reduce external LAPACK requirement to 3.9.0

git-svn-id: https://svn.r-project.org/R/trunk@85804 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

configure

@@ -47575,8 +47575,8 @@ fi
 if test "${acx_lapack_ok}" = yes; then
   LIBS="-lblas -llapack ${FLIBS} ${acx_lapack_save_LIBS}"
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if LAPACK version >= 3.10.0" >&5
-printf %s "checking if LAPACK version >= 3.10.0... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if LAPACK version >= 3.9.0" >&5
+printf %s "checking if LAPACK version >= 3.9.0... " >&6; }
 if test ${r_cv_lapack_ver+y}
 then :
   printf %s "(cached) " >&6
@@ -47596,7 +47596,7 @@ int main(void) {
   int major, minor, patch;
   ${ilaver}(&major, &minor, &patch);
   printf("%d.%d.%d, so ", major, minor, patch);
-  if (major < 3 || (major == 3 && minor < 10)) exit(1);
+  if (major < 3 || (major == 3 && minor < 9)) exit(1);
   exit(0);
 }
 

doc/NEWS.Rd

@@ -278,11 +278,15 @@
       \item \command{configure} option \option{--enable-lto=check} has
       not worked reliably since 2019 and has been removed.
 
-      \item The minimum requirement for a maintainer build has been
-      increased to \command{autoconf}\sspace{}2.71, and it is intended to
-      increase to 2.72 before release. (The issue is better support for
-      \sQuote{C23}: \command{autoconf}\sspace{}2.72 requires a C version
-      of C90 or later, but \R has long required C99 or later.)
+      \item The minimum requirement \command{autoconf} for a maintainer
+      build has been increased to \command{autoconf}\sspace{}2.71, and
+      it is intended to increase to 2.72 before release. (The issue is
+      better support for \sQuote{C23}: \command{autoconf}\sspace{}2.72
+      requires a C version of C90 or later, but \R has long required C99
+      or later.)
+
+      \item The minimum version requirement for an external LAPACK has
+      been reduced to 3.9.0.
     }
   }
 

doc/manual/R-admin.texi

@@ -4087,7 +4087,7 @@ which is used.
 @cindex LAPACK library
 
 If when configuring @R{} a system LAPACK library is found of version
-3.10.0 or later (and does not contain BLAS routines) it will be used
+3.9.0 or later (and does not contain BLAS routines) it will be used
 instead of compiling the LAPACK code in the package sources.  This can
 be prevented by configuring @R{} with @option{--without-lapack}.
 Using a static @file{liblapack.a} is not supported.

m4/R.m4

@@ -1,6 +1,6 @@
 ### R.m4 -- extra macros for configuring R		-*- Autoconf -*-
 ###
-### Copyright (C) 1998-2023 R Core Team
+### Copyright (C) 1998-2024 R Core Team
 ###
 ### This file is part of R.
 ###
@@ -3152,8 +3152,8 @@ AC_SUBST(LAPACK_LIBS)
 
 ## R_LAPACK_SYSTEM_LIB
 ## -------------------
-## New for R 4.2.0
-## Look for system -llapack of version at least 3.10.0.
+## New for R 4.2.0: reduced to >=3.9.0 for 4.4.0.
+## Look for system -llapack of version at least 3.9.0.
 ## We have to test with a system BLAS.
 ## We don't want an external lapack which contains a BLAS.
 ## We document that at least ATLAS, OpenBLAS and Accelerate lapack
@@ -3291,7 +3291,7 @@ fi
 if test "${acx_lapack_ok}" = yes; then
   LIBS="-lblas -llapack ${FLIBS} ${acx_lapack_save_LIBS}"
 
-AC_CACHE_CHECK([if LAPACK version >= 3.10.0], [r_cv_lapack_ver],
+AC_CACHE_CHECK([if LAPACK version >= 3.9.0], [r_cv_lapack_ver],
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[
 extern void ${ilaver}(int *major, int *minor, int *patch);
 
@@ -3301,7 +3301,7 @@ int main(void) {
   int major, minor, patch;
   ${ilaver}(&major, &minor, &patch);
   printf("%d.%d.%d, so ", major, minor, patch);
-  if (major < 3 || (major == 3 && minor < 10)) exit(1);
+  if (major < 3 || (major == 3 && minor < 9)) exit(1);
   exit(0);
 }
 ]])],