introduce target fileio and require it in tests that use tmpnam

Some target C libraries that aren't recognized as freestanding don't
have filesystem support, so calling tmpnam, fopen/open and
remove/unlink fails to link.

This patch introduces a fileio effective target to the testsuite, and
requires it in the tests that call tmpnam.


for  gcc/testsuite/ChangeLog

	* lib/target-supports.exp (check_effective_target_fileio): New.
	* gcc.c-torture/execute/fprintf-2.c: Require it.
	* gcc.c-torture/execute/printf-2.c: Likewise.
	* gcc.c-torture/execute/user-printf.c: Likewise.

5 files changed, 23 insertions, 0 deletions

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 4b1e9e1..e6b8812 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2020-04-24  Alexandre Oliva <oliva@adacore.com>
+
+	* lib/target-supports.exp (check_effective_target_fileio): New.
+	* gcc.c-torture/execute/fprintf-2.c: Require it.
+	* gcc.c-torture/execute/printf-2.c: Likewise.
+	* gcc.c-torture/execute/user-printf.c: Likewise.
+
 2020-04-24  Haijian Zhang <z.zhanghaijian@huawei.com>
 
 	PR rtl-optimization/94708
diff --git a/gcc/testsuite/gcc.c-torture/execute/fprintf-2.c b/gcc/testsuite/gcc.c-torture/execute/fprintf-2.c
index c723867..d8e19e7 100644
--- a/gcc/testsuite/gcc.c-torture/execute/fprintf-2.c
+++ b/gcc/testsuite/gcc.c-torture/execute/fprintf-2.c
@@ -1,6 +1,7 @@
 /* Verify that calls to fprintf don't get eliminated even if their
    result on success can be computed at compile time (they can fail).
    The calls can still be transformed into those of other functions.
+   { dg-require-effective-target fileio }
    { dg-prune-output "warning: warning: \[^\n\r\]* possibly used unsafely" }
    { dg-skip-if "requires io" { avr-*-* } }
    { dg-skip-if "requires io" { freestanding } } */
diff --git a/gcc/testsuite/gcc.c-torture/execute/printf-2.c b/gcc/testsuite/gcc.c-torture/execute/printf-2.c
index 57f467e..4e7d8f7 100644
--- a/gcc/testsuite/gcc.c-torture/execute/printf-2.c
+++ b/gcc/testsuite/gcc.c-torture/execute/printf-2.c
@@ -2,6 +2,7 @@
    result on success can be computed at compile time (they can fail).
    The calls can still be transformed into those of other functions.
    { dg-require-effective-target unwrapped }
+   { dg-require-effective-target fileio }
    { dg-prune-output "warning: warning: \[^\n\r\]* possibly used unsafely" }
    { dg-skip-if "requires io" { avr-*-* } }
    { dg-skip-if "requires io" { freestanding } } */
diff --git a/gcc/testsuite/gcc.c-torture/execute/user-printf.c b/gcc/testsuite/gcc.c-torture/execute/user-printf.c
index 006d99e..42a3b17 100644
--- a/gcc/testsuite/gcc.c-torture/execute/user-printf.c
+++ b/gcc/testsuite/gcc.c-torture/execute/user-printf.c
@@ -2,6 +2,7 @@
    don't get eliminated even if their result on success can be computed at
    compile time (they can fail).
    { dg-require-effective-target unwrapped }
+   { dg-require-effective-target fileio }
    { dg-prune-output "warning: warning: \[^\n\r\]* possibly used unsafely" }
    { dg-skip-if "requires io" { avr-*-* } }
    { dg-skip-if "requires io" { freestanding } } */
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index a667ddf..008def6 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -751,6 +751,19 @@ proc check_effective_target_freestanding { } {
     return 0
 }
 
+# Check to see that file I/O functions are available.
+proc check_effective_target_fileio { } {
+    return [check_no_compiler_messages fileio_available executable {
+#include <stdio.h>
+int main() {
+    char *n = tmpnam (NULL);
+    FILE *f = fopen (n, "w");
+    fclose (f);
+    remove (n);
+    return 0;
+} } ""]
+}
+
 # Return 1 if target has packed layout of structure members by
 # default, 0 otherwise.  Note that this is slightly different than
 # whether the target has "natural alignment": both attributes may be