[gcc r15-10860] testsuite: Add tls_link effective target

[Torbjorn Svensson]

https://gcc.gnu.org/g:2aae96a8c727458f57865b68a862696c875bdfb7

commit r15-10860-g2aae96a8c727458f57865b68a862696c875bdfb7
Author: Christophe Lyon <christophe.lyon@linaro.org>
Date:   Thu Apr 17 15:55:14 2025 +0000

    testsuite: Add tls_link effective target
    
    Some tests have 'dg-do link' but currently require 'tls' which is a
    compile-only check.
    
    In some configurations of arm-none-eabi, the 'tls' effective-target
    can be successful although these tests fail to link with
    undefined reference to `__aeabi_read_tp'
    
    This patch as a new tls_link effective target which makes sure we can
    build an executable.
    
    gcc/testsuite/ChangeLog:
    
            * lib/target-supports.exp (check_effective_target_tls_link): New.
            * g++.dg/tls/pr102496-1.C: Require tls_link.
            * g++.dg/tls/pr77285-1.C: Likewise.
    
    gcc/ChangeLog:
    
            * doc/sourcebuild.texi (tls_link): Add documentation.
    
    (cherry picked from commit 8287861f7ca7418cd924ea2491c743c72ddb55dd)

Diff:
---
 gcc/doc/sourcebuild.texi              |  3 +++
 gcc/testsuite/g++.dg/tls/pr102496-1.C |  2 +-
 gcc/testsuite/g++.dg/tls/pr77285-1.C  |  2 +-
 gcc/testsuite/lib/target-supports.exp | 10 ++++++++++
 4 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index b509d49cb722..12f418bba10c 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -1975,6 +1975,9 @@ at plain @option{-O2}.
 @item tls
 Target supports thread-local storage.
 
+@item tls_link
+Target supports linking TLS executables.
+
 @item tls_native
 Target supports native (rather than emulated) thread-local storage.
 
diff --git a/gcc/testsuite/g++.dg/tls/pr102496-1.C b/gcc/testsuite/g++.dg/tls/pr102496-1.C
index 8220e1e663ac..e015ae95eab5 100644
--- a/gcc/testsuite/g++.dg/tls/pr102496-1.C
+++ b/gcc/testsuite/g++.dg/tls/pr102496-1.C
@@ -1,6 +1,6 @@
 // PR c++/102496
 // { dg-do link { target c++11 } }
-// { dg-require-effective-target tls }
+// { dg-require-effective-target tls_link }
 // { dg-add-options tls }
 // { dg-additional-sources pr102496-2.C }
 
diff --git a/gcc/testsuite/g++.dg/tls/pr77285-1.C b/gcc/testsuite/g++.dg/tls/pr77285-1.C
index 7a9341429d70..340c88be77bc 100644
--- a/gcc/testsuite/g++.dg/tls/pr77285-1.C
+++ b/gcc/testsuite/g++.dg/tls/pr77285-1.C
@@ -1,5 +1,5 @@
 // { dg-do link { target c++11 } }
-// { dg-require-effective-target tls }
+// { dg-require-effective-target tls_link }
 // { dg-add-options tls }
 // { dg-additional-sources pr77285-2.C }
 
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index bcd8fb5748bb..4aa50e1a1b5e 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -1051,6 +1051,16 @@ proc check_effective_target_tls {} {
     }]
 }
 
+# Return 1 if we can link using TLS, 0 otherwise.
+
+proc check_effective_target_tls_link {} {
+    return [check_no_compiler_messages tls_link executable {
+	__thread int i;
+	int main (void) { return i; }
+	void g (int j) { i = j; }
+    }]
+}
+
 # Return 1 if *native* thread local storage (TLS) is supported, 0 otherwise.
 
 proc check_effective_target_tls_native {} {