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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Using Clang as linker warns about various command line flags, "-pg", "-no-pie", "-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang" if specified"
href="https://bugs.llvm.org/show_bug.cgi?id=46612">46612</a>
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<th>Summary</th>
<td>Using Clang as linker warns about various command line flags, "-pg", "-no-pie", "-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang" if specified
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>keescook@chromium.org
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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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<pre>When calling out to "ld", Clang warns about
"-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang" (and
"-pg" and "-no-pie"):
$ cat foo.c
int global = 5;
$ clang -Wall -ftrivial-auto-var-init=zero
-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang -c -o
foo.o foo.c
$ cat link.lds
SECTIONS
{
. = SIZEOF_HEADERS;
.text : { *(.text) } :text
}
PHDRS
{
text PT_LOAD FLAGS(5) FILEHDR PHDRS;
}
$ clang -Wall -ftrivial-auto-var-init=zero
-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
-nostdlib -nostartfiles -Wl,-T,link.lds foo.o -o linked.o
clang-11: warning: argument unused during compilation:
'-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang'
[-Wunused-command-line-argument]
For example, in the Linux kernel:
<a href="https://groups.google.com/d/msg/clang-built-linux/ghiOQ5KIFug/LOmK7sJcBgAJ">https://groups.google.com/d/msg/clang-built-linux/ghiOQ5KIFug/LOmK7sJcBgAJ</a></pre>
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