Refer to C23 in place of C2X in glibc

WG14 decided to use the name C23 as the informal name of the next
revision of the C standard (notwithstanding the publication date in
2024).  Update references to C2X in glibc to use the C23 name.

This is intended to update everything *except* where it involves
renaming files (the changes involving renaming tests are intended to
be done separately).  In the case of the _ISOC2X_SOURCE feature test
macro - the only user-visible interface involved - support for that
macro is kept for backwards compatibility, while adding
_ISOC23_SOURCE.

Tested for x86_64.

18 files changed, 28 insertions, 24 deletions

diff --git a/sysdeps/aarch64/bits/fenv.h b/sysdeps/aarch64/bits/fenv.h
index 78e54cd0e6..cefa660813 100644
--- a/sysdeps/aarch64/bits/fenv.h
+++ b/sysdeps/aarch64/bits/fenv.h
@@ -73,7 +73,7 @@ fenv_t;
 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/alpha/fpu/bits/fenv.h b/sysdeps/alpha/fpu/bits/fenv.h
index e0a2bde2b1..b664512140 100644
--- a/sysdeps/alpha/fpu/bits/fenv.h
+++ b/sysdeps/alpha/fpu/bits/fenv.h
@@ -132,7 +132,7 @@ typedef unsigned long int fenv_t;
 extern unsigned long int __ieee_get_fp_control (void) __THROW;
 extern void __ieee_set_fp_control (unsigned long int __value) __THROW;
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned long int femode_t;
 
diff --git a/sysdeps/arm/bits/fenv.h b/sysdeps/arm/bits/fenv.h
index fed591bf52..320e3abe0d 100644
--- a/sysdeps/arm/bits/fenv.h
+++ b/sysdeps/arm/bits/fenv.h
@@ -81,7 +81,7 @@ fenv_t;
 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/csky/bits/fenv.h b/sysdeps/csky/bits/fenv.h
index 0c55d29a7b..99c4470732 100644
--- a/sysdeps/csky/bits/fenv.h
+++ b/sysdeps/csky/bits/fenv.h
@@ -102,7 +102,7 @@ typedef struct
 # define FE_NOMASK_ENV	((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/hppa/fpu/bits/fenv.h b/sysdeps/hppa/fpu/bits/fenv.h
index 68a634e4ba..796155f0d0 100644
--- a/sysdeps/hppa/fpu/bits/fenv.h
+++ b/sysdeps/hppa/fpu/bits/fenv.h
@@ -89,7 +89,7 @@ typedef struct
 # define FE_NOMASK_ENV	((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/Makefile b/sysdeps/ieee754/ldbl-128ibm-compat/Makefile
index 34273a5f58..20cb2dbe35 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/Makefile
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/Makefile
@@ -354,8 +354,9 @@ tests += tst-ibm128-scanf-binary-c11 \
 	 tst-ieee128-scanf-binary-gnu11 \
 	 tst-ieee128-scanf-binary-gnu89
 
-# Some versions of GCC supported for building glibc do not support -std=c2x, so
-# the test for that version uses -std=c11 and then _ISOC2X_SOURCE is defined in
+# Some versions of GCC supported for building glibc do not support -std=c23
+# (added in GCC 14), or the older name -std=c2x (added in GCC 9), so
+# the test for that version uses -std=c11 and then _ISOC23_SOURCE is defined in
 # the test as needed.
 CFLAGS-tst-ibm128-scanf-binary-c11.c += -mabi=ibmlongdouble -Wno-psabi \
 					-std=c11 -DOBJPFX=\"$(objpfx)\"
@@ -390,8 +391,9 @@ tests += tst-ibm128-wscanf-binary-c11 \
 	 tst-ieee128-wscanf-binary-gnu11 \
 	 tst-ieee128-wscanf-binary-gnu89
 
-# Some versions of GCC supported for building glibc do not support -std=c2x, so
-# the test for that version uses -std=c11 and then _ISOC2X_SOURCE is defined in
+# Some versions of GCC supported for building glibc do not support -std=c23
+# (added in GCC 14), or the older name -std=c2x (added in GCC 9), so
+# the test for that version uses -std=c11 and then _ISOC23_SOURCE is defined in
 # the test as needed.
 CFLAGS-tst-ibm128-wscanf-binary-c11.c += -mabi=ibmlongdouble -Wno-psabi \
 					 -std=c11 -DOBJPFX=\"$(objpfx)\"
diff --git a/sysdeps/ieee754/ldbl-opt/Makefile b/sysdeps/ieee754/ldbl-opt/Makefile
index 0ed1cd2cae..f20c267081 100644
--- a/sysdeps/ieee754/ldbl-opt/Makefile
+++ b/sysdeps/ieee754/ldbl-opt/Makefile
@@ -236,8 +236,9 @@ tests += tst-nldbl-scanf-binary-c11 \
 	 tst-nldbl-scanf-binary-gnu11 \
 	 tst-nldbl-scanf-binary-gnu89
 
-# Some versions of GCC supported for building glibc do not support -std=c2x, so
-# the test for that version uses -std=c11 and then _ISOC2X_SOURCE is defined in
+# Some versions of GCC supported for building glibc do not support -std=c23
+# (added in GCC 14), or the older name -std=c2x (added in GCC 9), so
+# the test for that version uses -std=c11 and then _ISOC23_SOURCE is defined in
 # the test as needed.
 CFLAGS-tst-nldbl-scanf-binary-c11.c += -mlong-double-64 -std=c11 \
 				       -DOBJPFX=\"$(objpfx)\"
@@ -256,8 +257,9 @@ tests += tst-nldbl-wscanf-binary-c11 \
 	 tst-nldbl-wscanf-binary-gnu11 \
 	 tst-nldbl-wscanf-binary-gnu89
 
-# Some versions of GCC supported for building glibc do not support -std=c2x, so
-# the test for that version uses -std=c11 and then _ISOC2X_SOURCE is defined in
+# Some versions of GCC supported for building glibc do not support -std=c23
+# (added in GCC 14), or the older name -std=c2x (added in GCC 9), so
+# the test for that version uses -std=c11 and then _ISOC23_SOURCE is defined in
 # the test as needed.
 CFLAGS-tst-nldbl-wscanf-binary-c11.c += -mlong-double-64 -std=c11 \
 					-DOBJPFX=\"$(objpfx)\"
diff --git a/sysdeps/loongarch/bits/fenv.h b/sysdeps/loongarch/bits/fenv.h
index 4d4abefe5d..4417c42a19 100644
--- a/sysdeps/loongarch/bits/fenv.h
+++ b/sysdeps/loongarch/bits/fenv.h
@@ -81,7 +81,7 @@ typedef struct
 #define FE_NOMASK_ENV ((const fenv_t *) -257)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/m68k/bits/fenv.h b/sysdeps/m68k/bits/fenv.h
index e6912c3096..4dad131fb0 100644
--- a/sysdeps/m68k/bits/fenv.h
+++ b/sysdeps/m68k/bits/fenv.h
@@ -122,7 +122,7 @@ fenv_t;
 # define FE_NOMASK_ENV	((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/microblaze/bits/fenv.h b/sysdeps/microblaze/bits/fenv.h
index 50a58f730e..b44888e09a 100644
--- a/sysdeps/microblaze/bits/fenv.h
+++ b/sysdeps/microblaze/bits/fenv.h
@@ -41,7 +41,7 @@ typedef unsigned int fenv_t;
 /* If the default argument is used we use this value.  */
 #define FE_DFL_ENV	((const fenv_t *) -1l)
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/mips/bits/fenv.h b/sysdeps/mips/bits/fenv.h
index 707c11735a..9c82239b17 100644
--- a/sysdeps/mips/bits/fenv.h
+++ b/sysdeps/mips/bits/fenv.h
@@ -104,7 +104,7 @@ fenv_t;
 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/nios2/bits/fenv.h b/sysdeps/nios2/bits/fenv.h
index 6d46e61d6a..a8ec0cdcdb 100644
--- a/sysdeps/nios2/bits/fenv.h
+++ b/sysdeps/nios2/bits/fenv.h
@@ -43,7 +43,7 @@ typedef unsigned int fenv_t;
 /* If the default argument is used we use this value.  */
 #define FE_DFL_ENV	((const fenv_t *) -1)
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/powerpc/bits/fenv.h b/sysdeps/powerpc/bits/fenv.h
index 1050d8d6f0..fee7a567e7 100644
--- a/sysdeps/powerpc/bits/fenv.h
+++ b/sysdeps/powerpc/bits/fenv.h
@@ -170,7 +170,7 @@ extern const fenv_t __fe_nonieee_env;
 
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef double femode_t;
 
diff --git a/sysdeps/riscv/bits/fenv.h b/sysdeps/riscv/bits/fenv.h
index c90e8a117d..f3a069b2bd 100644
--- a/sysdeps/riscv/bits/fenv.h
+++ b/sysdeps/riscv/bits/fenv.h
@@ -65,7 +65,7 @@ typedef unsigned int fenv_t;
 /* If the default argument is used we use this value.  */
 #define FE_DFL_ENV	((__const fenv_t *) -1)
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/s390/fpu/bits/fenv.h b/sysdeps/s390/fpu/bits/fenv.h
index 3573140f85..258828eacc 100644
--- a/sysdeps/s390/fpu/bits/fenv.h
+++ b/sysdeps/s390/fpu/bits/fenv.h
@@ -90,7 +90,7 @@ typedef struct
 # define FE_NOMASK_ENV	((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/sh/bits/fenv.h b/sysdeps/sh/bits/fenv.h
index 4cc6ac79fd..200b6f52a8 100644
--- a/sysdeps/sh/bits/fenv.h
+++ b/sysdeps/sh/bits/fenv.h
@@ -75,7 +75,7 @@ fenv_t;
 /* If the default argument is used we use this value.  */
 #define FE_DFL_ENV	((const fenv_t *) -1)
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned int femode_t;
 
diff --git a/sysdeps/sparc/fpu/bits/fenv.h b/sysdeps/sparc/fpu/bits/fenv.h
index f49950d53e..8bee114973 100644
--- a/sysdeps/sparc/fpu/bits/fenv.h
+++ b/sysdeps/sparc/fpu/bits/fenv.h
@@ -83,7 +83,7 @@ typedef unsigned long int fenv_t;
 # define FE_NOMASK_ENV	((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef unsigned long int femode_t;
 
diff --git a/sysdeps/x86/fpu/bits/fenv.h b/sysdeps/x86/fpu/bits/fenv.h
index 472e751a88..8b4a95a904 100644
--- a/sysdeps/x86/fpu/bits/fenv.h
+++ b/sysdeps/x86/fpu/bits/fenv.h
@@ -101,7 +101,7 @@ fenv_t;
 # define FE_NOMASK_ENV	((const fenv_t *) -2)
 #endif
 
-#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C23)
 /* Type representing floating-point control modes.  */
 typedef struct
   {