From 2b9f74efcc0f5db6ddd133560cfe063fe891fde1 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 26 Jan 2021 15:58:46 +0000 Subject: configure: Move preadv check to meson.build Move the preadv availability check to meson.build. This is what we want to be doing for host-OS-feature-checks anyway, but it also fixes a problem with building for macOS with the most recent XCode SDK on a Catalina host. On that configuration, 'preadv()' is provided as a weak symbol, so that programs can be built with optional support for it and make a runtime availability check to see whether the preadv() they have is a working one or one which they must not call because it will runtime-assert. QEMU's configure test passes (unless you're building with --enable-werror) because the test program using preadv() compiles, but then QEMU crashes at runtime when preadv() is called, with errors like: dyld: lazy symbol binding failed: Symbol not found: _preadv Referenced from: /Users/pm215/src/qemu/./build/x86/tests/test-replication Expected in: /usr/lib/libSystem.B.dylib dyld: Symbol not found: _preadv Referenced from: /Users/pm215/src/qemu/./build/x86/tests/test-replication Expected in: /usr/lib/libSystem.B.dylib Meson's own function availability check has a special case for macOS which adds '-Wl,-no_weak_imports' to the compiler flags, which forces the test to require the real function, not the macOS-version-too-old stub. So this commit fixes the bug where macOS builds on Catalina currently require --disable-werror. Signed-off-by: Peter Maydell Acked-by: Paolo Bonzini Reviewed-by: Philippe Mathieu-Daudé Message-id: 20210126155846.17109-1-peter.maydell@linaro.org --- configure | 16 ---------------- 1 file changed, 16 deletions(-) (limited to 'configure') diff --git a/configure b/configure index 87de49e2c2..8549c7b5eb 100755 --- a/configure +++ b/configure @@ -3531,19 +3531,6 @@ if compile_prog "" "" ; then iovec=yes fi -########################################## -# preadv probe -cat > $TMPC < -#include -#include -int main(void) { return preadv(0, 0, 0, 0); } -EOF -preadv=no -if compile_prog "" "" ; then - preadv=yes -fi - ########################################## # fdt probe @@ -5748,9 +5735,6 @@ fi if test "$iovec" = "yes" ; then echo "CONFIG_IOVEC=y" >> $config_host_mak fi -if test "$preadv" = "yes" ; then - echo "CONFIG_PREADV=y" >> $config_host_mak -fi if test "$membarrier" = "yes" ; then echo "CONFIG_MEMBARRIER=y" >> $config_host_mak fi -- cgit v1.2.3-55-g7522