Optionally compile the examples in autotools, compile+run in travis

.gitignore

@@ -10,10 +10,14 @@ tests
 exhaustive_tests
 gen_context
 valgrind_ctime_test
+keygen_example
+ecdh_example
 *.exe
 *.so
 *.a
 !.gitignore
+*.log
+*.trs
 
 Makefile
 configure

.travis.yml

@@ -17,7 +17,7 @@ compiler:
   - gcc
 env:
   global:
-    - FIELD=auto  BIGNUM=auto  SCALAR=auto  ENDOMORPHISM=no  STATICPRECOMPUTATION=yes  ECMULTGENPRECISION=auto  ASM=no  BUILD=check  EXTRAFLAGS=  HOST=  ECDH=no  RECOVERY=no  EXPERIMENTAL=no CTIMETEST=yes BENCH=yes ITERS=2
+    - FIELD=auto  BIGNUM=auto  SCALAR=auto  ENDOMORPHISM=no  STATICPRECOMPUTATION=yes  ECMULTGENPRECISION=auto  ASM=no  BUILD=check  EXTRAFLAGS=  HOST=  ECDH=no  RECOVERY=no  EXPERIMENTAL=no CTIMETEST=yes BENCH=yes ITERS=2 EXAMPLES=yes
   matrix:
     - SCALAR=32bit    RECOVERY=yes
     - SCALAR=32bit    FIELD=32bit       ECDH=yes  EXPERIMENTAL=yes

Makefile.am

@@ -48,6 +48,7 @@ noinst_HEADERS += contrib/lax_der_parsing.h
 noinst_HEADERS += contrib/lax_der_parsing.c
 noinst_HEADERS += contrib/lax_der_privatekey_parsing.h
 noinst_HEADERS += contrib/lax_der_privatekey_parsing.c
+noinst_HEADERS += examples/random.h
 
 if USE_EXTERNAL_ASM
 COMMON_LIB = libsecp256k1_common.la
@@ -121,6 +122,23 @@ exhaustive_tests_LDFLAGS = -static
 TESTS += exhaustive_tests
 endif
 
+if USE_EXAMPLES
+noinst_PROGRAMS += keygen_example
+keygen_example_SOURCES = examples/keygen.c
+keygen_example_CPPFLAGS = -I$(top_srcdir)/include $(SECP_INCLUDES)
+keygen_example_LDADD = libsecp256k1.la $(SECP_LIBS)
+keygen_example_LDFLAGS = -static
+TESTS += keygen_example
+if ENABLE_MODULE_ECDH
+noinst_PROGRAMS += ecdh_example
+ecdh_example_SOURCES = examples/ecdh.c
+ecdh_example_CPPFLAGS = -I$(top_srcdir)/include $(SECP_INCLUDES)
+ecdh_example_LDADD = libsecp256k1.la $(SECP_LIBS)
+ecdh_example_LDFLAGS = -static
+TESTS += ecdh_example
+endif
+endif
+
 if USE_ECMULT_STATIC_PRECOMPUTATION
 CPPFLAGS_FOR_BUILD +=-I$(top_srcdir) -I$(builddir)/src
 

configure.ac

@@ -116,6 +116,11 @@ AC_ARG_ENABLE(exhaustive_tests,
     [use_exhaustive_tests=$enableval],
     [use_exhaustive_tests=yes])
 
+    AC_ARG_ENABLE(examples,
+    AS_HELP_STRING([--enable-examples],[compile the examples [default=no]]),
+    [use_examples=$enableval],
+    [use_examples=no])
+
 AC_ARG_ENABLE(endomorphism,
     AS_HELP_STRING([--enable-endomorphism],[enable endomorphism [default=no]]),
     [use_endomorphism=$enableval],
@@ -527,6 +532,7 @@ AC_SUBST(SECP_TEST_INCLUDES)
 AM_CONDITIONAL([ENABLE_COVERAGE], [test x"$enable_coverage" = x"yes"])
 AM_CONDITIONAL([USE_TESTS], [test x"$use_tests" != x"no"])
 AM_CONDITIONAL([USE_EXHAUSTIVE_TESTS], [test x"$use_exhaustive_tests" != x"no"])
+AM_CONDITIONAL([USE_EXAMPLES], [test x"$use_examples" != x"no"])
 AM_CONDITIONAL([USE_BENCHMARK], [test x"$use_benchmark" = x"yes"])
 AM_CONDITIONAL([USE_ECMULT_STATIC_PRECOMPUTATION], [test x"$set_precomp" = x"yes"])
 AM_CONDITIONAL([ENABLE_MODULE_ECDH], [test x"$enable_module_ecdh" = x"yes"])
@@ -548,6 +554,7 @@ echo "  with ecmult precomp     = $set_precomp"
 echo "  with external callbacks = $use_external_default_callbacks"
 echo "  with benchmarks         = $use_benchmark"
 echo "  with coverage           = $enable_coverage"
+echo "  with examples           = $use_examples"
 echo "  module ecdh             = $enable_module_ecdh"
 echo "  module recovery         = $enable_module_recovery"
 echo

contrib/travis.sh

@@ -16,7 +16,7 @@ fi
     --enable-experimental="$EXPERIMENTAL" --enable-endomorphism="$ENDOMORPHISM" \
     --with-field="$FIELD" --with-bignum="$BIGNUM" --with-asm="$ASM" --with-scalar="$SCALAR" \
     --enable-ecmult-static-precomputation="$STATICPRECOMPUTATION" --with-ecmult-gen-precision="$ECMULTGENPRECISION" \
-    --enable-module-ecdh="$ECDH" --enable-module-recovery="$RECOVERY" \
+    --enable-module-ecdh="$ECDH" --enable-module-recovery="$RECOVERY" --enable-examples="$EXAMPLES" \
     --host="$HOST" $EXTRAFLAGS
 
 if [ -n "$BUILD" ]