Added automatic detection of quadmath library to configure.ac, while …

clean.sh

@@ -0,0 +1,2 @@
+rm -f */*.o
+rm -f */*.so

configure.ac

@@ -1,6 +1,7 @@
 
 AC_INIT([src/qzeta_function.c])
 AC_PROG_CXX
+
 AC_CHECK_LIB(gsl, gsl_sf_airy_Ai_e,
              [LIBS="${LIBS} -lgsl -lgslcblas"], 
              [AC_MSG_ERROR([Cannot find Gnu Scientific Library.])],
@@ -33,6 +34,39 @@ else
   AC_MSG_RESULT([yes])
 fi
 
+# if the user has not specified a library path for the quadmath library
+# we try to auto-detect it
+# currenty, if we fail to find it, we abort compilation
+# in the future one could disable the quad precision
+# implementation in this case
+if test -z "${QUADMATH_LIB_DIR}"; then
+  AC_SEARCH_LIBS([expq],
+                 [quadmath],
+                 [],
+                 [AC_MSG_ERROR([unable to find the quadmath libary!])]
+                 )
+fi
+
+gsl_custom_lib=""
+gsl_custom_include=""
+if test -n "${GSL_DIR}"; then
+  gsl_custom_lib="-L${GSL_DIR}/lib -lgsl -lgslcblas"
+  gsl_custom_include="-I${GSL_DIR}/include"
+fi
+
+quadmath_custom_lib=""
+quadmath_custom_include=""
+if test -n "${QUADMATH_LIB_DIR}"; then
+  quadmath_custom_lib="-L${QUADMATH_LIB_DIR}/ -lquadmath"
+fi
+if test -n "${QUADMATH_INCLUDE_DIR}"; then
+  quadmath_custom_include="-I${QUADMATH_INCLUDE_DIR}/"
+fi
+
+# construct src/Makevars with the manually or automatically detected library paths and flags
+echo "PKG_LIBS=-lm ${LIBS} ${quadmath_custom_lib} ${gsl_custom_lib}" > src/Makevars
+echo "PKG_CFLAGS=-march=native -mtune=native -O3 -Wall ${quadmath_custom_include} ${gsl_custom_include}" >> src/Makevars
+echo "PKG_LDFLAGS=-lm ${LIBS} ${gsl_custom_lib} ${quadmath_custom_lib}" >> src/Makevars
 
 AC_OUTPUT()