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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
20 lines
441 B
C
20 lines
441 B
C
#ifndef RUBY_ADDR2LINE_H
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#define RUBY_ADDR2LINE_H
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/**********************************************************************
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addr2line.h -
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$Author$
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Copyright (C) 2010 Shinichiro Hamaji
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**********************************************************************/
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#if (defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H))
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void
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rb_dump_backtrace_with_lines(int num_traces, void **traces);
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#endif /* USE_ELF */
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#endif /* RUBY_ADDR2LINE_H */
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