Add 2038 test during build -- make check will fail is there is a 2038 problem

https://github.com/Hamlib/Hamlib/issues/1478

tests/Makefile.am

@@ -17,7 +17,7 @@ DISTCLEANFILES = rigctl.log rigctl.sum testbcd.log testbcd.sum
 bin_PROGRAMS = rigctl rigctld rigmem rigsmtr rigswr rotctl rotctld rigctlcom rigctltcp rigctlsync ampctl ampctld rigtestmcast rigtestmcastrx $(TESTLIBUSB) rigfreqwalk
 
 #check_PROGRAMS = dumpmem testrig testrigopen testrigcaps testtrn testbcd testfreq listrigs testloc rig_bench testcache cachetest cachetest2 testcookie testgrid testsecurity
-check_PROGRAMS = dumpmem testrig testrigopen testrigcaps testtrn testbcd testfreq listrigs testloc rig_bench testcache cachetest cachetest2 testcookie testgrid hamlibmodels testmW2power
+check_PROGRAMS = dumpmem testrig testrigopen testrigcaps testtrn testbcd testfreq listrigs testloc rig_bench testcache cachetest cachetest2 testcookie testgrid hamlibmodels testmW2power test2038
 
 RIGCOMMONSRC = rigctl_parse.c rigctl_parse.h dumpcaps.c dumpstate.c uthash.h rig_tests.c rig_tests.h dumpcaps.h
 ROTCOMMONSRC = rotctl_parse.c rotctl_parse.h dumpcaps_rot.c uthash.h dumpcaps_rot.h
@@ -106,7 +106,7 @@ endif
 EXTRA_DIST = rigmatrix_head.html rig_split_lst.awk testctld.pl testrotctld.pl
 
 # Support 'make check' target for simple tests
-check_SCRIPTS = testrig.sh testfreq.sh testbcd.sh testloc.sh testrigcaps.sh testcache.sh testcookie.sh testgrid.sh
+check_SCRIPTS = testrig.sh testfreq.sh testbcd.sh testloc.sh testrigcaps.sh testcache.sh testcookie.sh testgrid.sh test2038.sh
 
 TESTS = $(check_SCRIPTS)
 
@@ -143,4 +143,8 @@ testgrid.sh:
 	echo './testgrid' > testgrid.sh
 	chmod +x ./testgrid.sh
 
+test2038.sh:
+	echo 'LD_LIBRARY_PATH=$(top_builddir)/src/.libs:$(top_builddir)/dummy/.libs ./test2038 1' > test2038.sh
+	chmod +x ./test2038.sh
+
 CLEANFILES = testrig.sh testfreq.sh testbcd.sh testloc.sh testrigcaps.sh testcache.sh testcookie.sh rigtestlibusb build-w32.sh build-w64.sh build-w64-jtsdk.sh testgrid.sh testrigcaps.sh

tests/test2038.c

@@ -0,0 +1,33 @@
+/* 2038 test
+This is OK on 64-bit systems and mingw64
+Does fail when compiled with gcc -m32 -o 2038 2038.c
+*/
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+
+int main(void)
+{
+    time_t x;
+
+    x = (time_t)((1U << 31) - 1);
+    char *s = ctime(&x);
+
+    //printf("%s", s);
+    if (!strstr(s, "2038")) { return 1; }
+
+    x += 1;
+    s = ctime(&x);
+
+    if (!strstr(s, "2038")) { return 1; }
+
+    //printf("%s", s);
+    x += 1;
+    s = ctime(&x);
+
+    if (!strstr(s, "2038")) { return 1; }
+
+    //printf("%s", s);
+
+    return 0;
+}