https://gcc.gnu.org/g:57b706d141b87c06dfbba577048a1e4903d33f70

commit r15-7152-g57b706d141b87c06dfbba577048a1e4903d33f70
Author: Torbjörn SVENSSON <torbjorn.svens...@foss.st.com>
Date:   Sun Jan 19 18:33:24 2025 +0100

    testsuite: Only run test if alarm is available
    
    Most baremetal toolchains will not have an implementation for alarm and
    sigaction as they are target specific.
    For arm-none-eabi with newlib, function signatures are exposed, but
    there is no implmentation and thus the test cases causes a undefined
    symbol link error.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/pr78185.c: Remove dg-do and replace with
            with dg-require-effective-target of signal and alarm.
            * gcc.dg/pr116906-1.c: Likewise.
            * gcc.dg/pr116906-2.c: Likewise.
            * gcc.dg/vect/pr101145inf.c: Use effective-target alarm.
            * gcc.dg/vect/pr101145inf_1.c: Likewise.
            * lib/target-supports.exp(check_effective_target_alarm): New.
    
    gcc/ChangeLog:
    
            * doc/sourcebuild.texi (Effective-Target Keywords): Document
            'alarm'.
    
    Signed-off-by: Torbjörn SVENSSON <torbjorn.svens...@foss.st.com>

Diff:
---
 gcc/doc/sourcebuild.texi                  |  3 +++
 gcc/testsuite/gcc.dg/pr116906-1.c         |  3 ++-
 gcc/testsuite/gcc.dg/pr116906-2.c         |  3 ++-
 gcc/testsuite/gcc.dg/pr78185.c            |  3 ++-
 gcc/testsuite/gcc.dg/vect/pr101145inf.c   |  1 +
 gcc/testsuite/gcc.dg/vect/pr101145inf_1.c |  1 +
 gcc/testsuite/lib/target-supports.exp     | 27 +++++++++++++++++++++++++++
 7 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index b5c1b23e5271..98ede70f23c0 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -2808,6 +2808,9 @@ both scalar and vector modes.
 @subsubsection Environment attributes
 
 @table @code
+@item alarm
+Target supports @code{alarm}.
+
 @item c
 The language for the compiler under test is C.
 
diff --git a/gcc/testsuite/gcc.dg/pr116906-1.c 
b/gcc/testsuite/gcc.dg/pr116906-1.c
index 27b1fdae02bf..7187507a60d1 100644
--- a/gcc/testsuite/gcc.dg/pr116906-1.c
+++ b/gcc/testsuite/gcc.dg/pr116906-1.c
@@ -1,4 +1,5 @@
-/* { dg-do run { target *-*-linux* *-*-gnu* *-*-uclinux* } } */
+/* { dg-require-effective-target alarm } */
+/* { dg-require-effective-target signal } */
 /* { dg-options "-O2" } */
 
 #include <stdint.h>
diff --git a/gcc/testsuite/gcc.dg/pr116906-2.c 
b/gcc/testsuite/gcc.dg/pr116906-2.c
index 3478771678ce..41a352bf8370 100644
--- a/gcc/testsuite/gcc.dg/pr116906-2.c
+++ b/gcc/testsuite/gcc.dg/pr116906-2.c
@@ -1,4 +1,5 @@
-/* { dg-do run { target *-*-linux* *-*-gnu* *-*-uclinux* } } */
+/* { dg-require-effective-target alarm } */
+/* { dg-require-effective-target signal } */
 /* { dg-options "-O2 -fno-tree-ch" } */
 
 #include <unistd.h>
diff --git a/gcc/testsuite/gcc.dg/pr78185.c b/gcc/testsuite/gcc.dg/pr78185.c
index d7781b2080fb..ada8b1b9f907 100644
--- a/gcc/testsuite/gcc.dg/pr78185.c
+++ b/gcc/testsuite/gcc.dg/pr78185.c
@@ -1,4 +1,5 @@
-/* { dg-do run { target *-*-linux* *-*-gnu* *-*-uclinux* } } */
+/* { dg-require-effective-target alarm } */
+/* { dg-require-effective-target signal } */
 /* { dg-options "-O" } */
 
 #include <unistd.h>
diff --git a/gcc/testsuite/gcc.dg/vect/pr101145inf.c 
b/gcc/testsuite/gcc.dg/vect/pr101145inf.c
index aa598875aa59..70aea94b6e0b 100644
--- a/gcc/testsuite/gcc.dg/vect/pr101145inf.c
+++ b/gcc/testsuite/gcc.dg/vect/pr101145inf.c
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target alarm } */
 /* { dg-require-effective-target signal } */
 /* { dg-additional-options "-O3" } */
 #include <limits.h>
diff --git a/gcc/testsuite/gcc.dg/vect/pr101145inf_1.c 
b/gcc/testsuite/gcc.dg/vect/pr101145inf_1.c
index 0465788c3cca..fe008284e1d9 100644
--- a/gcc/testsuite/gcc.dg/vect/pr101145inf_1.c
+++ b/gcc/testsuite/gcc.dg/vect/pr101145inf_1.c
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target alarm } */
 /* { dg-require-effective-target signal } */
 /* { dg-additional-options "-O3" } */
 #include <limits.h>
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 1785a9d61500..9ad1e1965bbd 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -14271,3 +14271,30 @@ proc add_options_for_nvptx_alloca_ptx { flags } {
 
     return $flags
 }
+
+# Return true if alarm is supported on the target.
+
+proc check_effective_target_alarm { } {
+    if { ![check_effective_target_signal] } {
+       return 0
+    }
+
+    return [check_no_compiler_messages alarm executable {
+       #include <signal.h>
+       #include <stdlib.h>
+       #include <unistd.h>
+       void do_exit(int i) { exit (0); }
+       int main (void) { 
+         struct sigaction s;
+         sigemptyset (&s.sa_mask);
+         s.sa_handler = exit;
+         s.sa_flags = 0;
+         sigaction (SIGALRM, &s, NULL);
+         alarm (1);
+
+         /* Infinite loop to simulate work...  */
+         while (1);
+         abort ();
+       }
+    }]
+}

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