newlib: add AC_CACHE_CHECK sugar around preprocessor checks

This isn't strictly necessary, but it makes for much clearer logs as
to what the target is doing, and provides cache vars for anyone who
wants to force the test a different way, and it lets the build cache
its own results when rerunning config.status.

4 files changed, 46 insertions, 25 deletions

diff --git a/newlib/libc/configure b/newlib/libc/configure
index 30e8bc55f..5f433dca3 100755
--- a/newlib/libc/configure
+++ b/newlib/libc/configure
@@ -12467,7 +12467,12 @@ fi
 
 
 if test "${machine_dir}" = "nds32"; then
-    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for nds32 V3M ISA" >&5
+$as_echo_n "checking for nds32 V3M ISA... " >&6; }
+if ${newlib_cv_nds32_isa_v3m+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #ifdef __NDS32_ISA_V3M__
 # error "This is nds32_isa_v3m."
@@ -12482,14 +12487,17 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_cpp "$LINENO"; then :
-  is_nds32_isa_v3m="no"
+  newlib_cv_nds32_isa_v3m="no"
 else
-  is_nds32_isa_v3m="yes"
+  newlib_cv_nds32_isa_v3m="yes"
 fi
 rm -f conftest.err conftest.i conftest.$ac_ext
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $newlib_cv_nds32_isa_v3m" >&5
+$as_echo "$newlib_cv_nds32_isa_v3m" >&6; }
+fi
 
- if test "$is_nds32_isa_v3m" = "yes"; then
+ if test "$newlib_cv_nds32_isa_v3m" = "yes"; then
   IS_NDS32_ISA_V3M_TRUE=
   IS_NDS32_ISA_V3M_FALSE='#'
 else
@@ -12524,7 +12532,12 @@ fi
 
 
 if test "${machine_dir}" = "sh"; then
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SH5 (64-bit)" >&5
+$as_echo_n "checking for SH5 (64-bit)... " >&6; }
+if ${newlib_cv_sh64+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #if !defined(__SH5__)
 # error "not SH5"
@@ -12539,14 +12552,17 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_cpp "$LINENO"; then :
-  have_sh64=yes
+  newlib_cv_sh64=yes
 else
-  have_sh64=no
+  newlib_cv_sh64=no
 fi
 rm -f conftest.err conftest.i conftest.$ac_ext
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $newlib_cv_sh64" >&5
+$as_echo "$newlib_cv_sh64" >&6; }
+fi
 
- if test "$have_sh64" = yes; then
+ if test "$newlib_cv_sh64" = yes; then
   SH64_TRUE=
   SH64_FALSE='#'
 else
@@ -12558,7 +12574,10 @@ fi
 if test "${machine_dir}" = "spu"; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports __ea" >&5
 $as_echo_n "checking whether the compiler supports __ea... " >&6; }
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+if ${newlib_cv_spu_compiler_has_ea+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #if !defined (__EA32__) && !defined (__EA64__)
 # error "__ea not supported"
@@ -12573,15 +12592,16 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_cpp "$LINENO"; then :
-  spu_compiler_has_ea=yes
+  newlib_cv_spu_compiler_has_ea=yes
 else
-  spu_compiler_has_ea=no
+  newlib_cv_spu_compiler_has_ea=no
 fi
 rm -f conftest.err conftest.i conftest.$ac_ext
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $spu_compiler_has_ea" >&5
-$as_echo "$spu_compiler_has_ea" >&6; }
 fi
- if test x${spu_compiler_has_ea} != xno; then
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $newlib_cv_spu_compiler_has_ea" >&5
+$as_echo "$newlib_cv_spu_compiler_has_ea" >&6; }
+fi
+ if test "$newlib_cv_spu_compiler_has_ea" = yes; then
   HAVE_SPU_EA_TRUE=
   HAVE_SPU_EA_FALSE='#'
 else
diff --git a/newlib/libc/machine/nds32/acinclude.m4 b/newlib/libc/machine/nds32/acinclude.m4
index 35c2afe99..ae8ea5d91 100644
--- a/newlib/libc/machine/nds32/acinclude.m4
+++ b/newlib/libc/machine/nds32/acinclude.m4
@@ -1,10 +1,11 @@
 if test "${machine_dir}" = "nds32"; then
   dnl Use builtin macro to detect if this is for "AndeStar ISA V3m".
-  AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
+  AC_CACHE_CHECK([for nds32 V3M ISA], newlib_cv_nds32_isa_v3m, [dnl
+    AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
 [[#ifdef __NDS32_ISA_V3M__
 # error "This is nds32_isa_v3m."
 #endif
-]])], [is_nds32_isa_v3m="no"], [is_nds32_isa_v3m="yes"])
+]])], [newlib_cv_nds32_isa_v3m="no"], [newlib_cv_nds32_isa_v3m="yes"])])
 fi
 
-AM_CONDITIONAL(IS_NDS32_ISA_V3M, test "$is_nds32_isa_v3m" = "yes")
+AM_CONDITIONAL(IS_NDS32_ISA_V3M, test "$newlib_cv_nds32_isa_v3m" = "yes")
diff --git a/newlib/libc/machine/sh/acinclude.m4 b/newlib/libc/machine/sh/acinclude.m4
index 60af7b1f1..66ec3b4e1 100644
--- a/newlib/libc/machine/sh/acinclude.m4
+++ b/newlib/libc/machine/sh/acinclude.m4
@@ -1,9 +1,10 @@
 if test "${machine_dir}" = "sh"; then
-  AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
+  AC_CACHE_CHECK([for SH5 (64-bit)], newlib_cv_sh64, [dnl
+    AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
 [[#if !defined(__SH5__)
 # error "not SH5"
 #endif
-]])], [have_sh64=yes], [have_sh64=no])
+]])], [newlib_cv_sh64=yes], [newlib_cv_sh64=no])])
 fi
 
-AM_CONDITIONAL(SH64, [test "$have_sh64" = yes])
+AM_CONDITIONAL(SH64, [test "$newlib_cv_sh64" = yes])
diff --git a/newlib/libc/machine/spu/acinclude.m4 b/newlib/libc/machine/spu/acinclude.m4
index 4e5fb363c..bca70e309 100644
--- a/newlib/libc/machine/spu/acinclude.m4
+++ b/newlib/libc/machine/spu/acinclude.m4
@@ -1,10 +1,9 @@
 if test "${machine_dir}" = "spu"; then
-  AC_MSG_CHECKING([whether the compiler supports __ea])
-  AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
+  AC_CACHE_CHECK([whether the compiler supports __ea], newlib_cv_spu_compiler_has_ea, [dnl
+    AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
 [[#if !defined (__EA32__) && !defined (__EA64__)
 # error "__ea not supported"
 #endif
-]])], [spu_compiler_has_ea=yes], [spu_compiler_has_ea=no])
-  AC_MSG_RESULT($spu_compiler_has_ea)
+]])], [newlib_cv_spu_compiler_has_ea=yes], [newlib_cv_spu_compiler_has_ea=no])])
 fi
-AM_CONDITIONAL(HAVE_SPU_EA, test x${spu_compiler_has_ea} != xno)
+AM_CONDITIONAL(HAVE_SPU_EA, test "$newlib_cv_spu_compiler_has_ea" = yes)