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On Wed, 16 Sep 2009 21:36:37 +0800 |
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Xi Shen <davidshen84@××××××××××.com> wrote: |
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> when reading that doc, i cannot understand the following script |
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> |
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> #!/bin/bash |
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> exec /usr/lib/distcc/bin/sparc-unknown-linux-gnu-g${0:$[-2]} "$@" |
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> |
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> what does the ":" do here? |
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> |
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> |
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|
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The construction "${0:$[-2]}" will return the last two characters of |
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the $0 string, with the $0 string being the name of the called script. |
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These last two characters are appended to the string "sparc-unknown-linux-gnu-g". |
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After glancing at the section in cross-compiling-distcc.xml, it seems |
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that this particular script will be called via a symlink, which will |
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be one of gcc, g++, c++. The last two chars of the link name are thus |
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appended to "sparc-unknown-linux-gnu-g" to form the name of an execuatable, |
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e.g. /usr/lib/distcc/bin/sparc-unknown-linux-gnu-gcc. |
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|
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Frank Peters |
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