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Martin Errenst 7f5a8283af add some comments 10 months ago
.gitignore 0b2764ea61 use cmake 10 months ago
CMakeLists.txt 7f5a8283af add some comments 10 months ago
Makefile e40bd023fb initial commit 10 months ago
Readme.md 0a8fbdc588 fix h2 lines 10 months ago
dummy.cpp e40bd023fb initial commit 10 months ago
main.cpp 0b2764ea61 use cmake 10 months ago

Readme.md

Motivation

Print as much information about the build process as you can get from within the binary. Espacially, compiler flags - they are quite important when comparing performance. The information should be included in the binary, so it can't be lost and is right next to, for example, a benchmark result. So there's no chance to mix up different flags.

Other options

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).

Known limitations

  • Works only with GCC for now.