From db8aaae822dfdb18d993a686a146efcc63c216c0 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Sun, 13 Oct 2019 16:12:19 -0700 Subject: [PATCH] configure: Detect compiler support for __attribute__((alias)) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Such support is present almost everywhere, except for Xcode 9. It is added in Xcode 10, but travis uses xcode9 by default, so we should support it for a while yet. Reviewed-by: Alex Bennée Signed-off-by: Richard Henderson --- configure | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/configure b/configure index 145fcabbb3..3a9862fe5e 100755 --- a/configure +++ b/configure @@ -5518,6 +5518,21 @@ if compile_prog "" "" ; then vector16=yes fi +######################################## +# See if __attribute__((alias)) is supported. +# This false for Xcode 9, but has been remedied for Xcode 10. +# Unfortunately, travis uses Xcode 9 by default. + +attralias=no +cat > $TMPC << EOF +int x = 1; +extern const int y __attribute__((alias("x"))); +int main(void) { return 0; } +EOF +if compile_prog "" "" ; then + attralias=yes +fi + ######################################## # check if getauxval is available. @@ -7083,6 +7098,10 @@ if test "$vector16" = "yes" ; then echo "CONFIG_VECTOR16=y" >> $config_host_mak fi +if test "$attralias" = "yes" ; then + echo "CONFIG_ATTRIBUTE_ALIAS=y" >> $config_host_mak +fi + if test "$getauxval" = "yes" ; then echo "CONFIG_GETAUXVAL=y" >> $config_host_mak fi