@@ -3531,19 +3531,6 @@ if compile_prog "" "" ; then
iovec=yes
fi
-##########################################
-# preadv probe
-cat > $TMPC <<EOF
-#include <sys/types.h>
-#include <sys/uio.h>
-#include <unistd.h>
-int main(void) { return preadv(0, 0, 0, 0); }
-EOF
-preadv=no
-if compile_prog "" "" ; then
- preadv=yes
-fi
-
##########################################
# fdt probe
@@ -5748,9 +5735,6 @@ fi
if test "$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
@@ -1128,6 +1128,8 @@ config_host_data.set('HAVE_PTY_H', cc.has_header('pty.h'))
config_host_data.set('HAVE_SYS_IOCCOM_H', cc.has_header('sys/ioccom.h'))
config_host_data.set('HAVE_SYS_KCOV_H', cc.has_header('sys/kcov.h'))
+config_host_data.set('CONFIG_PREADV', cc.has_function('preadv', prefix: '#include <sys/uio.h>'))
+
ignored = ['CONFIG_QEMU_INTERP_PREFIX'] # actually per-target
arrays = ['CONFIG_AUDIO_DRIVERS', 'CONFIG_BDRV_RW_WHITELIST', 'CONFIG_BDRV_RO_WHITELIST']
strings = ['HOST_DSOSUF', 'CONFIG_IASL']
@@ -2414,7 +2416,7 @@ summary_info += {'PIE': get_option('b_pie')}
summary_info += {'static build': config_host.has_key('CONFIG_STATIC')}
summary_info += {'malloc trim support': has_malloc_trim}
summary_info += {'membarrier': config_host.has_key('CONFIG_MEMBARRIER')}
-summary_info += {'preadv support': config_host.has_key('CONFIG_PREADV')}
+summary_info += {'preadv support': config_host_data.get('CONFIG_PREADV')}
summary_info += {'fdatasync': config_host.has_key('CONFIG_FDATASYNC')}
summary_info += {'madvise': config_host.has_key('CONFIG_MADVISE')}
summary_info += {'posix_madvise': config_host.has_key('CONFIG_POSIX_MADVISE')}
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 <peter.maydell@linaro.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20210126155846.17109-1-peter.maydell@linaro.org --- configure | 16 ---------------- meson.build | 4 +++- 2 files changed, 3 insertions(+), 17 deletions(-)