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add some notes in the readme

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Martin Errenst 2017-08-27 14:12:34 +02:00
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Another option would be -g -grecord-gcc-switches and search for DW_AT_producer.
Sadly, this doesn't produce the wanted information with clang:
clang++: DW_AT_producer : (indirect string, offset: 0x0): clang version 3.9.1 (tags/RELEASE_391/final)
g++: DW_AT_producer : (indirect string, offset: 0x37): GNU C++ 4.9.4 -mtune=generic -march=x86-64 -g -O3 -frecord-gcc-switches -fstack-protector-strong
Passing the CPPFLAGS and so on as -DMY_FLAGS=.... to the compiler call will not include some information set by the compiler itself (compare the parameters set in the Makefile with the printed output).