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configure: check if "-lrt" is required for using the Dasynq timers #588

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Merged
mobin-2008 merged 2 commits into from
Oct 14, 2026
Merged

configure: check if "-lrt" is required for using the Dasynq timers #588

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e1cd2e0
configure: be consistent with Makefiles about the linker flags usage
mobin-2008 Sep 26, 2026
8062e5b
configure: check if "-lrt" is required for using the Dasynq timers
mobin-2008 Aug 28, 2026
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58 changes: 54 additions & 4 deletions configure
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Original file line number Diff line number Diff line change
Expand Up @@ -116,8 +116,8 @@ try_compile_source()
# LDFLAGS, LDFLAGS_EXTRA - any predetermined flags
try_link_object()
{
eval $CXX $LDFLAGS $LDFLAGS_EXTRA ${3:-} '"$configtmpdir"/"$1"' \
-o '"$configtmpdir"/"$2"' > /dev/null 2>&1
eval $CXX '"$configtmpdir"/"$1"' -o '"$configtmpdir"/"$2"' $LDFLAGS \
$LDFLAGS_EXTRA ${3:-} > /dev/null 2>&1
}

# Test if the compiler accepts an argument (for compilation only); if so add it to named variable.
Expand Down Expand Up @@ -235,6 +235,37 @@ int main()
_EOF
}

write_librt_check()
{
cat << _EOF > "$configtmpdir"/librt-check.cc
#include <dasynq.h>

using rearm = dasynq::rearm;
using loop_t = dasynq::event_loop_n;

class my_timer : public loop_t::timer_impl<my_timer>
{
public:
rearm timer_expiry(loop_t &, int expiry_count)
{
return rearm::REARM;
}
};

int main()
{
loop_t l1;
my_timer t1;

t1.add_timer(l1);
t1.arm_timer_rel(l1, {1,0});
l1.run();
Comment on lines +260 to +262

@davmac314 davmac314 Oct 11, 2026

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For completeness this really should arm the timer also (arm_timer_rel(l1, {1,0}); or similar).


return 0;
}
_EOF
}

# Quote a string to preserve its original form after shell evaluation (except that an empty
# string remains as an empty string).
quote_for_shell()
Expand Down Expand Up @@ -636,8 +667,27 @@ if [ "$AUTO_LDFLAGS" = true ] && [ "$AUTO_CXXFLAGS" = true ]; then
HAS_LTO="false"
fi
fi
if [ "$AUTO_LDFLAGS_BASE" = true ] && [ "$PLATFORM" = FreeBSD ]; then
check_link_argument LDFLAGS_BASE -lrt
if [ "$AUTO_LDFLAGS_BASE" = true ]; then
info "Checking whether linking with librt is required..."
write_librt_check
# CPPFLAGS is included in the following check, because it uses the Dasynq library that can be
# configured by compile-time macros, which can influence the result of this check. For example,
# a user under Linux may specify "-DDASYNQ_HAVE_EPOLL=0" to disable the epoll backend, which
# currently also causes Dasynq to use POSIX timers.
if ! try_compile_source librt-check.cc librt-check.o "$CPPFLAGS -Idasynq/include"; then
sub_info_error "Couldn't compile the test source for the librt check."
fi
if ! try_link_object librt-check.o librt-check; then
if try_link_object librt-check.o librt-check -lrt; then
sub_info "Yes."
LDFLAGS_BASE="$LDFLAGS_BASE -lrt"
LDFLAGS_BASE="${LDFLAGS_BASE# }"
else
sub_info_error "Couldn't link the test object for the librt check."
fi
else
sub_info "No."
fi
fi
if [ "$SUPPORT_CAPABILITIES" != 0 ]; then
if [ "$AUTO_LDFLAGS_LIBCAP" = true ]; then
Expand Down
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