build-sys: introduce a special build flag to explicitly disables running from build tree

It is helpful to improve reproducibility build [1] since
PA_SRCDIR/PA_BUILDDIR contains build path,
--disable-running-from-build-tree could drop these macros at
precompilation.

[1] https://reproducible-builds.org/

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>

configure.ac

@@ -989,6 +989,16 @@ AS_IF([test "x$enable_asyncns" = "xyes" && test "x$HAVE_LIBASYNCNS" = "x0"],
 AM_CONDITIONAL([HAVE_LIBASYNCNS], [test "x$HAVE_LIBASYNCNS" = x1])
 AS_IF([test "x$HAVE_LIBASYNCNS" = "x1"], AC_DEFINE([HAVE_LIBASYNCNS], 1, [Have libasyncns?]))
 
+#### Running from build tree (optional) ####
+
+AC_ARG_ENABLE([running-from-build-tree],
+    AS_HELP_STRING([--disable-running-from-build-tree],[Disable running from build tree]))
+
+AS_IF([test "x$enable_running_from_build_tree" != "xno"],
+      AC_DEFINE([HAVE_RUNNING_FROM_BUILD_TREE], 1, [Have running from build tree]))
+
+AC_SUBST(HAVE_RUNNING_FROM_BUILD_TREE)
+
 #### TCP wrappers (optional) ####
 
 AC_ARG_ENABLE([tcpwrap],

src/daemon/daemon-conf.c

@@ -155,16 +155,18 @@ pa_daemon_conf *pa_daemon_conf_new(void) {
     c->dl_search_path = pa_sprintf_malloc("%s" PA_PATH_SEP "lib" PA_PATH_SEP "pulse-%d.%d" PA_PATH_SEP "modules",
                                           pa_win32_get_toplevel(NULL), PA_MAJOR, PA_MINOR);
 #else
+#ifdef HAVE_RUNNING_FROM_BUILD_TREE
     if (pa_run_from_build_tree()) {
         pa_log_notice("Detected that we are run from the build tree, fixing search path.");
 #ifdef MESON_BUILD
         c->dl_search_path = pa_xstrdup(PA_BUILDDIR PA_PATH_SEP "src" PA_PATH_SEP "modules");
 #else
         c->dl_search_path = pa_xstrdup(PA_BUILDDIR);
-#endif
+#endif // Endof #ifdef MESON_BUILD
     } else
+#endif // Endof #ifdef HAVE_RUNNING_FROM_BUILD_TREE
         c->dl_search_path = pa_xstrdup(PA_DLSEARCHPATH);
-#endif
+#endif // Endof #ifdef OS_IS_WIN32
 
     return c;
 }

src/daemon/main.c

@@ -941,6 +941,12 @@ int main(int argc, char *argv[]) {
 
     pa_log_debug("Running in VM: %s", pa_yes_no(pa_running_in_vm()));
 
+#ifdef HAVE_RUNNING_FROM_BUILD_TREE
+    pa_log_debug("Running from build tree: %s", pa_yes_no(pa_run_from_build_tree()));
+#else
+    pa_log_debug("Running from build tree: no");
+#endif
+
 #ifdef __OPTIMIZE__
     pa_log_debug("Optimized build: yes");
 #else

src/modules/alsa/alsa-mixer.c

@@ -2573,9 +2573,11 @@ static int path_verify(pa_alsa_path *p) {
 }
 
 static const char *get_default_paths_dir(void) {
+#ifdef HAVE_RUNNING_FROM_BUILD_TREE
     if (pa_run_from_build_tree())
         return PA_SRCDIR "/modules/alsa/mixer/paths/";
     else
+#endif
         return PA_ALSA_PATHS_DIR;
 }
 
@@ -4458,7 +4460,9 @@ pa_alsa_profile_set* pa_alsa_profile_set_new(const char *fname, const pa_channel
         fname = "default.conf";
 
     fn = pa_maybe_prefix_path(fname,
+#ifdef HAVE_RUNNING_FROM_BUILD_TREE
                               pa_run_from_build_tree() ? PA_SRCDIR "/modules/alsa/mixer/profile-sets/" :
+#endif
                               PA_ALSA_PROFILE_SETS_DIR);
 
     r = pa_config_parse(fn, NULL, items, NULL, false, ps);

src/modules/gconf/module-gconf.c

@@ -51,7 +51,7 @@ int pa__init(pa_module*m) {
     u->buf_fill = 0;
 
     if ((u->fd = pa_start_child_for_read(
-#if defined(__linux__) && !defined(__OPTIMIZE__)
+#if defined(__linux__) && defined(HAVE_RUNNING_FROM_BUILD_TREE)
                               pa_run_from_build_tree() ? PA_BUILDDIR "/gconf-helper" :
 #endif
                  PA_GCONF_HELPER, NULL, &u->pid)) < 0)

src/modules/gsettings/module-gsettings.c

@@ -51,7 +51,7 @@ int pa__init(pa_module*m) {
     u->buf_fill = 0;
 
     if ((u->fd = pa_start_child_for_read(
-#if defined(__linux__) && !defined(__OPTIMIZE__)
+#if defined(__linux__) && defined(HAVE_RUNNING_FROM_BUILD_TREE)
                               pa_run_from_build_tree() ? PA_BUILDDIR "/gsettings-helper" :
 #endif
                  PA_GSETTINGS_HELPER, NULL, &u->pid)) < 0)

src/pulsecore/core-util.c

@@ -3269,15 +3269,17 @@ void pa_reset_personality(void) {
 }
 
 bool pa_run_from_build_tree(void) {
-    char *rp;
     static bool b = false;
 
+#ifdef HAVE_RUNNING_FROM_BUILD_TREE
+    char *rp;
     PA_ONCE_BEGIN {
         if ((rp = pa_readlink("/proc/self/exe"))) {
             b = pa_startswith(rp, PA_BUILDDIR);
             pa_xfree(rp);
         }
     } PA_ONCE_END;
+#endif
 
     return b;
 }