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dnl Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc. dnl dnl This file is part of GCC. dnl dnl GCC is free software; you can redistribute it and/or modify dnl it under the terms of the GNU General Public License as published by dnl the Free Software Foundation; either version 3, or (at your option) dnl any later version. dnl dnl GCC is distributed in the hope that it will be useful, dnl but WITHOUT ANY WARRANTY; without even the implied warranty of dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the dnl GNU General Public License for more details. dnl dnl You should have received a copy of the GNU General Public License dnl along with GCC; see the file COPYING3. If not see dnl <http://www.gnu.org/licenses/>. dnl See whether we need a declaration for a function. dnl The result is highly dependent on the INCLUDES passed in, so make sure dnl to use a different cache variable name in this macro if it is invoked dnl in a different context somewhere else. dnl gcc_AC_CHECK_DECL(SYMBOL, dnl [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, INCLUDES]]]) AC_DEFUN([gcc_AC_CHECK_DECL], [AC_MSG_CHECKING([whether $1 is declared]) AC_CACHE_VAL(gcc_cv_have_decl_$1, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [#ifndef $1 char *(*pfn) = (char *(*)) $1 ; #endif])], eval "gcc_cv_have_decl_$1=yes", eval "gcc_cv_have_decl_$1=no")]) if eval "test \"`echo '$gcc_cv_have_decl_'$1`\" = yes"; then AC_MSG_RESULT(yes) ; ifelse([$2], , :, [$2]) else AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3]) fi ])dnl dnl Check multiple functions to see whether each needs a declaration. dnl Arrange to define HAVE_DECL_<FUNCTION> to 0 or 1 as appropriate. dnl gcc_AC_CHECK_DECLS(SYMBOLS, dnl [ACTION-IF-NEEDED [, ACTION-IF-NOT-NEEDED [, INCLUDES]]]) AC_DEFUN([gcc_AC_CHECK_DECLS], [AC_FOREACH([gcc_AC_Func], [$1], [AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_[]gcc_AC_Func), [Define to 1 if we found a declaration for ']gcc_AC_Func[', otherwise define to 0.])])dnl for ac_func in $1 do ac_tr_decl=AS_TR_CPP([HAVE_DECL_$ac_func]) gcc_AC_CHECK_DECL($ac_func, [AC_DEFINE_UNQUOTED($ac_tr_decl, 1) $2], [AC_DEFINE_UNQUOTED($ac_tr_decl, 0) $3], dnl It is possible that the include files passed in here are local headers dnl which supply a backup declaration for the relevant prototype based on dnl the definition of (or lack of) the HAVE_DECL_ macro. If so, this test dnl will always return success. E.g. see libiberty.h's handling of dnl `basename'. To avoid this, we define the relevant HAVE_DECL_ macro to dnl 1 so that any local headers used do not provide their own prototype dnl during this test. #undef $ac_tr_decl #define $ac_tr_decl 1 $4 ) done ]) dnl 'make compare' can be significantly faster, if cmp itself can dnl skip bytes instead of using tail. The test being performed is dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2" dnl but we need to sink errors and handle broken shells. We also test dnl for the parameter format "cmp file1 file2 skip1 skip2" which is dnl accepted by cmp on some systems. AC_DEFUN([gcc_AC_PROG_CMP_IGNORE_INITIAL], [AC_CACHE_CHECK([for cmp's capabilities], gcc_cv_prog_cmp_skip, [ echo abfoo >t1 echo cdfoo >t2 gcc_cv_prog_cmp_skip=slowcompare if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then : else gcc_cv_prog_cmp_skip=gnucompare fi fi if test $gcc_cv_prog_cmp_skip = slowcompare ; then if cmp t1 t2 2 2 > /dev/null 2>&1; then if cmp t1 t2 1 1 > /dev/null 2>&1; then : else gcc_cv_prog_cmp_skip=fastcompare fi fi fi rm t1 t2 ]) make_compare_target=$gcc_cv_prog_cmp_skip AC_SUBST(make_compare_target) ]) dnl See if symbolic links work and if not, try to substitute either hard links or simple copy. AC_DEFUN([gcc_AC_PROG_LN_S], [AC_MSG_CHECKING(whether ln -s works) AC_CACHE_VAL(gcc_cv_prog_LN_S, [rm -f conftestdata_t echo >conftestdata_f if ln -s conftestdata_f conftestdata_t 2>/dev/null then gcc_cv_prog_LN_S="ln -s" else if ln conftestdata_f conftestdata_t 2>/dev/null then gcc_cv_prog_LN_S=ln else if cp -p conftestdata_f conftestdata_t 2>/dev/null then gcc_cv_prog_LN_S="cp -p" else gcc_cv_prog_LN_S=cp fi fi fi rm -f conftestdata_f conftestdata_t ])dnl LN_S="$gcc_cv_prog_LN_S" if test "$gcc_cv_prog_LN_S" = "ln -s"; then AC_MSG_RESULT(yes) else if test "$gcc_cv_prog_LN_S" = "ln"; then AC_MSG_RESULT([no, using ln]) else AC_MSG_RESULT([no, and neither does ln, so using $gcc_cv_prog_LN_S]) fi fi AC_SUBST(LN_S)dnl ]) dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead dnl of the usual 2. AC_DEFUN([gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG], [AC_CACHE_CHECK([if mkdir takes one argument], gcc_cv_mkdir_takes_one_arg, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include <sys/types.h> #ifdef HAVE_SYS_STAT_H # include <sys/stat.h> #endif #ifdef HAVE_UNISTD_H # include <unistd.h> #endif #ifdef HAVE_DIRECT_H # include <direct.h> #endif], [mkdir ("foo", 0);])], gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)]) if test $gcc_cv_mkdir_takes_one_arg = yes ; then AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a single argument.]) fi ]) AC_DEFUN([gcc_AC_PROG_INSTALL], [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl # Find a good install program. We prefer a C program (faster), # so one script is as good as another. But avoid the broken or # incompatible versions: # SysV /etc/install, /usr/sbin/install # SunOS /usr/etc/install # IRIX /sbin/install # AIX /bin/install # AFS /usr/afsws/bin/install, which mishandles nonexistent args # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff" # ./install, which can be erroneously created by make from ./install.sh. AC_MSG_CHECKING(for a BSD compatible install) if test -z "$INSTALL"; then AC_CACHE_VAL(ac_cv_path_install, [ IFS="${IFS= }"; ac_save_IFS="$IFS"; IFS="${IFS}:" for ac_dir in $PATH; do # Account for people who put trailing slashes in PATH elements. case "$ac_dir/" in /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;; *) # OSF1 and SCO ODT 3.0 have their own names for install. for ac_prog in ginstall scoinst install; do if test -f $ac_dir/$ac_prog; then if test $ac_prog = install && grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then # AIX install. It has an incompatible calling convention. # OSF/1 installbsd also uses dspmsg, but is usable. : else ac_cv_path_install="$ac_dir/$ac_prog -c" break 2 fi fi done ;; esac done IFS="$ac_save_IFS" ])dnl if test "${ac_cv_path_install+set}" = set; then INSTALL="$ac_cv_path_install" else # As a last resort, use the slow shell script. We don't cache a # path for INSTALL within a source directory, because that will # break other packages using the cache if that directory is # removed, or if the path is relative. INSTALL="$ac_install_sh" fi fi dnl We do special magic for INSTALL instead of AC_SUBST, to get dnl relative paths right. AC_MSG_RESULT($INSTALL) AC_SUBST(INSTALL)dnl # Use test -z because SunOS4 sh mishandles braces in ${var-val}. # It thinks the first close brace ends the variable substitution. test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}' AC_SUBST(INSTALL_PROGRAM)dnl test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644' AC_SUBST(INSTALL_DATA)dnl ]) # mmap(2) blacklisting. Some platforms provide the mmap library routine # but don't support all of the features we need from it. AC_DEFUN([gcc_AC_FUNC_MMAP_BLACKLIST], [ AC_CHECK_HEADER([sys/mman.h], [gcc_header_sys_mman_h=yes], [gcc_header_sys_mman_h=no]) AC_CHECK_FUNC([mmap], [gcc_func_mmap=yes], [gcc_func_mmap=no]) if test "$gcc_header_sys_mman_h" != yes \ || test "$gcc_func_mmap" != yes; then gcc_cv_func_mmap_file=no gcc_cv_func_mmap_dev_zero=no gcc_cv_func_mmap_anon=no else AC_CACHE_CHECK([whether read-only mmap of a plain file works], gcc_cv_func_mmap_file, [# Add a system to this blacklist if # mmap(0, stat_size, PROT_READ, MAP_PRIVATE, fd, 0) doesn't return a # memory area containing the same data that you'd get if you applied # read() to the same fd. The only system known to have a problem here # is VMS, where text files have record structure. case "$host_os" in vms* | ultrix*) gcc_cv_func_mmap_file=no ;; *) gcc_cv_func_mmap_file=yes;; esac]) AC_CACHE_CHECK([whether mmap from /dev/zero works], gcc_cv_func_mmap_dev_zero, [# Add a system to this blacklist if it has mmap() but /dev/zero # does not exist, or if mmapping /dev/zero does not give anonymous # zeroed pages with both the following properties: # 1. If you map N consecutive pages in with one call, and then # unmap any subset of those pages, the pages that were not # explicitly unmapped remain accessible. # 2. If you map two adjacent blocks of memory and then unmap them # both at once, they must both go away. # Systems known to be in this category are Windows (all variants), # VMS, and Darwin. case "$host_os" in vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00) gcc_cv_func_mmap_dev_zero=no ;; *) gcc_cv_func_mmap_dev_zero=yes;; esac]) # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for. AC_CACHE_CHECK([for MAP_ANON(YMOUS)], gcc_cv_decl_map_anon, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [#include <sys/types.h> #include <sys/mman.h> #include <unistd.h> #ifndef MAP_ANONYMOUS #define MAP_ANONYMOUS MAP_ANON #endif ], [int n = MAP_ANONYMOUS;])], gcc_cv_decl_map_anon=yes, gcc_cv_decl_map_anon=no)]) if test $gcc_cv_decl_map_anon = no; then gcc_cv_func_mmap_anon=no else AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works], gcc_cv_func_mmap_anon, [# Add a system to this blacklist if it has mmap() and MAP_ANON or # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) # doesn't give anonymous zeroed pages with the same properties listed # above for use of /dev/zero. # Systems known to be in this category are Windows, VMS, and SCO Unix. case "$host_os" in vms* | cygwin* | pe | mingw* | sco* | udk* ) gcc_cv_func_mmap_anon=no ;; *) gcc_cv_func_mmap_anon=yes;; esac]) fi fi if test $gcc_cv_func_mmap_file = yes; then AC_DEFINE(HAVE_MMAP_FILE, 1, [Define if read-only mmap of a plain file works.]) fi if test $gcc_cv_func_mmap_dev_zero = yes; then AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1, [Define if mmap of /dev/zero works.]) fi if test $gcc_cv_func_mmap_anon = yes; then AC_DEFINE(HAVE_MMAP_ANON, 1, [Define if mmap with MAP_ANON(YMOUS) works.]) fi ]) dnl Determine if enumerated bitfields are unsigned. ISO C says they can dnl be either signed or unsigned. dnl AC_DEFUN([gcc_AC_C_ENUM_BF_UNSIGNED], [AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned, [AC_RUN_IFELSE([AC_LANG_SOURCE([#include <stdlib.h> enum t { BLAH = 128 } ; struct s_t { enum t member : 8; } s ; int main(void) { s.member = BLAH; if (s.member < 0) exit(1); exit(0); }])], gcc_cv_enum_bf_unsigned=yes, gcc_cv_enum_bf_unsigned=no, gcc_cv_enum_bf_unsigned=yes)]) if test $gcc_cv_enum_bf_unsigned = yes; then AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1, [Define if enumerated bitfields are treated as unsigned values.]) fi]) dnl Probe number of bits in a byte. dnl Note C89 requires CHAR_BIT >= 8. dnl AC_DEFUN([gcc_AC_C_CHAR_BIT], [AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit, [AC_EGREP_CPP(found, [#ifdef HAVE_LIMITS_H #include <limits.h> #endif #ifdef CHAR_BIT found #endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no) ]) if test $gcc_cv_decl_char_bit = no; then AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby, [i=8 gcc_cv_c_nbby= while test $i -lt 65; do AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [switch(0) { case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i): case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)): ; }])], [gcc_cv_c_nbby=$i; break]) i=`expr $i + 1` done test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed ]) if test $gcc_cv_c_nbby = failed; then AC_MSG_ERROR(cannot determine number of bits in a byte) else AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby, [Define as the number of bits in a byte, if `limits.h' doesn't.]) fi fi]) AC_DEFUN([gcc_AC_INITFINI_ARRAY], [AC_ARG_ENABLE(initfini-array, [ --enable-initfini-array use .init_array/.fini_array sections], [], [ AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support, gcc_cv_initfini_array, [dnl AC_RUN_IFELSE([AC_LANG_SOURCE([ static int x = -1; int main (void) { return x; } int foo (void) { x = 0; } int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;])], [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no], [gcc_cv_initfini_array=no])]) enable_initfini_array=$gcc_cv_initfini_array ]) if test $enable_initfini_array = yes; then AC_DEFINE(HAVE_INITFINI_ARRAY, 1, [Define .init_array/.fini_array sections are available and working.]) fi]) dnl # _gcc_COMPUTE_GAS_VERSION dnl # Used by gcc_GAS_VERSION_GTE_IFELSE dnl # dnl # WARNING: dnl # gcc_cv_as_gas_srcdir must be defined before this. dnl # This gross requirement will go away eventually. AC_DEFUN([_gcc_COMPUTE_GAS_VERSION], [gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd for f in $gcc_cv_as_bfd_srcdir/configure \ $gcc_cv_as_gas_srcdir/configure \ $gcc_cv_as_gas_srcdir/configure.in \ $gcc_cv_as_gas_srcdir/Makefile.in ; do gcc_cv_gas_version=`sed -n -e 's/^[[ ]]*\(VERSION=[[0-9]]*\.[[0-9]]*.*\)/\1/p' < $f` if test x$gcc_cv_gas_version != x; then break fi done gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"` gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"` gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"` case $gcc_cv_gas_patch_version in "") gcc_cv_gas_patch_version="0" ;; esac gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \ + $gcc_cv_gas_minor_version \) \* 1000 \ + $gcc_cv_gas_patch_version` ]) []dnl # _gcc_COMPUTE_GAS_VERSION dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel, dnl # [command_if_true = :], [command_if_false = :]) dnl # Check to see if the version of GAS is greater than or dnl # equal to the specified version. dnl # dnl # The first ifelse() shortens the shell code if the patchlevel dnl # is unimportant (the usual case). The others handle missing dnl # commands. Note that the tests are structured so that the most dnl # common version number cases are tested first. AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE], [ifelse([$1], elf, [if test $in_tree_gas_is_elf = yes \ &&], [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4` then dnl ifelse([$5],,:,[$5])[]dnl ifelse([$6],,,[ else $6]) fi]) AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE], [AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)], [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])]) dnl # gcc_GAS_FLAGS dnl # Used by gcc_GAS_CHECK_FEATURE dnl # AC_DEFUN([gcc_GAS_FLAGS], [AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags, [ case "$target" in i[[34567]]86-*-linux*) dnl Always pass --32 to ia32 Linux assembler. gcc_cv_as_flags="--32" ;; *) gcc_cv_as_flags=" " ;; esac]) ]) dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel], dnl [extra switches to as], [assembler input], dnl [extra testing logic], [command if feature available]) dnl dnl Checks for an assembler feature. If we are building an in-tree dnl gas, the feature is available if the associated assembler version dnl is greater than or equal to major.minor.patchlevel. If not, then dnl ASSEMBLER INPUT is fed to the assembler and the feature is available dnl if assembly succeeds. If EXTRA TESTING LOGIC is not the empty string, dnl then it is run instead of simply setting CV to "yes" - it is responsible dnl for doing so, if appropriate. AC_DEFUN([gcc_GAS_CHECK_FEATURE], [AC_REQUIRE([gcc_GAS_FLAGS])dnl AC_CACHE_CHECK([assembler for $1], [$2], [[$2]=no ifelse([$3],,,[dnl if test $in_tree_gas = yes; then gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes]) el])if test x$gcc_cv_as != x; then echo ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]') > conftest.s if AC_TRY_COMMAND([$gcc_cv_as $gcc_cv_as_flags $4 -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD]) then ifelse([$6],, [$2]=yes, [$6]) else echo "configure: failed program was" >&AS_MESSAGE_LOG_FD cat conftest.s >&AS_MESSAGE_LOG_FD fi rm -f conftest.o conftest.s fi]) ifelse([$7],,,[dnl if test $[$2] = yes; then $7 fi])]) dnl GCC_TARGET_TEMPLATE(KEY) dnl ------------------------ dnl Define KEY as a valid configure key on the target machine. m4_define([GCC_TARGET_TEMPLATE], [m4_define([GCC_TARGET_TEMPLATE($1)],[])]) dnl AH_TEMPLATE(KEY, DESCRIPTION) dnl ----------------------------- dnl Issue an autoheader template for KEY, i.e., a comment composed of dnl DESCRIPTION (properly wrapped), and then #undef KEY. Redefinition dnl of the macro in autoheader.m4, to support definition of only a few dnl keys while compiling target libraries. m4_define([AH_TEMPLATE], [AH_VERBATIM([$1],m4_text_wrap([$2 */], [ ], [/* ]) m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[#ifndef USED_FOR_TARGET ])[#undef $1]m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[ #endif ]))]) dnl Make sure that build_exeext is looked for AC_DEFUN([gcc_AC_BUILD_EXEEXT], [ ac_executable_extensions="$build_exeext"])
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