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 ;; 331loongarch64*) ARCH=loongarch64 ;; 332m68k*) ARCH=m68k ;; 333mips64*|mipsisa64*) ARCH=mips64 ;; 334mips*) ARCH=mips ;; 335microblaze*) ARCH=microblaze ;; 336or1k*) ARCH=or1k ;; 337powerpc64*|ppc64*) ARCH=powerpc64 ;; 338powerpc*|ppc*) ARCH=powerpc ;; 339riscv64*) ARCH=riscv64 ;; 340riscv32*) ARCH=riscv32 ;; 341sh[1-9bel-]*|sh|superh*) ARCH=sh ;; 342s390x*) ARCH=s390x ;; 343unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; 344*) fail "$0: unknown or unsupported target \"$target\"" ;; 345esac 346 347# 348# Try to get a conforming C99 freestanding environment 349# 350tryflag CFLAGS_C99FSE -std=c99 351tryflag CFLAGS_C99FSE -nostdinc 352tryflag CFLAGS_C99FSE -ffreestanding \ 353|| tryflag CFLAGS_C99FSE -fno-builtin 354tryflag CFLAGS_C99FSE -fexcess-precision=standard \ 355|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } 356tryflag CFLAGS_C99FSE -frounding-math 357 358# 359# Semantically we want to insist that our sources follow the 360# C rules for type-based aliasing, but most if not all real-world 361# compilers are known or suspected to have critical bugs in their 362# type-based aliasing analysis. See for example GCC bug 107107. 363# 364tryflag CFLAGS_C99FSE -fno-strict-aliasing 365 366# 367# We may use the may_alias attribute if __GNUC__ is defined, so 368# if the compiler defines __GNUC__ but does not provide it, 369# it must be defined away as part of the CFLAGS. 370# 371printf "checking whether compiler needs attribute((may_alias)) suppression... " 372cat > "$tmpc" <<EOF 373typedef int 374#ifdef __GNUC__ 375__attribute__((__may_alias__)) 376#endif 377x; 378EOF 379if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ 380 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 381printf "no\n" 382else 383printf "yes\n" 384CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" 385fi 386 387# 388# The GNU toolchain defaults to assuming unmarked files need an 389# executable stack, potentially exposing vulnerabilities in programs 390# linked with such object files. Fix this. 391# 392tryflag CFLAGS_C99FSE -Wa,--noexecstack 393 394# 395# Check for options to disable stack protector, which needs to be 396# disabled for a few early-bootstrap translation units. If not found, 397# this is not an error; we assume the toolchain does not do ssp. 398# 399tryflag CFLAGS_NOSSP -fno-stack-protector 400 401# 402# Check for options that may be needed to prevent the compiler from 403# generating self-referential versions of memcpy,, memmove, memcmp, 404# and memset. Really, we should add a check to determine if this 405# option is sufficient, and if not, add a macro to cripple these 406# functions with volatile... 407# 408tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns 409 410# 411# Enable debugging if requessted. 412# 413test "$debug" = yes && CFLAGS_AUTO=-g 414 415# 416# Preprocess asm files to add extra debugging information if debug is 417# enabled, our assembler supports the needed directives, and the 418# preprocessing script has been written for our architecture. 419# 420printf "checking whether we should preprocess assembly to add debugging information... " 421if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" && 422 test -f "$srcdir/tools/add-cfi.$ARCH.awk" && 423 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null - 424then 425 ADD_CFI=yes 426else 427 ADD_CFI=no 428fi 429printf "%s\n" "$ADD_CFI" 430 431# 432# Possibly add a -O option to CFLAGS and select modules to optimize with 433# -O3 based on the status of --enable-optimize and provided CFLAGS. 434# 435printf "checking for optimization settings... " 436case "x$optimize" in 437xauto) 438if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then 439printf "using provided CFLAGS\n" ;optimize=no 440else 441printf "using defaults\n" ; optimize=yes 442fi 443;; 444xsize|xnone) printf "minimize size\n" ; optimize=size ;; 445xno|x) printf "disabled\n" ; optimize=no ;; 446*) printf "custom\n" ;; 447esac 448 449if test "$optimize" = no ; then : 450else 451tryflag CFLAGS_AUTO -O2 452tryflag CFLAGS_AUTO -fno-align-jumps 453tryflag CFLAGS_AUTO -fno-align-functions 454tryflag CFLAGS_AUTO -fno-align-loops 455tryflag CFLAGS_AUTO -fno-align-labels 456tryflag CFLAGS_AUTO -fira-region=one 457tryflag CFLAGS_AUTO -fira-hoist-pressure 458tryflag CFLAGS_AUTO -freorder-blocks-algorithm=simple \ 459|| tryflag CFLAGS_AUTO -fno-reorder-blocks 460tryflag CFLAGS_AUTO -fno-prefetch-loop-arrays 461tryflag CFLAGS_AUTO -fno-tree-ch 462fi 463test "$optimize" = yes && optimize="internal,malloc,string" 464 465if fnmatch 'no|size' "$optimize" ; then : 466else 467printf "components to be optimized for speed:" 468while test "$optimize" ; do 469case "$optimize" in 470*,*) this=${optimize%%,*} optimize=${optimize#*,} ;; 471*) this=$optimize optimize= 472esac 473printf " $this" 474case "$this" in 475*/*.c) ;; 476*/*) this=$this*.c ;; 477*) this=$this/*.c ;; 478esac 479OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" 480done 481OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } 482printf "\n" 483fi 484 485# Always try -pipe 486tryflag CFLAGS_AUTO -pipe 487 488# 489# If debugging is disabled, omit frame pointer. Modern GCC does this 490# anyway on most archs even when debugging is enabled since the frame 491# pointer is no longer needed for debugging. 492# 493if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : 494else 495tryflag CFLAGS_AUTO -fomit-frame-pointer 496fi 497 498# 499# Modern GCC wants to put DWARF tables (used for debugging and 500# unwinding) in the loaded part of the program where they are 501# unstrippable. These options force them back to debug sections (and 502# cause them not to get generated at all if debugging is off). 503# 504tryflag CFLAGS_AUTO -fno-unwind-tables 505tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables 506 507# 508# Attempt to put each function and each data object in its own 509# section. This both allows additional size optimizations at link 510# time and works around a dangerous class of compiler/assembler bugs 511# whereby relative address expressions are constant-folded by the 512# assembler even when one or more of the symbols involved is 513# replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc. 514# 515tryflag CFLAGS_AUTO -ffunction-sections 516tryflag CFLAGS_AUTO -fdata-sections 517 518# 519# On x86, make sure we don't have incompatible instruction set 520# extensions enabled by default. This is bad for making static binaries. 521# We cheat and use i486 rather than i386 because i386 really does not 522# work anyway (issues with atomic ops). 523# Some build environments pass -march and -mtune options via CC, so 524# check both CC and CFLAGS. 525# 526if test "$ARCH" = "i386" ; then 527fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 528fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic 529fi 530 531# 532# GCC defines -w as overriding any -W options, regardless of order, but 533# clang has a bunch of annoying warnings enabled by default and needs -w 534# to start from a clean slate. So use -w if building with clang. Also 535# turn off a common on-by-default cast warning regardless of compiler. 536# 537test "$cc_family" = clang && tryflag CFLAGS_AUTO -w 538 539tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast 540 541# 542# Even with -std=c99, gcc accepts some constructs which are constraint 543# violations. We want to treat these as errors regardless of whether 544# other purely stylistic warnings are enabled -- especially implicit 545# function declarations, which are a dangerous programming error. 546# 547tryflag CFLAGS_AUTO -Werror=implicit-function-declaration 548tryflag CFLAGS_AUTO -Werror=implicit-int 549tryflag CFLAGS_AUTO -Werror=pointer-sign 550tryflag CFLAGS_AUTO -Werror=pointer-arith 551tryflag CFLAGS_AUTO -Werror=int-conversion 552tryflag CFLAGS_AUTO -Werror=incompatible-pointer-types 553tryflag CFLAGS_AUTO -Werror=discarded-qualifiers 554tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers 555 556# 557# GCC ignores unused arguements by default, but Clang needs this extra 558# parameter to stop printing warnings about LDFLAGS passed during 559# compiling stage and CFLAGS passed during linking stage. 560# 561test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments 562 563if test "x$warnings" = xyes ; then 564tryflag CFLAGS_AUTO -Waddress 565tryflag CFLAGS_AUTO -Warray-bounds 566tryflag CFLAGS_AUTO -Wchar-subscripts 567tryflag CFLAGS_AUTO -Wduplicate-decl-specifier 568tryflag CFLAGS_AUTO -Winit-self 569tryflag CFLAGS_AUTO -Wreturn-type 570tryflag CFLAGS_AUTO -Wsequence-point 571tryflag CFLAGS_AUTO -Wstrict-aliasing 572tryflag CFLAGS_AUTO -Wunused-function 573tryflag CFLAGS_AUTO -Wunused-label 574tryflag CFLAGS_AUTO -Wunused-variable 575fi 576 577# Determine if the compiler produces position-independent code (PIC) 578# by default. If so, we don't need to compile separate object files 579# for libc.a and libc.so. 580if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then 581pic_default=yes 582else 583pic_default=no 584fi 585 586# Reduce space lost to padding for alignment purposes by sorting data 587# objects according to their alignment reqirements. This approximates 588# optimal packing. 589tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment 590tryldflag LDFLAGS_AUTO -Wl,--sort-common 591 592# When linking shared library, drop dummy weak definitions that were 593# replaced by strong definitions from other translation units. 594tryldflag LDFLAGS_AUTO -Wl,--gc-sections 595 596# Some patched GCC builds have these defaults messed up... 597tryldflag LDFLAGS_AUTO -Wl,--hash-style=both 598 599# Prevent linking if there are undefined symbols; if any exist, 600# libc.so will crash at runtime during relocation processing. 601# The common way this can happen is failure to link the compiler 602# runtime library; implementation error is also a possibility. 603tryldflag LDFLAGS_AUTO -Wl,--no-undefined 604 605# Avoid exporting symbols from compiler runtime libraries. They 606# should be hidden anyway, but some toolchains including old gcc 607# versions built without shared library support and pcc are broken. 608tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL 609 610# Public data symbols must be interposable to allow for copy 611# relocations, but otherwise we want to bind symbols at libc link 612# time to eliminate startup relocations and PLT overhead. Use 613# --dynamic-list rather than -Bsymbolic-functions for greater 614# control over what symbols are left unbound. 615tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list" 616 617# Find compiler runtime library 618test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh 619test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt 620test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \ 621 && tryldflag LIBCC "$try_libcc" 622test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ 623 && tryldflag LIBCC "$try_libcc" 624printf "using compiler runtime libraries: %s\n" "$LIBCC" 625 626# Figure out arch variants for archs with variants 627SUBARCH= 628t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" 629 630if test "$ARCH" = "i386" ; then 631printf "checking whether compiler can use ebx in PIC asm constraints... " 632cat > "$tmpc" <<EOF 633int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; } 634EOF 635if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \ 636 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 637printf "yes\n" 638else 639printf "no\n" 640CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM" 641fi 642fi 643 644if test "$ARCH" = "x86_64" ; then 645trycppif __ILP32__ "$t" && ARCH=x32 646fi 647 648if test "$ARCH" = "arm" ; then 649if trycppif __thumb2__ "$t" ; then 650tryflag CFLAGS_AUTO -mimplicit-it=always 651tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always 652tryflag CFLAGS_AUTO -Wa,-mthumb 653fi 654trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb 655trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf 656# Versions of clang up until at least 3.8 have the wrong constraint codes 657# for floating point operands to inline asm. Detect this so the affected 658# source files can just disable the asm. 659if test "$cc_family" = clang ; then 660printf "checking whether clang's vfp asm constraints work... " 661echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc" 662if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 663printf "yes\n" 664else 665printf "no\n" 666CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM" 667CFLAGS_AUTO="${CFLAGS_AUTO# }" 668fi 669fi 670fi 671 672if test "$ARCH" = "aarch64" ; then 673trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be 674fi 675 676if test "$ARCH" = "loongarch64" ; then 677trycppif __loongarch_soft_float "$t" && SUBARCH=${SUBARCH}-sf 678trycppif __loongarch_single_float "$t" && SUBARCH=${SUBARCH}-sp 679printf "checking whether assembler support FCSRs... " 680echo "__asm__(\"movfcsr2gr \$t0,\$fcsr0\");" > "$tmpc" 681if $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 682printf "yes\n" 683else 684printf "no\n" 685CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_LOONGARCH_FCSR_ASM" 686fi 687fi 688 689if test "$ARCH" = "m68k" ; then 690if trycppif "__HAVE_68881__" ; then : ; 691elif trycppif "__mcffpu__" ; then SUBARCH="-fp64" 692else SUBARCH="-sf" 693fi 694fi 695 696if test "$ARCH" = "mips" ; then 697trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 698trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el 699trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf 700fi 701 702if test "$ARCH" = "mips64" ; then 703trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32 704trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 705trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el 706trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf 707fi 708 709if test "$ARCH" = "powerpc" ; then 710trycppif "_SOFT_FLOAT || __NO_FPRS__" "$t" && SUBARCH=${SUBARCH}-sf 711printf "checking whether compiler can use 'd' constraint in asm... " 712echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc" 713if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 714printf "yes\n" 715else 716printf "no\n" 717CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM" 718CFLAGS_AUTO="${CFLAGS_AUTO# }" 719fi 720fi 721 722test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ 723&& SUBARCH=${SUBARCH}el 724 725if test "$ARCH" = "powerpc64" ; then 726trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI" 727trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le 728trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64" 729fi 730 731if test "$ARCH" = "riscv64" -o "$ARCH" = "riscv32" ; then 732trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf 733trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp 734fi 735 736if test "$ARCH" = "sh" ; then 737tryflag CFLAGS_AUTO -Wa,--isa=any 738trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb 739if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then 740# Some sh configurations are broken and replace double with float 741# rather than using softfloat when the fpu is present but only 742# supports single precision. Reject them. 743printf "checking whether compiler's double type is IEEE double... " 744echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" 745if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 746printf "yes\n" 747else 748printf "no\n" 749fail "$0: error: compiler's floating point configuration is unsupported" 750fi 751else 752SUBARCH=${SUBARCH}-nofpu 753fi 754if trycppif __SH_FDPIC__ "$t" ; then 755SUBARCH=${SUBARCH}-fdpic 756fi 757fi 758 759test "$SUBARCH" \ 760&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" 761 762# 763# Some archs (powerpc) have different possible long double formats 764# that the compiler can be configured for. The logic for whether this 765# is supported is in bits/float.h; in general, it is not. We need to 766# check for mismatches here or code in printf, strotd, and scanf will 767# be dangerously incorrect because it depends on (1) the macros being 768# correct, and (2) IEEE semantics. 769# 770printf "checking whether compiler's long double definition matches float.h... " 771echo '#include <float.h>' > "$tmpc" 772echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc" 773echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc" 774if $CC $CFLAGS_C99FSE \ 775 -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \ 776 $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then 777printf "yes\n" 778else 779printf "no\n" 780fail "$0: error: unsupported long double type" 781fi 782 783# 784# Some build systems globally pass in broken CFLAGS like -ffast-math 785# for all packages. On recent GCC we can detect this and error out 786# early rather than producing a seriously-broken math library. 787# 788if trycppif "__FAST_MATH__" \ 789 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then 790fail "$0: error: compiler has broken floating point; check CFLAGS" 791fi 792 793printf "creating config.mak... " 794 795cmdline=$(quote "$0") 796for i ; do cmdline="$cmdline $(quote "$i")" ; done 797 798exec 3>&1 1>config.mak 799 800 801cat << EOF 802# This version of config.mak was generated by: 803# $cmdline 804# Any changes made here will be lost if configure is re-run 805AR = ${AR:-\$(CROSS_COMPILE)ar} 806RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib} 807ARCH = $ARCH 808SUBARCH = $SUBARCH 809ASMSUBARCH = $ASMSUBARCH 810srcdir = $srcdir 811prefix = $prefix 812exec_prefix = $exec_prefix 813bindir = $bindir 814libdir = $libdir 815includedir = $includedir 816syslibdir = $syslibdir 817CC = $CC 818CFLAGS = $CFLAGS 819CFLAGS_AUTO = $CFLAGS_AUTO 820CFLAGS_C99FSE = $CFLAGS_C99FSE 821CFLAGS_MEMOPS = $CFLAGS_MEMOPS 822CFLAGS_NOSSP = $CFLAGS_NOSSP 823CPPFLAGS = $CPPFLAGS 824LDFLAGS = $LDFLAGS 825LDFLAGS_AUTO = $LDFLAGS_AUTO 826CROSS_COMPILE = $CROSS_COMPILE 827LIBCC = $LIBCC 828OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS 829ALL_TOOLS = $tools 830TOOL_LIBS = $tool_libs 831ADD_CFI = $ADD_CFI 832MALLOC_DIR = $malloc_dir 833EOF 834test "x$static" = xno && echo "STATIC_LIBS =" 835test "x$shared" = xno && echo "SHARED_LIBS =" 836test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)' 837test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)' 838test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)' 839exec 1>&3 3>&- 840 841test "$srcdir" = "." || ln -sf $srcdir/Makefile . 842 843printf "done\n" 844