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compat: add interface overrides for libm

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wraps pow.3 exp.3 and log.3 to explicitly use backward compatible
glibc symbols. this is needed to stay compatible with old linux
versions with minor releases
This commit is contained in:
Dakoda Greaves 2022-12-01 16:55:03 -08:00 committed by Patrick Lodder
parent f449518940
commit 87b1dc9300
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2 changed files with 45 additions and 0 deletions
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3
configure.ac
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@ -504,7 +504,10 @@ if test x$use_glibc_compat != xno; then
AC_MSG_RESULT($fdelt_type)
AC_DEFINE_UNQUOTED(FDELT_TYPE, $fdelt_type,[parameter and return value type for __fdelt_chk])
AX_CHECK_LINK_FLAG([[-Wl,--wrap=__divmoddi4]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=__divmoddi4"])
AX_CHECK_LINK_FLAG([[-Wl,--wrap=exp]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=exp"])
AX_CHECK_LINK_FLAG([[-Wl,--wrap=log]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=log"])
AX_CHECK_LINK_FLAG([[-Wl,--wrap=log2f]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=log2f"])
AX_CHECK_LINK_FLAG([[-Wl,--wrap=pow]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=pow"])
else
AC_SEARCH_LIBS([clock_gettime],[rt])
fi

42
src/compat/glibc_compat.cpp
View File

@ -73,3 +73,45 @@ extern "C" float __wrap_log2f(float x)
{
return log2f_old(x);
}
extern "C" double exp_old(double x);
#ifdef __i386__
__asm(".symver exp_old,exp@GLIBC_2.0");
#elif defined(__amd64__)
__asm(".symver exp_old,exp@GLIBC_2.2.5");
#elif defined(__arm__)
__asm(".symver exp_old,exp@GLIBC_2.4");
#elif defined(__aarch64__)
__asm(".symver exp_old,exp@GLIBC_2.17");
#endif
extern "C" double __wrap_exp(double x) {
return exp_old(x);
}
extern "C" double log_old(double x);
#ifdef __i386__
__asm(".symver log_old,log@GLIBC_2.0");
#elif defined(__amd64__)
__asm(".symver log_old,log@GLIBC_2.2.5");
#elif defined(__arm__)
__asm(".symver log_old,log@GLIBC_2.4");
#elif defined(__aarch64__)
__asm(".symver log_old,log@GLIBC_2.17");
#endif
extern "C" double __wrap_log(double x) {
return log_old(x);
}
extern "C" double pow_old(double x, double y);
#ifdef __i386__
__asm(".symver pow_old,pow@GLIBC_2.0");
#elif defined(__amd64__)
__asm(".symver pow_old,pow@GLIBC_2.2.5");
#elif defined(__arm__)
__asm(".symver pow_old,pow@GLIBC_2.4");
#elif defined(__aarch64__)
__asm(".symver pow_old,pow@GLIBC_2.17");
#endif
extern "C" double __wrap_pow(double x, double y) {
return pow_old(x,y);
}