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 --enable-warnings build with recommended warnings flags [disabled] 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 38Some influential environment variables: 39 CC C compiler command [detected] 40 CFLAGS C compiler flags [-Os -pipe ...] 41 CROSS_COMPILE prefix for cross compiler and tools [none] 42 LIBCC compiler runtime library [detected] 43 44Use these variables to override the choices made by configure. 45 46EOF 47exit 0 48} 49 50# Helper functions 51 52quote () { 53tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; } 54$1 55EOF 56printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" 57} 58echo () { printf "%s\n" "$*" ; } 59fail () { echo "$*" ; exit 1 ; } 60fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; } 61cmdexists () { type "$1" >/dev/null 2>&1 ; } 62trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; } 63 64stripdir () { 65while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done 66} 67 68trycppif () { 69printf "checking preprocessor condition %s... " "$1" 70echo "typedef int x;" > "$tmpc" 71echo "#if $1" >> "$tmpc" 72echo "#error yes" >> "$tmpc" 73echo "#endif" >> "$tmpc" 74if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 75printf "false\n" 76return 1 77else 78printf "true\n" 79return 0 80fi 81} 82 83tryflag () { 84printf "checking whether compiler accepts %s... " "$2" 85echo "typedef int x;" > "$tmpc" 86if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 87printf "yes\n" 88eval "$1=\"\${$1} \$2\"" 89eval "$1=\${$1# }" 90return 0 91else 92printf "no\n" 93return 1 94fi 95} 96 97tryldflag () { 98printf "checking whether linker accepts %s... " "$2" 99echo "typedef int x;" > "$tmpc" 100if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 101printf "yes\n" 102eval "$1=\"\${$1} \$2\"" 103eval "$1=\${$1# }" 104return 0 105else 106printf "no\n" 107return 1 108fi 109} 110 111 112 113# Beginning of actual script 114 115CFLAGS_C99FSE= 116CFLAGS_AUTO= 117CFLAGS_MEMOPS= 118CFLAGS_NOSSP= 119CFLAGS_TRY= 120LDFLAGS_AUTO= 121LDFLAGS_TRY= 122OPTIMIZE_GLOBS= 123srcdir= 124prefix=/usr/local/musl 125exec_prefix='$(prefix)' 126bindir='$(exec_prefix)/bin' 127libdir='$(prefix)/lib' 128includedir='$(prefix)/include' 129syslibdir='/lib' 130tools= 131tool_libs= 132build= 133target= 134optimize=auto 135debug=no 136warnings=no 137shared=auto 138static=yes 139wrapper=auto 140gcc_wrapper=no 141clang_wrapper=no 142 143for arg ; do 144case "$arg" in 145--help|-h) usage ;; 146--srcdir=*) srcdir=${arg#*=} ;; 147--prefix=*) prefix=${arg#*=} ;; 148--exec-prefix=*) exec_prefix=${arg#*=} ;; 149--bindir=*) bindir=${arg#*=} ;; 150--libdir=*) libdir=${arg#*=} ;; 151--includedir=*) includedir=${arg#*=} ;; 152--syslibdir=*) syslibdir=${arg#*=} ;; 153--enable-shared|--enable-shared=yes) shared=yes ;; 154--disable-shared|--enable-shared=no) shared=no ;; 155--enable-static|--enable-static=yes) static=yes ;; 156--disable-static|--enable-static=no) static=no ;; 157--enable-optimize) optimize=yes ;; 158--enable-optimize=*) optimize=${arg#*=} ;; 159--disable-optimize) optimize=no ;; 160--enable-debug|--enable-debug=yes) debug=yes ;; 161--disable-debug|--enable-debug=no) debug=no ;; 162--enable-warnings|--enable-warnings=yes) warnings=yes ;; 163--disable-warnings|--enable-warnings=no) warnings=no ;; 164--enable-wrapper|--enable-wrapper=yes) wrapper=detect ;; 165--enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;; 166--enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;; 167--enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;; 168--disable-wrapper|--enable-wrapper=no) wrapper=no ;; 169--enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;; 170--disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;; 171--enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;; 172--host=*|--target=*) target=${arg#*=} ;; 173--build=*) build=${arg#*=} ;; 174-* ) echo "$0: unknown option $arg" ;; 175AR=*) AR=${arg#*=} ;; 176RANLIB=*) RANLIB=${arg#*=} ;; 177CC=*) CC=${arg#*=} ;; 178CFLAGS=*) CFLAGS=${arg#*=} ;; 179CPPFLAGS=*) CPPFLAGS=${arg#*=} ;; 180LDFLAGS=*) LDFLAGS=${arg#*=} ;; 181CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;; 182LIBCC=*) LIBCC=${arg#*=} ;; 183*=*) ;; 184*) build=$arg ; target=$arg ;; 185esac 186done 187 188for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do 189stripdir $i 190done 191 192# 193# Get the source dir for out-of-tree builds 194# 195if test -z "$srcdir" ; then 196srcdir="${0%/configure}" 197stripdir srcdir 198fi 199abs_builddir="$(pwd)" || fail "$0: cannot determine working directory" 200abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir" 201test "$abs_srcdir" = "$abs_builddir" && srcdir=. 202test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory" 203 204# 205# Get a temp filename we can use 206# 207i=0 208set -C 209while : ; do i=$(($i+1)) 210tmpc="./conf$$-$PPID-$i.c" 2112>|/dev/null > "$tmpc" && break 212test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc" 213done 214set +C 215trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP 216 217# 218# Check whether we are cross-compiling, and set a default 219# CROSS_COMPILE prefix if none was provided. 220# 221test "$target" && \ 222test "$target" != "$build" && \ 223test -z "$CROSS_COMPILE" && \ 224CROSS_COMPILE="$target-" 225 226# 227# Find a C compiler to use 228# 229printf "checking for C compiler... " 230trycc ${CROSS_COMPILE}gcc 231trycc ${CROSS_COMPILE}c99 232trycc ${CROSS_COMPILE}cc 233printf "%s\n" "$CC" 234test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; } 235 236printf "checking whether C compiler works... " 237echo "typedef int x;" > "$tmpc" 238if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then 239printf "yes\n" 240else 241printf "no; compiler output follows:\n%s\n" "$output" 242exit 1 243fi 244 245# 246# Figure out options to force errors on unknown flags. 247# 248tryflag CFLAGS_TRY -Werror=unknown-warning-option 249tryflag CFLAGS_TRY -Werror=unused-command-line-argument 250tryflag CFLAGS_TRY -Werror=ignored-optimization-argument 251tryldflag LDFLAGS_TRY -Werror=unknown-warning-option 252tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument 253 254# 255# Need to know if the compiler is gcc or clang to decide which toolchain 256# wrappers to build. 257# 258printf "checking for C compiler family... " 259cc_ver="$(LC_ALL=C $CC -v 2>&1)" 260cc_family=unknown 261if fnmatch '*gcc\ version*' "$cc_ver" ; then 262cc_family=gcc 263elif fnmatch '*clang\ version*' "$cc_ver" ; then 264cc_family=clang 265fi 266echo "$cc_family" 267 268# 269# Figure out toolchain wrapper to build 270# 271if test "$wrapper" = auto -o "$wrapper" = detect ; then 272echo "#include <stdlib.h>" > "$tmpc" 273echo "#if ! __GLIBC__" >> "$tmpc" 274echo "#error no" >> "$tmpc" 275echo "#endif" >> "$tmpc" 276printf "checking for toolchain wrapper to build... " 277if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 278echo "none" 279elif test "$cc_family" = gcc ; then 280gcc_wrapper=yes 281echo "gcc" 282elif test "$cc_family" = clang ; then 283clang_wrapper=yes 284echo "clang" 285else 286echo "none" 287if test "$wrapper" = detect ; then 288fail "$0: could not find an appropriate toolchain wrapper" 289fi 290fi 291fi 292 293if test "$gcc_wrapper" = yes ; then 294tools="$tools obj/musl-gcc" 295tool_libs="$tool_libs lib/musl-gcc.specs" 296fi 297if test "$clang_wrapper" = yes ; then 298tools="$tools obj/musl-clang obj/ld.musl-clang" 299fi 300 301# 302# Find the target architecture 303# 304printf "checking target system type... " 305test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown 306printf "%s\n" "$target" 307 308# 309# Convert to just ARCH 310# 311case "$target" in 312# Catch these early to simplify matching for 32-bit archs 313arm*) ARCH=arm ;; 314aarch64*) ARCH=aarch64 ;; 315i?86-nt32*) ARCH=nt32 ;; 316i?86*) ARCH=i386 ;; 317x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;; 318x86_64-nt64*) ARCH=nt64 ;; 319x86_64*) ARCH=x86_64 ;; 320m68k*) ARCH=m68k ;; 321mips64*|mipsisa64*) ARCH=mips64 ;; 322mips*) ARCH=mips ;; 323microblaze*) ARCH=microblaze ;; 324or1k*) ARCH=or1k ;; 325powerpc64*|ppc64*) ARCH=powerpc64 ;; 326powerpc*|ppc*) ARCH=powerpc ;; 327riscv64*) ARCH=riscv64 ;; 328sh[1-9bel-]*|sh|superh*) ARCH=sh ;; 329s390x*) ARCH=s390x ;; 330unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; 331*) fail "$0: unknown or unsupported target \"$target\"" ;; 332esac 333 334# 335# Try to get a conforming C99 freestanding environment 336# 337tryflag CFLAGS_C99FSE -std=c99 338tryflag CFLAGS_C99FSE -nostdinc 339tryflag CFLAGS_C99FSE -ffreestanding \ 340|| tryflag CFLAGS_C99FSE -fno-builtin 341tryflag CFLAGS_C99FSE -fexcess-precision=standard \ 342|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } 343tryflag CFLAGS_C99FSE -frounding-math 344 345# 346# We may use the may_alias attribute if __GNUC__ is defined, so 347# if the compiler defines __GNUC__ but does not provide it, 348# it must be defined away as part of the CFLAGS. 349# 350printf "checking whether compiler needs attribute((may_alias)) suppression... " 351cat > "$tmpc" <<EOF 352typedef int 353#ifdef __GNUC__ 354__attribute__((__may_alias__)) 355#endif 356x; 357EOF 358if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ 359 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 360printf "no\n" 361else 362printf "yes\n" 363CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" 364fi 365 366# 367# The GNU toolchain defaults to assuming unmarked files need an 368# executable stack, potentially exposing vulnerabilities in programs 369# linked with such object files. Fix this. 370# 371tryflag CFLAGS_C99FSE -Wa,--noexecstack 372 373# 374# Check for options to disable stack protector, which needs to be 375# disabled for a few early-bootstrap translation units. If not found, 376# this is not an error; we assume the toolchain does not do ssp. 377# 378tryflag CFLAGS_NOSSP -fno-stack-protector 379 380# 381# Check for options that may be needed to prevent the compiler from 382# generating self-referential versions of memcpy,, memmove, memcmp, 383# and memset. Really, we should add a check to determine if this 384# option is sufficient, and if not, add a macro to cripple these 385# functions with volatile... 386# 387tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns 388 389# 390# Enable debugging if requessted. 391# 392test "$debug" = yes && CFLAGS_AUTO=-g 393 394# 395# Preprocess asm files to add extra debugging information if debug is 396# enabled, our assembler supports the needed directives, and the 397# preprocessing script has been written for our architecture. 398# 399printf "checking whether we should preprocess assembly to add debugging information... " 400if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" && 401 test -f "tools/add-cfi.$ARCH.awk" && 402 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null - 403then 404 ADD_CFI=yes 405else 406 ADD_CFI=no 407fi 408printf "%s\n" "$ADD_CFI" 409 410# 411# Possibly add a -O option to CFLAGS and select modules to optimize with 412# -O3 based on the status of --enable-optimize and provided CFLAGS. 413# 414printf "checking for optimization settings... " 415case "x$optimize" in 416xauto) 417if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then 418printf "using provided CFLAGS\n" ;optimize=no 419else 420printf "using defaults\n" ; optimize=yes 421fi 422;; 423xsize|xnone) printf "minimize size\n" ; optimize=size ;; 424xno|x) printf "disabled\n" ; optimize=no ;; 425*) printf "custom\n" ;; 426esac 427 428test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2 429test "$optimize" = yes && optimize="internal,malloc,string" 430 431if fnmatch 'no|size' "$optimize" ; then : 432else 433printf "components to be optimized for speed:" 434while test "$optimize" ; do 435case "$optimize" in 436*,*) this=${optimize%%,*} optimize=${optimize#*,} ;; 437*) this=$optimize optimize= 438esac 439printf " $this" 440case "$this" in 441*/*.c) ;; 442*/*) this=$this*.c ;; 443*) this=$this/*.c ;; 444esac 445OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" 446done 447OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } 448printf "\n" 449fi 450 451# Always try -pipe 452tryflag CFLAGS_AUTO -pipe 453 454# 455# If debugging is disabled, omit frame pointer. Modern GCC does this 456# anyway on most archs even when debugging is enabled since the frame 457# pointer is no longer needed for debugging. 458# 459if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : 460else 461tryflag CFLAGS_AUTO -fomit-frame-pointer 462fi 463 464# 465# Modern GCC wants to put DWARF tables (used for debugging and 466# unwinding) in the loaded part of the program where they are 467# unstrippable. These options force them back to debug sections (and 468# cause them not to get generated at all if debugging is off). 469# 470tryflag CFLAGS_AUTO -fno-unwind-tables 471tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables 472 473# 474# Attempt to put each function and each data object in its own 475# section. This both allows additional size optimizations at link 476# time and works around a dangerous class of compiler/assembler bugs 477# whereby relative address expressions are constant-folded by the 478# assembler even when one or more of the symbols involved is 479# replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc. 480# 481tryflag CFLAGS_AUTO -ffunction-sections 482tryflag CFLAGS_AUTO -fdata-sections 483 484# 485# On x86, make sure we don't have incompatible instruction set 486# extensions enabled by default. This is bad for making static binaries. 487# We cheat and use i486 rather than i386 because i386 really does not 488# work anyway (issues with atomic ops). 489# Some build environments pass -march and -mtune options via CC, so 490# check both CC and CFLAGS. 491# 492if test "$ARCH" = "i386" ; then 493fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 494fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic 495fi 496 497# 498# Even with -std=c99, gcc accepts some constructs which are constraint 499# violations. We want to treat these as errors regardless of whether 500# other purely stylistic warnings are enabled -- especially implicit 501# function declarations, which are a dangerous programming error. 502# 503tryflag CFLAGS_AUTO -Werror=implicit-function-declaration 504tryflag CFLAGS_AUTO -Werror=implicit-int 505tryflag CFLAGS_AUTO -Werror=pointer-sign 506tryflag CFLAGS_AUTO -Werror=pointer-arith 507 508# 509# GCC ignores unused arguements by default, but Clang needs this extra 510# parameter to stop printing warnings about LDFLAGS passed during 511# compiling stage and CFLAGS passed during linking stage. 512# 513test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments 514 515if test "x$warnings" = xyes ; then 516tryflag CFLAGS_AUTO -Wall 517tryflag CFLAGS_AUTO -Wno-parentheses 518tryflag CFLAGS_AUTO -Wno-uninitialized 519tryflag CFLAGS_AUTO -Wno-missing-braces 520tryflag CFLAGS_AUTO -Wno-unused-value 521tryflag CFLAGS_AUTO -Wno-unused-but-set-variable 522tryflag CFLAGS_AUTO -Wno-unknown-pragmas 523tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast 524fi 525 526# Determine if the compiler produces position-independent code (PIC) 527# by default. If so, we don't need to compile separate object files 528# for libc.a and libc.so. 529if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then 530pic_default=yes 531else 532pic_default=no 533fi 534 535# Reduce space lost to padding for alignment purposes by sorting data 536# objects according to their alignment reqirements. This approximates 537# optimal packing. 538tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment 539tryldflag LDFLAGS_AUTO -Wl,--sort-common 540 541# When linking shared library, drop dummy weak definitions that were 542# replaced by strong definitions from other translation units. 543tryldflag LDFLAGS_AUTO -Wl,--gc-sections 544 545# Some patched GCC builds have these defaults messed up... 546tryldflag LDFLAGS_AUTO -Wl,--hash-style=both 547 548# Prevent linking if there are undefined symbols; if any exist, 549# libc.so will crash at runtime during relocation processing. 550# The common way this can happen is failure to link the compiler 551# runtime library; implementation error is also a possibility. 552tryldflag LDFLAGS_AUTO -Wl,--no-undefined 553 554# Avoid exporting symbols from compiler runtime libraries. They 555# should be hidden anyway, but some toolchains including old gcc 556# versions built without shared library support and pcc are broken. 557tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL 558 559# Public data symbols must be interposable to allow for copy 560# relocations, but otherwise we want to bind symbols at libc link 561# time to eliminate startup relocations and PLT overhead. Use 562# --dynamic-list rather than -Bsymbolic-functions for greater 563# control over what symbols are left unbound. 564tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list" 565 566# Find compiler runtime library 567test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh 568test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt 569test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \ 570 && tryldflag LIBCC "$try_libcc" 571test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ 572 && tryldflag LIBCC "$try_libcc" 573printf "using compiler runtime libraries: %s\n" "$LIBCC" 574 575# Figure out arch variants for archs with variants 576SUBARCH= 577t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" 578 579if test "$ARCH" = "i386" ; then 580printf "checking whether compiler can use ebx in PIC asm constraints... " 581cat > "$tmpc" <<EOF 582int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; } 583EOF 584if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \ 585 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 586printf "yes\n" 587else 588printf "no\n" 589CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM" 590fi 591fi 592 593if test "$ARCH" = "x86_64" ; then 594trycppif __ILP32__ "$t" && ARCH=x32 595fi 596 597if test "$ARCH" = "arm" ; then 598if trycppif __thumb2__ "$t" ; then 599tryflag CFLAGS_AUTO -mimplicit-it=always 600tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always 601tryflag CFLAGS_AUTO -Wa,-mthumb 602fi 603trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb 604trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf 605# Versions of clang up until at least 3.8 have the wrong constraint codes 606# for floating point operands to inline asm. Detect this so the affected 607# source files can just disable the asm. 608if test "$cc_family" = clang ; then 609printf "checking whether clang's vfp asm constraints work... " 610echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc" 611if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 612printf "yes\n" 613else 614printf "no\n" 615CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM" 616CFLAGS_AUTO="${CFLAGS_AUTO# }" 617fi 618fi 619fi 620 621if test "$ARCH" = "aarch64" ; then 622trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be 623fi 624 625if test "$ARCH" = "m68k" ; then 626if trycppif "__HAVE_68881__" ; then : ; 627elif trycppif "__mcffpu__" ; then SUBARCH="-fp64" 628else SUBARCH="-sf" 629fi 630fi 631 632if test "$ARCH" = "mips" ; then 633trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 634trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el 635trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf 636fi 637 638if test "$ARCH" = "mips64" ; then 639trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32 640trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 641trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el 642trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf 643fi 644 645if test "$ARCH" = "powerpc" ; then 646trycppif "__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \ 647 "$0: error: compiler's floating point configuration is unsupported" 648trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf 649printf "checking whether compiler can use 'd' constraint in asm... " 650echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc" 651if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 652printf "yes\n" 653else 654printf "no\n" 655CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM" 656CFLAGS_AUTO="${CFLAGS_AUTO# }" 657fi 658fi 659 660test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ 661&& SUBARCH=${SUBARCH}el 662 663if test "$ARCH" = "powerpc64" ; then 664trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI" 665trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le 666trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64" 667fi 668 669if test "$ARCH" = "riscv64" ; then 670trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf 671trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp 672fi 673 674if test "$ARCH" = "sh" ; then 675tryflag CFLAGS_AUTO -Wa,--isa=any 676trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb 677if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then 678# Some sh configurations are broken and replace double with float 679# rather than using softfloat when the fpu is present but only 680# supports single precision. Reject them. 681printf "checking whether compiler's double type is IEEE double... " 682echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" 683if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 684printf "yes\n" 685else 686printf "no\n" 687fail "$0: error: compiler's floating point configuration is unsupported" 688fi 689else 690SUBARCH=${SUBARCH}-nofpu 691fi 692if trycppif __SH_FDPIC__ "$t" ; then 693SUBARCH=${SUBARCH}-fdpic 694fi 695fi 696 697test "$SUBARCH" \ 698&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" 699 700case "$ARCH$SUBARCH" in 701arm) ASMSUBARCH=el ;; 702*) ASMSUBARCH=$SUBARCH ;; 703esac 704 705# 706# Some archs (powerpc) have different possible long double formats 707# that the compiler can be configured for. The logic for whether this 708# is supported is in bits/float.h; in general, it is not. We need to 709# check for mismatches here or code in printf, strotd, and scanf will 710# be dangerously incorrect because it depends on (1) the macros being 711# correct, and (2) IEEE semantics. 712# 713printf "checking whether compiler's long double definition matches float.h... " 714echo '#include <float.h>' > "$tmpc" 715echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc" 716echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc" 717if $CC $CFLAGS_C99FSE \ 718 -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \ 719 $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 720printf "yes\n" 721else 722printf "no\n" 723fail "$0: error: unsupported long double type" 724fi 725 726# 727# Some build systems globally pass in broken CFLAGS like -ffast-math 728# for all packages. On recent GCC we can detect this and error out 729# early rather than producing a seriously-broken math library. 730# 731if trycppif "__FAST_MATH__" \ 732 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then 733fail "$0: error: compiler has broken floating point; check CFLAGS" 734fi 735 736printf "creating config.mak... " 737 738cmdline=$(quote "$0") 739for i ; do cmdline="$cmdline $(quote "$i")" ; done 740 741exec 3>&1 1>config.mak 742 743 744cat << EOF 745# This version of config.mak was generated by: 746# $cmdline 747# Any changes made here will be lost if configure is re-run 748AR = ${AR:-\$(CROSS_COMPILE)ar} 749RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib} 750ARCH = $ARCH 751SUBARCH = $SUBARCH 752ASMSUBARCH = $ASMSUBARCH 753srcdir = $srcdir 754prefix = $prefix 755exec_prefix = $exec_prefix 756bindir = $bindir 757libdir = $libdir 758includedir = $includedir 759syslibdir = $syslibdir 760CC = $CC 761CFLAGS = $CFLAGS 762CFLAGS_AUTO = $CFLAGS_AUTO 763CFLAGS_C99FSE = $CFLAGS_C99FSE 764CFLAGS_MEMOPS = $CFLAGS_MEMOPS 765CFLAGS_NOSSP = $CFLAGS_NOSSP 766CPPFLAGS = $CPPFLAGS 767LDFLAGS = $LDFLAGS 768LDFLAGS_AUTO = $LDFLAGS_AUTO 769CROSS_COMPILE = $CROSS_COMPILE 770LIBCC = $LIBCC 771OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS 772ALL_TOOLS = $tools 773TOOL_LIBS = $tool_libs 774ADD_CFI = $ADD_CFI 775EOF 776test "x$static" = xno && echo "STATIC_LIBS =" 777test "x$shared" = xno && echo "SHARED_LIBS =" 778test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)' 779test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)' 780test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)' 781exec 1>&3 3>&- 782 783test "$srcdir" = "." || ln -sf $srcdir/Makefile . 784 785printf "done\n" 786