+dnl
+dnl Turn warnings into errors.
+dnl All compiler/loader tests after this point will fail if
+dnl a warning is displayed (nornally, warnings are not fata).
+dnl
+AC_LANG_WERROR
+
+dnl
+dnl If compiler supports the -static-libgcc flag use it unless we have
+dnl GNU ld (which can avoid linking in libgcc when it is not needed).
+dnl This test relies on AC_LANG_WERROR
+dnl
+if test -n "$GCC" -a "$lt_cv_prog_gnu_ld" != "yes" -a -n "$GCC"; then
+ AX_CHECK_COMPILE_FLAG([-static-libgcc], [LT_LDFLAGS="$LT_LDFLAGS -Wc,-static-libgcc"])
+fi
+
+dnl
+dnl Check for symbol visibility support.
+dnl This test relies on AC_LANG_WERROR
+dnl
+if test -n "$GCC"; then
+ AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [
+ AC_DEFINE(HAVE_DSO_VISIBILITY)
+ CFLAGS="${CFLAGS} -fvisibility=hidden"
+ LT_LDEXPORTS=
+ LT_LDDEP=
+ NO_VIZ=
+ ])
+else
+ case "$host_os" in
+ hpux*)
+ AX_CHECK_COMPILE_FLAG([-Bhidden_def], [
+ AC_DEFINE(HAVE_DSO_VISIBILITY)
+ CFLAGS="${CFLAGS} -Bhidden_def"
+ LT_LDEXPORTS=
+ LT_LDDEP=
+ ])
+ ;;
+ solaris2*)
+ AX_CHECK_COMPILE_FLAG([-xldscope=hidden], [
+ AC_DEFINE(HAVE_DSO_VISIBILITY)
+ CFLAGS="${CFLAGS} -xldscope=hidden"
+ LT_LDEXPORTS=
+ LT_LDDEP=
+ ])
+ ;;
+ esac
+fi
+
+dnl
+dnl If the compiler doesn't have symbol visibility support, it may
+dnl support version scripts (only GNU and Solaris ld).
+dnl This test relies on AC_LANG_WERROR
+dnl
+if test -n "$LT_LDEXPORTS"; then
+ if test "$lt_cv_prog_gnu_ld" = "yes"; then
+ AC_CACHE_CHECK([whether ld supports anonymous map files],
+ [sudo_cv_var_gnu_ld_anon_map],
+ [
+ sudo_cv_var_gnu_ld_anon_map=no
+ cat > conftest.map <<-EOF
+ {
+ global: foo;
+ local: *;
+ };
+EOF
+ _CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $lt_prog_compiler_pic"
+ _LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS -fpic -shared -Wl,--version-script,./conftest.map"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foo;]], [[]])],
+ [sudo_cv_var_gnu_ld_anon_map=yes])
+ CFLAGS="$_CFLAGS"
+ LDFLAGS="$_LDFLAGS"
+ ]
+ )
+ if test "$sudo_cv_var_gnu_ld_anon_map" = "yes"; then
+ LT_LDEXPORTS=; LT_LDDEP="\$(shlib_map)"; LT_LDMAP="-Wl,--version-script,\$(shlib_map)"
+ fi
+ else
+ case "$host_os" in
+ solaris2*)
+ AC_CACHE_CHECK([whether ld supports anonymous map files],
+ [sudo_cv_var_solaris_ld_anon_map],
+ [
+ sudo_cv_var_solaris_ld_anon_map=no
+ cat > conftest.map <<-EOF
+ {
+ global: foo;
+ local: *;
+ };
+EOF
+ _CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $lt_prog_compiler_pic"
+ _LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS -shared -Wl,-M,./conftest.map"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foo;]], [[]])],
+ [sudo_cv_var_solaris_ld_anon_map=yes])
+ CFLAGS="$_CFLAGS"
+ LDFLAGS="$_LDFLAGS"
+ ]
+ )
+ if test "$sudo_cv_var_solaris_ld_anon_map" = "yes"; then
+ LT_LDEXPORTS=; LT_LDDEP="\$(shlib_map)"; LT_LDMAP="-Wl,-M,\$(shlib_map)"
+ fi
+ ;;
+ hpux*)
+ AC_CACHE_CHECK([whether ld supports controlling exported symbols],
+ [sudo_cv_var_hpux_ld_symbol_export],
+ [
+ sudo_cv_var_hpux_ld_symbol_export=no
+ echo "+e foo" > conftest.opt
+ _CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $lt_prog_compiler_pic"
+ _LDFLAGS="$LDFLAGS"
+ if test -n "$GCC"; then
+ LDFLAGS="$LDFLAGS -shared -Wl,-c,./conftest.opt"
+ else
+ LDFLAGS="$LDFLAGS -Wl,-b -Wl,-c,./conftest.opt"
+ fi
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foo;]], [[]])],
+ [sudo_cv_var_hpux_ld_symbol_export=yes])
+ CFLAGS="$_CFLAGS"
+ LDFLAGS="$_LDFLAGS"
+ rm -f conftest.opt
+ ]
+ )
+ if test "$sudo_cv_var_hpux_ld_symbol_export" = "yes"; then
+ LT_LDEXPORTS=; LT_LDDEP="\$(shlib_opt)"; LT_LDOPT="-Wl,-c,\$(shlib_opt)"
+ fi
+ ;;
+ esac
+ fi
+fi
+
+dnl
+dnl Check for PIE executable support if using gcc.
+dnl This test relies on AC_LANG_WERROR
+dnl
+if test -n "$GCC"; then
+ if test -z "$enable_pie"; then
+ case "$host_os" in
+ linux*)
+ # Attempt to build with PIE support
+ enable_pie="maybe"
+ ;;
+ esac
+ fi
+ if test -n "$enable_pie"; then
+ if test "$enable_pie" = "no"; then
+ AX_CHECK_COMPILE_FLAG([-fno-pie], [
+ _CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -fno-pie"
+ AX_CHECK_LINK_FLAG([-nopie], [
+ PIE_CFLAGS="-fno-pie"
+ PIE_LDFLAGS="-nopie"
+ ])
+ CFLAGS="$_CFLAGS"
+ ])
+ else
+ AX_CHECK_COMPILE_FLAG([-fPIE], [
+ _CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -fPIE"
+ AX_CHECK_LINK_FLAG([-pie], [
+ if test "$enable_pie" = "maybe"; then
+ SUDO_WORKING_PIE([enable_pie=yes], [])
+ fi
+ if test "$enable_pie" = "yes"; then
+ PIE_CFLAGS="-fPIE"
+ PIE_LDFLAGS="-Wc,-fPIE -pie"
+ fi
+ ])
+ CFLAGS="$_CFLAGS"
+ ])
+ fi
+ fi
+fi
+if test "$enable_pie" != "yes"; then
+ # Solaris 11.1 and higher supports tagging binaries to use ASLR
+ case "$host_os" in
+ solaris2.1[[1-9]]|solaris2.[[2-9]][[0-9]])
+ AX_CHECK_LINK_FLAG([-Wl,-z,aslr], [PIE_LDFLAGS="${PIE_LDFLAGS}${PIE_LDFLAGS+ }-Wl,-z,aslr"])
+ ;;
+ esac
+fi
+
+dnl
+dnl Check for -fstack-protector and -z relro support
+dnl This test relies on AC_LANG_WERROR
+dnl
+if test "$enable_hardening" != "no"; then
+ if test -n "$GCC"; then
+ AX_CHECK_COMPILE_FLAG([-fstack-protector-all], [
+ AX_CHECK_LINK_FLAG([-fstack-protector-all], [
+ SSP_CFLAGS="-fstack-protector-all"
+ SSP_LDFLAGS="-Wc,-fstack-protector-all"
+ ])
+ ])
+ if test -z "$SSP_CFLAGS"; then
+ AX_CHECK_COMPILE_FLAG([-fstack-protector], [
+ AX_CHECK_LINK_FLAG([-fstack-protector], [
+ SSP_CFLAGS="-fstack-protector"
+ SSP_LDFLAGS="-Wc,-fstack-protector"
+ ])
+ ])
+ fi
+ fi
+ AX_CHECK_LINK_FLAG([-Wl,-z,relro], [LDFLAGS="${LDFLAGS} -Wl,-z,relro"])
+fi
+
projects / debian / sudo / blobdiff