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Bug 1181441 - Configure check for no-tls rust toolchain. r=ted

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By default the rust standard library uses linker-assisted
thread-local storage, which isn't supported on MacOS X 10.6.
If we're targetting that version make sure we can link code
built with $RUSTC.

If so it's presumedly been built with alternate support.
This commit is contained in:
Ralph Giles 2015-07-07 15:14:53 -07:00
parent a111e7df43
commit 671411c3a1
1 changed files with 25 additions and 5 deletions
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30
configure.in
View File

@ -476,17 +476,37 @@ dnl Special MacOS X checks
dnl ========================================================
if test -n "$MACOSX_DEPLOYMENT_TARGET" -a -n "$MOZ_RUST"; then
AC_MSG_CHECKING([MacOS X compatibility with rust])
# rustc doesn't support MacOS X 10.6 or earlier.
AC_MSG_CHECKING([rustc compatibility with MacOS X])
# Stock rustc doesn't support MacOS X 10.6 or earlier.
# https://github.com/rust-lang/rust/issues/25342
_MACOSX_TARGET_MINOR=`echo "$MACOSX_DEPLOYMENT_TARGET" | cut -d. -f2`
if test "$_MACOSX_TARGET_MINOR" -lt 7; then
AC_MSG_ERROR([rustc does not support MacOS X $MACOSX_DEPLOYMENT_TARGET
Add 'ac_add_options --enable-macos-target=10.7' (or later)
to mozconfig, or disable rust support.])
dnl Test C linkage against rust code to see if the rust
dnl toolchain output is compatible.
cat > conftest.rs <<EOF
[#[no_mangle]]
pub extern fn rusty_answer() -> u8 { 42 }
EOF
ac_try="$RUSTC --crate-type staticlib -o conftest.a conftest.rs >/dev/null"
AC_TRY_EVAL(ac_try)
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS conftest.a -lpthread -lm"
AC_TRY_LINK_FUNC([rusty_answer], [
AC_MSG_RESULT([$MACOSX_DEPLOYMENT_TARGET is ok with this rustc])
], [
AC_MSG_RESULT([cannot link on $MACOSX_DEPLOYMENT_TARGET])
MOZ_RUST=
])
LDFLAGS=$save_LDFLAGS
rm -rf conftest*
else
AC_MSG_RESULT([$MACOSX_DEPLOYMENT_TARGET is ok])
fi
if test -z "$MOZ_RUST"; then
AC_MSG_ERROR([rustc does not support MacOS X $MACOSX_DEPLOYMENT_TARGET
Add 'ac_add_options --enable-macos-target=10.7' (or later)
to mozconfig, disable rust support, or use an alternate toolchain.])
fi
fi
dnl ========================================================