1dnl Process this file with autoconf to produce a configure script. 2 3sinclude(../config/enable.m4) 4sinclude(../config/tls.m4) 5sinclude(../config/acx.m4) 6sinclude(../config/no-executables.m4) 7sinclude(../config/lib-ld.m4) 8sinclude(../config/override.m4) 9sinclude(../config/picflag.m4) 10sinclude(../config/dfp.m4) 11sinclude(../config/unwind_ipinfo.m4) 12sinclude(../config/gthr.m4) 13sinclude(../config/sjlj.m4) 14 15AC_PREREQ(2.64) 16AC_INIT([GNU C Runtime Library], 1.0,,[libgcc]) 17AC_CONFIG_SRCDIR([static-object.mk]) 18 19# The libgcc should not depend on any header files 20AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS], 21 [m4_divert_text([DEFAULTS], 22 [ac_includes_default='/* none */'])]) 23 24AC_ARG_WITH(target-subdir, 25[ --with-target-subdir=SUBDIR Configuring in a subdirectory for target]) 26AC_ARG_WITH(cross-host, 27[ --with-cross-host=HOST Configuring with a cross compiler]) 28AC_ARG_WITH(ld, 29[ --with-ld arrange to use the specified ld (full pathname)]) 30 31if test "${srcdir}" = "."; then 32 if test -n "${with_build_subdir}"; then 33 libgcc_topdir="${srcdir}/../.." 34 with_target_subdir= 35 elif test -z "${with_target_subdir}"; then 36 libgcc_topdir="${srcdir}/.." 37 else 38 if test "${with_target_subdir}" != "."; then 39 libgcc_topdir="${srcdir}/${with_multisrctop}../.." 40 else 41 libgcc_topdir="${srcdir}/${with_multisrctop}.." 42 fi 43 fi 44else 45 libgcc_topdir="${srcdir}/.." 46fi 47AC_SUBST(libgcc_topdir) 48AC_CONFIG_AUX_DIR($libgcc_topdir) 49AC_CONFIG_HEADER(auto-target.h:config.in) 50 51AC_ARG_ENABLE(shared, 52[ --disable-shared don't provide a shared libgcc], 53[ 54 case $enable_shared in 55 yes | no) ;; 56 *) 57 enable_shared=no 58 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:," 59 for pkg in $enableval; do 60 if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then 61 enable_shared=yes 62 fi 63 done 64 IFS="$ac_save_ifs" 65 ;; 66 esac 67], [enable_shared=yes]) 68AC_SUBST(enable_shared) 69 70AC_ARG_ENABLE(vtable-verify, 71[ --enable-vtable-verify Enable vtable verification feature ], 72[case "$enableval" in 73 yes) enable_vtable_verify=yes ;; 74 no) enable_vtable_verify=no ;; 75 *) enable_vtable_verify=no;; 76 esac], 77[enable_vtable_verify=no]) 78AC_SUBST(enable_vtable_verify) 79 80AC_ARG_WITH(aix-soname, 81[AS_HELP_STRING([--with-aix-soname=aix|svr4|both], 82 [shared library versioning (aka "SONAME") variant to provide on AIX])], 83[case "${host}:${enable_shared}" in 84 power*-*-aix[[5-9]]*:yes) 85 AC_MSG_CHECKING([which variant of shared library versioning to provide for shared libgcc]) 86 case ${withval} in 87 aix|svr4|both) ;; 88 *) AC_MSG_ERROR([Unknown argument to --with-aix-soname]);; 89 esac 90 AC_MSG_RESULT($withval) 91 ;; 92 *) with_aix_soname=aix ;; 93 esac 94], [with_aix_soname=aix]) 95AC_SUBST(with_aix_soname) 96 97GCC_PICFLAG 98AC_SUBST(PICFLAG) 99 100AC_MSG_CHECKING([for --enable-version-specific-runtime-libs]) 101AC_ARG_ENABLE(version-specific-runtime-libs, 102[ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ], 103[case "$enableval" in 104 yes) version_specific_libs=yes ;; 105 no) version_specific_libs=no ;; 106 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);; 107 esac], 108[version_specific_libs=no]) 109AC_MSG_RESULT($version_specific_libs) 110 111AC_ARG_WITH(slibdir, 112[ --with-slibdir=DIR shared libraries in DIR [LIBDIR]], 113slibdir="$with_slibdir", 114if test "${version_specific_libs}" = yes; then 115 slibdir='$(libsubdir)' 116elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then 117 slibdir='$(exec_prefix)/$(host_noncanonical)/lib' 118else 119 slibdir='$(libdir)' 120fi) 121AC_SUBST(slibdir) 122 123# Command-line options. 124# Very limited version of AC_MAINTAINER_MODE. 125AC_ARG_ENABLE([maintainer-mode], 126 [AC_HELP_STRING([--enable-maintainer-mode], 127 [enable make rules and dependencies not useful (and 128 sometimes confusing) to the casual installer])], 129 [case ${enable_maintainer_mode} in 130 yes) MAINT='' ;; 131 no) MAINT='#' ;; 132 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;; 133 esac 134 maintainer_mode=${enableval}], 135 [MAINT='#']) 136AC_SUBST([MAINT])dnl 137 138AC_PROG_INSTALL 139 140AC_PROG_AWK 141# We need awk; bail out if it's missing. 142case ${AWK} in 143 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;; 144esac 145 146AC_CANONICAL_HOST 147ACX_NONCANONICAL_HOST 148ACX_NONCANONICAL_TARGET 149GCC_TOPLEV_SUBDIRS 150 151# Calculate toolexeclibdir 152# Also toolexecdir, though it's only used in toolexeclibdir 153case ${version_specific_libs} in 154 yes) 155 # Need the gcc compiler version to know where to install libraries 156 # and header files if --enable-version-specific-runtime-libs option 157 # is selected. 158 toolexecdir='$(libdir)/gcc/$(target_noncanonical)' 159 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)' 160 ;; 161 no) 162 if test -n "$with_cross_host" && 163 test x"$with_cross_host" != x"no"; then 164 # Install a library built with a cross compiler in tooldir, not libdir. 165 toolexecdir='$(exec_prefix)/$(target_noncanonical)' 166 toolexeclibdir='$(toolexecdir)/lib' 167 else 168 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)' 169 toolexeclibdir='$(libdir)' 170 fi 171 multi_os_directory=`$CC -print-multi-os-directory` 172 case $multi_os_directory in 173 .) ;; # Avoid trailing /. 174 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;; 175 esac 176 ;; 177esac 178AC_SUBST(toolexecdir) 179AC_SUBST(toolexeclibdir) 180 181dnl These must be called before AM_PROG_LIBTOOL, because it may want 182dnl to call AC_CHECK_PROG. 183AC_CHECK_TOOL(AR, ar) 184AC_CHECK_TOOL(LIPO, lipo, :) 185AC_CHECK_TOOL(NM, nm) 186AC_CHECK_TOOL(RANLIB, ranlib, :) 187AC_CHECK_TOOL(STRIP, strip, :) 188AC_PROG_LN_S 189 190GCC_NO_EXECUTABLES 191AC_PROG_CC 192AC_PROG_CPP_WERROR 193 194AC_CHECK_SIZEOF([double]) 195AC_CHECK_SIZEOF([long double]) 196AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8]) 197AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8]) 198AC_SUBST(double_type_size) 199AC_SUBST(long_double_type_size) 200 201AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \ 202 unistd.h sys/stat.h sys/types.h \ 203 string.h strings.h memory.h) 204AC_HEADER_STDC 205 206# Check for decimal float support. 207AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp], 208 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ 209#include <fenv.h> 210]], [[ 211_Decimal32 x; 212int fe_except = 213 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT; 214]])], 215 [libgcc_cv_dfp=yes], 216 [libgcc_cv_dfp=no])]) 217decimal_float=$libgcc_cv_dfp 218AC_SUBST(decimal_float) 219 220GCC_AC_ENABLE_DECIMAL_FLOAT([$host]) 221 222# Check for fixed-point support. 223AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point], 224 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes], 225 [libgcc_cv_fixed_point=no])]) 226fixed_point=$libgcc_cv_fixed_point 227AC_SUBST(fixed_point) 228 229# For platforms with the unwind ABI which includes an unwind library, 230# libunwind, we can choose to use the system libunwind. 231# config.gcc also contains tests of with_system_libunwind. 232GCC_CHECK_UNWIND_GETIPINFO 233 234# Check if the compiler is configured for setjmp/longjmp exceptions. 235GCC_CHECK_SJLJ_EXCEPTIONS 236 237AC_ARG_ENABLE([explicit-exception-frame-registration], 238 [AC_HELP_STRING([--enable-explicit-exception-frame-registration], 239 [register exception tables explicitly at module start, for use 240 e.g. for compatibility with installations without PT_GNU_EH_FRAME support])], 241[ 242force_explicit_eh_registry= 243if test "$enable_explicit_exception_frame_registration" = yes; then 244 if test $ac_cv_sjlj_exceptions = yes; then 245 AC_MSG_ERROR([Can't --enable-explicit-exception-frame-registration 246 with setjmp/longjmp exceptions]) 247 fi 248 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS 249fi 250]) 251AC_SUBST([force_explicit_eh_registry]) 252 253AC_LIB_PROG_LD_GNU 254 255AC_MSG_CHECKING([for thread model used by GCC]) 256target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'` 257AC_MSG_RESULT([$target_thread_file]) 258 259# Check for assembler CFI support. 260AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi], 261 [AC_COMPILE_IFELSE( 262[asm("\n\ 263 .text\n\ 264 .cfi_startproc\n\ 265 .cfi_personality 0, symbol\n\ 266 .cfi_endproc");], 267 [libgcc_cv_cfi=yes], 268 [libgcc_cv_cfi=no])]) 269 270# Check 32bit or 64bit. In the case of MIPS, this really determines the 271# word size rather than the address size. 272cat > conftest.c <<EOF 273#if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \ 274 || defined(__mips64) 275host_address=64 276#else 277host_address=32 278#endif 279EOF 280eval `${CC-cc} -E conftest.c | grep host_address=` 281rm -f conftest.c 282 283case ${host} in 284mips*-*-*) 285 AC_CACHE_CHECK([whether the target is hard-float], 286 [libgcc_cv_mips_hard_float], 287 [AC_COMPILE_IFELSE( 288 [#ifndef __mips_hard_float 289 #error FOO 290 #endif], 291 [libgcc_cv_mips_hard_float=yes], 292 [libgcc_cv_mips_hard_float=no])]) 293esac 294 295case ${host} in 296*-*-solaris2*) 297 # Check for system-provided CRTs on Solaris 11.4. 298 AC_CACHE_CHECK([system-provided CRTs on Solaris], 299 [libgcc_cv_solaris_crts], 300 [libgcc_cv_solaris_crts=no 301 libgcc_sysroot="`${CC} -print-sysroot`" 302 libgcc_libdir="$libgcc_sysroot/usr/lib" 303 # At the time they were added, gcrt1.o became a symlink for backwards 304 # compatibility on x86, while crt1.o was added on sparc, so check for that. 305 case ${host} in 306 i?86-*-solaris2* | x86_64-*-solaris2*) 307 if test -h "$libgcc_libdir/gcrt1.o"; then libgcc_cv_solaris_crts=yes; fi 308 ;; 309 sparc*-*-solaris2*) 310 if test -f "$libgcc_libdir/crt1.o"; then libgcc_cv_solaris_crts=yes; fi 311 ;; 312 esac]) 313 if test $libgcc_cv_solaris_crts = yes; then 314 AC_DEFINE(HAVE_SOLARIS_CRTS, 1, 315 [Define if the system-provided CRTs are present on Solaris.]) 316 fi 317 ;; 318esac 319 320# Determine the version of glibc, if any, used on the target. 321AC_MSG_CHECKING([for target glibc version]) 322AC_ARG_WITH([glibc-version], 323 [AS_HELP_STRING([--with-glibc-version=M.N], 324 [assume GCC used with glibc version M.N or later])], [ 325if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then 326 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'` 327 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'` 328else 329 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N]) 330fi], [ 331AC_COMPUTE_INT([glibc_version_major], [__GLIBC__], 332 [#include <features.h>], 333 [glibc_version_major=0]) 334AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__], 335 [#include <features.h>], 336 [glibc_version_minor=0])]) 337AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor]) 338 339# Determine floating-point type for powerpc*-*-linux*. 340# Single-precision-only FPRs are not a supported configuration for 341# this target, so are not allowed for in this test. 342case ${host} in 343powerpc*-*-linux*) 344 cat > conftest.c <<EOF 345#ifdef __powerpc64__ 346ppc_fp_type=64 347#elif defined _SOFT_FLOAT 348ppc_fp_type=soft 349#elif defined _SOFT_DOUBLE 350ppc_fp_type=e500v1 351#elif defined __NO_FPRS__ 352ppc_fp_type=e500v2 353#else 354ppc_fp_type=hard 355#endif 356EOF 357eval `${CC-cc} -E conftest.c | grep ppc_fp_type=` 358rm -f conftest.c 359# glibc 2.19 and later provide all the soft-fp functions, with proper 360# interactions with <fenv.h> exception and rounding mode handling, so 361# make libgcc's versions into compat symbols if a recent enough glibc 362# version is being used. 363ppc_fp_compat= 364case ${ppc_fp_type} in 365soft|e500v1|e500v2) 366 if test $glibc_version_major -gt 2 \ 367 || ( test $glibc_version_major -eq 2 \ 368 && test $glibc_version_minor -ge 19 ); then 369 ppc_fp_compat="t-softfp-compat" 370 fi 371 ;; 372esac 373;; 374esac 375 376case ${host} in 377# At present, we cannot turn -mfloat128 on via #pragma GCC target, 378# so just check if we have VSX (ISA 2.06) support to build the 379# software libraries, and whether the assembler can handle xsaddqp 380# for hardware support. 381powerpc*-*-linux*) 382 AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries], 383 [libgcc_cv_powerpc_float128], 384 [AC_COMPILE_IFELSE( 385 [#pragma GCC target ("vsx") 386 vector double dadd (vector double a, vector double b) { return a + b; }], 387 [libgcc_cv_powerpc_float128=yes], 388 [libgcc_cv_powerpc_float128=no])]) 389 390 AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries], 391 [libgcc_cv_powerpc_float128_hw], 392 [AC_COMPILE_IFELSE( 393 [#pragma GCC target ("vsx,power9-vector") 394 #include <sys/auxv.h> 395 #ifndef AT_PLATFORM 396 #error "AT_PLATFORM is not defined" 397 #endif 398 vector unsigned char (vector unsigned char a, vector unsigned char b) 399 { 400 vector unsigned char ret; 401 __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b)); 402 return ret; 403 } 404 void *add_resolver (void) { return (void *) add; } 405 __float128 add_ifunc (__float128, __float128) 406 __attribute__ ((__ifunc__ ("add_resolver")));], 407 [libgcc_cv_powerpc_float128_hw=yes], 408 [libgcc_cv_powerpc_float128_hw=no])]) 409esac 410 411# Collect host-machine-specific information. 412. ${srcdir}/config.host 413 414# Used for constructing correct paths for offload compilers. 415accel_dir_suffix= 416real_host_noncanonical=${host_noncanonical} 417if test x"$enable_as_accelerator_for" != x; then 418 accel_dir_suffix=/accel/${target_noncanonical} 419 real_host_noncanonical=${enable_as_accelerator_for} 420fi 421AC_SUBST(accel_dir_suffix) 422AC_SUBST(real_host_noncanonical) 423 424if test x"$enable_offload_targets" != x; then 425 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o crtoffloadtable.o" 426fi 427 428# Check if Solaris/x86 linker supports ZERO terminator unwind entries. 429# This is after config.host so we can augment tmake_file. 430# Link with -nostartfiles -nodefaultlibs since neither are present while 431# building libgcc. 432case ${host} in 433i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*) 434 cat > conftest.s <<EOF 435 .section .eh_frame,"a",@unwind 436 .zero 4 437 .section .jcr,"aw",@progbits 438 .zero 8 439EOF 440 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then 441 tmake_file="${tmake_file} i386/t-crtstuff" 442 fi 443 ;; 444esac 445 446# Check if xtensa target is configured for windowed ABI and thus needs to use 447# custom unwind code. 448# This is after config.host so we can augment tmake_file. 449case ${host} in 450xtensa*-*) 451 cat > conftest.c <<EOF 452 #ifdef __XTENSA_CALL0_ABI__ 453 #error 454 #endif 455EOF 456 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then 457 tmake_file="${tmake_file} xtensa/t-windowed" 458 fi 459 ;; 460esac 461 462# Check for visibility support. This is after config.host so that 463# we can check for asm_hidden_op. 464AC_CACHE_CHECK([for __attribute__((visibility("hidden")))], 465 libgcc_cv_hidden_visibility_attribute, [ 466 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c 467 libgcc_cv_hidden_visibility_attribute=no 468 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then 469 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then 470 libgcc_cv_hidden_visibility_attribute=yes 471 fi 472 fi 473 rm -f conftest.* 474 ]) 475 476if test $libgcc_cv_hidden_visibility_attribute = yes; then 477 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS' 478else 479 vis_hide= 480fi 481AC_SUBST(vis_hide) 482 483# See if we have thread-local storage. We can only test assembler 484# since link-time and run-time tests require the newly built 485# gcc, which can't be used to build executable due to that libgcc 486# is yet to be built here. 487GCC_CHECK_CC_TLS 488set_have_cc_tls= 489if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then 490 set_have_cc_tls="-DHAVE_CC_TLS" 491fi 492AC_SUBST(set_have_cc_tls) 493 494# See if we have emulated thread-local storage. 495GCC_CHECK_EMUTLS 496set_use_emutls= 497if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then 498 set_use_emutls="-DUSE_EMUTLS" 499fi 500AC_SUBST(set_use_emutls) 501 502AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [ 503AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, 504 [[void ip (void) __attribute__ ((constructor (1)));]])], 505 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])]) 506if test $libgcc_cv_init_priority = yes; then 507 AC_DEFINE(HAVE_INIT_PRIORITY, 1, 508 [Define if the compiler supports init priority.]) 509fi 510 511# Conditionalize the sfp-machine.h header for this target machine. 512if test -z "${sfp_machine_header}"; then 513 sfp_machine_header=$cpu_type/sfp-machine.h 514 if test -f ${srcdir}/config/${sfp_machine_header}; then 515 : 516 else 517 sfp_machine_header=no-sfp-machine.h 518 fi 519fi 520AC_SUBST(sfp_machine_header) 521 522# Conditionalize the makefile for this target machine. 523tmake_file_= 524for f in ${tmake_file} 525do 526 if test -f ${srcdir}/config/$f 527 then 528 tmake_file_="${tmake_file_} \$(srcdir)/config/$f" 529 fi 530done 531tmake_file="${tmake_file_}" 532AC_SUBST(tmake_file) 533 534# Likewise export definitions for libgcc_tm.h 535tm_file_= 536for f in ${tm_file} 537do 538 tm_file_="${tm_file_} \$(srcdir)/config/$f" 539done 540tm_file="${tm_file_}" 541AC_SUBST(tm_file) 542AC_SUBST(tm_defines) 543 544# Map from thread model to thread header. 545GCC_AC_THREAD_HEADER([$target_thread_file]) 546 547# Substitute configuration variables 548AC_SUBST(cpu_type) 549AC_SUBST(extra_parts) 550AC_SUBST(asm_hidden_op) 551AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack]) 552AC_CONFIG_LINKS([unwind.h:$unwind_header]) 553AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header]) 554AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header]) 555AC_CONFIG_LINKS([gthr-default.h:$thread_header]) 556 557# We need multilib support. 558AC_CONFIG_FILES([Makefile]) 559AC_CONFIG_COMMANDS([default], 560 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h 561if test -n "$CONFIG_FILES"; then 562 # FIXME: We shouldn't need to set ac_file 563 ac_file=Makefile 564 . ${libgcc_topdir}/config-ml.in 565fi]], 566[[srcdir=${srcdir} 567host=${host} 568with_target_subdir=${with_target_subdir} 569with_multisubdir=${with_multisubdir} 570ac_configure_args="--enable-multilib ${ac_configure_args}" 571CONFIG_SHELL=${CONFIG_SHELL-/bin/sh} 572libgcc_topdir=${libgcc_topdir} 573CC="${CC}" 574]]) 575AC_OUTPUT 576