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* [gcc r14-9670] libstdc++: Add dg-require-cpp-feature-test to test feature test macros
@ 2024-03-26 11:43 Jonathan Wakely
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From: Jonathan Wakely @ 2024-03-26 11:43 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:4a3a1b6b75f921d35bbfef26619e7b5cece3fcf0
commit r14-9670-g4a3a1b6b75f921d35bbfef26619e7b5cece3fcf0
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Fri Mar 22 22:01:50 2024 +0000
libstdc++: Add dg-require-cpp-feature-test to test feature test macros
This adds a new dejagnu directive which can be used to make a test
depend on a feature test macro such as __cpp_lib_text_encoding. This is
mroe flexible than writing a new dg-require-xxx for each feature.
libstdc++-v3/ChangeLog:
* testsuite/lib/dg-options.exp (dg-require-cpp-feature-test):
New proc.
* testsuite/lib/libstdc++.exp (check_v3_target_cpp_feature_test):
New proc.
* testsuite/std/text_encoding/cons.cc: Use new directive to skip
the test if the __cpp_lib_text_encoding feature test macro is
not defined.
* testsuite/std/text_encoding/requirements.cc: Likewise.
Diff:
---
libstdc++-v3/testsuite/lib/dg-options.exp | 9 +++++++++
libstdc++-v3/testsuite/lib/libstdc++.exp | 15 +++++++++++++++
libstdc++-v3/testsuite/std/text_encoding/cons.cc | 1 +
libstdc++-v3/testsuite/std/text_encoding/requirements.cc | 1 +
4 files changed, 26 insertions(+)
diff --git a/libstdc++-v3/testsuite/lib/dg-options.exp b/libstdc++-v3/testsuite/lib/dg-options.exp
index 00ca678a53a..802bfc0b492 100644
--- a/libstdc++-v3/testsuite/lib/dg-options.exp
+++ b/libstdc++-v3/testsuite/lib/dg-options.exp
@@ -277,6 +277,15 @@ proc dg-require-target-fs-lwt { args } {
return
}
+proc dg-require-cpp-feature-test { n args } {
+ if { ![ check_v3_target_cpp_feature_test $args ] } {
+ upvar dg-do-what dg-do-what
+ set dg-do-what [list [lindex ${dg-do-what} 0] "N" "P"]
+ return
+ }
+ return
+}
+
proc add_options_for_no_pch { flags } {
# Remove any inclusion of bits/stdc++.h from the options.
regsub -all -- "-include bits/stdc...h" $flags "" flags
diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 7466fb51c58..2b31c950826 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -1134,6 +1134,21 @@ proc v3_check_preprocessor_condition { name cond { inc "" } } {
return [v3_try_preprocess name $code $flags]
}
+# Return 1 if libstdc++ defines macro for the current target, 0 otherwise.
+proc check_v3_target_cpp_feature_test { cond } {
+ global cxxflags
+ set cxxflags_saved $cxxflags
+ # Use the latest standard, so that all feature test macros are defined.
+ # We need to do it here, because this check happens before v3-dg-runtest
+ # runs its loop to test multiple times with different -std options.
+ # This should be updated when a new -std is added.
+ set cxxflags "$cxxflags -std=gnu++26"
+ set inc "#include <version>"
+ set result [v3_check_preprocessor_condition cpp_feature_test "$cond" $inc]
+ set cxxflags $cxxflags_saved
+ return $result
+}
+
# Return 1 if Debug Mode is active, 0 otherwise.
proc check_v3_target_debug_mode { } {
global cxxflags
diff --git a/libstdc++-v3/testsuite/std/text_encoding/cons.cc b/libstdc++-v3/testsuite/std/text_encoding/cons.cc
index 8fcc2ec8c3b..4196e32ea8b 100644
--- a/libstdc++-v3/testsuite/std/text_encoding/cons.cc
+++ b/libstdc++-v3/testsuite/std/text_encoding/cons.cc
@@ -1,4 +1,5 @@
// { dg-do run { target c++26 } }
+// { dg-require-cpp-feature-test "__cpp_lib_text_encoding" }
#include <text_encoding>
#include <string_view>
diff --git a/libstdc++-v3/testsuite/std/text_encoding/requirements.cc b/libstdc++-v3/testsuite/std/text_encoding/requirements.cc
index 6cd71b68225..3889b250688 100644
--- a/libstdc++-v3/testsuite/std/text_encoding/requirements.cc
+++ b/libstdc++-v3/testsuite/std/text_encoding/requirements.cc
@@ -1,4 +1,5 @@
// { dg-do compile { target c++26 } }
+// { dg-require-cpp-feature-test __cpp_lib_text_encoding }
// { dg-add-options no_pch }
#include <text_encoding>
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