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GCC-7 and glibc-2.27 compat code

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This commit is contained in:
Chun Kuan Lee 2018-05-05 13:18:40 +00:00
parent e24bf1ce18
commit 908c1d7745
3 changed files with 49 additions and 0 deletions
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3
configure.ac
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@ -595,6 +595,8 @@ if test x$use_glibc_compat != xno; then
[ fdelt_type="long int"])
AC_MSG_RESULT($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=log2f]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=log2f"])
else
AC_SEARCH_LIBS([clock_gettime],[rt])
fi
@ -1284,6 +1286,7 @@ AC_SUBST(DEBUG_CPPFLAGS)
AC_SUBST(WARN_CXXFLAGS)
AC_SUBST(NOWARN_CXXFLAGS)
AC_SUBST(DEBUG_CXXFLAGS)
AC_SUBST(COMPAT_LDFLAGS)
AC_SUBST(ERROR_CXXFLAGS)
AC_SUBST(GPROF_CXXFLAGS)
AC_SUBST(GPROF_LDFLAGS)

1
src/Makefile.am
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@ -380,6 +380,7 @@ libbitcoin_util_a_SOURCES = \
if GLIBC_BACK_COMPAT
libbitcoin_util_a_SOURCES += compat/glibc_compat.cpp
AM_LDFLAGS += $(COMPAT_LDFLAGS)
endif
# cli: shared between bitcoin-cli and bitcoin-qt

45
src/compat/glibc_compat.cpp
View file

@ -7,6 +7,7 @@
#endif
#include <cstddef>
#include <cstdint>
#if defined(HAVE_SYS_SELECT_H)
#include <sys/select.h>
@ -27,3 +28,47 @@ extern "C" FDELT_TYPE __fdelt_warn(FDELT_TYPE a)
return a / __NFDBITS;
}
extern "C" FDELT_TYPE __fdelt_chk(FDELT_TYPE) __attribute__((weak, alias("__fdelt_warn")));
#if defined(__i386__) || defined(__arm__)
extern "C" int64_t __udivmoddi4(uint64_t u, uint64_t v, uint64_t* rp);
extern "C" int64_t __wrap___divmoddi4(int64_t u, int64_t v, int64_t* rp)
{
int32_t c1 = 0, c2 = 0;
int64_t uu = u, vv = v;
int64_t w;
int64_t r;
if (uu < 0) {
c1 = ~c1, c2 = ~c2, uu = -uu;
}
if (vv < 0) {
c1 = ~c1, vv = -vv;
}
w = __udivmoddi4(uu, vv, (uint64_t*)&r);
if (c1)
w = -w;
if (c2)
r = -r;
*rp = r;
return w;
}
#endif
extern "C" float log2f_old(float x);
#ifdef __i386__
__asm(".symver log2f_old,log2f@GLIBC_2.1");
#elif defined(__amd64__)
__asm(".symver log2f_old,log2f@GLIBC_2.2.5");
#elif defined(__arm__)
__asm(".symver log2f_old,log2f@GLIBC_2.4");
#elif defined(__aarch64__)
__asm(".symver log2f_old,log2f@GLIBC_2.17");
#endif
extern "C" float __wrap_log2f(float x)
{
return log2f_old(x);
}