diff options
Diffstat (limited to 'libc/configure.in')
| -rw-r--r-- | libc/configure.in | 183 |
1 files changed, 137 insertions, 46 deletions
diff --git a/libc/configure.in b/libc/configure.in index 8ba667140..987010d0c 100644 --- a/libc/configure.in +++ b/libc/configure.in @@ -5,6 +5,11 @@ AC_CONFIG_SRCDIR([include/features.h]) AC_CONFIG_HEADERS([config.h]) AC_CONFIG_AUX_DIR([scripts]) +# Glibc should not depend on any header files +AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS], + [m4_divert_text([DEFAULTS], + [ac_includes_default='/* none */'])]) + dnl This is here so we can set $subdirs directly based on configure fragments. AC_CONFIG_SUBDIRS() @@ -257,6 +262,7 @@ else fi AC_SUBST(libc_cv_nss_crypt) + AC_ARG_ENABLE([obsolete-rpc], AC_HELP_STRING([--enable-obsolete-rpc], [build and install the obsolete RPC code for link-time usage]), @@ -268,6 +274,29 @@ if test "$link_obsolete_rpc" = yes; then AC_DEFINE(LINK_OBSOLETE_RPC) fi +AC_ARG_ENABLE([systemtap], + [AS_HELP_STRING([--enable-systemtap], + [enable systemtap static probe points @<:@default=no@:>@])], + [systemtap=$enableval], + [systemtap=no]) +if test "x$systemtap" != xno; then + AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl + old_CFLAGS="$CFLAGS" + CFLAGS="-std=gnu99 $CFLAGS" + AC_COMPILE_IFELSE([#include <sys/sdt.h> +void foo (int i, void *p) +{ + asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) "" + :: STAP_PROBE_ASM_OPERANDS (2, i, p)); +}], [libc_cv_sdt=yes], [libc_cv_sdt=no]) + CFLAGS="$old_CFLAGS"]) + if test $libc_cv_sdt = yes; then + AC_DEFINE([USE_STAP_PROBE]) + elif test "x$systemtap" != xauto; then + AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support]) + fi +fi + # The way shlib-versions is used to generate soversions.mk uses a # fairly simplistic model for name recognition that can't distinguish # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os @@ -771,59 +800,60 @@ while test $# -gt 0; do test -n "$enable_debug_configure" && echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2 - if test -f $xsrcdir$name/Implies; then - # Collect more names from the `Implies' file (removing comments). - implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/Implies`" - implied= - for x in $implied_candidate; do - found=no - if test -d $xsrcdir$name_base/$x; then - # If !OPTION_EGLIBC_LIBM_BIG, add ieee754/dbl-wrap just before - # ieee754/dbl-64. - if test "$use_dbl_wrap" = "0"; then - case $x in - ieee754/dbl-64) implied="$implied $name_base/ieee754/dbl-wrap" ;; - ieee754/ldbl-*) implied="$implied $name_base/ieee754/ldbl-wrap" ;; - esac - fi - implied="$implied $name_base/$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 implied $x try($d) {$try_srcdir}$try" >&2 - if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try; - then + 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/$x; then # If !OPTION_EGLIBC_LIBM_BIG, add ieee754/dbl-wrap just before # ieee754/dbl-64. if test "$use_dbl_wrap" = "0"; then - case $try in - sysdeps/ieee754/dbl-64) - implied="$implied sysdeps/ieee754/dbl-wrap" ;; - sysdeps/ieee754/ldbl-*) - implied="$implied sysdeps/ieee754/ldbl-wrap" ;; + case $x in + ieee754/dbl-64) eval "${implies_type}=\"\$${implies_type} \$name_base/ieee754/dbl-wrap\"" ;; + ieee754/ldbl-*) eval "${implies_type}=\"\$${implies_type} \$name_base/ieee754/ldbl-wrap\"" ;; esac fi - implied="$implied $try" + eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\"" found=yes - case "$sysnames_add_ons" in - *" $d "*) ;; - *|'') sysnames_add_ons="$sysnames_add_ons $d" ;; + 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 + # If !OPTION_EGLIBC_LIBM_BIG, add ieee754/dbl-wrap just before + # ieee754/dbl-64. + if test "$use_dbl_wrap" = "0"; then + case $try in + sysdeps/ieee754/dbl-64) + eval "${implies_type}=\"\$${implies_type} sysdeps/ieee754/dbl-wrap\"" ;; + sysdeps/ieee754/ldbl-*) + eval "${implies_type}=\"\$${implies_type} sysdeps/ieee754/ldbl-wrap\"" ;; + esac + fi + 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 - if test $found = no; then - AC_MSG_WARN($name/Implies specifies nonexistent $x) - fi - done - else - implied= - fi + fi + done # Add NAME to the list of names. names="$names $name" @@ -833,6 +863,10 @@ 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='$Implies_after' Implies_after='$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 @@ -840,7 +874,7 @@ changequote([,])dnl # 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 $implied $* $parent`" + sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`" test -n "$sysnames" && set $sysnames done @@ -942,7 +976,7 @@ AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version, MSGFMT=: aux_missing="$aux_missing msgfmt") AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version, [GNU texinfo.* \([0-9][0-9.]*\)], - [4.*], + [4.[5-9]*|4.[1-9][0-9]*|[5-9].*], MAKEINFO=: aux_missing="$aux_missing makeinfo") AC_CHECK_PROG_VER(SED, sed, --version, [GNU sed version \([0-9]*\.[0-9.]*\)], @@ -950,6 +984,7 @@ AC_CHECK_PROG_VER(SED, sed, --version, SED=: aux_missing="$aux_missing sed") AC_CHECK_TOOL(READELF, readelf, false) +AC_CHECK_TOOL(NM, nm, false) AC_CHECK_PROGS(AUTOCONF, autoconf, no) case "x$AUTOCONF" in @@ -2055,6 +2090,62 @@ 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=-fno-stack-protector +fi +AC_SUBST(libc_extra_cflags) + ### End of automated tests. ### Now run sysdeps configure fragments. |