NTL 11.0.0 not recognized

[Timo Kaufmann <timokau@…>]

For NTL versions > 10.4.0 (tested 11.0.0 and 11.2.1), the NTL check of the configure script fails. I've already added -std=c++11 and -O2 to the CXXFLAGS as suggested in ​https://github.com/Singular/Sources/issues/874.

Interestingly enough, the check doesn't fail for the top-level configure script but just for the "sub-scripts". config.log shows the following:

configure:20657: checking for NTL >= 5.0
configure:20687: g++ -o conftest  -pipe -fno-common -g0 -O3 -Wno-unused-function -Wno-trigraphs -Wno-unused-parameter -Wunknown-pragmas -Wno-unused-variable -fomit-frame-pointer -fwrapv -fvisibility=default -finline-functions -fno-exceptions -fno-threadsafe-statics -fno-enforce-eh-specs -fconserve-space -funroll-loops -fno-delete-null-pointer-checks -fno-rtti     -pipe -fno-common -g0 -O3 -Wno-unused-function -Wno-trigraphs -Wno-unused-parameter -Wunknown-pragmas -Wno-unused-variable -fomit-frame-pointer -fwrapv -fvisibility=default -finline-functions -fno-exceptions -funroll-loops -fno-delete-null-pointer-checks conftest.cpp  -lntl -lgmp >&5
/nix/store/0iggrca7z91pfniid12c63b75ga0rgbr-ntl-11.0.0/lib/libntl.so: undefined reference to `pthread_key_create'
/nix/store/0iggrca7z91pfniid12c63b75ga0rgbr-ntl-11.0.0/lib/libntl.so: undefined reference to `pthread_setspecific'
collect2: error: ld returned 1 exit status
configure:20687: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "libpolys"
| #define PACKAGE_TARNAME "libpolys"
| #define PACKAGE_VERSION "4.1.1"
| #define PACKAGE_STRING "libpolys 4.1.1"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define PACKAGE "libpolys"
| #define VERSION "4.1.1"
| #define OM_NDEBUG 1
| #define SING_NDEBUG 1
| #define SINGULAR_CFLAGS "-DSING_NDEBUG -DOM_NDEBUG"
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_DLFCN_H 1
| #define LT_OBJDIR ".libs/"
| #define HAVE_GMP 1
| /* end confdefs.h.  */
| #include <NTL/ZZ.h>
| int
| main ()
| {
| NTL::ZZ a;
|   ;
|   return 0;
| }
configure:20763: result: not found
configure:20765: WARNING: Unable to find NTL (which is strongly recommended) on your machine: please use --with-ntl=PATH_TO_DIR_CONTAINING_LIB_AND_INCLUDE (see also ./configure --help if you do not understand what we are talking about)

And ​here is the complete build log (search for NTL).

[hannes]

fixed with 4d8cea0593f05b8294ebd7fa3cb8b5a11b049b14 (add pthread tests before all NTL tests).

Funny fact: here is does also work without this change (Linux,gcc 6.4.0, NTL 11.0; OsX clang, NTL 11.0)