[llvm-bugs] [Bug 43738] New: cross linker with system directory fails with misleading error message

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43738

            Bug ID: 43738
           Summary: cross linker with system directory fails with
                    misleading error message
           Product: lld
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: denik at google.com
                CC: llvm-bugs at lists.llvm.org, peter.smith at linaro.org

Let's build arm64 object file.

$ clang --sysroot=/build/arm64-generic --target=aarch64 -o test.o -c test.c

Sanity check that lld passes with the correct library directory:

$ ld.lld --sysroot=/build/arm64-generic -m aarch64linux -shared -o test.so
-L/build/arm64-generic/usr/lib64 test.o -lc
$ echo $?
0

When we add a system directory BEFORE the sysroot library directory lld fails
with misleading error message:

$ ld.lld --sysroot=/build/arm64-generic -m aarch64linux -shared -o test.so
-L/usr/lib64 -L/build/arm64-generic/usr/lib64 test.o -lc
ld.lld: error: test.o is incompatible with aarch64linux
$ echo $?
1

If we add a system directory AFTER the sysroot library directory lld passes:

$ ld.lld --sysroot=/build/arm64-generic -m aarch64linux -shared -o test.so
-L/build/arm64-generic/usr/lib64 -L/usr/lib64 test.o -lc
$ echo $?
0

Here is the behavior of ld.gold (case when lld failed).
It skips incompatible libraries until it finds the right one:

$ ld.gold --sysroot=/build/arm64-generic -m aarch64linux -shared -o test.so
-L/usr/lib64 -L/build/arm64-generic/usr/lib64 test.o -lc
/usr/x86_64-pc-linux-gnu/binutils-bin/2.27.0/ld.gold.real: warning: skipping
incompatible /usr/lib64/libc.so while searching for c
$ echo $?
0

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