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57 lines
1.8 KiB
57 lines
1.8 KiB
From b6d16129a525f572ef37d20ba1cd70d59ca4f079 Mon Sep 17 00:00:00 2001
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From: Stefan Berger <stefanb@linux.vnet.ibm.com>
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Date: Tue, 21 Jul 2020 17:38:10 -0400
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Subject: [PATCH 1/2] build-sys: Use AC_COMPILE_IFELSE to check for unused
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linker flags (clang)
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This patch fixes a clang issue report in issue #280.
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clang does not use ld, so we cannot grep for support of certain linker
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flags but have to test-compile.
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Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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---
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configure.ac | 26 +++++++++++++++++++-------
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1 file changed, 19 insertions(+), 7 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index b4d4258..56d3f09 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -357,13 +357,25 @@ if test "x$enable_hardening" != "xno"; then
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if test -z "$TMP1" && test -n "$TPM2"; then
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HARDENING_CFLAGS="$HARDENING_CFLAGS -D_FORTIFY_SOURCE=2 "
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fi
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- dnl Check ld for 'relro' and 'now'
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- if $LD --help 2>&1 | $GREP '\-z relro ' > /dev/null; then
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- HARDENING_CFLAGS="$HARDENING_CFLAGS -Wl,-z,relro "
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- fi
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- if $LD --help 2>&1 | $GREP '\-z now ' > /dev/null; then
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- HARDENING_CFLAGS="$HARDENING_CFLAGS -Wl,-z,now "
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- fi
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+ dnl Check linker for 'relro' and 'now'
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+ save_CFLAGS="$CFLAGS"
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+ CFLAGS="-Wl,-z,relro -Werror"
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+ AC_MSG_CHECKING([whether linker supports -Wl,-z,relro])
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+ AC_COMPILE_IFELSE(
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+ [AC_LANG_SOURCE([[int main() { return 0; }]])],
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+ [HARDENING_CFLAGS="$HARDENING_CFLAGS -Wl,-z,relro"
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+ AC_MSG_RESULT(yes)],
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+ [AC_MSG_RESULT(no)]
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+ )
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+ CFLAGS="-Wl,-z,now -Werror"
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+ AC_MSG_CHECKING([whether linker supports -Wl,-z,now])
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+ AC_COMPILE_IFELSE(
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+ [AC_LANG_SOURCE([[int main() { return 0; }]])],
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+ [HARDENING_CFLAGS="$HARDENING_CFLAGS -Wl,-z,now"
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+ AC_MSG_RESULT(yes)],
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+ [AC_MSG_RESULT(no)]
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+ )
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+ CFLAGS="$save_CFLAGS"
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AC_SUBST([HARDENING_CFLAGS])
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fi
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--
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2.26.2
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