Why does the above specs snippet cause gcc to forget it's linking against thumb libraries?
The -mthumb support works by passing extra -L options to the linker. Try using -v and looking at the linker options.
You didn't include your linker script, but a possibility here is that you are overriding path names in your linker script, preventing the -L options from working as intended.
Also, note that there is a linker --verbose switch that may help debug what the linker is doing.
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Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
