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configure: Detect compiler support for __attribute__((alias)) 

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 <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-10-13 16:12:19 -07:00
parent 7886cefe5d
commit db8aaae822
1 changed files with 19 additions and 0 deletions
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19
configure vendored
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@ -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