While detecting a presence of a function via 'cc.links()' gives desired result (i.e. detects whether function is present), it also produces a warning on systems where the function is not present, e.g.:
qemu.git/build/meson-private/tmph74x3p38/testfile.c:2:34: \ warning: implicit declaration of function 'malloc_trim' [-Wimplicit-function-declaration] We can check whether given function exists via 'cc.has_function()' firstly. Resolves: https://bugs.gentoo.org/898810 Signed-off-by: Michal Privoznik <mpriv...@redhat.com> --- meson.build | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/meson.build b/meson.build index 2d48aa1e2e..5da4dbac24 100644 --- a/meson.build +++ b/meson.build @@ -1797,6 +1797,7 @@ malloc = [] if get_option('malloc') == 'system' has_malloc_trim = \ get_option('malloc_trim').allowed() and \ + cc.has_function('malloc_trim', prefix: '#include <malloc.h>') and \ cc.links('''#include <malloc.h> int main(void) { malloc_trim(0); return 0; }''') else @@ -1818,27 +1819,29 @@ gnu_source_prefix = ''' #define _GNU_SOURCE #endif ''' -statx_test = gnu_source_prefix + ''' - #include <sys/stat.h> +statx_prefix = gnu_source_prefix + ''' + #include<sys/stat.h> +''' +statx_test = statx_prefix + ''' int main(void) { struct statx statxbuf; statx(0, "", 0, STATX_BASIC_STATS, &statxbuf); return 0; }''' -has_statx = cc.links(statx_test) +has_statx = cc.has_function('statx', prefix: statx_prefix) and \ + cc.links(statx_test) # Check whether statx() provides mount ID information -statx_mnt_id_test = gnu_source_prefix + ''' - #include <sys/stat.h> +statx_mnt_id_test = statx_prefix + ''' int main(void) { struct statx statxbuf; statx(0, "", 0, STATX_BASIC_STATS | STATX_MNT_ID, &statxbuf); return statxbuf.stx_mnt_id; }''' -has_statx_mnt_id = cc.links(statx_mnt_id_test) +has_statx_mnt_id = has_statx and cc.links(statx_mnt_id_test) have_vhost_user_blk_server = get_option('vhost_user_blk_server') \ .require(targetos == 'linux', -- 2.39.3
