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>
---
configure | 16 ----------------
meson.build | 4 +++-
2 files changed, 3 insertions(+), 17 deletions(-)
diff --git a/configure b/configure
index dcc5ea7d630..0e672c3e291 100755
--- a/configure
+++ b/configure
@@ -3525,19 +3525,6 @@ if compile_prog "" "" ; then
iovec=yes
fi
-##########################################
-# preadv probe
-cat > $TMPC <<EOF
-#include <sys/types.h>
-#include <sys/uio.h>
-#include <unistd.h>
-int main(void) { return preadv(0, 0, 0, 0); }
-EOF
-preadv=no
-if compile_prog "" "" ; then
- preadv=yes
-fi
-
##########################################
# fdt probe
@@ -5742,9 +5729,6 @@ fi
if test "$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
diff --git a/meson.build b/meson.build
index 35a9eddf5cf..c4a66d87793 100644
--- a/meson.build
+++ b/meson.build
@@ -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']
@@ -2411,7 +2413,7 @@ 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')}
--
2.20.1
On 26/01/21 16:58, Peter Maydell wrote: > 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> > --- > configure | 16 ---------------- > meson.build | 4 +++- > 2 files changed, 3 insertions(+), 17 deletions(-) > > diff --git a/configure b/configure > index dcc5ea7d630..0e672c3e291 100755 > --- a/configure > +++ b/configure > @@ -3525,19 +3525,6 @@ if compile_prog "" "" ; then > iovec=yes > fi > > -########################################## > -# preadv probe > -cat > $TMPC <<EOF > -#include <sys/types.h> > -#include <sys/uio.h> > -#include <unistd.h> > -int main(void) { return preadv(0, 0, 0, 0); } > -EOF > -preadv=no > -if compile_prog "" "" ; then > - preadv=yes > -fi > - > ########################################## > # fdt probe > > @@ -5742,9 +5729,6 @@ fi > if test "$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 > diff --git a/meson.build b/meson.build > index 35a9eddf5cf..c4a66d87793 100644 > --- a/meson.build > +++ b/meson.build > @@ -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'] > @@ -2411,7 +2413,7 @@ 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')} > Acked-by: Paolo Bonzini <pbonzini@redhat.com> Thanks, Paolo
On 1/26/21 4:58 PM, Peter Maydell wrote: > 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> > --- > configure | 16 ---------------- > meson.build | 4 +++- > 2 files changed, 3 insertions(+), 17 deletions(-) Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
On Wed, 27 Jan 2021 at 21:49, Philippe Mathieu-Daudé <philmd@redhat.com> wrote: > > On 1/26/21 4:58 PM, Peter Maydell wrote: > > 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. > Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Thanks; I'll take this via target-arm.next just for convenience's sake. -- PMM
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