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trini/gist:a9fec05a1010611f287661e58b17cbd0

Created January 17, 2024 17:04
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gcc/cpp vs llvm cpp
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gistfile1.txt
$ cat bad_defconfig
# CONFIG_WATCHDOG_AUTOSTART is not set
$ gcc -E -nostdinc -undef -x assembler-with-cpp bad_defconfig -o generated_defconfig
$ cat generated_defconfig
# 0 "bad_defconfig"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "bad_defconfig"
# CONFIG_WATCHDOG_AUTOSTART is not set
$ clang-16 -E -nostdinc -undef -x assembler-with-cpp bad_defconfig -o generated_defconfig
$ cat generated_defconfig
# 1 "bad_defconfig"
# 1 "<built-in>" 1
# 1 "bad_defconfig" 2
# CONFIG_WATCHDOG_AUTOSTART is not set
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