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61 lines
2.2 KiB
Diff
61 lines
2.2 KiB
Diff
commit 388b4f1a02f3a801965028bbfcd48d905638b797
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Fri Jun 23 14:38:46 2017 -0700
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Avoid .symver on common symbols [BZ #21666]
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The .symver directive on common symbol just creates a new common symbol,
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not an alias and the newer assembler with the bug fix for
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https://sourceware.org/bugzilla/show_bug.cgi?id=21661
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will issue an error. Before the fix, we got
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$ readelf -sW libc.so | grep "loc[12s]"
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5109: 00000000003a0608 8 OBJECT LOCAL DEFAULT 36 loc1
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5188: 00000000003a0610 8 OBJECT LOCAL DEFAULT 36 loc2
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5455: 00000000003a0618 8 OBJECT LOCAL DEFAULT 36 locs
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6575: 00000000003a05f0 8 OBJECT GLOBAL DEFAULT 36 locs@GLIBC_2.2.5
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7156: 00000000003a05f8 8 OBJECT GLOBAL DEFAULT 36 loc1@GLIBC_2.2.5
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7312: 00000000003a0600 8 OBJECT GLOBAL DEFAULT 36 loc2@GLIBC_2.2.5
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in libc.so. The versioned loc1, loc2 and locs have the wrong addresses.
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After the fix, we got
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$ readelf -sW libc.so | grep "loc[12s]"
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6570: 000000000039e3b8 8 OBJECT GLOBAL DEFAULT 34 locs@GLIBC_2.2.5
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7151: 000000000039e3c8 8 OBJECT GLOBAL DEFAULT 34 loc1@GLIBC_2.2.5
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7307: 000000000039e3c0 8 OBJECT GLOBAL DEFAULT 34 loc2@GLIBC_2.2.5
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[BZ #21666]
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* misc/regexp.c (loc1): Add __attribute__ ((nocommon));
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(loc2): Likewise.
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(locs): Likewise.
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---
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misc/regexp.c | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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--- a/misc/regexp.c
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+++ b/misc/regexp.c
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@@ -29,14 +29,15 @@
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
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-/* Define the variables used for the interface. */
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-char *loc1;
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-char *loc2;
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+/* Define the variables used for the interface. Avoid .symver on common
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+ symbol, which just creates a new common symbol, not an alias. */
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+char *loc1 __attribute__ ((nocommon));
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+char *loc2 __attribute__ ((nocommon));
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compat_symbol (libc, loc1, loc1, GLIBC_2_0);
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compat_symbol (libc, loc2, loc2, GLIBC_2_0);
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/* Although we do not support the use we define this variable as well. */
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-char *locs;
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+char *locs __attribute__ ((nocommon));
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compat_symbol (libc, locs, locs, GLIBC_2_0);
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