From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: pbonzini@redhat.com, alex.bennee@linaro.org
Subject: [PATCH v2 3/7] configure: Detect compiler support for __attribute__((alias))
Date: Wed, 23 Oct 2019 11:45:01 -0400 [thread overview]
Message-ID: <20191023154505.30521-4-richard.henderson@linaro.org> (raw)
In-Reply-To: <20191023154505.30521-1-richard.henderson@linaro.org>
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.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
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
--
2.17.1
next prev parent reply other threads:[~2019-10-23 16:53 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-23 15:44 [PATCH v2 0/7] exec: Improve code for TARGET_PAGE_BITS_VARY Richard Henderson
2019-10-23 15:44 ` [PATCH v2 1/7] cpu: use ROUND_UP() to define xxx_PAGE_ALIGN Richard Henderson
2019-10-24 11:52 ` Philippe Mathieu-Daudé
2019-10-24 12:04 ` Paolo Bonzini
2019-10-24 14:06 ` Richard Henderson
2019-10-24 14:14 ` Paolo Bonzini
2019-10-25 11:48 ` Richard Henderson
2019-10-23 15:45 ` [PATCH v2 2/7] exec: Split out variable page size support to exec-vary.c Richard Henderson
2019-10-25 14:02 ` Alex Bennée
2019-10-23 15:45 ` Richard Henderson [this message]
2019-10-25 14:04 ` [PATCH v2 3/7] configure: Detect compiler support for __attribute__((alias)) Alex Bennée
2019-11-08 16:01 ` Thomas Huth
2019-10-23 15:45 ` [PATCH v2 4/7] exec: Use const alias for TARGET_PAGE_BITS_VARY Richard Henderson
2019-10-25 14:28 ` Alex Bennée
2019-10-25 14:51 ` Peter Maydell
2019-10-25 20:43 ` Richard Henderson
2019-10-25 21:01 ` Peter Maydell
2019-10-25 21:16 ` Richard Henderson
2019-10-23 15:45 ` [PATCH v2 5/7] exec: Restrict TARGET_PAGE_BITS_VARY assert to CONFIG_DEBUG_TCG Richard Henderson
2019-10-25 14:44 ` Alex Bennée
2019-10-23 15:45 ` [PATCH v2 6/7] exec: Promote TARGET_PAGE_MASK to target_long Richard Henderson
2019-10-23 15:45 ` [PATCH v2 7/7] exec: Cache TARGET_PAGE_MASK for TARGET_PAGE_BITS_VARY Richard Henderson
2019-10-24 9:29 ` [PATCH v2 0/7] exec: Improve code " no-reply
2019-10-25 13:57 ` Alex Bennée
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