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97cd6a594b
1. add "-MP" prevents make-level errors when switching IDF versions, as headers may be removed 2. add macro "IS_BOOTLOADER_BUILD" to disable link file generation when compiling bootloader 3. add "<:" to avoid makefile to search it undefined variable
README
esp-idf compile and 'AR' user program as target library 'libmain.a', so we should not use
library which is named 'libmain.a'. We use 'libcore.a' instead of it.
As I konwn, you can do following:
1. rename libmain.a to libcore.a
2. change text
"*libmain.a:spi_flash.o(.literal .text .literal.* .text.*)"
to
"*libcore.a:spi_flash.o(.literal .text .literal.* .text.*)"
in file 'eagle.app.v6.common.ld'