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@@ -0,0 +1,16 @@
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+## OSX ESP firmware build notes
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+
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+`error: unknown type name 'ptrdiff_t'` when installing pass-2 core C compiler.
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+
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+Solution: `https://github.com/pfalcon/esp-open-sdk/issues/45` delete define/endef statements
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+
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+# Relevant output
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+
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+Xtensa toolchain is built, to use it:
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+
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+`export PATH=/Users/aria/code/espbuild/esp-open-sdk/xtensa-lx106-elf/bin:$PATH`
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+
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+Espressif ESP8266 SDK is installed. Toolchain contains only Open Source components
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+To link external proprietary libraries add:
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+
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+`xtensa-lx106-elf-gcc -I/Users/aria/code/espbuild/esp-open-sdk/sdk/include -L/Users/aria/code/espbuild/esp-open-sdk/sdk/lib`
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