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configure: Change check for uint128_t

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Check for ability to divide uint128_t values, since that what
we actually use it for (in gstutils.c).  The existence of a
uint128_t type doesn't mean the compiler can actually generate
code for it.  Also make sure that we can actually link the
result successfully.

Fixes bug #614767.
This commit is contained in:
David Schleef 2010-04-05 13:46:23 -07:00 committed by Tim-Philipp Müller
parent 2e35581939
commit b090081f4f
1 changed files with 7 additions and 5 deletions
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12
configure.ac
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@ -320,12 +320,14 @@ dnl *** checks for structures ***
dnl *** checks for compiler characteristics ***
dnl check if the compiler supports __uint128_t (gcc)
dnl Actually check for 128-bit division, since that's what we use
dnl uint128_t for.
AC_CACHE_CHECK(for __uint128_t, gst_cv_uint128_t,
AC_TRY_COMPILE([ ], [
unsigned long long v1 = 1024ULL;
unsigned long long v2 = 0x8000000000000000ULL;
__uint128_t u = ((__uint128_t)v1)*((__uint128_t)v2);
AC_TRY_LINK([ ], [
static __uint128_t v1 = 100;
static __uint128_t v2 = 10;
static __uint128_t u;
u = v1 / v2;
return 0;
], [
gst_cv_uint128_t=yes