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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ld cannot find crtbegin.o Amazon AMI, ignores -L/path/.../"
href="https://bugs.llvm.org/show_bug.cgi?id=35992">35992</a>
</td>
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<th>Summary</th>
<td>ld cannot find crtbegin.o Amazon AMI, ignores -L/path/.../
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>omarsa@seas.upenn.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>I compiled from source LLVM 6.0 on an Amazon Linux AMI 2017.09.1.20171120
x86_64
When attempting to compile a trivial program:
clang test.c -o test
ld fails with the following output:
/usr/bin/ld: cannot find crtbegin.o: No such file or directory
clang-6.0: error: linker command failed with exit code 1 (use -v to see
invocation)
Doing a find for crtbegin.o yields:
$ sudo find / -name "crtbegin.o" | grep -v "llvm"
/usr/lib/gcc/x86_64-amazon-linux/7/crtbegin.o
/usr/lib/gcc/x86_64-amazon-linux/4.8.5/32/crtbegin.o
/usr/lib/gcc/x86_64-amazon-linux/4.8.5/crtbegin.o
Adding -L/usr/lib/gcc/x86_64-amazon-linux/7/ or
-L/usr/lib/gcc/x86_64-amazon-linux/4.8.5/ did not help.
Running in verbose mode I can see the exact place it fails:
"/usr/bin/ld" --eh-frame-hdr -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -o a.out /usr/lib/../lib64/crt1.o
/usr/lib/../lib64/crti.o crtbegin.o -L/usr/lib/gcc/x86_64-amazon-linux/4.8.5/
-L/opt/nvidia/cuda/lib64/ -L/lib/../lib64 -L/usr/lib/../lib64
-L/home/ec2-user/Programs/llvm6-build/bin/../lib -L/lib -L/usr/lib
/tmp/gaussian-5f5074.o -lcudart_static -ldl -lrt -lstdc++ -lm -lgcc_s -lgcc
-lpthread -lc -lgcc_s -lgcc crtend.o /usr/lib/../lib64/crtn.o
/usr/bin/ld: cannot find crtbegin.o: No such file or directory
It seems to ignore the two directories I passed in.
To fix it, I straced the paths that ld was checking:
<span class="quote">> strace -f clang test.c -o test 2>&1 | grep "crtbegin.o"</span >
access("/home/ec2-user/Programs/llvm6-build/lib/clang/6.0.0/crtbegin.o", F_OK)
= -1 ENOENT (No such file or directory)
access("/home/ec2-user/Programs/llvm6-build/lib/clang/6.0.0/lib/linux/crtbegin.o",
F_OK) = -1 ENOENT (No such file or directory)
access("/lib/../lib64/crtbegin.o", F_OK) = -1 ENOENT (No such file or
directory)
access("/usr/lib/../lib64/crtbegin.o", F_OK) = -1 ENOENT (No such file or
directory)
access("/home/ec2-user/Programs/llvm6-build/bin/../lib/crtbegin.o", F_OK) = -1
ENOENT (No such file or directory)
access("/lib/crtbegin.o", F_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/crtbegin.o", F_OK) = -1 ENOENT (No such file or directory)
[pid 6469] execve("/usr/bin/ld", ["/usr/bin/ld", "--eh-frame-hdr", "-m",
"elf_x86_64", "-dynamic-linker", "/lib64/ld-linux-x86-64.so.2", "-o", "test",
"/usr/lib/../lib64/crt1.o", "/usr/lib/../lib64/crti.o", "crtbegin.o",
"-L/lib/../lib64", "-L/usr/lib/../lib64",
"-L/home/ec2-user/Programs/llvm6-"..., "-L/lib", "-L/usr/lib", ...], [/* 14
vars */] <unfinished ...>
[pid 6469] open("crtbegin.o", O_RDONLY) = -1 ENOENT (No such file or
directory)
[pid 6469] write(2, "crtbegin.o", 10crtbegin.o) = 10
I ended up creating symlinks to the folders where ld was looking:
<span class="quote">> sudo ln -s /usr/lib/gcc/x86_64-amazon-linux/7/crtbegin.o /lib/../lib64/
> sudo ln -s /usr/lib/gcc/x86_64-amazon-linux/7/crtend.o /lib/../lib64/</span >
This fixed all my issues.</pre>
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