Fix gcc rule-based toolchain example #399
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Passing the `--sysroot` argument on linking causes the following linker error ``` <PATH>/external/_main~_repo_rules~gcc-linux-x86_64/bin/../lib/gcc/x86_64-buildroot-linux-gnu/13.3.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: cannot find /lib64/libm.so.6: No such file or directory <PATH>external/_main~_repo_rules~gcc-linux-x86_64/bin/../lib/gcc/x86_64-buildroot-linux-gnu/13.3.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: cannot find /lib64/libmvec.so.1: No such file or directory collect2: error: ld returned 1 exit status ``` The cause could be tracked to the `sysroot/usr/lib` directory, where `libm.a` and `libmvec.a` reside but is not fully understood. In any case, it seems that using copies of the files in that directory instead of symlinks does not produce the errors reported above during linking and with the `--sysroot` argument. Passing the sysroot during the compilation but not linking succeeds. The assumption being that the paths to the sysroot are then resolved relatively to the compiler. See also: https://github.com/agoessling/bazel_bootlin/blob/master/toolchains/toolchains.bzl#L204 Close issue bazelbuild#395
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Passing the
--sysrootargument on linking causes the following linker errorThe cause could be tracked to the
sysroot/usr/libdirectory, wherelibm.aandlibmvec.areside but is not fully understood. In any case, it seems that using copies of the files in that directory instead of symlinks does not produce the errors reported above during linking and with the--sysrootargument.Passing the sysroot during the compilation but not linking succeeds. The assumption being that the paths to the sysroot are then resolved relatively to the compiler.
See also:
https://github.com/agoessling/bazel_bootlin/blob/master/toolchains/toolchains.bzl#L204
Close issue #395