Fix part of #1128 by adding a way to retrieve PD search paths

As this uses g_slist_copy_deep(), we now require glib 2.34.

Author: abraxa

README

@@ -34,7 +34,7 @@ Requirements
  - automake >= 1.11 (only needed when building from git)
  - libtool (only needed when building from git)
  - pkg-config >= 0.22
- - libglib >= 2.28.0
+ - libglib >= 2.34
  - Python >= 3.2
  - check >= 0.9.4 (optional, only needed to run unit tests)
  - doxygen (optional, only needed for the C API docs)

configure.ac

@@ -137,7 +137,7 @@ AC_SUBST([SRD_PKGLIBS])
 
 # Retrieve the compile and link flags for all modules combined.
 # Also, bail out at this point if any module dependency is not met.
-PKG_CHECK_MODULES([LIBSIGROKDECODE], [glib-2.0 >= 2.28.0 $SRD_PKGLIBS])
+PKG_CHECK_MODULES([LIBSIGROKDECODE], [glib-2.0 >= 2.34 $SRD_PKGLIBS])
 PKG_CHECK_MODULES([TESTS], [$SRD_PKGLIBS_TESTS glib-2.0 $SRD_PKGLIBS])
 
 srd_glib_version=`$PKG_CONFIG --modversion glib-2.0 2>&AS_MESSAGE_LOG_FD`
@@ -168,7 +168,7 @@ Compile configuration:
  - Linker flags.................... $LDFLAGS
 
 Detected libraries (required):
- - glib-2.0 >= 2.28.0.............. $srd_glib_version
+ - glib-2.0 >= 2.34................ $srd_glib_version
 $srd_pkglibs_summary
 Detected libraries (optional):
 $srd_pkglibs_opt_summary

libsigrokdecode.h

@@ -320,6 +320,7 @@ struct srd_pd_callback {
 /* srd.c */
 SRD_API int srd_init(const char *path);
 SRD_API int srd_exit(void);
+SRD_API GSList *srd_searchpaths_get(void);
 
 /* session.c */
 SRD_API int srd_session_new(struct srd_session **sess);

srd.c

@@ -179,6 +179,11 @@ static int print_searchpaths(void)
 	return SRD_ERR_PYTHON;
 }
 
+SRD_API GSList *srd_searchpaths_get(void)
+{
+	return g_slist_copy_deep(searchpaths, (GCopyFunc)g_strdup, NULL);
+}
+
 /**
  * Initialize libsigrokdecode.
  *