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Try to link a simple shared object with -Wl,--no-undefined.
This only works for gcc-style compilers, which should not be a problem. The source uses environ (FreeBSD) and errno (OpenBSD).
This commit is contained in:
Todd C. Miller
parent
0010c98613
commit
f65a51afdf
61
configure
vendored
61
configure
vendored
@ -19828,54 +19828,51 @@ fi
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# but is incompatible with the sanitizers/fuzzers.
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# We must set this *before* the library tests.
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#
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if test X"${enable_sanitizer}{enable_fuzzer}" = X"nono"; then
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case "$host_os" in
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freebsd*|dragonfly*|openbsd*)
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# On FreeBSD and Dragonfly, environ is filled in by the
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# dynamic loader so we cannot use -Wl,--no-undefined.
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if test -n "$GCC" -a X"${enable_sanitizer}${enable_fuzzer}" = X"nono"; then
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# On FreeBSD and Dragonfly, environ is filled in by the dynamic loader
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# so -Wl,--no-undefined causes a link error when environ is used.
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# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263265
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# OpenBSD shared libraries don't link explicitly with libc
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# which results in undefined references errors.
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# Ideally we would link a shared object with -Wl,--no-undefined
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# and see if it works but this is not easy in a libtool world.
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;;
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*)
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the linker accepts -Wl,--no-undefined" >&5
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printf %s "checking whether the linker accepts -Wl,--no-undefined... " >&6; }
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if test ${ax_cv_check_ldflags___Wl___no_undefined+y}
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# We use errno because OpenBSD shared libraries don't explicitly
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# link with libc, which can result in undefined reference errors.
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking the linker accepts -Wl,--no-undefined" >&5
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printf %s "checking the linker accepts -Wl,--no-undefined... " >&6; }
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if test ${sudo_cv_var_ld___no_undefined+y}
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then :
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printf %s "(cached) " >&6
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else case e in #(
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e)
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ax_check_save_flags=$LDFLAGS
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LDFLAGS="$LDFLAGS -Wl,--no-undefined"
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sudo_cv_var_ld___no_undefined=no
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_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $lt_prog_compiler_pic"
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_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS $lt_prog_compiler_pic -shared -Wl,--no-undefined"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#include <errno.h>
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extern char **environ;
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int
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main (void)
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{
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int ret = ((long)environ & 0xff) + errno; return ret;
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_link "$LINENO"
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then :
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ax_cv_check_ldflags___Wl___no_undefined=yes
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else case e in #(
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e) ax_cv_check_ldflags___Wl___no_undefined=no ;;
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esac
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sudo_cv_var_ld___no_undefined=yes
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.beam \
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conftest$ac_exeext conftest.$ac_ext
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LDFLAGS=$ax_check_save_flags ;;
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CFLAGS="$_CFLAGS"
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LDFLAGS="$_LDFLAGS"
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;;
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esac
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_ldflags___Wl___no_undefined" >&5
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printf "%s\n" "$ax_cv_check_ldflags___Wl___no_undefined" >&6; }
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if test x"$ax_cv_check_ldflags___Wl___no_undefined" = xyes
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then :
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $sudo_cv_var_ld___no_undefined" >&5
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printf "%s\n" "$sudo_cv_var_ld___no_undefined" >&6; }
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if test "$sudo_cv_var_ld___no_undefined" = "yes"; then
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if test ${LDFLAGS+y}
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then :
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@ -19910,13 +19907,7 @@ else case e in #(
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esac
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fi
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else case e in #(
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e) : ;;
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esac
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fi
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;;
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esac
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fi
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fi
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#
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@ -32523,7 +32514,7 @@ else case e in #(
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_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $lt_prog_compiler_pic"
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_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -fpic -shared -Wl,--version-script,./conftest.map"
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LDFLAGS="$LDFLAGS $lt_prog_compiler_pic -shared -Wl,--version-script,./conftest.map"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int foo;
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43
configure.ac
43
configure.ac
@ -2455,21 +2455,30 @@ AC_SYS_YEAR2038
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# but is incompatible with the sanitizers/fuzzers.
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# We must set this *before* the library tests.
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#
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if test X"${enable_sanitizer}{enable_fuzzer}" = X"nono"; then
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case "$host_os" in
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freebsd*|dragonfly*|openbsd*)
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# On FreeBSD and Dragonfly, environ is filled in by the
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# dynamic loader so we cannot use -Wl,--no-undefined.
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if test -n "$GCC" -a X"${enable_sanitizer}${enable_fuzzer}" = X"nono"; then
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# On FreeBSD and Dragonfly, environ is filled in by the dynamic loader
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# so -Wl,--no-undefined causes a link error when environ is used.
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# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263265
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# OpenBSD shared libraries don't link explicitly with libc
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# which results in undefined references errors.
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# Ideally we would link a shared object with -Wl,--no-undefined
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# and see if it works but this is not easy in a libtool world.
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;;
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*)
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AX_CHECK_LINK_FLAG([-Wl,--no-undefined], [AX_APPEND_FLAG([-Wl,--no-undefined], [LDFLAGS])])
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;;
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esac
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# We use errno because OpenBSD shared libraries don't explicitly
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# link with libc, which can result in undefined reference errors.
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AC_CACHE_CHECK([the linker accepts -Wl,--no-undefined],
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[sudo_cv_var_ld___no_undefined],
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[
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sudo_cv_var_ld___no_undefined=no
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_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $lt_prog_compiler_pic"
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_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS $lt_prog_compiler_pic -shared -Wl,--no-undefined"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <errno.h>
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extern char **environ;]], [[int ret = ((long)environ & 0xff) + errno; return ret;]])],
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[sudo_cv_var_ld___no_undefined=yes])
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CFLAGS="$_CFLAGS"
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LDFLAGS="$_LDFLAGS"
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]
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)
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if test "$sudo_cv_var_ld___no_undefined" = "yes"; then
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AX_APPEND_FLAG([-Wl,--no-undefined], [LDFLAGS])
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fi
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fi
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#
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@ -2482,12 +2491,12 @@ case "$host_os" in
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hpux*)
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AC_CACHE_CHECK([whether sys/socket.h needs _XOPEN_SOURCE_EXTENDED for MSG_WAITALL], [sudo_cv_xopen_source_extended],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
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# include <sys/socket.h>], [int a = MSG_WAITALL; return a;])],
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[# include <sys/socket.h>]], [[int a = MSG_WAITALL; return a;]])],
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[sudo_cv_xopen_source_extended=no], [
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#define _XOPEN_SOURCE_EXTENDED
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AC_INCLUDES_DEFAULT
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# include <sys/socket.h>
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# include <net/if.h>], [int a = MSG_WAITALL; return a;])],
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[# include <sys/socket.h>
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# include <net/if.h>]], [[int a = MSG_WAITALL; return a;]])],
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[sudo_cv_xopen_source_extended=yes],
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[sudo_cv_xopen_source_extended=error])
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])])
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@ -71,7 +71,7 @@ AC_DEFUN([SUDO_SYMBOL_VISIBILITY], [
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_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $lt_prog_compiler_pic"
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_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -fpic -shared -Wl,--version-script,./conftest.map"
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LDFLAGS="$LDFLAGS $lt_prog_compiler_pic -shared -Wl,--version-script,./conftest.map"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foo;]], [[]])],
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[sudo_cv_var_gnu_ld_anon_map=yes])
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CFLAGS="$_CFLAGS"
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