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build-sys: Use AC_LINK_IFELSE to check for understood linker flags

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Use AC_LINK_IFELSE to check whether linker flags like 'now' and
'relro' are understood or remain unused (= useless), and only add them
to the set of HARDENING_LDFLAGS, if they are used by the linker. clang
for example does not seem to use them and Cygwin's linker does not
understand them.

Note: This patch merely improves on the handling of these flags but does
not solve a compilation issue when clang is used, unlike swtpm where
this created issues.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Stefan Berger 2020-07-22 00:08:12 -04:00 committed by Stefan Berger
parent c3e6bb971d
commit d41dedca4d
1 changed files with 19 additions and 7 deletions
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26
configure.ac
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@ -276,13 +276,25 @@ if test "x$enable_hardening" != "xno"; then
if test -z "$TMP1" && test -n "$TPM2"; then
HARDENING_CFLAGS="$HARDENING_CFLAGS -D_FORTIFY_SOURCE=2 "
fi
dnl Check ld for 'relro' and 'now'
if $LD --help 2>&1 | $GREP '\-z relro ' > /dev/null; then
HARDENING_LDFLAGS="$HARDENING_LDFLAGS -Wl,-z,relro "
fi
if $LD --help 2>&1 | $GREP '\-z now ' > /dev/null; then
HARDENING_LDFLAGS="$HARDENING_LDFLAGS -Wl,-z,now "
fi
dnl Check linker for 'relro' and 'now'
save_CFLAGS="$CFLAGS"
CFLAGS="-Wl,-z,relro -Werror"
AC_MSG_CHECKING([whether linker supports -Wl,-z,relro])
AC_LINK_IFELSE(
[AC_LANG_SOURCE([[int main() { return 0; }]])],
[HARDENING_LDFLAGS="$HARDENING_LDFLAGS -Wl,-z,relro"
AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)]
)
CFLAGS="-Wl,-z,now -Werror"
AC_MSG_CHECKING([whether linker supports -Wl,-z,now])
AC_LINK_IFELSE(
[AC_LANG_SOURCE([[int main() { return 0; }]])],
[HARDENING_LDFLAGS="$HARDENING_LDFLAGS -Wl,-z,now"
AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)]
)
CFLAGS="$save_CFLAGS"
AC_SUBST([HARDENING_CFLAGS])
AC_SUBST([HARDENING_LDFLAGS])
fi