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* configure.ac: Allow compilation with older GCC for ARM.

This commit is contained in:
Vladimir Serbinenko 2013-12-04 12:42:09 +01:00
parent b73b70ebca
commit bdb6090d83
2 changed files with 16 additions and 4 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2013-12-04 Vladimir Serbinenko <phcoder@gmail.com>
* configure.ac: Allow compilation with older GCC for ARM.
2013-12-04 Vladimir Serbinenko <phcoder@gmail.com>
* configure.ac: Add -no-integrated-as if {addme|ame} isn't supported.

16
configure.ac
View File

@ -903,7 +903,7 @@ CFLAGS="$TARGET_CFLAGS"
# -mno-unaligned-access -mstrict-align
if test "$target_cpu" = arm; then
AC_CACHE_CHECK([for compile options to get strict alignment], [grub_cv_target_cc_strict_align], [
grub_cv_target_cc_strict_align=unknown
grub_cv_target_cc_strict_align=
for arg in -mno-unaligned-access "-Xclang -mstrict-align" -mstrict-align; do
CFLAGS="$TARGET_CFLAGS $arg -Werror"
LDFLAGS="$TARGET_LDFLAGS"
@ -914,13 +914,21 @@ if test "$target_cpu" = arm; then
fi
done])
if test x"$grub_cv_target_cc_strict_align" = xunknown; then
AC_MSG_ERROR([couldnt instruct compiler not to use unaligned access])
fi
TARGET_CFLAGS="$TARGET_CFLAGS $grub_cv_target_cc_strict_align"
if test x"$grub_cv_target_cc_strict_align" = x"-Xclang -mstrict-align"; then
TARGET_LDFLAGS="$TARGET_LDFLAGS -Qunused-arguments"
fi
AC_CACHE_CHECK([if compiler generates unaligned accesses], [grub_cv_cc_target_emits_unaligned],
[CFLAGS="$TARGET_CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
#ifdef __ARM_FEATURE_UNALIGNED
#error "unaligned"
#endif
]])],
[grub_cv_cc_target_emits_unaligned=no], [grub_cv_cc_target_emits_unaligned=yes])])
if test x$grub_cv_cc_target_emits_unaligned = xyes; then
AC_MSG_ERROR([compiler generates unaligned accesses])
fi
fi
# Set them to their new values for the tests below.