diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 80 |
1 files changed, 63 insertions, 17 deletions
diff --git a/configure.in b/configure.in index 95450ba110..e9464d89e6 100644 --- a/configure.in +++ b/configure.in @@ -1561,26 +1561,72 @@ EOF fi rm -f conftest*]) + # Add-on fragments can set these for other machines. + libc_commonpagesize=${libc_commonpagesize:-no} + libc_relro_required=${libc_relro_required:-no} case "$base_machine" in -changequote(,)dnl - i[34567]86 | x86_64 | powerpc* | s390* | sparc* | alpha*) -changequote([,])dnl - AC_CACHE_CHECK(for -z relro option, - libc_cv_z_relro, [dnl - libc_cv_z_relro=no - if AC_TRY_COMMAND([${CC-cc} -v --help 2>&1|grep "z relro" 1>&AS_MESSAGE_LOG_FD]) - then - if AC_TRY_COMMAND([${CC-cc} -Wl,--verbose 2>&1|grep DATA_SEGMENT_RELRO_END 1>&AS_MESSAGE_LOG_FD]) + i[[34567]]86 | x86_64 | powerpc* | s390*) + libc_commonpagesize=0x1000 + libc_relro_required=yes + ;; + sparc*) + libc_commonpagesize=0x2000 + libc_relro_required=yes + ;; + ia64*) + libc_commonpagesize=0x4000 + ;; + alpha*) + libc_commonpagesize=0x10000 + libc_relro_required=yes + ;; + esac + + if test $libc_commonpagesize != no; then + AC_CACHE_CHECK(for -z relro option, + libc_cv_z_relro, [dnl + libc_cv_z_relro=no + AC_LANG_CONFTEST([AC_LANG_SOURCE([[ +int _start (void) { return 42; } +extern void _exit (int); +const void *relro[] = { &_start, &_exit, 0 }; +]])]) + cat > conftest.awk <<\EOF +BEGIN { + result = "no" + commonpagesize = strtonum(commonpagesize) +} +{ print "LINE:", $0 > "/dev/stderr" } +$1 == "GNU_RELRO" { + vaddr = strtonum($3) + memsz = strtonum($6) + end = vaddr + memsz + printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \ + vaddr, memsz, end, commonpagesize > "/dev/stderr" + result = (end % commonpagesize == 0) ? "yes" : "broken" +} +END { print result } +EOF + AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS + -fPIC -shared -o conftest.so conftest.c + -nostartfiles -nostdlib + -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) && + AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) && + AC_TRY_COMMAND([ + $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk + conftest.ph > conftest.cps + ]) && + libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD` + rm -f conftest*]) + if { test "x$libc_relro_required" = xyes && + test "x$libc_cv_z_relro" != xyes + } then - libc_cv_z_relro=yes + AC_MSG_ERROR(linker with -z relro support required) fi - fi]) - if test "$libc_cv_z_relro" = no; then - AC_MSG_ERROR(linker with -z relro support required) - fi - ;; - *) ;; - esac + else + AC_MSG_WARN([missing architecture parameter to check for working -z relro]) + fi AC_CACHE_CHECK(for -Bgroup option, libc_cv_Bgroup, [dnl |