Install on CentOS 6/7

[benvmfarms]

I am trying to build this extension on CentOS 6.

I've installed LAPACK 3.4.2 from the upstream lapack and lapack-devel packages.

These packages place the shared libraries in /usr/lib64:

$ ls -la /usr/lib64/liblapack*
lrwxrwxrwx 1 root root      20 Jul 21 13:25 /usr/lib64/liblapack64.so -> liblapack64.so.3.4.2
lrwxrwxrwx 1 root root      20 Jul 21 13:25 /usr/lib64/liblapack64.so.3 -> liblapack64.so.3.4.2
lrwxrwxrwx 1 root root      20 Jul 21 13:25 /usr/lib64/liblapack64.so.3.4 -> liblapack64.so.3.4.2
-rwxr-xr-x 1 root root 5694736 Jul 21 13:18 /usr/lib64/liblapack64.so.3.4.2
lrwxrwxrwx 1 root root      19 Jul 21 13:25 /usr/lib64/liblapacke.so -> liblapacke.so.3.4.2
lrwxrwxrwx 1 root root      19 Jul 21 13:25 /usr/lib64/liblapacke.so.3 -> liblapacke.so.3.4.2
lrwxrwxrwx 1 root root      19 Jul 21 13:25 /usr/lib64/liblapacke.so.3.4 -> liblapacke.so.3.4.2
-rwxr-xr-x 1 root root 2257632 Jul 21 13:18 /usr/lib64/liblapacke.so.3.4.2
lrwxrwxrwx 1 root root      18 Jul 21 13:25 /usr/lib64/liblapack.so -> liblapack.so.3.4.2
lrwxrwxrwx 1 root root      18 Jul 21 13:25 /usr/lib64/liblapack.so.3 -> liblapack.so.3.4.2
lrwxrwxrwx 1 root root      18 Jul 21 13:25 /usr/lib64/liblapack.so.3.4 -> liblapack.so.3.4.2
-rwxr-xr-x 1 root root 5663656 Jul 21 13:18 /usr/lib64/liblapack.so.3.4.2

and the headers at /usr/include/lapacke:

$ ls -la /usr/include/lapacke*
total 1096
drwxr-xr-x   2 root root    4096 Jul 21 13:25 .
drwxr-xr-x. 49 root root    4096 Jul 21 15:28 ..
-rw-r--r--   1 root root    4236 Apr 12  2012 lapacke_config.h
-rw-r--r--   1 root root 1059092 Sep 20  2012 lapacke.h
-rw-r--r--   1 root root     474 Jul 21 13:12 lapacke_mangling.h
-rw-r--r--   1 root root     474 Feb 17  2012 lapacke_mangling_with_flags.h
-rw-r--r--   1 root root   33047 Mar 22  2012 lapacke_utils.h

I have attempted to modify the configure script to reference these new paths:

diff --git a/config.m4 b/config.m4
index ed440c7..cbfbf9f 100644
--- a/config.m4
+++ b/config.m4
@@ -26,9 +26,9 @@ dnl Get PHP version depending on shared/static build
   fi

   AC_MSG_CHECKING([for lapacke.h header])
-  for i in $PHP_LAPACK /usr/local /usr;
+  for i in $PHP_LAPACK/include /usr/include/lapacke;
   do
-    test -r $i/include/lapacke.h && LAPACK_PREFIX=$i && LAPACK_INC_DIR=$i/include && LAPACK_OK=1
+    test -r $i/lapacke.h && LAPACK_PREFIX=/usr/lib64 && LAPACK_INC_DIR=$i && LAPACK_OK=1
   done

   if test "$LAPACK_OK" != "1"; then
@@ -39,7 +39,7 @@ dnl Get PHP version depending on shared/static build

   AC_MSG_CHECKING([for lapacke shared libraries])
   PHP_CHECK_LIBRARY(lapacke, LAPACKE_dgesv, [
-    PHP_ADD_LIBRARY_WITH_PATH(lapacke, $LAPACK_PREFIX/lib, LAPACK_SHARED_LIBADD)
+    PHP_ADD_LIBRARY_WITH_PATH(lapacke, $LAPACK_PREFIX, LAPACK_SHARED_LIBADD)
     PHP_ADD_INCLUDE($LAPACK_INC_DIR)
   ],[
     AC_MSG_ERROR([not found. Make sure that lapacke is installed])

but the configure script fails to locate LAPACKE_dgesv.

checking for lapacke.h header... found in /usr/include/lapacke
checking for lapacke shared libraries... checking for LAPACKE_dgesv in -llapacke... no
configure: error: not found. Make sure that lapacke is installed

This symbol exists, of course:

$ readelf -Ws /usr/lib64/liblapacke.so | grep LAPACKE_dgesv
  1530: 00000000000a24a0   275 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesv
  1575: 00000000000a3ca0  2020 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesvx_work
  1668: 00000000000a25c0   716 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesv_work
  2055: 00000000000a2ac0  1766 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesvd_work
  2592: 00000000000a3410  1241 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesvj_work
  2925: 00000000000a2890   551 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesvd
  2935: 00000000000a31b0   597 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesvj
  2953: 00000000000a38f0   936 FUNC    GLOBAL DEFAULT   11 LAPACKE_dgesvx

Any hints on how to get this up and running using the paths above?

[mojsoskid]

I am experiencing the same issue on Debian using Lapack-3.8.0 .. Have you been able to find a solution?

[sanmai]

@mojsoskid try:

sudo update-alternatives --display liblapack.so.3-x86_64-linux-gnu

What would it tell you?

[mattikatti]

Was able to get it to compile and load with PHP 7.2 on CentOS 7.
Not the prettiest work, but the issue basically is that, it did not add needed lapack library to the linker.

Patch1-file:

--- lapack-0.1.0/config.m4	1970-01-01 09:13:08.000000000 +0000
+++ lapack-0.1.0/config.m4	2019-03-14 08:39:30.001497035 +0000
@@ -40,11 +40,12 @@
   AC_MSG_CHECKING([for lapacke shared libraries])
   PHP_CHECK_LIBRARY(lapacke, LAPACKE_dgesv, [
     PHP_ADD_LIBRARY_WITH_PATH(lapacke, $LAPACK_PREFIX/lib, LAPACK_SHARED_LIBADD)
+    PHP_ADD_LIBRARY_WITH_PATH(lapack, $LAPACK_PREFIX/lib, LAPACK_SHARED_LIBADD)
     PHP_ADD_INCLUDE($LAPACK_INC_DIR)
   ],[
     AC_MSG_ERROR([not found. Make sure that lapacke is installed])
   ],[
-    LAPACK_SHARED_LIBADD -llapacke
+    LAPACK_SHARED_LIBADD -llapacke -llapack
   ])

SPEC-file changes:

%patch1 -p1

%build
%{_bindir}/phpize
%configure --with-php-config=%{_bindir}/php-config  
%{__make} %{?_smp_mflags}