[pacman-dev] [PATCH 4/4] Fix build error when SIGPOLL is not available

[Mark Weiman]

On Linux, SIGPOLL is a valid signal, but on systems like FreeBSD, it is
not. This patch adds a detection within meson.build to check if it's
available, and if not, make sure it's not included.

Signed-off-by: Mark Weiman <mark.weiman at markzz.com>
---
 lib/libalpm/util.c |  6 +++++-
 meson.build        | 13 +++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index d2a688a2..db07502a 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -561,7 +561,11 @@ static void _alpm_reset_signals(void)
 	int *i, signals[] = {
 		SIGABRT, SIGALRM, SIGBUS, SIGCHLD, SIGCONT, SIGFPE, SIGHUP, SIGILL,
 		SIGINT, SIGKILL, SIGPIPE, SIGQUIT, SIGSEGV, SIGSTOP, SIGTERM, SIGTSTP,
-		SIGTTIN, SIGTTOU, SIGUSR1, SIGUSR2, SIGPOLL, SIGPROF, SIGSYS, SIGTRAP,
+		SIGTTIN, SIGTTOU, SIGUSR1, SIGUSR2,
+#if defined(HAVE_SIGPOLL)
+        SIGPOLL,
+#endif
+        SIGPROF, SIGSYS, SIGTRAP,
 		SIGURG, SIGVTALRM, SIGXCPU, SIGXFSZ,
 		0
 	};
diff --git a/meson.build b/meson.build
index 0dc0d612..359e7f05 100644
--- a/meson.build
+++ b/meson.build
@@ -193,8 +193,21 @@ signal_code = '''void foo() { int sig = SIGINT; }'''
 signal_test = cc.compiles(signal_code, name : 'test if signal.h is not needed')
 if not signal_test
   conf.set('INCLUDE_SIGNAL_H', true)
+  include_signal = '''#include <signal.h>'''
+else
+  include_signal = ''
 endif
 
+foreach sig : [
+    'SIGPOLL',
+  ]
+  if cc.compiles(include_signal + '''
+                 void foo() { int sig = ''' +
+                sig + '''; }''', name : 'test for ' + sig)
+    conf.set('HAVE_' + sig, true)
+  endif
+endforeach
+
 if get_option('debug')
   extra_cflags = [
     '-Wcast-align',
-- 
2.31.1