fix: run stdout error tests only when stdout is mutable

4 files changed, 58 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index fb26a6c..981908a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,28 @@ AC_SUBST(COVERAGE_LDFLAGS)
 
 
 ###
+# detect whether HAVE_MUTABLE_STDOUT
+#
+
+
+AC_MSG_CHECKING("whether stdout is modifiable")
+AC_TRY_RUN(
+[
+    #include <stdio.h>
+    int main() { FILE *f = NULL; stdout = f; return stdout != NULL; }
+]
+, # if true
+[
+    AC_DEFINE([HAVE_MUTABLE_STDOUT], [1], [stdout is mutable])
+    AC_MSG_RESULT("yes")
+]
+, # if false
+[
+    AC_MSG_RESULT("no")
+])
+
+
+###
 # --enable-analyzer
 #
 
diff --git a/tst/rev-test.c b/tst/rev-test.c
index 8c0d1d7..652d285 100644
--- a/tst/rev-test.c
+++ b/tst/rev-test.c
@@ -843,6 +843,8 @@ static void rev_lib_invalid_arg(void)
    ========================================================================== */
 
 
+#if HAVE_MUTABLE_STDOUT
+
 static void rev_lib_stdout_error(void)
 {
     int   argc = 2;
@@ -866,11 +868,15 @@ static void rev_lib_stdout_error(void)
     mt_fail(strncmp(buf, "e/fputs()", 9) == 0);
 }
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
 
 /* ==========================================================================
    ========================================================================== */
 
 
+#if HAVE_MUTABLE_STDOUT
+
 static void rev_lib_stdout_error_no_nl(void)
 {
     int   argc = 2;
@@ -893,6 +899,8 @@ static void rev_lib_stdout_error_no_nl(void)
     unlink(REV_TEST_STDOUT);
 }
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
 
 /* ==========================================================================
                                               _
@@ -906,9 +914,13 @@ static void rev_lib_stdout_error_no_nl(void)
 
 int main(void)
 {
+#if HAVE_MUTABLE_STDOUT
+
     mt_run(rev_lib_stdout_error);
     mt_run(rev_lib_stdout_error_no_nl);
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
     mt_prepare_test = &prepare_test;
     mt_cleanup_test = &cleanup_test;
 
diff --git a/tst/seq-test.c b/tst/seq-test.c
index 4b44898..eec9a69 100644
--- a/tst/seq-test.c
+++ b/tst/seq-test.c
@@ -651,6 +651,8 @@ static void seq_print_version(void)
    ========================================================================== */
 
 
+#if HAVE_MUTABLE_STDOUT
+
 static void seq_stdout_error(void)
 {
     int    argc = 2;
@@ -670,6 +672,8 @@ static void seq_stdout_error(void)
     restore_stderr();
 }
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
 
 /* ==========================================================================
                                               _
@@ -683,8 +687,12 @@ static void seq_stdout_error(void)
 
 int main(void)
 {
+#if HAVE_MUTABLE_STDOUT
+
     mt_run(seq_stdout_error);
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
     mt_prepare_test = prepare_test;
     mt_cleanup_test = cleanup_test;
 
diff --git a/tst/std-redirects.c b/tst/std-redirects.c
index edd6e1d..bcfdb26 100644
--- a/tst/std-redirects.c
+++ b/tst/std-redirects.c
@@ -13,6 +13,9 @@
 
    ========================================================================== */
 
+#if HAVE_CONFIG_H
+#   include "config.h"
+#endif
 
 #include <errno.h>
 #include <stdio.h>
@@ -32,8 +35,13 @@
    ========================================================================== */
 
 
+#if HAVE_MUTABLE_STDOUT
+
 static FILE *stdout_save;
 static FILE *stdout_ro;
+
+#endif /* HAVE_MUTABLE_STDOUT */
+
 static int   fd_stdin = -1;
 static int   fd_stdout = -1;
 static int   fd_stderr = -1;
@@ -176,6 +184,8 @@ int stdout_to_file
    ========================================================================== */
 
 
+#if HAVE_MUTABLE_STDOUT
+
 int stdout_sabotage
 (
     const char *file
@@ -204,18 +214,24 @@ int stdout_sabotage
     return 0;
 }
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
 
 /* ==========================================================================
     Recover stdout from sabotage
    ========================================================================== */
 
 
+#if HAVE_MUTABLE_STDOUT
+
 void stdout_recover(void)
 {
     stdout = stdout_save;
     fclose(stdout_ro);
 }
 
+#endif /* HAVE_MUTABLE_STDOUT */
+
 
 /* ==========================================================================
     Redirects stderr to file