From: Peter Maydell <peter.mayd...@linaro.org> The AVX2 optimization test assumes that the object format is ELF and the system has the readelf utility. If this isn't true then configure might fail or emit a warning (since in a pipe "foo | bar >/dev/null 2>&1" does not redirect the stderr of foo, only of bar). Adjust the check so that if we don't have readelf or don't have an ELF object then we just don't enable the AVX2 optimization.
Reported-by: Stefan Weil <s...@weilnetz.de> Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> --- configure | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/configure b/configure index 7beefcd..30bca55 100755 --- a/configure +++ b/configure @@ -1792,8 +1792,10 @@ int foo(void *a) __attribute__((ifunc("bar_ifunc"))); int main(int argc, char *argv[]) { return foo(argv[0]);} EOF if compile_object "" ; then - if readelf --syms $TMPO |grep "IFUNC.*foo" >/dev/null 2>&1; then - avx2_opt="yes" + if has readelf; then + if readelf --syms $TMPO 2>/dev/null |grep -q "IFUNC.*foo"; then + avx2_opt="yes" + fi fi fi -- 2.6.2