On 31/10/24 20:09 +0000, Jonathan Wakely wrote:
Tested x86_64-linux. Is the g++ test change OK?
Also available for review at:
https://forge.sourceware.org/gcc/gcc-TEST/pulls/4
-- >8 --
These headers make no sense for C++ programs, because they either define
different content to the corresponding <xxx.h> C header, or define
nothing at all in namespace std. They were all deprecated in C++17, so
add deprecation warnings to them, which can be disabled with
-Wno-deprecated. For C++20 and later these headers are no longer in the
standard at all, so compiling with _GLIBCXX_USE_DEPRECATED defined to 0
will give an error when they are included.
Because #warning is non-standard before C++23 we need to use pragmas to
ignore -Wc++23-extensions for the -Wsystem-headers -pedantic case.
One g++ test needs adjustment because it includes <ciso646>, but that
can be made conditional on the __cplusplus value without any reduction
in test coverage.
For the library tests, consolidate the std_c++0x_neg.cc XFAIL tests into
the macros.cc test, using dg-error with a { target c++98_only }
selector. This avoids having two separate test files, one for C++98 and
one for everything later. Also add tests for the <xxx.h> headers to
ensure that they behave as expected and don't give deprecated warnings.
libstdc++-v3/ChangeLog:
* doc/xml/manual/evolution.xml: Document deprecations.
* doc/html/*: Regenerate.
* include/c_compatibility/complex.h (_GLIBCXX_COMPLEX_H): Move
include guard to start of file. Include <complex> directly
instead of <ccomplex>.
* include/c_compatibility/tgmath.h: Include <cmath> and
<complex> directly, instead of <ctgmath>.
* include/c_global/ccomplex: Add deprecated #warning for C++17
and #error for C++20 if _GLIBCXX_USE_DEPRECATED == 0.
* include/c_global/ciso646: Likewise.
* include/c_global/cstdalign: Likewise.
* include/c_global/cstdbool: Likewise.
* include/c_global/ctgmath: Likewise.
* include/c_std/ciso646: Likewise.
* include/precompiled/stdc++.h: Do not include ccomplex,
ciso646, cstdalign, cstdbool, or ctgmath in C++17 and later.
* testsuite/18_support/headers/cstdalign/macros.cc: Check for
warnings and errors for unsupported dialects.
* testsuite/18_support/headers/cstdbool/macros.cc: Likewise.
* testsuite/26_numerics/headers/ctgmath/complex.cc: Likewise.
* testsuite/27_io/objects/char/1.cc: Do not include <ciso646>.
* testsuite/27_io/objects/wchar_t/1.cc: Likewise.
* testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc: Removed.
* testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc: Removed.
* testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc: Removed.
* testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc: Removed.
* testsuite/18_support/headers/ciso646/macros.cc: New test.
* testsuite/18_support/headers/ciso646/macros.h.cc: New test.
* testsuite/18_support/headers/cstdbool/macros.h.cc: New test.
* testsuite/26_numerics/headers/ccomplex/complex.cc: New test.
* testsuite/26_numerics/headers/ccomplex/complex.h.cc: New test.
* testsuite/26_numerics/headers/ctgmath/complex.h.cc: New test.
gcc/testsuite/ChangeLog:
* g++.old-deja/g++.other/headers1.C: Do not include ciso646 for
C++17 and later.
---
.../g++.old-deja/g++.other/headers1.C | 2 +
libstdc++-v3/doc/html/manual/api.html | 8 +++
libstdc++-v3/doc/xml/manual/evolution.xml | 10 ++++
.../include/c_compatibility/complex.h | 10 ++--
libstdc++-v3/include/c_compatibility/tgmath.h | 11 ++--
libstdc++-v3/include/c_global/ccomplex | 9 ++++
libstdc++-v3/include/c_global/ciso646 | 9 ++++
libstdc++-v3/include/c_global/cstdalign | 8 +++
libstdc++-v3/include/c_global/cstdbool | 8 +++
libstdc++-v3/include/c_global/ctgmath | 14 +++--
libstdc++-v3/include/c_std/ciso646 | 10 ++++
libstdc++-v3/include/precompiled/stdc++.h | 13 +++--
.../18_support/headers/ciso646/macros.cc | 51 +++++++++++++++++++
.../18_support/headers/ciso646/macros.h.cc | 49 ++++++++++++++++++
.../18_support/headers/cstdalign/macros.cc | 10 +++-
.../18_support/headers/cstdalign/macros.h.cc | 25 +++++++++
.../headers/cstdalign/std_c++0x_neg.cc | 24 ---------
.../18_support/headers/cstdbool/macros.cc | 9 +++-
.../18_support/headers/cstdbool/macros.h.cc | 21 ++++++++
.../headers/cstdbool/std_c++0x_neg.cc | 26 ----------
.../26_numerics/headers/ccomplex/complex.cc | 10 ++++
.../26_numerics/headers/ccomplex/complex.h.cc | 10 ++++
.../headers/ccomplex/std_c++0x_neg.cc | 26 ----------
.../26_numerics/headers/ctgmath/complex.cc | 9 +++-
.../26_numerics/headers/ctgmath/complex.h.cc | 10 ++++
.../headers/ctgmath/std_c++0x_neg.cc | 26 ----------
.../testsuite/27_io/objects/char/1.cc | 1 -
.../testsuite/27_io/objects/wchar_t/1.cc | 1 -
28 files changed, 294 insertions(+), 126 deletions(-)
create mode 100644 libstdc++-v3/testsuite/18_support/headers/ciso646/macros.cc
create mode 100644 libstdc++-v3/testsuite/18_support/headers/ciso646/macros.h.cc
create mode 100644
libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.h.cc
delete mode 100644
libstdc++-v3/testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc
create mode 100644
libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.h.cc
delete mode 100644
libstdc++-v3/testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc
create mode 100644
libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.cc
create mode 100644
libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.h.cc
delete mode 100644
libstdc++-v3/testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc
create mode 100644
libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.h.cc
delete mode 100644
libstdc++-v3/testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc
diff --git a/gcc/testsuite/g++.old-deja/g++.other/headers1.C
b/gcc/testsuite/g++.old-deja/g++.other/headers1.C
index 5d37e94082f..90a1a7dc8f9 100644
--- a/gcc/testsuite/g++.old-deja/g++.other/headers1.C
+++ b/gcc/testsuite/g++.old-deja/g++.other/headers1.C
@@ -12,7 +12,9 @@
#include <cctype>
#include <cerrno>
#include <cfloat>
+#if __cplusplus < 201703L
#include <ciso646>
+#endif
#include <climits>
#include <clocale>
#include <cmath>
diff --git a/libstdc++-v3/doc/html/manual/api.html
b/libstdc++-v3/doc/html/manual/api.html
index 799f6eae2a2..2ccfc07b83e 100644
--- a/libstdc++-v3/doc/html/manual/api.html
+++ b/libstdc++-v3/doc/html/manual/api.html
@@ -498,4 +498,12 @@ to be used with <code
class="code">std::basic_istream</code>.
longer allowed in C++20 mode.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_151"></a><code
class="constant">15</code></h3></div></div></div><p>
Enabled debug assertions by default for unoptimized builds.
+</p><p>
+Added warnings when including the headers that were deprecated in C++17
+and removed in C++20:
+<code class="filename"><ccomplex></code>,
+<code class="filename"><ciso646></code>,
+<code class="filename"><cstdalign></code>,
+<code class="filename"><cstdbool></code>, and
+<code class="filename"><ctgmath></code>.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="abi.html">Prev</a>??</td><td width="20%" align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td width="40%" align="right">??<a
accesskey="n" href="backwards.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ABI Policy and Guidelines??</td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top">??Backwards
Compatibility</td></tr></table></div></body></html>
\ No newline at end of file
diff --git a/libstdc++-v3/doc/xml/manual/evolution.xml
b/libstdc++-v3/doc/xml/manual/evolution.xml
index 75cf948a4a2..6b134de0e71 100644
--- a/libstdc++-v3/doc/xml/manual/evolution.xml
+++ b/libstdc++-v3/doc/xml/manual/evolution.xml
@@ -1135,6 +1135,16 @@ to be used with <code>std::basic_istream</code>.
Enabled debug assertions by default for unoptimized builds.
</para>
+<para>
+Added warnings when including the headers that were deprecated in C++17
+and removed in C++20:
+<filename class="headerfile"><ccomplex></filename>,
+<filename class="headerfile"><ciso646></filename>,
+<filename class="headerfile"><cstdalign></filename>,
+<filename class="headerfile"><cstdbool></filename>, and
+<filename class="headerfile"><ctgmath></filename>.
+</para>
+
</section>
</section>
diff --git a/libstdc++-v3/include/c_compatibility/complex.h
b/libstdc++-v3/include/c_compatibility/complex.h
index 605d1f30e06..461ff2117b1 100644
--- a/libstdc++-v3/include/c_compatibility/complex.h
+++ b/libstdc++-v3/include/c_compatibility/complex.h
@@ -26,10 +26,15 @@
* This is a Standard C++ Library header.
*/
+#ifndef _GLIBCXX_COMPLEX_H
+#define _GLIBCXX_COMPLEX_H 1
+
#include <bits/c++config.h>
#if __cplusplus >= 201103L
-# include <ccomplex>
+extern "C++" {
+#include <complex>
+}
#endif
#if __cplusplus >= 201103L && defined(__STRICT_ANSI__)
@@ -42,7 +47,4 @@
# endif
#endif
-#ifndef _GLIBCXX_COMPLEX_H
-#define _GLIBCXX_COMPLEX_H 1
-
#endif
diff --git a/libstdc++-v3/include/c_compatibility/tgmath.h
b/libstdc++-v3/include/c_compatibility/tgmath.h
index aadddd91b60..6bf6727a15c 100644
--- a/libstdc++-v3/include/c_compatibility/tgmath.h
+++ b/libstdc++-v3/include/c_compatibility/tgmath.h
@@ -32,11 +32,12 @@
#include <bits/c++config.h>
#if __cplusplus >= 201103L
-# include <ctgmath>
-#else
-# if _GLIBCXX_HAVE_TGMATH_H
-# include_next <tgmath.h>
-# endif
+# include <cmath>
+extern "C++" {
+# include <complex>
+}
+#elif _GLIBCXX_HAVE_TGMATH_H
+# include_next <tgmath.h>
#endif
#endif
diff --git a/libstdc++-v3/include/c_global/ccomplex
b/libstdc++-v3/include/c_global/ccomplex
index ee1166aaecb..b0e30fa67eb 100644
--- a/libstdc++-v3/include/c_global/ccomplex
+++ b/libstdc++-v3/include/c_global/ccomplex
@@ -41,4 +41,13 @@ extern "C++" {
#include <complex>
}
+#if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
+# error "<ccomplex> is not a standard header in C++20, use <complex.h>"
+#elif __cplusplus >= 201703L && defined __DEPRECATED
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++23-extensions"
+# warning "<ccomplex> is deprecated in C++17, use <complex.h>"
I'm not sure whether we should suggest <complex.h> or <complex> here.
It's hard to know what users might have intended when including
<ccomplex>. I suppose we should suggest <complex>, since that's what
they got for <ccomplex> in C++11 and C++14.
+# pragma GCC diagnostic pop
+#endif
+
#endif
diff --git a/libstdc++-v3/include/c_global/ciso646
b/libstdc++-v3/include/c_global/ciso646
index 6e26f9be12e..ed1fcf6f14e 100644
--- a/libstdc++-v3/include/c_global/ciso646
+++ b/libstdc++-v3/include/c_global/ciso646
@@ -38,4 +38,13 @@
#include <bits/c++config.h>
+#if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
+# error "<ciso646> is not a standard header in C++20, use <iso646.h> or
<version>"
+#elif __cplusplus >= 201703L && defined __DEPRECATED
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++23-extensions"
+# warning "<ciso646> is deprecated in C++17, use <iso646.h> or <version>"
There's no reason to include <ciso646> _except_ as a cheap header that
can be used to detect which std::lib you're using, e.g. as Howard used
to recommend:
https://stackoverflow.com/a/13220861/981959
https://stackoverflow.com/a/18832356/981959
The modern way to do that is <version>, but maybe <iso646.h> makes
more sense if somebody was including ciso46 for some other reason
(what reason though?)
+# pragma GCC diagnostic pop
+#endif
+
#endif
diff --git a/libstdc++-v3/include/c_global/cstdalign
b/libstdc++-v3/include/c_global/cstdalign
index 4f610588425..f7bbbad82a0 100644
--- a/libstdc++-v3/include/c_global/cstdalign
+++ b/libstdc++-v3/include/c_global/cstdalign
@@ -40,6 +40,14 @@
# if _GLIBCXX_HAVE_STDALIGN_H
# include <stdalign.h>
# endif
+# if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
+# error "<cstdalign> is not a standard header in C++20, use <stdalign.h>"
+# elif __cplusplus >= 201703L && defined __DEPRECATED
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++23-extensions"
+# warning "<cstdalign> is deprecated in C++17, use <stdalign.h>"
Should we suggest <stdalign.h>, or suggest simply removing <cstdalign>?
There's no reason to include <cstdalign> in C++ code, and just as
little reason to include <stdalign.h>
+# pragma GCC diagnostic pop
+# endif
#endif
#endif
diff --git a/libstdc++-v3/include/c_global/cstdbool
b/libstdc++-v3/include/c_global/cstdbool
index 8d2e75df33f..27be50ff510 100644
--- a/libstdc++-v3/include/c_global/cstdbool
+++ b/libstdc++-v3/include/c_global/cstdbool
@@ -40,6 +40,14 @@
# if _GLIBCXX_HAVE_STDBOOL_H
# include <stdbool.h>
# endif
+# if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
+# error "<cstdbool> is not a standard header in C++20, use <stdbool.h>"
+# elif __cplusplus >= 201703L && defined __DEPRECATED
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++23-extensions"
+# warning "<cstdbool> is deprecated in C++17, use <stdbool.h>"
Ditto. <stdbool.h> or just remove <cstdbool>?
+# pragma GCC diagnostic pop
+# endif
#endif
#endif
diff --git a/libstdc++-v3/include/c_global/ctgmath
b/libstdc++-v3/include/c_global/ctgmath
index 79c1a029f41..5824a20c7c0 100644
--- a/libstdc++-v3/include/c_global/ctgmath
+++ b/libstdc++-v3/include/c_global/ctgmath
@@ -26,13 +26,13 @@
* This is a Standard C++ Library header.
*/
+#ifndef _GLIBCXX_CTGMATH
+#define _GLIBCXX_CTGMATH 1
+
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
-#ifndef _GLIBCXX_CTGMATH
-#define _GLIBCXX_CTGMATH 1
-
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
@@ -40,6 +40,14 @@
extern "C++" {
# include <complex>
}
+# if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
+# error "<ctgmath> is not a standard header in C++20, use <tgmath.h>"
+# elif __cplusplus >= 201703L && defined __DEPRECATED
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++23-extensions"
+# warning "<ctgmath> is deprecated in C++17, use <tgmath.h>"
Include <complex>, or <cmath>, or <tgmath.h>?
+# pragma GCC diagnostic pop
+# endif
#endif
#endif
diff --git a/libstdc++-v3/include/c_std/ciso646
b/libstdc++-v3/include/c_std/ciso646
index 7971f0d0c31..ac9801aef2b 100644
--- a/libstdc++-v3/include/c_std/ciso646
+++ b/libstdc++-v3/include/c_std/ciso646
@@ -37,4 +37,14 @@
#endif
#include <bits/c++config.h>
+
+#if __cplusplus >= 202002L && ! _GLIBCXX_USE_DEPRECATED
+# error "<ciso646> is not a standard header in C++20, use <iso646.h> or
<version>"
+#elif __cplusplus >= 201703L && defined __DEPRECATED
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wc++23-extensions"
+# warning "<ciso646> is deprecated in C++17, use <iso646.h> or <version>"
+# pragma GCC diagnostic pop
+#endif
+
#endif
diff --git a/libstdc++-v3/include/precompiled/stdc++.h
b/libstdc++-v3/include/precompiled/stdc++.h
index 3eef20d1645..89917106bac 100644
--- a/libstdc++-v3/include/precompiled/stdc++.h
+++ b/libstdc++-v3/include/precompiled/stdc++.h
@@ -34,7 +34,6 @@
#endif
#include <cctype>
#include <cfloat>
-#include <ciso646>
#include <climits>
#include <csetjmp>
#include <cstdarg>
@@ -43,6 +42,9 @@
#if __cplusplus >= 201103L
#include <cstdint>
+#if __cplusplus < 201703L
+#include <ciso646>
+#endif
#endif
// C++
@@ -108,7 +110,6 @@
#include <cctype>
#include <cerrno>
#include <cfloat>
-#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
@@ -124,14 +125,16 @@
#include <cwctype>
#if __cplusplus >= 201103L
-#include <ccomplex>
#include <cfenv>
#include <cinttypes>
+#include <cstdint>
+#include <cuchar>
+#if __cplusplus < 201703L
+#include <ccomplex>
#include <cstdalign>
#include <cstdbool>
-#include <cstdint>
#include <ctgmath>
-#include <cuchar>
+#endif
#endif
// C++
diff --git a/libstdc++-v3/testsuite/18_support/headers/ciso646/macros.cc
b/libstdc++-v3/testsuite/18_support/headers/ciso646/macros.cc
new file mode 100644
index 00000000000..ab3a041de06
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/headers/ciso646/macros.cc
@@ -0,0 +1,51 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated -fno-operator-names"
}
+// { dg-do preprocess }
+
+#include <ciso646>
+
+// { dg-warning "deprecated" "" { target c++17_only } 0 }
+// { dg-error "not a standard header" "" { target c++20 } 0 }
+
+#ifdef and
+# error "The header <ciso646> defines a macro named and"
+#endif
+
+#ifdef and_eq
+# error "The header <ciso646> defines a macro named and_eq"
+#endif
+
+#ifdef bitand
+# error "The header <ciso646> defines a macro named bitand"
+#endif
+
+#ifdef bitor
+# error "The header <ciso646> defines a macro named bitor"
+#endif
+
+#ifdef compl
+# error "The header <ciso646> defines a macro named compl"
+#endif
+
+#ifdef not
+# error "The header <ciso646> defines a macro named not"
+#endif
+
+#ifdef not_eq
+# error "The header <ciso646> defines a macro named not_eq"
+#endif
+
+#ifdef or
+# error "The header <ciso646> defines a macro named or"
+#endif
+
+#ifdef or_eq
+# error "The header <ciso646> defines a macro named or_eq"
+#endif
+
+#ifdef xor
+# error "The header <ciso646> defines a macro named xor"
+#endif
+
+#ifdef xor_eq
+# error "The header <ciso646> defines a macro named xor_eq"
+#endif
diff --git a/libstdc++-v3/testsuite/18_support/headers/ciso646/macros.h.cc
b/libstdc++-v3/testsuite/18_support/headers/ciso646/macros.h.cc
new file mode 100644
index 00000000000..a70c18de918
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/headers/ciso646/macros.h.cc
@@ -0,0 +1,49 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated -fno-operator-names"
}
+// { dg-do preprocess }
+// { dg-bogus "deprecated" "C++17 deprecated <ciso646> but not <iso646.h>" }
+
+#include <iso646.h>
+
+#ifdef and
+# error "The header <iso646.h> defines a macro named and"
+#endif
+
+#ifdef and_eq
+# error "The header <iso646.h> defines a macro named and_eq"
+#endif
+
+#ifdef bitand
+# error "The header <iso646.h> defines a macro named bitand"
+#endif
+
+#ifdef bitor
+# error "The header <iso646.h> defines a macro named bitor"
+#endif
+
+#ifdef compl
+# error "The header <iso646.h> defines a macro named compl"
+#endif
+
+#ifdef not
+# error "The header <iso646.h> defines a macro named not"
+#endif
+
+#ifdef not_eq
+# error "The header <iso646.h> defines a macro named not_eq"
+#endif
+
+#ifdef or
+# error "The header <iso646.h> defines a macro named or"
+#endif
+
+#ifdef or_eq
+# error "The header <iso646.h> defines a macro named or_eq"
+#endif
+
+#ifdef xor
+# error "The header <iso646.h> defines a macro named xor"
+#endif
+
+#ifdef xor_eq
+# error "The header <iso646.h> defines a macro named xor_eq"
+#endif
diff --git a/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.cc
b/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.cc
index c50c921cd59..793cd26dfa8 100644
--- a/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.cc
+++ b/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.cc
@@ -1,8 +1,13 @@
-// { dg-options "-D_GLIBCXX_USE_DEPRECATED=1 -Wno-deprecated" }
-// { dg-do preprocess { target c++11 } }
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do preprocess }
#include <cstdalign>
+// { dg-error "ISO C.. 2011" "" { target c++98_only } 0 }
+// { dg-warning "deprecated" "" { target c++17_only } 0 }
+// { dg-error "not a standard header" "" { target c++20 } 0 }
+
+#if __cplusplus >= 201103L
#ifndef __alignas_is_defined
# error "The header <cstdalign> fails to define a macro named
__alignas_is_defined"
#elif __alignas_is_defined != 1
@@ -22,3 +27,4 @@
#ifdef alignof
# error "The header <cstdalign> defines a macro named alignof"
#endif
+#endif
diff --git a/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.h.cc
b/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.h.cc
new file mode 100644
index 00000000000..78f41ae02e8
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/headers/cstdalign/macros.h.cc
@@ -0,0 +1,25 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do preprocess { target c++11 } }
+// { dg-bogus "deprecated" "C++17 deprecated <cstdalign> but not <stdalign.h>"
}
+
+#include <stdalign.h>
+
+#ifndef __alignas_is_defined
+# error "The header <stdalign.h> fails to define a macro named
__alignas_is_defined"
+#elif __alignas_is_defined != 1
+# error "__alignas_is_defined is not defined to 1 in <stdalign.h>"
+#endif
+
+#ifndef __alignof_is_defined
+# error "The header <stdalign.h> fails to define a macro named
__alignof_is_defined"
+#elif __alignof_is_defined != 1
+# error "__alignof_is_defined is not defined to 1 in <stdalign.h>"
+#endif
+
+#ifdef alignas
+# error "The header <stdalign.h> defines a macro named alignas"
+#endif
+
+#ifdef alignof
+# error "The header <stdalign.h> defines a macro named alignof"
+#endif
diff --git
a/libstdc++-v3/testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc
b/libstdc++-v3/testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc
deleted file mode 100644
index 14694f034e6..00000000000
--- a/libstdc++-v3/testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-// { dg-options "-std=gnu++98" }
-// { dg-do compile { target c++98_only } }
-
-// Copyright (C) 2011-2024 Free Software Foundation, Inc.
-//
-// This file is part of the GNU ISO C++ Library. This library is free
-// software; you can redistribute it and/or modify it under the
-// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 3, or (at your option)
-// any later version.
-
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING3. If not see
-// <http://www.gnu.org/licenses/>.
-
-#include <cstdalign>
-
-// { dg-error "ISO C.. 2011" "" { target *-*-* } 32 }
-
diff --git a/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.cc
b/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.cc
index e0afc26e458..658a02a4565 100644
--- a/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.cc
+++ b/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.cc
@@ -1,4 +1,5 @@
-// { dg-do compile { target c++11 } }
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do preprocess }
// Copyright (C) 2012-2024 Free Software Foundation, Inc.
//
@@ -19,6 +20,11 @@
#include <cstdbool>
+// { dg-error "ISO C.. 2011" "" { target c++98_only } 0 }
+// { dg-warning "deprecated" "" { target c++17_only } 0 }
+// { dg-error "not a standard header" "" { target c++20 } 0 }
+
+#if __cplusplus >= 201103L
#ifndef __bool_true_false_are_defined
# error "The header <cstdbool> fails to define a macro named
__bool_true_false_are_defined"
#endif
@@ -34,3 +40,4 @@
#ifdef false
# error "The header <cstdbool> defines a macro named false"
#endif
+#endif
diff --git a/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.h.cc
b/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.h.cc
new file mode 100644
index 00000000000..a3c0f9a0aec
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/headers/cstdbool/macros.h.cc
@@ -0,0 +1,21 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do preprocess { target c++11 } }
+// { dg-bogus "deprecated" "C++17 deprecated <cstdbool> but not <stdbool.h>" }
+
+#include <stdbool.h>
+
+#ifndef __bool_true_false_are_defined
+# error "The header <stdbool.h> fails to define a macro named
__bool_true_false_are_defined"
+#endif
+
+#ifdef bool
+# error "The header <stdbool.h> defines a macro named bool"
+#endif
+
+#ifdef true
+# error "The header <stdbool.h> defines a macro named true"
+#endif
+
+#ifdef false
+# error "The header <stdbool.h> defines a macro named false"
+#endif
diff --git
a/libstdc++-v3/testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc
b/libstdc++-v3/testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc
deleted file mode 100644
index 5b8c5688877..00000000000
--- a/libstdc++-v3/testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-// { dg-options "-std=gnu++98" }
-// { dg-do compile { target c++98_only } }
-
-// Copyright (C) 2007-2024 Free Software Foundation, Inc.
-//
-// This file is part of the GNU ISO C++ Library. This library is free
-// software; you can redistribute it and/or modify it under the
-// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 3, or (at your option)
-// any later version.
-
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING3. If not see
-// <http://www.gnu.org/licenses/>.
-
-#include <cstdbool>
-
-// { dg-error "ISO C.. 2011" "" { target *-*-* } 32 }
-
-
-
diff --git a/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.cc
b/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.cc
new file mode 100644
index 00000000000..d6c33781ae5
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.cc
@@ -0,0 +1,10 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do compile }
+
+#include <ccomplex>
+
+std::complex<double> d;
+
+// { dg-error "ISO C.. 2011" "" { target c++98_only } 0 }
+// { dg-warning "deprecated" "" { target c++17_only } 0 }
+// { dg-error "not a standard header" "" { target c++20 } 0 }
diff --git a/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.h.cc
b/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.h.cc
new file mode 100644
index 00000000000..318b78ee89e
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/complex.h.cc
@@ -0,0 +1,10 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do compile }
+// { dg-bogus "deprecated" "C++17 deprecated <ccomplex> but not <complex.h>" }
+
+#include <complex.h>
+
+#if __cplusplus < 201103L
+# undef complex
+#endif
+std::complex<double> d; // { dg-error "does not name a template" "" { target
c++98_only } 0 }
diff --git
a/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc
b/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc
deleted file mode 100644
index 16c623b25b0..00000000000
--- a/libstdc++-v3/testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-// { dg-options "-std=gnu++98" }
-// { dg-do compile { target c++98_only } }
-
-// Copyright (C) 2007-2024 Free Software Foundation, Inc.
-//
-// This file is part of the GNU ISO C++ Library. This library is free
-// software; you can redistribute it and/or modify it under the
-// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 3, or (at your option)
-// any later version.
-
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING3. If not see
-// <http://www.gnu.org/licenses/>.
-
-#include <ccomplex>
-
-// { dg-error "ISO C.. 2011" "" { target *-*-* } 32 }
-
-
-
diff --git a/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.cc
b/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.cc
index a2c4a55c89b..ef2bbd0e20a 100644
--- a/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.cc
+++ b/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.cc
@@ -15,8 +15,13 @@
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
-// { dg-do compile { target c++11 } }
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do compile }
#include <ctgmath>
-std::complex<double> d;
+std::complex<double> d; // { dg-error "does not name a template" "" { target
c++98_only } 0 }
+
+// { dg-error "ISO C.. 2011" "" { target c++98_only } 0 }
+// { dg-warning "deprecated" "" { target c++17_only } 0 }
+// { dg-error "not a standard header" "" { target c++20 } 0 }
diff --git a/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.h.cc
b/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.h.cc
new file mode 100644
index 00000000000..fd6847bff4f
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/complex.h.cc
@@ -0,0 +1,10 @@
+// { dg-options "-D_GLIBCXX_USE_DEPRECATED=0 -Wdeprecated" }
+// { dg-do compile }
+// { dg-bogus "deprecated" "C++17 deprecated <ctgmath> but not <tgmath.h>" }
+
+#include <tgmath.h>
+
+#if __cplusplus < 201103L
+# undef complex
+#endif
+std::complex<double> d; // { dg-error "does not name a template" "" { target
c++98_only } 0 }
diff --git
a/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc
b/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc
deleted file mode 100644
index d693c8b23ed..00000000000
--- a/libstdc++-v3/testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-// { dg-options "-std=gnu++98" }
-// { dg-do compile { target c++98_only } }
-
-// Copyright (C) 2007-2024 Free Software Foundation, Inc.
-//
-// This file is part of the GNU ISO C++ Library. This library is free
-// software; you can redistribute it and/or modify it under the
-// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 3, or (at your option)
-// any later version.
-
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING3. If not see
-// <http://www.gnu.org/licenses/>.
-
-#include <ctgmath>
-
-// { dg-error "ISO C.. 2011" "" { target *-*-* } 32 }
-
-
-
diff --git a/libstdc++-v3/testsuite/27_io/objects/char/1.cc
b/libstdc++-v3/testsuite/27_io/objects/char/1.cc
index 9fc9244baf4..d50b3884702 100644
--- a/libstdc++-v3/testsuite/27_io/objects/char/1.cc
+++ b/libstdc++-v3/testsuite/27_io/objects/char/1.cc
@@ -53,7 +53,6 @@
#include <cctype>
#include <cerrno>
#include <cfloat>
-#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
diff --git a/libstdc++-v3/testsuite/27_io/objects/wchar_t/1.cc
b/libstdc++-v3/testsuite/27_io/objects/wchar_t/1.cc
index 23b2168805d..c2f3643b4e5 100644
--- a/libstdc++-v3/testsuite/27_io/objects/wchar_t/1.cc
+++ b/libstdc++-v3/testsuite/27_io/objects/wchar_t/1.cc
@@ -53,7 +53,6 @@
#include <cctype>
#include <cerrno>
#include <cfloat>
-#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
--
2.47.0
