Some libraries like x265 fmpeg codec is 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 simple stub files 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]> --- Makefile | 5 +++++ libc/math/exp.c | 6 ++++++ libc/math/log.c | 6 ++++++ libc/math/log10.c | 6 ++++++ libc/math/log2.c | 6 ++++++ libc/math/pow.c | 6 ++++++ 6 files changed, 35 insertions(+) create mode 100644 libc/math/exp.c create mode 100644 libc/math/log.c create mode 100644 libc/math/log10.c create mode 100644 libc/math/log2.c create mode 100644 libc/math/pow.c diff --git a/Makefile b/Makefile index 2270206b..c475f311 100644 --- a/Makefile +++ b/Makefile @@ -1145,6 +1145,7 @@ musl += math/erf.o musl += math/erff.o musl += math/erfl.o musl += math/exp.o +libc += math/exp.o musl += math/exp10.o musl += math/exp10f.o musl += math/exp10l.o @@ -1214,13 +1215,16 @@ musl += math/llround.o musl += math/llroundf.o musl += math/llroundl.o musl += math/log.o +libc += math/log.o musl += math/log10.o +libc += math/log10.o musl += math/log10f.o musl += math/log10l.o musl += math/log1p.o musl += math/log1pf.o musl += math/log1pl.o musl += math/log2.o +libc += math/log2.o musl += math/log2f.o musl += math/log2l.o musl += math/logb.o @@ -1253,6 +1257,7 @@ musl += math/nexttoward.o musl += math/nexttowardf.o musl += math/nexttowardl.o musl += math/pow.o +libc += math/pow.o musl += math/powf.o musl += math/powl.o musl += math/remainder.o diff --git a/libc/math/exp.c b/libc/math/exp.c new file mode 100644 index 00000000..cba01a32 --- /dev/null +++ b/libc/math/exp.c @@ -0,0 +1,6 @@ +#include "libm.h" + +double __exp_finite(double x) +{ + return exp(x); +} diff --git a/libc/math/log.c b/libc/math/log.c new file mode 100644 index 00000000..50709e09 --- /dev/null +++ b/libc/math/log.c @@ -0,0 +1,6 @@ +#include "libm.h" + +double __log_finite(double x) +{ + return log(x); +} diff --git a/libc/math/log10.c b/libc/math/log10.c new file mode 100644 index 00000000..39201935 --- /dev/null +++ b/libc/math/log10.c @@ -0,0 +1,6 @@ +#include "libm.h" + +double __log10_finite(double x) +{ + return log10(x); +} diff --git a/libc/math/log2.c b/libc/math/log2.c new file mode 100644 index 00000000..4167230a --- /dev/null +++ b/libc/math/log2.c @@ -0,0 +1,6 @@ +#include "libm.h" + +double __log2_finite(double x) +{ + return log2(x); +} diff --git a/libc/math/pow.c b/libc/math/pow.c new file mode 100644 index 00000000..28ba1d5d --- /dev/null +++ b/libc/math/pow.c @@ -0,0 +1,6 @@ +#include "libm.h" + +double __pow_finite(double x, double y) +{ + return pow(x, y); +} -- 2.19.1 -- 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.
