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git-svn-id: https://svn.r-project.org/R/trunk@87752 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

configure

@@ -8095,8 +8095,8 @@ CC_save=${CC}
 CFLAGS_save=${CFLAGS}
 CC_SUB=`echo "${CC}" | sed 's/-std=[^ ]*//'`
 CFLAGS_SUB=`echo "${CFLAGS}" | sed -e 's/-std=[^ ]*//'`
+: ${CC23="${CC_SUB} -std=gnu23"}
 : ${C23FLAGS="${CFLAGS_SUB}"}
-: ${CC23="${CC_SUB}"}
 CC=${CC23}
 CFLAGS=${C23FLAGS}
 unset r_cv_C23
@@ -8149,64 +8149,10 @@ fi
 printf "%s\n" "$r_cv_C23" >&6; }
 
 if test x${r_cv_C23} = xno; then
-  ${CC23="${CC_SUB} -std=gnu23"}
-  CC=${CC23}
-  CFLAGS=${C23FLAGS}
-  unset r_cv_C23
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether ${CC} is a C23 compiler" >&5
-printf %s "checking whether ${CC} is a C23 compiler... " >&6; }
-if test ${r_cv_C23+y}
-then :
-  printf %s "(cached) " >&6
-else case e in #(
-  e) if test "$cross_compiling" = yes
-then :
-  r_cv_C23=no
-else case e in #(
-  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#ifdef __STDC_VERSION__
-# if __STDC_VERSION__ < 202000L
-#  error "Compiler does not claim C23 conformance"
-# endif
-#else
-# error "Compiler does not advertise ISO C conformance"
-#endif
-
-// Most new features have feature tests. but bool type is fundamental.
-
-int main(void) {
-     bool x = true;
-
-     return 0;
-}
-
-
-_ACEOF
-if ac_fn_c_try_run "$LINENO"
-then :
-  r_cv_C23=yes
-else case e in #(
-  e) r_cv_C23=no ;;
-esac
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
-esac
-fi
- ;;
-esac
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $r_cv_C23" >&5
-printf "%s\n" "$r_cv_C23" >&6; }
-
-fi
-if test x${r_cv_C23} = xno; then
-  unset r_cv_C23
-  CC23="${CC_SUB} -std=gnu2x"
-  CC=${CC23}
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether ${CC} is a C23 compiler" >&5
+unset r_cv_C23
+CC23="${CC_SUB} -std=gnu2x"
+CC=${CC23}
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether ${CC} is a C23 compiler" >&5
 printf %s "checking whether ${CC} is a C23 compiler... " >&6; }
 if test ${r_cv_C23+y}
 then :
@@ -27583,7 +27529,7 @@ _ACEOF
 # flags.
 r_save_CFLAGS=$CFLAGS
 CFLAGS="$CFLAGS $r_verb"
-(eval echo $as_me:27586: \"$ac_link\") >&5
+(eval echo $as_me:27532: \"$ac_link\") >&5
 r_c_v_output=`eval $ac_link 5>&1 2>&1 | grep -v 'Driving:'`
 echo "$r_c_v_output" >&5
 CFLAGS=$r_save_CFLAGS
@@ -27661,7 +27607,7 @@ _ACEOF
 # flags.
 r_save_CFLAGS=$CFLAGS
 CFLAGS="$CFLAGS $r_cv_prog_c_v"
-(eval echo $as_me:27664: \"$ac_link\") >&5
+(eval echo $as_me:27610: \"$ac_link\") >&5
 r_c_v_output=`eval $ac_link 5>&1 2>&1 | grep -v 'Driving:'`
 echo "$r_c_v_output" >&5
 CFLAGS=$r_save_CFLAGS

configure.ac

@@ -756,26 +756,18 @@ CC_save=${CC}
 CFLAGS_save=${CFLAGS}
 CC_SUB=`echo "${CC}" | sed 's/-std=[[^ ]]*//'`
 CFLAGS_SUB=`echo "${CFLAGS}" | sed -e 's/-std=[[^ ]]*//'`
+dnl this is a hack until -std=gnu23 is widely accepted.
+: ${CC23="${CC_SUB} -std=gnu23"}
 : ${C23FLAGS="${CFLAGS_SUB}"}
-dnl first try without a flag for the likes of gcc15
-: ${CC23="${CC_SUB}"}
 CC=${CC23}
 CFLAGS=${C23FLAGS}
 unset r_cv_C23
 R_C23
 if test x${r_cv_C23} = xno; then
-  ${CC23="${CC_SUB} -std=gnu23"}
-  CC=${CC23}
-  CFLAGS=${C23FLAGS}
-  unset r_cv_C23
-  R_C23
-fi
-if test x${r_cv_C23} = xno; then
-dnl this is a hack until -std=gnu23 is widely accepted.
-  unset r_cv_C23
-  CC23="${CC_SUB} -std=gnu2x"
-  CC=${CC23}
-  R_C23
+unset r_cv_C23
+CC23="${CC_SUB} -std=gnu2x"
+CC=${CC23}
+R_C23
 fi
 if test x${r_cv_C23} = xno; then
 CC23=