Override default behavior of AC_CHECK_LIB so that we no longer

link libjerasure and libgf_complete to binaries built by configure

Makefile.am

@@ -25,7 +25,7 @@ check_PROGRAMS = text_xor_hd_code
 
 alg_sig_test_SOURCES = tests/alg_sig_test.c
 alg_sig_test_CPPFLAGS = -I./tests
-alg_sig_test_LDFLAGS = -static -lerasurecode -lgf_complete
+alg_sig_test_LDFLAGS = -static -lerasurecode -lgf_complete -lJerasure
 check_PROGRAMS += alg_sig_test
 
 test: alg_sig_test test_xor_hd_code

Makefile.in

@@ -375,7 +375,7 @@ test_xor_hd_code_CPPFLAGS = -I./tests
 test_xor_hd_code_LDFLAGS = -static -lerasurecode -lgf_complete
 alg_sig_test_SOURCES = tests/alg_sig_test.c
 alg_sig_test_CPPFLAGS = -I./tests
-alg_sig_test_LDFLAGS = -static -lerasurecode -lgf_complete
+alg_sig_test_LDFLAGS = -static -lerasurecode -lgf_complete -lJerasure
 all: all-am
 
 .SUFFIXES:

configure

@@ -11914,11 +11914,9 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_Jerasure_jerasure_autoconf_test" >&5
 $as_echo "$ac_cv_lib_Jerasure_jerasure_autoconf_test" >&6; }
 if test "x$ac_cv_lib_Jerasure_jerasure_autoconf_test" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBJERASURE 1
-_ACEOF
 
-  LIBS="-lJerasure $LIBS"
+               echo "Found libJerasure"
+               HAVE_LIBJERASURE = 1
 
 else
 
@@ -11966,11 +11964,9 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_gf_complete_gf_init_easy" >&5
 $as_echo "$ac_cv_lib_gf_complete_gf_init_easy" >&6; }
 if test "x$ac_cv_lib_gf_complete_gf_init_easy" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBGF_COMPLETE 1
-_ACEOF
 
-  LIBS="-lgf_complete $LIBS"
+               echo "Found libgf_complete"
+               HAVE_LIBGF_COMPLETE = 1
 
 else
 

configure.ac

@@ -22,14 +22,28 @@ AC_PROG_CC
 # Check for jerasure/gf_complete headers
 AC_CHECK_HEADERS(jerasure.h cauchy.h galois.h liberation.h reed_sol.h gf_complete.h)
 
-AC_CHECK_LIB([Jerasure], [jerasure_autoconf_test], [],
+dnl Default behavior of AC_CHECK_LIB if the library is found is to set the HAVE_LIB* 
+dnl variable and add the library to LIBS, which has the result of all compiles
+dnl --including those performed by configure-- linking against the discovered
+dnl library. This un-necessary linkage can increase build time as well as
+dnl complicates configuration, so default behavior has been overridden so we dont
+dnl set the LIBS.
+AC_CHECK_LIB([Jerasure], [jerasure_autoconf_test], 
+             [
+               echo "Found libJerasure"
+               HAVE_LIBJERASURE = 1
+             ],
              [
               echo "Error! You need to have libJerasure installed."
               echo "libJerasure is available from bitbucket.org/kmgreen2/jerasure-kmg.git"
               exit -1
              ])
 
-AC_CHECK_LIB([gf_complete], [gf_init_easy], [],
+AC_CHECK_LIB([gf_complete], [gf_init_easy],
+             [
+               echo "Found libgf_complete"
+               HAVE_LIBGF_COMPLETE = 1
+             ],
              [
               echo "Error! You need to have gf_complete installed."
               echo "gf_complete is available from http://web.eecs.utk.edu/~plank/plank/papers/CS-13-703.html"

include/config.h.in

@@ -27,12 +27,6 @@
 /* Define to 1 if you have the <liberation.h> header file. */
 #undef HAVE_LIBERATION_H
 
-/* Define to 1 if you have the `gf_complete' library (-lgf_complete). */
-#undef HAVE_LIBGF_COMPLETE
-
-/* Define to 1 if you have the `Jerasure' library (-lJerasure). */
-#undef HAVE_LIBJERASURE
-
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H