Re: pipe2 & configure script

[Paolo Bonzini <pbonzini@redhat.com>]

On 07/07/21 05:24, Richard Zak wrote:
> What conditions are required for "#define CONFIG_PIPE2" to be set in 
> build/config-host.h? It prevents building for Haiku as pipe2() doesn't 
> exist. I didn't see anything in the configure script regarding pipe2. I 
> also updated my code to the latest in the repository and this issue just 
> popped up.

Does this help?

diff --git a/meson.build b/meson.build
index 660e294b7e..32d5bd3685 100644
--- a/meson.build
+++ b/meson.build
@@ -1339,7 +1339,7 @@ config_host_data.set('HAVE_STRUCT_STAT_ST_ATIM',
  config_host_data.set('CONFIG_EVENTFD', cc.compiles('''
    #include <sys/eventfd.h>
    int main(void) { return eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); }'''))
-config_host_data.set('CONFIG_FDATASYNC', cc.compiles(gnu_source_prefix + '''
+config_host_data.set('CONFIG_FDATASYNC', cc.links(gnu_source_prefix + '''
    #include <unistd.h>
    int main(void) {
    #if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
@@ -1356,14 +1356,14 @@ config_host_data.set('CONFIG_MADVISE', cc.compiles(gnu_source_prefix + '''
  config_host_data.set('CONFIG_MEMFD', cc.compiles(gnu_source_prefix + '''
    #include <sys/mman.h>
    int main(void) { return memfd_create("foo", MFD_ALLOW_SEALING); }'''))
-config_host_data.set('CONFIG_OPEN_BY_HANDLE', cc.compiles(gnu_source_prefix + '''
+config_host_data.set('CONFIG_OPEN_BY_HANDLE', cc.links(gnu_source_prefix + '''
    #include <fcntl.h>
    #if !defined(AT_EMPTY_PATH)
    # error missing definition
    #else
    int main(void) { struct file_handle fh; return open_by_handle_at(0, &fh, 0); }
    #endif'''))
-config_host_data.set('CONFIG_PIPE2', cc.compiles(gnu_source_prefix + '''
+config_host_data.set('CONFIG_PIPE2', cc.links(gnu_source_prefix + '''
    #include <unistd.h>
    #include <fcntl.h>

?

Paolo