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*) xsrcdir=$srcdir/ ;; esac test -n "$enable_debug_configure" && echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2 for implies_file in Implies Implies-before Implies-after; do implies_type=`echo $implies_file | sed s/-/_/` eval ${implies_type}= if test -f $xsrcdir$name/$implies_file; then # Collect more names from the `Implies' file (removing comments). implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`" for x in $implied_candidate; do found=no if test -d $xsrcdir$name_base/$x; then eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\"" found=yes fi for d in $add_ons_pfx ''; do try="${d}sysdeps/$x" case $d in /*) try_srcdir= ;; *) try_srcdir=$srcdir/ ;; esac test -n "$enable_debug_configure" && echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try; then eval "${implies_type}=\"\$${implies_type} \$try\"" found=yes case "$sysnames_add_ons" in *" $d "*) ;; *|'') sysnames_add_ons="$sysnames_add_ons $d" ;; esac fi done if test $found = no; then AC_MSG_WARN($name/$implies_file specifies nonexistent $x) fi done fi done # Add NAME to the list of names. names="$names $name" # Find the parent of NAME, using the empty string if it has none. changequote(,)dnl parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`" changequote([,])dnl test -n "$enable_debug_configure" && echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \ Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2 # Add the names implied by NAME, and NAME's parent (if it has one), to # the list of names to be processed (the argument list). We prepend the # implied names to the list and append the parent. We want implied # directories to come before further directories inferred from the # configuration components; this ensures that for sysv4, unix/common # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*) # after sysv4). sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`" test -n "$sysnames" && set $sysnames done # Add the default directories. default_sysnames="sysdeps/generic" sysnames="$names $default_sysnames" AC_SUBST(sysnames) # The other names were emitted during the scan. AC_MSG_RESULT($default_sysnames) # Collect the list of add-ons that supply partial sysdeps trees. sysdeps_add_ons= for add_on in $add_ons; do case "$add_on" in /*) xsrcdir= ;; *) xsrcdir="$srcdir/" ;; esac test -d "$xsrcdir$add_on/sysdeps" || { case "$configured_add_ons " in *" $add_on "*) ;; *|'') AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree) ;; esac continue } sysdeps_add_ons="$sysdeps_add_ons $add_on" case "$sysnames_add_ons" in *" $add_on/ "*) ;; *|'') AC_MSG_WARN(add-on $add_on contributed no sysdeps directories) continue ;; esac found=no for d in $sysnames; do case "$d" in $add_on/sysdeps/*) ;; *) continue ;; esac (cd "$xsrcdir$d" && for f in *[[!~]]; do case "$f" in sys|bits) for ff in $f/*.h; do test -d "$ff" || { test -e "$ff" && exit 88; } done ;; *) test -d "$f" || { test -e "$f" && exit 88; } ;; esac done) if test $? -eq 88; then found=yes break fi done if test $found = no; then AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories) fi done AC_SUBST(sysdeps_add_ons) ### Locate tools. AC_PROG_INSTALL if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then # The makefiles need to use a different form to find it in $srcdir. INSTALL='\$(..)./scripts/install-sh -c' fi AC_PROG_LN_S LIBC_PROG_BINUTILS # Accept binutils 2.22 or newer. AC_CHECK_PROG_VER(AS, $AS, --version, [GNU assembler.* \([0-9]*\.[0-9.]*\)], [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as") AC_CHECK_PROG_VER(LD, $LD, --version, [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)], [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld") # These programs are version sensitive. AC_CHECK_TOOL_PREFIX AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version, [GNU Make[^0-9]*\([0-9][0-9.]*\)], [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make") AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version, [GNU gettext.* \([0-9]*\.[0-9.]*\)], [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*], MSGFMT=: aux_missing="$aux_missing msgfmt") AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version, [GNU texinfo.* \([0-9][0-9.]*\)], [4.[7-9]*|4.[1-9][0-9]*|[5-9].*], MAKEINFO=: aux_missing="$aux_missing makeinfo") AC_CHECK_PROG_VER(SED, sed, --version, [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)], [3.0[2-9]*|3.[1-9]*|[4-9]*], SED=: aux_missing="$aux_missing sed") AC_CHECK_PROG_VER(AWK, gawk, --version, [GNU Awk[^0-9]*\([0-9][0-9.]*\)], [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk") AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [ AC_TRY_COMPILE([], [ #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) #error insufficient compiler #endif], [libc_cv_compiler_ok=yes], [libc_cv_compiler_ok=no])]) AS_IF([test $libc_cv_compiler_ok != yes], [critic_missing="$critic_missing compiler"]) AC_CHECK_TOOL(NM, nm, false) if test "x$maintainer" = "xyes"; then AC_CHECK_PROGS(AUTOCONF, autoconf, no) case "x$AUTOCONF" in xno|x|x:) AUTOCONF=no ;; *) AC_CACHE_CHECK(dnl whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then libc_cv_autoconf_works=yes else libc_cv_autoconf_works=no fi]) test $libc_cv_autoconf_works = yes || AUTOCONF=no ;; esac if test "x$AUTOCONF" = xno; then aux_missing="$aux_missing autoconf" fi else AUTOCONF=no fi test -n "$critic_missing" && AC_MSG_ERROR([ *** These critical programs are missing or too old:$critic_missing *** Check the INSTALL file for required versions.]) test -n "$aux_missing" && AC_MSG_WARN([ *** These auxiliary programs are missing or incompatible versions:$aux_missing *** some features will be disabled. *** Check the INSTALL file for required versions.]) # if using special system headers, find out the compiler's sekrit # header directory and add that to the list. NOTE: Only does the right # thing on a system that doesn't need fixincludes. (Not presently a problem.) if test -n "$sysheaders"; then SYSINCLUDES=-nostdinc for d in include include-fixed; do i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" && SYSINCLUDES="$SYSINCLUDES -isystem $i" done SYSINCLUDES="$SYSINCLUDES \ -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`" if test -n "$CXX"; then CXX_SYSINCLUDES= for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \ | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do test "x$cxxheaders" != x && CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders" done fi fi AC_SUBST(SYSINCLUDES) AC_SUBST(CXX_SYSINCLUDES) # Test if LD_LIBRARY_PATH contains the notation for the current directory # since this would lead to problems installing/building glibc. # LD_LIBRARY_PATH contains the current directory if one of the following # is true: # - one of the terminals (":" and ";") is the first or last sign # - two terminals occur directly after each other # - the path contains an element with a dot in it AC_MSG_CHECKING(LD_LIBRARY_PATH variable) changequote(,)dnl case ${LD_LIBRARY_PATH} in [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* ) ld_library_path_setting="contains current directory" ;; *) ld_library_path_setting="ok" ;; esac changequote([,])dnl AC_MSG_RESULT($ld_library_path_setting) if test "$ld_library_path_setting" != "ok"; then AC_MSG_ERROR([ *** LD_LIBRARY_PATH shouldn't contain the current directory when *** building glibc. Please change the environment variable *** and run configure again.]) fi AC_PATH_PROG(BASH_SHELL, bash, no) AC_PATH_PROG(PERL, perl, no) if test "$PERL" != no && (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then PERL=no fi AC_PATH_PROG(INSTALL_INFO, install-info, no, $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin) AC_CHECK_PROG_VER(BISON, bison, --version, [bison (GNU Bison) \([0-9]*\.[0-9.]*\)], [2.7*|[3-9].*|[1-9][0-9]*], BISON=no) AC_CACHE_CHECK(whether we need to use -P to assemble .S files, libc_cv_need_minus_P, [dnl cat > conftest.S <&AS_MESSAGE_LOG_FD); then libc_cv_need_minus_P=no else libc_cv_need_minus_P=yes fi rm -f conftest*]) if test $libc_cv_need_minus_P = yes; then config_vars="$config_vars asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives." fi AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl cat > conftest.s < conftest1.c <<\EOF extern int glibc_conftest_frobozz; void _start() { glibc_conftest_frobozz = 1; } EOF if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ -nostartfiles -nostdlib \ -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then libc_cv_asm_set_directive=yes else libc_cv_asm_set_directive=no fi rm -f conftest*]) if test $libc_cv_asm_set_directive = yes; then AC_DEFINE(HAVE_ASM_SET_DIRECTIVE) fi AC_CACHE_CHECK(for assembler gnu_unique_object symbol type, libc_cv_asm_unique_object, [dnl cat > conftest.s <&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then libc_cv_asm_unique_object=yes else libc_cv_asm_unique_object=no fi rm -f conftest*]) if test $libc_cv_asm_unique_object = yes; then AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT) fi AC_CACHE_CHECK(for .protected and .hidden assembler directive, libc_cv_asm_protected_directive, [dnl cat > conftest.s <&AS_MESSAGE_LOG_FD); then libc_cv_asm_protected_directive=yes else AC_MSG_ERROR(assembler support for symbol visibility is required) fi rm -f conftest*]) if test $libc_cv_asm_protected_directive = yes; then AC_CACHE_CHECK(whether __attribute__((visibility())) is supported, libc_cv_visibility_attribute, [cat > conftest.c <&AS_MESSAGE_LOG_FD); then if grep '\.hidden.*foo' conftest.s >/dev/null; then if grep '\.protected.*bar' conftest.s >/dev/null; then libc_cv_visibility_attribute=yes fi fi fi rm -f conftest.{c,s} ]) if test $libc_cv_visibility_attribute != yes; then AC_MSG_ERROR(compiler support for visibility attribute is required) fi fi if test $libc_cv_visibility_attribute = yes; then AC_CACHE_CHECK(linker support for protected data symbol, libc_cv_protected_data, [cat > conftest.c < conftest.c < conftest.c <&AS_MESSAGE_LOG_FD); then changequote(,)dnl if grep '\.hidden[ _]foo' conftest.s >/dev/null; then changequote([,])dnl libc_cv_broken_visibility_attribute=no fi fi rm -f conftest.c conftest.s ]) if test $libc_cv_broken_visibility_attribute = yes; then AC_MSG_ERROR(working compiler support for visibility attribute is required) fi fi AC_CACHE_CHECK(for broken __attribute__((alias())), libc_cv_broken_alias_attribute, [cat > conftest.c <&AS_MESSAGE_LOG_FD); then if grep 'xyzzy' conftest.s >/dev/null && grep 'abccb' conftest.s >/dev/null; then libc_cv_broken_alias_attribute=no fi fi rm -f conftest.c conftest.s ]) if test $libc_cv_broken_alias_attribute = yes; then AC_MSG_ERROR(working alias attribute support required) fi if test $libc_cv_visibility_attribute = yes; then AC_CACHE_CHECK(whether to put _rtld_local into .sdata section, libc_cv_have_sdata_section, [echo "int i;" > conftest.c libc_cv_have_sdata_section=no if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \ | grep '\.sdata' >/dev/null; then libc_cv_have_sdata_section=yes fi rm -f conftest.c conftest.so ]) if test $libc_cv_have_sdata_section = yes; then AC_DEFINE(HAVE_SDATA_SECTION) fi fi AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support, libc_cv_initfini_array, [dnl LIBC_TRY_LINK_STATIC([ int foo (void) { return 1; } int (*fp) (void) __attribute__ ((section (".init_array"))) = foo; ], [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then libc_cv_initfini_array=yes else libc_cv_initfini_array=no fi], [libc_cv_initfini_array=no]) ]) if test $libc_cv_initfini_array != yes; then AC_MSG_ERROR([Need linker with .init_array/.fini_array support.]) fi AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer, libc_cv_ctors_header, [dnl libc_cv_ctors_header=yes LIBC_TRY_LINK_STATIC([ __attribute__ ((constructor)) void ctor (void) { asm (""); } __attribute__ ((destructor)) void dtor (void) { asm (""); } ], [dnl AS_IF([$READELF -WS conftest$ac_exeext | $AWK ' { gsub(/\@<:@ */, "@<:@") } $2 == ".ctors" || $2 == ".dtors" { size = strtonum("0x" $6) align = strtonum("0x" $NF) seen@<:@$2@:>@ = 1 stub@<:@$2@:>@ = size == align * 2 } END { ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@ dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@ exit ((ctors_ok && dtors_ok) ? 0 : 1) } '], [libc_cv_ctors_header=no]) ], [dnl AC_MSG_ERROR([missing __attribute__ ((constructor)) support??]) ]) ]) if test $libc_cv_ctors_header = no; then AC_DEFINE(NO_CTORS_DTORS_SECTIONS) fi AC_CACHE_CHECK(for libunwind-support in compiler, libc_cv_cc_with_libunwind, [ cat > conftest.c <&1 >/dev/null | grep ' -lunwind ' >/dev/null; then libc_cv_cc_with_libunwind=yes else libc_cv_cc_with_libunwind=no fi rm -f conftest*]) AC_SUBST(libc_cv_cc_with_libunwind) if test $libc_cv_cc_with_libunwind = yes; then AC_DEFINE(HAVE_CC_WITH_LIBUNWIND) fi LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete], [libc_cv_z_nodelete=yes], [AC_MSG_ERROR(linker with -z nodelete support required)]) LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen], [libc_cv_z_nodlopen=yes], [AC_MSG_ERROR(linker with -z nodlopen support required)]) LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst], [libc_cv_z_initfirst=yes], [AC_MSG_ERROR(linker with -z initfirst support required)]) AC_CACHE_CHECK(for -Bgroup option, libc_cv_Bgroup, [dnl cat > conftest.c <&AS_MESSAGE_LOG_FD]) then libc_cv_Bgroup=yes else libc_cv_Bgroup=no fi rm -f conftest*]) AC_SUBST(libc_cv_Bgroup) ASFLAGS_config= AC_CACHE_CHECK(whether --noexecstack is desirable for .S files, libc_cv_as_noexecstack, [dnl cat > conftest.c <&AS_MESSAGE_LOG_FD]) \ && grep .note.GNU-stack conftest.s >/dev/null \ && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD]) then libc_cv_as_noexecstack=yes else libc_cv_as_noexecstack=no fi rm -f conftest*]) if test $libc_cv_as_noexecstack = yes; then ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack" fi AC_SUBST(ASFLAGS_config) AC_CACHE_CHECK(for -z combreloc, libc_cv_z_combreloc, [dnl cat > conftest.c <&AS_MESSAGE_LOG_FD]) then dnl The following test is a bit weak. We must use a tool which can test dnl cross-platform since the gcc used can be a cross compiler. Without dnl introducing new options this is not easily doable. Instead use a tool dnl which always is cross-platform: readelf. To detect whether -z combreloc dnl look for a section named .rel.dyn. if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then libc_cv_z_combreloc=yes else libc_cv_z_combreloc=no fi else libc_cv_z_combreloc=no fi rm -f conftest*]) if test "$libc_cv_z_combreloc" = yes; then AC_DEFINE(HAVE_Z_COMBRELOC) fi AC_SUBST(libc_cv_z_combreloc) LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack], [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no]) AC_SUBST(libc_cv_z_execstack) AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no]) ]) AC_SUBST(libc_cv_fpie) AC_CACHE_CHECK(for --hash-style option, libc_cv_hashstyle, [dnl cat > conftest.c <&AS_MESSAGE_LOG_FD]) then libc_cv_hashstyle=yes else libc_cv_hashstyle=no fi rm -f conftest*]) AC_SUBST(libc_cv_hashstyle) # The linker's default -shared behavior is good enough if it # does these things that our custom linker scripts ensure that # all allocated NOTE sections come first. if test "$use_default_link" = default; then AC_CACHE_CHECK([for sufficient default -shared layout], libc_cv_use_default_link, [dnl libc_cv_use_default_link=no cat > conftest.s <<\EOF .section .note.a,"a",%note .balign 4 .long 4,4,9 .string "GNU" .string "foo" .section .note.b,"a",%note .balign 4 .long 4,4,9 .string "GNU" .string "bar" EOF if AC_TRY_COMMAND([dnl ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) && ac_try=`$READELF -S conftest.so | sed -n \ ['${x;p;} s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/ t a b : a H']` then libc_seen_a=no libc_seen_b=no set -- $ac_try while test $# -ge 2 -a "$1" = NOTE; do case "$2" in .note.a) libc_seen_a=yes ;; .note.b) libc_seen_b=yes ;; esac shift 2 done case "$libc_seen_a$libc_seen_b" in yesyes) libc_cv_use_default_link=yes ;; *) echo >&AS_MESSAGE_LOG_FD "\ $libc_seen_a$libc_seen_b from: $ac_try" ;; esac fi rm -f conftest*]) use_default_link=$libc_cv_use_default_link fi AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl if libc_cv_output_format=` ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD` then : else libc_cv_output_format= fi test -n "$libc_cv_output_format" || libc_cv_output_format=unknown]) AC_SUBST(libc_cv_output_format) AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl cat > conftest.c <&AS_MESSAGE_LOG_FD]) then libc_cv_fno_toplevel_reorder=yes else libc_cv_fno_toplevel_reorder=no fi rm -f conftest*]) if test $libc_cv_fno_toplevel_reorder = yes; then fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors" else fno_unit_at_a_time=-fno-unit-at-a-time fi AC_SUBST(fno_unit_at_a_time) AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector], [libc_cv_ssp=yes], [libc_cv_ssp=no]) ]) AC_SUBST(libc_cv_ssp) AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl cat > conftest.c <&AS_MESSAGE_LOG_FD]) then libc_cv_gnu89_inline=yes else libc_cv_gnu89_inline=no fi rm -f conftest*]) if test $libc_cv_gnu89_inline = yes; then gnu89_inline=-fgnu89-inline else gnu89_inline= fi AC_SUBST(gnu89_inline) AC_CACHE_CHECK(whether cc puts quotes around section names, libc_cv_have_section_quotes, [cat > conftest.c </dev/null; then libc_cv_have_section_quotes=yes else libc_cv_have_section_quotes=no fi else libc_cv_have_section_quotes=unknown fi rm -f conftest.{c,s} ]) if test $libc_cv_have_section_quotes = yes; then AC_DEFINE(HAVE_SECTION_QUOTES) fi AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive, [dnl cat > conftest.s <&AS_MESSAGE_LOG_FD); then libc_cv_asm_weak_directive=yes else libc_cv_asm_weak_directive=no fi rm -f conftest*]) if test $libc_cv_asm_weak_directive = no; then AC_CACHE_CHECK(for assembler .weakext directive, libc_cv_asm_weakext_directive, [dnl cat > conftest.s <&AS_MESSAGE_LOG_FD); then libc_cv_asm_weakext_directive=yes else libc_cv_asm_weakext_directive=no fi rm -f conftest*]) fi # no .weak if test $libc_cv_asm_weak_directive = yes; then AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE) elif test $libc_cv_asm_weakext_directive = yes; then AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE) fi AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl cat > conftest.c <<\EOF _start () {} int __eh_pc; __throw () {} EOF dnl No \ in command here because it ends up inside ''. if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles -Wl,--no-whole-archive -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then libc_cv_ld_no_whole_archive=yes else libc_cv_ld_no_whole_archive=no fi rm -f conftest*]) if test $libc_cv_ld_no_whole_archive = no; then AC_MSG_ERROR([support for --no-whole-archive is needed]) fi AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl cat > conftest.c <<\EOF void zero (void *x) { __builtin_memset (x, 0, 1000); } EOF dnl if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]); then libc_cv_gcc_builtin_memset=no else libc_cv_gcc_builtin_memset=yes fi rm -f conftest* ]) if test "$libc_cv_gcc_builtin_memset" = yes ; then AC_DEFINE(HAVE_BUILTIN_MEMSET) fi AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl cat > conftest.c <<\EOF extern char *strstr (const char *, const char *) __asm ("my_strstr"); char *foo (const char *a, const char *b) { return __builtin_strstr (a, b); } EOF dnl if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]); then libc_cv_gcc_builtin_redirection=yes else libc_cv_gcc_builtin_redirection=no fi rm -f conftest* ]) if test "$libc_cv_gcc_builtin_redirection" = no; then AC_MSG_ERROR([support for the symbol redirection needed]) fi dnl Check whether the compiler supports the __thread keyword. AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread, [cat > conftest.c <<\EOF __thread int a = 42; EOF if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then libc_cv_gcc___thread=yes else libc_cv_gcc___thread=no fi rm -f conftest*]) if test "$libc_cv_gcc___thread" = no; then AC_MSG_ERROR([support for the __thread keyword is required]) fi dnl Check whether the compiler supports the tls_model attribute. AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl cat > conftest.c <<\EOF extern __thread int a __attribute__((tls_model ("initial-exec"))); EOF if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then libc_cv_gcc_tls_model_attr=yes else libc_cv_gcc_tls_model_attr=no fi rm -f conftest*]) if test "$libc_cv_gcc_tls_model_attr" = no; then AC_MSG_ERROR([support for the tls_model attribute is required]) fi dnl Determine how to disable generation of FMA instructions. AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions], libc_cv_cc_nofma, [dnl libc_cv_cc_nofma= for opt in -ffp-contract=off -mno-fused-madd; do LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break]) done]) AC_SUBST(libc_cv_cc_nofma) if test -n "$submachine"; then AC_CACHE_CHECK([for compiler option for CPU variant], libc_cv_cc_submachine, [dnl libc_cv_cc_submachine=no for opt in "-march=$submachine" "-mcpu=$submachine"; do LIBC_TRY_CC_OPTION([$opt], [ libc_cv_cc_submachine="$opt" break], []) done]) if test "x$libc_cv_cc_submachine" = xno; then AC_MSG_ERROR([${CC-cc} does not support $submachine]) fi fi AC_SUBST(libc_cv_cc_submachine) AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \ __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl cat > conftest.c <], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no) CFLAGS="$old_CFLAGS" LDFLAGS="$old_LDFLAGS" LIBS="$old_LIBS" else LIBGD=no fi AC_MSG_RESULT($LIBGD) AC_SUBST(LIBGD) # SELinux detection if test x$with_selinux = xno ; then have_selinux=no; else # See if we have the SELinux library AC_CHECK_LIB(selinux, is_selinux_enabled, have_selinux=yes, have_selinux=no) if test x$with_selinux = xyes ; then if test x$have_selinux = xno ; then AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found]) fi fi fi # Check if we're building with SELinux support. if test "x$have_selinux" = xyes; then AC_DEFINE(HAVE_SELINUX, 1, [SELinux support]) # See if we have the libaudit library AC_CHECK_LIB(audit, audit_log_user_avc_message, have_libaudit=yes, have_libaudit=no) if test "x$have_libaudit" = xyes; then AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support]) fi AC_SUBST(have_libaudit) # See if we have the libcap library AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no) if test "x$have_libcap" = xyes; then AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support]) fi AC_SUBST(have_libcap) fi AC_SUBST(have_selinux) dnl check for the size of 'long double'. AC_CHECK_SIZEOF(long double, 0) sizeof_long_double=$ac_cv_sizeof_long_double AC_SUBST(sizeof_long_double) CPPUNDEFS= dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE. dnl Since we are building the implementations of the fortified functions here, dnl having the macro defined interacts very badly. AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source, [AC_TRY_COMPILE([], [ #ifdef _FORTIFY_SOURCE # error bogon #endif], [libc_cv_predef_fortify_source=no], [libc_cv_predef_fortify_source=yes])]) if test $libc_cv_predef_fortify_source = yes; then CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE" fi AC_SUBST(CPPUNDEFS) dnl Check for silly hacked compilers inserting -fstack-protector. dnl This breaks badly for the early startup code we compile, since dnl the compiled code can refer to a magic machine-dependent location dnl for the canary value before we have sufficient setup for that to dnl work. It's also questionable to build all of libc with this flag dnl even when you're doing that for most applications you build, since dnl libc's code is so heavily-used and performance-sensitive. If we dnl ever really want to make that work, it should be enabled explicitly dnl in the libc build, not inherited from implicit compiler settings. AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector], libc_cv_predef_stack_protector, [ AC_TRY_COMPILE([extern void foobar (char *);], [char large_array[2048]; foobar (large_array);], [ libc_undefs=`$NM -u conftest.o | LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \ 2>&AS_MESSAGE_LOG_FD` || { AC_MSG_ERROR([confusing output from $NM -u]) } echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'" # On some architectures, there are architecture-specific undefined # symbols (resolved by the linker), so filter out unknown symbols. # This will fail to produce the correct result if the compiler # defaults to -fstack-protector but this produces an undefined symbol # other than __stack_chk_fail. However, compilers like that have not # been encountered in practice. libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'` case "$libc_undefs" in foobar) libc_cv_predef_stack_protector=no ;; '__stack_chk_fail foobar') libc_cv_predef_stack_protector=yes ;; *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;; esac], [AC_MSG_ERROR([test compilation failed])]) ]) libc_extra_cflags= if test $libc_cv_predef_stack_protector = yes; then libc_extra_cflags="$libc_extra_cflags -fno-stack-protector" fi libc_extra_cppflags= # Some linkers on some architectures support __ehdr_start but with # bugs. Make sure usage of it does not create relocations in the # output (as the linker should resolve them all for us). AC_CACHE_CHECK([whether the linker provides working __ehdr_start], libc_cv_ehdr_start, [ old_CFLAGS="$CFLAGS" old_LDFLAGS="$LDFLAGS" old_LIBS="$LIBS" CFLAGS="$CFLAGS -fPIC" LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared" LIBS= AC_LINK_IFELSE([AC_LANG_SOURCE([ typedef struct { char foo; long val; } Ehdr; extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden"))); long ehdr (void) { return __ehdr_start.val; } ])], [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then libc_cv_ehdr_start=broken else libc_cv_ehdr_start=yes fi], [libc_cv_ehdr_start=no]) CFLAGS="$old_CFLAGS" LDFLAGS="$old_LDFLAGS" LIBS="$old_LIBS" ]) if test "$libc_cv_ehdr_start" = yes; then AC_DEFINE([HAVE_EHDR_START]) elif test "$libc_cv_ehdr_start" = broken; then AC_MSG_WARN([linker is broken -- you should upgrade]) fi AC_CACHE_CHECK(for __builtin_trap with no external dependencies, libc_cv_builtin_trap, [dnl libc_cv_builtin_trap=no AC_TRY_COMPILE([], [__builtin_trap ()], [ libc_undefs=`$NM -u conftest.o | LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \ 2>&AS_MESSAGE_LOG_FD` || { AC_MSG_ERROR([confusing output from $NM -u]) } echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'" if test -z "$libc_undefs"; then libc_cv_builtin_trap=yes fi])]) if test $libc_cv_builtin_trap = yes; then AC_DEFINE([HAVE_BUILTIN_TRAP]) fi dnl C++ feature tests. AC_LANG_PUSH([C++]) AC_CACHE_CHECK([whether the C++ compiler supports thread_local], libc_cv_cxx_thread_local, [ old_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -std=gnu++11" AC_COMPILE_IFELSE([AC_LANG_SOURCE([ #include // Compiler support. struct S { S (); ~S (); }; thread_local S s; S * get () { return &s; } // libstdc++ support. #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL #error __cxa_thread_atexit_impl not supported #endif ])], [libc_cv_cxx_thread_local=yes], [libc_cv_cxx_thread_local=no]) CXXFLAGS="$old_CXXFLAGS" ]) AC_SUBST(libc_cv_cxx_thread_local) AC_LANG_POP([C++]) dnl End of C++ feature tests. ### End of automated tests. ### Now run sysdeps configure fragments. # They also can set these variables. use_ldconfig=no ldd_rewrite_script=no libc_cv_sysconfdir=$sysconfdir libc_cv_localstatedir=$localstatedir libc_cv_gcc_unwind_find_fde=no libc_cv_idn=no # Iterate over all the sysdep directories we will use, running their # configure fragments. for dir in $sysnames; do case $dir in /*) dest=$dir ;; *) dest=$srcdir/$dir ;; esac if test -r $dest/configure; then AC_MSG_RESULT(running configure fragment for $dir) . $dest/configure fi done if test x"$build_mathvec" = xnotset; then build_mathvec=no fi LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec]) AC_SUBST(libc_extra_cflags) AC_SUBST(libc_extra_cppflags) if test x$libc_cv_gcc_unwind_find_fde = xyes; then AC_DEFINE(EXPORT_UNWIND_FIND_FDE) fi AC_SUBST(libc_cv_gcc_unwind_find_fde) # A sysdeps configure fragment can reset this if IFUNC is not actually # usable even though the assembler knows how to generate the symbol type. if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then AC_DEFINE(HAVE_IFUNC) fi # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps # configure fragment can override the value to prevent this AC_DEFINE. AC_SUBST(use_nscd) if test "x$use_nscd" != xno; then AC_DEFINE([USE_NSCD]) fi if test "x$build_nscd" = xdefault; then build_nscd=$use_nscd fi # Test for old glibc 2.0.x headers so that they can be removed properly # Search only in includedir. AC_MSG_CHECKING(for old glibc 2.0.x headers) if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h" then old_glibc_headers=yes else old_glibc_headers=no fi AC_MSG_RESULT($old_glibc_headers) if test ${old_glibc_headers} = yes; then AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will) AC_MSG_WARN(*** be removed.) fi AC_SUBST(old_glibc_headers) AC_SUBST(libc_cv_slibdir) AC_SUBST(libc_cv_rtlddir) AC_SUBST(libc_cv_localedir) AC_SUBST(libc_cv_sysconfdir) AC_SUBST(libc_cv_localstatedir) AC_SUBST(libc_cv_rootsbindir) AC_SUBST(libc_cv_forced_unwind) if test x$use_ldconfig = xyes; then AC_DEFINE(USE_LDCONFIG) fi AC_SUBST(use_ldconfig) AC_SUBST(ldd_rewrite_script) AC_SUBST(static) AC_SUBST(shared) AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default, [libc_cv_pic_default=yes cat > conftest.c <&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then libc_cv_pic_default=no fi rm -f conftest.*]) AC_SUBST(libc_cv_pic_default) AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default, [libc_cv_pie_default=yes cat > conftest.c <&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then libc_cv_pie_default=no fi rm -f conftest.*]) AC_SUBST(libc_cv_pie_default) AC_SUBST(profile) AC_SUBST(static_nss) AC_SUBST(DEFINES) dnl See sysdeps/mach/configure.ac for this variable. AC_SUBST(mach_interface_list) VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h` RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h` AC_SUBST(VERSION) AC_SUBST(RELEASE) AC_CONFIG_FILES([config.make Makefile]) AC_CONFIG_COMMANDS([default],[[ case $CONFIG_FILES in *config.make*) echo "$config_vars" >> config.make;; esac test -d bits || mkdir bits]],[[config_vars='$config_vars']]) AC_OUTPUT