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[PATCH v2 3/7] configure: Detect compiler support for __attribute__((ali
From: |
Richard Henderson |
Subject: |
[PATCH v2 3/7] configure: Detect compiler support for __attribute__((alias)) |
Date: |
Wed, 23 Oct 2019 11:45:01 -0400 |
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 <address@hidden>
---
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
- [PATCH v2 1/7] cpu: use ROUND_UP() to define xxx_PAGE_ALIGN, (continued)
[PATCH v2 6/7] exec: Promote TARGET_PAGE_MASK to target_long, Richard Henderson, 2019/10/23
[PATCH v2 5/7] exec: Restrict TARGET_PAGE_BITS_VARY assert to CONFIG_DEBUG_TCG, Richard Henderson, 2019/10/23
[PATCH v2 7/7] exec: Cache TARGET_PAGE_MASK for TARGET_PAGE_BITS_VARY, Richard Henderson, 2019/10/23
[PATCH v2 3/7] configure: Detect compiler support for __attribute__((alias)),
Richard Henderson <=
[PATCH v2 2/7] exec: Split out variable page size support to exec-vary.c, Richard Henderson, 2019/10/23
[PATCH v2 4/7] exec: Use const alias for TARGET_PAGE_BITS_VARY, Richard Henderson, 2019/10/23
Re: [PATCH v2 0/7] exec: Improve code for TARGET_PAGE_BITS_VARY, no-reply, 2019/10/24