memset. Really, we should add a check to determine if this 395# option is sufficient, and if not, add a macro to cripple these 396# functions with volatile... 397# 398tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns 399 400# 401# Enable debugging if requessted. 402# 403test "$debug" = yes && CFLAGS_AUTO=-g 404 405# 406# Preprocess asm files to add extra debugging information if debug is 407# enabled, our assembler supports the needed directives, and the 408# preprocessing script has been written for our architecture. 409# 410printf "checking whether we should preprocess assembly to add debugging information... " 411if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" && 412 test -f "$srcdir/tools/add-cfi.$ARCH.awk" && 413 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null - 414then 415 ADD_CFI=yes 416else 417 ADD_CFI=no 418fi 419printf "%s\n" "$ADD_CFI" 420 421# 422# Possibly add a -O option to CFLAGS and select modules to optimize with 423# -O3 based on the status of --enable-optimize and provided CFLAGS. 424# 425printf "checking for optimization settings... " 426case "x$optimize" in 427xauto) 428if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then 429printf "using provided CFLAGS\n" ;optimize=no 430else 431printf "using defaults\n" ; optimize=yes 432fi 433;; 434xsize|xnone) printf "minimize size\n" ; optimize=size ;; 435xno|x) printf "disabled\n" ; optimize=no ;; 436*) printf "custom\n" ;; 437esac 438 439test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2 440test "$optimize" = yes && optimize="internal,malloc,string" 441 442if fnmatch 'no|size' "$optimize" ; then : 443else 444printf "components to be optimized for speed:" 445while test "$optimize" ; do 446case "$optimize" in 447*,*) this=${optimize%%,*} optimize=${optimize#*,} ;; 448*) this=$optimize optimize= 449esac 450printf " $this" 451case "$this" in 452*/*.c) ;; 453*/*) this=$this*.c ;; 454*) this=$this/*.c ;; 455esac 456OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" 457done 458OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } 459printf "\n" 460fi 461 462# Always try -pipe 463tryflag CFLAGS_AUTO -pipe 464 465# 466# If debugging is disabled, omit frame pointer. Modern GCC does this 467# anyway on most archs even when debugging is enabled since the frame 468# pointer is no longer needed for debugging. 469# 470if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : 471else 472tryflag CFLAGS_AUTO -fomit-frame-pointer 473fi 474 475# 476# Modern GCC wants to put DWARF tables (used for debugging and 477# unwinding) in the loaded part of the program where they are 478# unstrippable. These options force them back to debug sections (and 479# cause them not to get generated at all if debugging is off). 480# 481tryflag CFLAGS_AUTO -fno-unwind-tables 482tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables 483 484# 485# Attempt to put each function and each data object in its own 486# section. This both allows additional size optimizations at link 487# time and works around a dangerous class of compiler/assembler bugs 488# whereby relative address expressions are constant-folded by the 489# assembler even when one or more of the symbols involved is 490# replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc. 491# 492tryflag CFLAGS_AUTO -ffunction-sections 493tryflag CFLAGS_AUTO -fdata-sections 494 495# 496# On x86, make sure we don't have incompatible instruction set 497# extensions enabled by default. This is bad for making static binaries. 498# We cheat and use i486 rather than i386 because i386 really does not 499# work anyway (issues with atomic ops). 500# Some build environments pass -march and -mtune options via CC, so 501# check both CC and CFLAGS. 502# 503if test "$ARCH" = "i386" ; then 504fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 505fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic 506fi 507 508# 509# GCC defines -w as overriding any -W options, regardless of order, but 510# clang has a bunch of annoying warnings enabled by default and needs -w 511# to start from a clean slate. So use -w if building with clang. Also 512# turn off a common on-by-default cast warning regardless of compiler. 513# 514test "$cc_family" = clang && tryflag CFLAGS_AUTO -w 515 516tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast 517 518# 519# Even with -std=c99, gcc accepts some constructs which are constraint 520# violations. We want to treat these as errors regardless of whether 521# other purely stylistic warnings are enabled -- especially implicit 522# function declarations, which are a dangerous programming error. 523# 524tryflag CFLAGS_AUTO -Werror=implicit-function-declaration 525tryflag CFLAGS_AUTO -Werror=implicit-int 526tryflag CFLAGS_AUTO -Werror=pointer-sign 527tryflag CFLAGS_AUTO -Werror=pointer-arith 528tryflag CFLAGS_AUTO -Werror=int-conversion 529tryflag CFLAGS_AUTO -Werror=incompatible-pointer-types 530tryflag CFLAGS_AUTO -Werror=discarded-qualifiers 531tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers 532 533# 534# GCC ignores unused arguements by default, but Clang needs this extra 535# parameter to stop printing warnings about LDFLAGS passed during 536# compiling stage and CFLAGS passed during linking stage. 537# 538test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments 539 540if test "x$warnings" = xyes ; then 541tryflag CFLAGS_AUTO -Waddress 542tryflag CFLAGS_AUTO -Warray-bounds 543tryflag CFLAGS_AUTO -Wchar-subscripts 544tryflag CFLAGS_AUTO -Wduplicate-decl-specifier 545tryflag CFLAGS_AUTO -Winit-self 546tryflag CFLAGS_AUTO -Wreturn-type 547tryflag CFLAGS_AUTO -Wsequence-point 548tryflag CFLAGS_AUTO -Wstrict-aliasing 549tryflag CFLAGS_AUTO -Wunused-function 550tryflag CFLAGS_AUTO -Wunused-label 551tryflag CFLAGS_AUTO -Wunused-variable 552fi 553 554# Determine if the compiler produces position-independent code (PIC) 555# by default. If so, we don't need to compile separate object files 556# for libc.a and libc.so. 557if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then 558pic_default=yes 559else 560pic_default=no 561fi 562 563# Reduce space lost to padding for alignment purposes by sorting data 564# objects according to their alignment reqirements. This approximates 565# optimal packing. 566tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment 567tryldflag LDFLAGS_AUTO -Wl,--sort-common 568 569# When linking shared library, drop dummy weak definitions that were 570# replaced by strong definitions from other translation units. 571tryldflag LDFLAGS_AUTO -Wl,--gc-sections 572 573# Some patched GCC builds have these defaults messed up... 574tryldflag LDFLAGS_AUTO -Wl,--hash-style=both 575 576# Prevent linking if there are undefined symbols; if any exist, 577# libc.so will crash at runtime during relocation processing. 578# The common way this can happen is failure to link the compiler 579# runtime library; implementation error is also a possibility. 580tryldflag LDFLAGS_AUTO -Wl,--no-undefined 581 582# Avoid exporting symbols from compiler runtime libraries. They 583# should be hidden anyway, but some toolchains including old gcc 584# versions built without shared library support and pcc are broken. 585tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL 586 587# Public data symbols must be interposable to allow for copy 588# relocations, but otherwise we want to bind symbols at libc link 589# time to eliminate startup relocations and PLT overhead. Use 590# --dynamic-list rather than -Bsymbolic-functions for greater 591# control over what symbols are left unbound. 592tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list" 593 594# Find compiler runtime library 595test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh 596test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt 597test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \ 598 && tryldflag LIBCC "$try_libcc" 599test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ 600 && tryldflag LIBCC "$try_libcc" 601printf "using compiler runtime libraries: %s\n" "$LIBCC" 602 603# Figure out arch variants for archs with variants 604SUBARCH= 605t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" 606 607if test "$ARCH" = "i386" ; then 608printf "checking whether compiler can use ebx in PIC asm constraints... " 609cat > "$tmpc" <<EOF 610int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; } 611EOF 612if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \ 613 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 614printf "yes\n" 615else 616printf "no\n" 617CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM" 618fi 619fi 620 621if test "$ARCH" = "x86_64" ; then 622trycppif __ILP32__ "$t" && ARCH=x32 623fi 624 625if test "$ARCH" = "arm" ; then 626if trycppif __thumb2__ "$t" ; then 627tryflag CFLAGS_AUTO -mimplicit-it=always 628tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always 629tryflag CFLAGS_AUTO -Wa,-mthumb 630fi 631trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb 632trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf 633# Versions of clang up until at least 3.8 have the wrong constraint codes 634# for floating point operands to inline asm. Detect this so the affected 635# source files can just disable the asm. 636if test "$cc_family" = clang ; then 637printf "checking whether clang's vfp asm constraints work... " 638echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc" 639if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 640printf "yes\n" 641else 642printf "no\n" 643CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM" 644CFLAGS_AUTO="${CFLAGS_AUTO# }" 645fi 646fi 647fi 648 649if test "$ARCH" = "aarch64" ; then 650trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be 651fi 652 653if test "$ARCH" = "m68k" ; then 654if trycppif "__HAVE_68881__" ; then : ; 655elif trycppif "__mcffpu__" ; then SUBARCH="-fp64" 656else SUBARCH="-sf" 657fi 658fi 659 660if test "$ARCH" = "mips" ; then 661trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 662trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el 663trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf 664fi 665 666if test "$ARCH" = "mips64" ; then 667trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32 668trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 669trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el 670trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf 671fi 672 673if test "$ARCH" = "powerpc" ; then 674trycppif "_SOFT_FLOAT || __NO_FPRS__" "$t" && SUBARCH=${SUBARCH}-sf 675printf "checking whether compiler can use 'd' constraint in asm... " 676echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc" 677if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 678printf "yes\n" 679else 680printf "no\n" 681CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM" 682CFLAGS_AUTO="${CFLAGS_AUTO# }" 683fi 684fi 685 686test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ 687&& SUBARCH=${SUBARCH}el 688 689if test "$ARCH" = "powerpc64" ; then 690trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI" 691trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le 692trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64" 693fi 694 695if test "$ARCH" = "riscv64" ; then 696trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf 697trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp 698fi 699 700if test "$ARCH" = "sh" ; then 701tryflag CFLAGS_AUTO -Wa,--isa=any 702trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb 703if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then 704# Some sh configurations are broken and replace double with float 705# rather than using softfloat when the fpu is present but only 706# supports single precision. Reject them. 707printf "checking whether compiler's double type is IEEE double... " 708echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" 709if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 710printf "yes\n" 711else 712printf "no\n" 713fail "$0: error: compiler's floating point configuration is unsupported" 714fi 715else 716SUBARCH=${SUBARCH}-nofpu 717fi 718if trycppif __SH_FDPIC__ "$t" ; then 719SUBARCH=${SUBARCH}-fdpic 720fi 721fi 722 723test "$SUBARCH" \ 724&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" 725 726case "$ARCH$SUBARCH" in 727arm) ASMSUBARCH=el ;; 728*) ASMSUBARCH=$SUBARCH ;; 729esac 730 731# 732# Some archs (powerpc) have different possible long double formats 733# that the compiler can be configured for. The logic for whether this 734# is supported is in bits/float.h; in general, it is not. We need to 735# check for mismatches here or code in printf, strotd, and scanf will 736# be dangerously incorrect because it depends on (1) the macros being 737# correct, and (2) IEEE semantics. 738# 739printf "checking whether compiler's long double definition matches float.h... " 740echo '#include <float.h>' > "$tmpc" 741echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc" 742echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc" 743if $CC $CFLAGS_C99FSE \ 744 -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \ 745 $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 746printf "yes\n" 747else 748printf "no\n" 749fail "$0: error: unsupported long double type" 750fi 751 752# 753# Some build systems globally pass in broken CFLAGS like -ffast-math 754# for all packages. On recent GCC we can detect this and error out 755# early rather than producing a seriously-broken math library. 756# 757if trycppif "__FAST_MATH__" \ 758 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then 759fail "$0: error: compiler has broken floating point; check CFLAGS" 760fi 761 762printf "creating config.mak... " 763 764cmdline=$(quote "$0") 765for i ; do cmdline="$cmdline $(quote "$i")" ; done 766 767exec 3>&1 1>config.mak 768 769 770cat << EOF 771# This version of config.mak was generated by: 772# $cmdline 773# Any changes made here will be lost if configure is re-run 774AR = ${AR:-\$(CROSS_COMPILE)ar} 775RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib} 776ARCH = $ARCH 777SUBARCH = $SUBARCH 778ASMSUBARCH = $ASMSUBARCH 779srcdir = $srcdir 780prefix = $prefix 781exec_prefix = $exec_prefix 782bindir = $bindir 783libdir = $libdir 784includedir = $includedir 785syslibdir = $syslibdir 786CC = $CC 787CFLAGS = $CFLAGS 788CFLAGS_AUTO = $CFLAGS_AUTO 789CFLAGS_C99FSE = $CFLAGS_C99FSE 790CFLAGS_MEMOPS = $CFLAGS_MEMOPS 791CFLAGS_NOSSP = $CFLAGS_NOSSP 792CPPFLAGS = $CPPFLAGS 793LDFLAGS = $LDFLAGS 794LDFLAGS_AUTO = $LDFLAGS_AUTO 795CROSS_COMPILE = $CROSS_COMPILE 796LIBCC = $LIBCC 797OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS 798ALL_TOOLS = $tools 799TOOL_LIBS = $tool_libs 800ADD_CFI = $ADD_CFI 801MALLOC_DIR = $malloc_dir 802EOF 803test "x$static" = xno && echo "STATIC_LIBS =" 804test "x$shared" = xno && echo "SHARED_LIBS =" 805test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)' 806test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)' 807test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)' 808exec 1>&3 3>&- 809 810test "$srcdir" = "." || ln -sf $srcdir/Makefile . 811 812printf "done\n" 813