build: rework SUN ld support

We _can_ support it, just without any symbol maps. (In other words,
we do not need to test for it specifically, just treat it as a
"everything else" case.)

Author: jengelh

Makefile.am

@@ -12,7 +12,9 @@ lib_LTLIBRARIES = libgromox_common.la libgromox_dbop.la libgromox_epoll.la libgr
 noinst_LTLIBRARIES = libgromox_abtree.la libphp_mapi.la
 pkglibexec_PROGRAMS = cgkrepair delivery delivery-queue event gromox-snapshot http imap midb pop3 timer zcore tools/authtry tools/eidprint tools/textmapquery
 pkglib_LTLIBRARIES = libmapi4zf.la
+if WITH_GNU_LD
 version_sc_SYFLAGS = -Wl,--version-script=${srcdir}/default.sym
+endif
 default_SYFLAGS = ${version_sc_SYFLAGS${NO_VSYM}}
 plugin_LDFLAGS = -avoid-version -module
 pamlibdir = ${libdir}/security

configure.ac

@@ -77,6 +77,7 @@ AS_IF([test -z "$NO_VSYM"], [
 	my_CFLAGS="$my_CFLAGS -fvisibility=hidden"
 	my_CXXFLAGS="$my_CXXFLAGS -fvisibility=hidden -fvisibility-inlines-hidden"
 ])
+AS_IF([test "$with_gnu_ld" != yes], [NO_VSYM=1])
 AC_SUBST([NO_VSYM])
 
 

tools/dldcheck.cpp

@@ -30,7 +30,15 @@ int main(int argc, char **argv)
 			fprintf(stderr, "dlopen %s: %s\n", file.c_str(), dlerror());
 			return EXIT_FAILURE;
 		}
+#if !defined(__sun)
+		/*
+		 * Crash on Solaris ld.so: It does not know STB_GNU_UNIQUE,
+		 * so libraries get unloaded even in the face of registered
+		 * global destructors.  That triggers a crash at the end of
+		 * main().
+		 */
 		dlclose(h);
+#endif
 	}
 	auto fd = open(stamp, O_CREAT | O_WRONLY | O_TRUNC, S_IRUGO | S_IWUGO);
 	if (fd < 0)