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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-9 fails to drop static symbols with an alias"
href="https://bugs.llvm.org/show_bug.cgi?id=43243">43243</a>
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<th>Summary</th>
<td>clang-9 fails to drop static symbols with an alias
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>9.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>arnd@linaro.org
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>A linux kernel randconfig build resulted in a link error from duplicated
symbols that were declared static:
drivers/pinctrl/aspeed/pinctrl-aspeed-g6.o:(.data+0x10): multiple definition of
`sig_exprs_0_GPIOA0'
drivers/pinctrl/aspeed/pinctrl-aspeed-g4.o:(.data+0x8): first defined here
drivers/pinctrl/aspeed/pinctrl-aspeed-g6.o:(.data+0x28): multiple definition of
`sig_exprs_1_GPIOA1'
drivers/pinctrl/aspeed/pinctrl-aspeed-g4.o:(.data+0x18): first defined here
drivers/pinctrl/aspeed/pinctrl-aspeed-g6.o:(.data+0x40): multiple definition of
`sig_exprs_2_GPIOA2'
drivers/pinctrl/aspeed/pinctrl-aspeed-g4.o:(.data+0x28): first defined here
...
I reduced this to a trivial test case:
<a href="https://godbolt.org/z/Azn8pH">https://godbolt.org/z/Azn8pH</a>
$ cat pinctrl-aspeed-g6.i
static const int sig_exprs_SCL11_I2C11[] = {};
static const int sig_exprs_0_SCL11
__attribute__((alias("sig_exprs_SCL11_I2C11")));
$ clang-9 -Wall -O2 -c pinctrl-aspeed-g6.i
$ objdump --syms pinctrl-aspeed-g6.o
pinctrl-aspeed-g6.o: file format elf64-x86-64
SYMBOL TABLE:
0000000000000000 l df *ABS* 0000000000000000 pinctrl-aspeed-g6.i
0000000000000000 g O .rodata 0000000000000000 sig_exprs_0_SCL11
With clang-10, this problem is fixed:
$ clang-10 -Wall -O2 -c pinctrl-aspeed-g6.i
$ objdump --syms pinctrl-aspeed-g6.o
pinctrl-aspeed-g6.o: file format elf64-x86-64
SYMBOL TABLE:
0000000000000000 l df *ABS* 0000000000000000 pinctrl-aspeed-g6.i</pre>
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