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Fix -nopie/-nopie check.

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We don't use lgcc_s but missing lgcc_s or another library cause test to fail.
So use -nostdlib.
We need to use -Werror to avoid warning-generated case to be accepted.
Clang uses -nopie rather than -no-pie. Check both and use whichever one works.
Additionally android clang passes -pie to the linker even though it doesn't
define __PIE__. So if compilation without no-pie logic fails add -nopie/-no-pie
even if __PIE__ is not defined.
This commit is contained in:
Vladimir Serbinenko 2017-01-30 14:38:50 +01:00
parent 6371e9c104
commit b53f595b3e
2 changed files with 45 additions and 3 deletions
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36
acinclude.m4
View file

@ -390,12 +390,29 @@ else
[fi]
])
AC_DEFUN([grub_CHECK_LINK_PIE],[
[# Position independent executable.
link_nopie_needed=no]
AC_MSG_CHECKING([whether linker needs disabling of PIE to work])
AC_LANG_CONFTEST([AC_LANG_SOURCE([[]])])
[if eval "$ac_compile -Wl,-r,-d -nostdlib -Werror -o conftest.o" 2> /dev/null; then]
AC_MSG_RESULT([no])
[# Should we clear up other files as well, having called `AC_LANG_CONFTEST'?
rm -f conftest.o
else
link_nopie_needed=yes]
AC_MSG_RESULT([yes])
[fi]
])
dnl Check if the Linker supports `-no-pie'.
AC_DEFUN([grub_CHECK_NO_PIE],
[AC_MSG_CHECKING([whether linker accepts -no-pie])
AC_CACHE_VAL(grub_cv_cc_ld_no_pie,
[save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -no-pie"
LDFLAGS="$LDFLAGS -no-pie -nostdlib -Werror"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_cc_ld_no_pie=yes],
[grub_cv_cc_ld_no_pie=no])
@ -408,6 +425,23 @@ if test "x$grub_cv_cc_ld_no_pie" = xyes ; then
fi
])
AC_DEFUN([grub_CHECK_NO_PIE_ONEWORD],
[AC_MSG_CHECKING([whether linker accepts -nopie])
AC_CACHE_VAL(grub_cv_cc_ld_no_pie_oneword,
[save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -nopie -nostdlib -Werror"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_cc_ld_no_pie_oneword=yes],
[grub_cv_cc_ld_no_pie_oneword=no])
LDFLAGS="$save_LDFLAGS"
])
AC_MSG_RESULT([$grub_cv_cc_ld_no_pie_oneword])
nopie_oneword_possible=no
if test "x$grub_cv_cc_ld_no_pie_oneword" = xyes ; then
nopie_oneword_possible=yes
fi
])
dnl Check if the C compiler supports `-fPIC'.
AC_DEFUN([grub_CHECK_PIC],[
[# Position independent executable.

12
configure.ac
View file

@ -1202,13 +1202,21 @@ CFLAGS="$TARGET_CFLAGS"
# Position independent executable.
grub_CHECK_PIE
grub_CHECK_NO_PIE
grub_CHECK_NO_PIE_ONEWORD
grub_CHECK_LINK_PIE
[# Need that, because some distributions ship compilers that include
# `-fPIE' or '-fpie' and '-pie' in the default specs.
if [ x"$pie_possible" = xyes ]; then
TARGET_CFLAGS="$TARGET_CFLAGS -fno-PIE -fno-pie"
fi
if [ x"$nopie_possible" = xyes ] && [ x"$pie_possible" = xyes ]; then
TARGET_LDFLAGS="$TARGET_LDFLAGS -no-pie"
if [ x"$link_nopie_needed" = xyes ] || [ x"$pie_possible" = xyes ]; then
if [ x"$nopie_possible" = xyes ]; then
TARGET_LDFLAGS="$TARGET_LDFLAGS -no-pie"
fi
if [ x"$nopie_oneword_possible" = xyes ]; then
TARGET_LDFLAGS="$TARGET_LDFLAGS -nopie"
fi
fi]
CFLAGS="$TARGET_CFLAGS"