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2de2ec4404
They're binary-compatible, the old versions are more widely available and the new versions are more highly optimized. We prefer the former.
19 lines
778 B
C
19 lines
778 B
C
// This header forces the use of a particular version of glibc symbols.
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// This can make the resulting binary portable to systems with older glibcs.
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//
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// It must be included in each TU, with CFLAGS="-include glibc_compat.h" etc.
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//
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// We only list symbols known to be used. This is paired with a test enforcing
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// the max glibc symbol version. If the test fails, the list should be extended.
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// Find the old alternatives version to target with e.g.:
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// objdump -T /lib/x86_64-linux-gnu/lib{c,m,pthread,rt}.so.* | grep "\bexpf\b"
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#define FORCE_SYMBOL_VERSION(sym, version) \
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__asm__(".symver " #sym "," #sym "@" #version)
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FORCE_SYMBOL_VERSION(expf, GLIBC_2.2.5);
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FORCE_SYMBOL_VERSION(log, GLIBC_2.2.5);
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FORCE_SYMBOL_VERSION(pow, GLIBC_2.2.5);
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#undef FORCE_SYMBOL_VERSION
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