* configure (config_flags): New variable, allowing us to

have stricter diagnosis for configure tests.
(have_timegm, need_svid_source, need_bsd_source): New
variables.  sys/stat.h test only declares static data and
compiles an object file. Adding tests for timegm, tzset,
setenv and unsetenv.

* eval.c (eval_init): Register new intrinsic, make_time_utc.

* lib.c (make_time_impl): New static function.
(make_time): Reimplemented as call to make_time_impl.
(timegm_hack): New conditionally-defined static function.
(make_time_utc): New function.

* lib.h (make_time_utc): Declared.

* txr.1: make-time-utc documented.

1 files changed, 78 insertions, 8 deletions

diff --git a/configure b/configure
index e318ef17..51e067a9 100755
--- a/configure
+++ b/configure
@@ -84,6 +84,7 @@ opt_flags=-O2
 lang_flags='-ansi -D_XOPEN_SOURCE=2'
 diag_flags='-Wall -Wmissing-prototypes -Wstrict-prototypes'
 debug_flags=-g
+config_flags=' -Werror' # special: used only during configure
 inline=
 platform_flags=
 remove_flags=
@@ -98,6 +99,9 @@ mpi_version=1.8.6
 have_quilt=
 have_patch=
 have_unistd=
+have_timegm=
+need_svid_source=
+need_bsd_source=
 
 #
 # Parse configuration variables
@@ -583,7 +587,7 @@ NM := $nm
 
 OPT_FLAGS := $opt_flags
 LANG_FLAGS := $lang_flags
-DIAG_FLAGS := $diag_flags
+DIAG_FLAGS := $diag_flags$config_flags
 DBG_FLAGS := $debug_flags
 PLATFORM_FLAGS := $platform_flags
 REMOVE_FLAGS := $remove_flags
@@ -1152,14 +1156,10 @@ printf "Checking whether we have <sys/stat.h> ... "
 cat > conftest.c <<!
 #include <sys/stat.h>
 
-int main(void)
-{
-  struct stat s;
-  return 0;
-}
+struct stat s;
 !
 rm -f conftest
-if ! $make conftest > conftest.err 2>&1 || ! [ -x conftest ] ; then
+if ! $make conftest.o > conftest.err 2>&1; then
   printf "no\n"
 else
   printf "yes\n"
@@ -1250,7 +1250,7 @@ fi
 # Check for fields inside struct tm
 #
 
-printf "Printf detecting timezone fields in struct tm ..."
+printf "Printf detecting timezone fields in struct tm ... "
 
 tm_gmtoff=
 tm_tmzone=
@@ -1283,6 +1283,69 @@ done
 
 printf "done\n"
 
+printf "Checking for timegm function ... "
+
+cat > conftest.c <<!
+#include <time.h>
+
+int main(void)
+{
+  struct tm tms = { 0 };
+  timegm(&tms);
+  return 0;
+}
+!
+rm -f conftest
+if ! $make EXTRA_FLAGS='-D_SVID_SOURCE' conftest > conftest.err 2>&1 || ! [ -x conftest ] ; then
+  printf "no\n"
+else
+  printf "yes\n"
+  printf "#define HAVE_TIMEGM 1\n" >> config.h
+  have_timegm=y
+  need_svid_source=y
+fi
+
+if [ -z "$have_timegm" ] ; then
+  printf "Checking for setenv and unsetenv functions ... "
+
+  cat > conftest.c <<!
+#include <stdlib.h>
+
+int main(void)
+{
+  setenv("TERM", "foo", 1);
+  unsetenv("TERM");
+  return 0;
+}
+!
+  rm -f conftest
+  if ! $make EXTRA_FLAGS='-D_BSD_SOURCE' conftest > conftest.err 2>&1 || ! [ -x conftest ] ; then
+    printf "no\n"
+  else
+    printf "yes\n"
+    printf "#define HAVE_SETENV 1\n" >> config.h
+    need_bsd_source=y
+  fi
+fi
+printf "Checking for tzset function ... "
+
+cat > conftest.c <<!
+#include <time.h>
+
+int main(void)
+{
+  tzset();
+  return 0;
+}
+!
+rm -f conftest
+if ! $make conftest > conftest.err 2>&1 || ! [ -x conftest ] ; then
+  printf "no\n"
+else
+  printf "yes\n"
+  printf "#define HAVE_TZSET 1\n" >> config.h
+fi
+
 printf "Checking for POSIX sleep function ... "
 
 cat > conftest.c <<!
@@ -1423,6 +1486,13 @@ fi
 #
 
 printf "Regenerating config.make ... "
+config_flags=
+if [ -n "$need_svid_source" ] ; then
+  lang_flags="$lang_flags -D_SVID_SOURCE"
+fi
+if [ -n "$need_bsd_source" ] ; then
+  lang_flags="$lang_flags -D_BSD_SOURCE"
+fi
 gen_config_make
 printf "done\n"