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configure: fix intrinsics build w/older gcc

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add -flax-vector-conversions as a workaround when building the
intrinsics files. this was made available in 4.3.x, but may have been
backported. issue observed with:
cc (GCC) 4.2.1 20070831 patched [FreeBSD] (9.3).
  src/dsp/alpha_processing_sse2.c:237 incompatible type for argument 1
  of '__builtin_ia32_psrlqi128'

BUG=274

Change-Id: I996076643158ecc581facd22f9fb87bec257ccea
This commit is contained in:
James Zern 2015-11-26 00:26:24 -08:00
parent a7a954c851
commit 9eeabc077e
1 changed files with 25 additions and 0 deletions
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25
configure.ac
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@ -77,6 +77,28 @@ AS_IF([test "$GCC" = "yes" ], [
esac esac
AS_IF([test "$gcc_wht_bug" = "yes"], [ AS_IF([test "$gcc_wht_bug" = "yes"], [
TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-frename-registers])])]) TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-frename-registers])])])
# Use -flax-vector-conversions, if available, when building intrinsics with
# older versions of gcc. The flag appeared in 4.3.x, but if backported, and
# -fno-lax-vector-conversions is set, errors may occur with the intrinsics
# files along with the older system includes, e.g., emmintrin.h.
# Originally observed with cc (GCC) 4.2.1 20070831 patched [FreeBSD] (9.3).
# https://bugs.chromium.org/p/webp/issues/detail?id=274
AS_IF([test "$GCC" = "yes" ], [
case "$host_cpu" in
amd64|i?86|x86_64)
AC_COMPILE_IFELSE(
dnl only check for -flax-vector-conversions with older gcc, skip
dnl clang as it reports itself as 4.2.1, but the flag isn't needed.
[AC_LANG_SOURCE([#if !defined(__clang__) && defined(__GNUC__) && \
((__GNUC__ << 8) | __GNUC_MINOR__) < 0x403
#error old gcc
#endif
int main(void) { return 0; }
])],,
[TEST_AND_ADD_CFLAGS([INTRINSICS_CFLAGS],
[-flax-vector-conversions])])
;;
esac])
AC_SUBST([AM_CFLAGS]) AC_SUBST([AM_CFLAGS])
dnl === Check for machine specific flags dnl === Check for machine specific flags
@ -87,6 +109,7 @@ AC_ARG_ENABLE([avx2],
AS_IF([test "x$enable_avx2" != "xno" -a "x$enable_sse4_1" != "xno" \ AS_IF([test "x$enable_avx2" != "xno" -a "x$enable_sse4_1" != "xno" \
-a "x$enable_sse2" != "xno"], [ -a "x$enable_sse2" != "xno"], [
AVX2_CFLAGS="$INTRINSICS_CFLAGS $AVX2_FLAGS"
TEST_AND_ADD_CFLAGS([AVX2_FLAGS], [-mavx2]) TEST_AND_ADD_CFLAGS([AVX2_FLAGS], [-mavx2])
AS_IF([test -n "$AVX2_FLAGS"], [ AS_IF([test -n "$AVX2_FLAGS"], [
SAVED_CFLAGS=$CFLAGS SAVED_CFLAGS=$CFLAGS
@ -110,6 +133,7 @@ AC_ARG_ENABLE([sse4.1],
@<:@default=auto@:>@])) @<:@default=auto@:>@]))
AS_IF([test "x$enable_sse4_1" != "xno" -a "x$enable_sse2" != "xno"], [ AS_IF([test "x$enable_sse4_1" != "xno" -a "x$enable_sse2" != "xno"], [
SSE41_FLAGS="$INTRINSICS_CFLAGS $SSE41_FLAGS"
TEST_AND_ADD_CFLAGS([SSE41_FLAGS], [-msse4.1]) TEST_AND_ADD_CFLAGS([SSE41_FLAGS], [-msse4.1])
AS_IF([test -n "$SSE41_FLAGS"], [ AS_IF([test -n "$SSE41_FLAGS"], [
SAVED_CFLAGS=$CFLAGS SAVED_CFLAGS=$CFLAGS
@ -127,6 +151,7 @@ AC_ARG_ENABLE([sse2],
@<:@default=auto@:>@])) @<:@default=auto@:>@]))
AS_IF([test "x$enable_sse2" != "xno"], [ AS_IF([test "x$enable_sse2" != "xno"], [
SSE2_FLAGS="$INTRINSICS_CFLAGS $SSE2_FLAGS"
TEST_AND_ADD_CFLAGS([SSE2_FLAGS], [-msse2]) TEST_AND_ADD_CFLAGS([SSE2_FLAGS], [-msse2])
AS_IF([test -n "$SSE2_FLAGS"], [ AS_IF([test -n "$SSE2_FLAGS"], [
SAVED_CFLAGS=$CFLAGS SAVED_CFLAGS=$CFLAGS