From: Waldemar Kozaczuk <[email protected]> Committer: Nadav Har'El <[email protected]> Branch: master
Add libc aliases to some mathematical functions Some libraries like x265 fmpeg codec are linked to reference libc aliases of some math functions like log*, exp and pow ones. Unfortunately because our versions of these funcions are provided by musl and we do not modify musl code we cannot add aliases by simple weak_alias construct. Therefore we add a simple stub file in libc where we define functions with alias names that delegate to corresponding functions provided by musl. Another alternative would be to copy corresponding files from musl to libc directory and add weak_alias there. This would be slightly more performant as we would avoid unnecessary instructions involved in calling a function. Signed-off-by: Waldemar Kozaczuk <[email protected]> Message-Id: <[email protected]> --- diff --git a/Makefile b/Makefile --- a/Makefile +++ b/Makefile @@ -1302,6 +1302,7 @@ musl += math/tgammal.o musl += math/trunc.o musl += math/truncf.o musl += math/truncl.o +libc += math/aliases.o # Issue #867: Gcc 4.8.4 has a bug where it optimizes the trivial round- # related functions incorrectly - it appears to convert calls to any diff --git a/libc/math/aliases.c b/libc/math/aliases.c --- a/libc/math/aliases.c +++ b/libc/math/aliases.c @@ -0,0 +1,26 @@ +#include "libm.h" + +double __exp_finite(double x) +{ + return exp(x); +} + +double __log10_finite(double x) +{ + return log10(x); +} + +double __log2_finite(double x) +{ + return log2(x); +} + +double __log_finite(double x) +{ + return log(x); +} + +double __pow_finite(double x, double y) +{ + return pow(x, y); +} -- You received this message because you are subscribed to the Google Groups "OSv Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
