2 AC_INIT([libsecp256k1],[0.1])
3 AC_CONFIG_AUX_DIR([build-aux])
4 AC_CONFIG_MACRO_DIR([build-aux/m4])
6 AH_TOP([#ifndef LIBSECP256K1_CONFIG_H])
7 AH_TOP([#define LIBSECP256K1_CONFIG_H])
8 AH_BOTTOM([#endif /*LIBSECP256K1_CONFIG_H*/])
9 AM_INIT_AUTOMAKE([foreign subdir-objects])
11 # Set -g if CFLAGS are not already set, which matches the default autoconf
12 # behavior (see PROG_CC in the Autoconf manual) with the exception that we don't
13 # set -O2 here because we set it in any case (see further down).
17 # Make the compilation flags quiet unless V=1 is used.
18 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
23 AC_PATH_TOOL(RANLIB, ranlib)
24 AC_PATH_TOOL(STRIP, strip)
26 # Save definition of AC_PROG_CC because AM_PROG_CC_C_O in automake<=1.13 will
27 # redefine AC_PROG_CC to exit with an error, which avoids the user calling it
28 # accidently and screwing up the effect of AM_PROG_CC_C_O. However, we'll need
29 # AC_PROG_CC later on in AX_PROG_CC_FOR_BUILD, where its usage is fine, and
30 # we'll carefully make sure not to call AC_PROG_CC anywhere else.
31 m4_copy([AC_PROG_CC], [saved_AC_PROG_CC])
34 m4_rename_force([saved_AC_PROG_CC], [AC_PROG_CC])
37 if test x"$ac_cv_prog_cc_c89" = x"no"; then
38 AC_MSG_ERROR([c89 compiler support required])
44 if test x$cross_compiling != xyes; then
45 AC_PATH_PROG([BREW],brew,)
46 if test x$BREW != x; then
47 # These Homebrew packages may be keg-only, meaning that they won't be found
48 # in expected paths because they may conflict with system files. Ask
49 # Homebrew where each one is located, then adjust paths accordingly.
50 openssl_prefix=`$BREW --prefix openssl 2>/dev/null`
51 gmp_prefix=`$BREW --prefix gmp 2>/dev/null`
52 valgrind_prefix=`$BREW --prefix valgrind 2>/dev/null`
53 if test x$openssl_prefix != x; then
54 PKG_CONFIG_PATH="$openssl_prefix/lib/pkgconfig:$PKG_CONFIG_PATH"
55 export PKG_CONFIG_PATH
56 CRYPTO_CPPFLAGS="-I$openssl_prefix/include"
58 if test x$gmp_prefix != x; then
59 GMP_CPPFLAGS="-I$gmp_prefix/include"
60 GMP_LIBS="-L$gmp_prefix/lib"
62 if test x$valgrind_prefix != x; then
63 VALGRIND_CPPFLAGS="-I$valgrind_prefix/include"
66 AC_PATH_PROG([PORT],port,)
67 # If homebrew isn't installed and macports is, add the macports default paths
69 if test x$PORT != x; then
70 CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
71 LDFLAGS="$LDFLAGS -L/opt/local/lib"
80 warn_CFLAGS="-std=c89 -pedantic -Wall -Wextra -Wcast-align -Wnested-externs -Wshadow -Wstrict-prototypes -Wundef -Wno-unused-function -Wno-long-long -Wno-overlength-strings"
81 saved_CFLAGS="$CFLAGS"
82 CFLAGS="$warn_CFLAGS $CFLAGS"
83 AC_MSG_CHECKING([if ${CC} supports ${warn_CFLAGS}])
84 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
85 [ AC_MSG_RESULT([yes]) ],
87 CFLAGS="$saved_CFLAGS"
90 saved_CFLAGS="$CFLAGS"
91 CFLAGS="-fvisibility=hidden $CFLAGS"
92 AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
93 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
94 [ AC_MSG_RESULT([yes]) ],
96 CFLAGS="$saved_CFLAGS"
100 ### Define config arguments
103 AC_ARG_ENABLE(benchmark,
104 AS_HELP_STRING([--enable-benchmark],[compile benchmark [default=yes]]),
105 [use_benchmark=$enableval],
108 AC_ARG_ENABLE(coverage,
109 AS_HELP_STRING([--enable-coverage],[enable compiler flags to support kcov coverage analysis [default=no]]),
110 [enable_coverage=$enableval],
111 [enable_coverage=no])
114 AS_HELP_STRING([--enable-tests],[compile tests [default=yes]]),
115 [use_tests=$enableval],
118 AC_ARG_ENABLE(openssl_tests,
119 AS_HELP_STRING([--enable-openssl-tests],[enable OpenSSL tests [default=auto]]),
120 [enable_openssl_tests=$enableval],
121 [enable_openssl_tests=auto])
123 AC_ARG_ENABLE(experimental,
124 AS_HELP_STRING([--enable-experimental],[allow experimental configure options [default=no]]),
125 [use_experimental=$enableval],
126 [use_experimental=no])
128 AC_ARG_ENABLE(exhaustive_tests,
129 AS_HELP_STRING([--enable-exhaustive-tests],[compile exhaustive tests [default=yes]]),
130 [use_exhaustive_tests=$enableval],
131 [use_exhaustive_tests=yes])
133 AC_ARG_ENABLE(ecmult_static_precomputation,
134 AS_HELP_STRING([--enable-ecmult-static-precomputation],[enable precomputed ecmult table for signing [default=auto]]),
135 [use_ecmult_static_precomputation=$enableval],
136 [use_ecmult_static_precomputation=auto])
138 AC_ARG_ENABLE(module_ecdh,
139 AS_HELP_STRING([--enable-module-ecdh],[enable ECDH shared secret computation]),
140 [enable_module_ecdh=$enableval],
141 [enable_module_ecdh=no])
143 AC_ARG_ENABLE(module_recovery,
144 AS_HELP_STRING([--enable-module-recovery],[enable ECDSA pubkey recovery module [default=no]]),
145 [enable_module_recovery=$enableval],
146 [enable_module_recovery=no])
148 AC_ARG_ENABLE(module_extrakeys,
149 AS_HELP_STRING([--enable-module-extrakeys],[enable extrakeys module (experimental)]),
150 [enable_module_extrakeys=$enableval],
151 [enable_module_extrakeys=no])
153 AC_ARG_ENABLE(module_schnorrsig,
154 AS_HELP_STRING([--enable-module-schnorrsig],[enable schnorrsig module (experimental)]),
155 [enable_module_schnorrsig=$enableval],
156 [enable_module_schnorrsig=no])
158 AC_ARG_ENABLE(external_default_callbacks,
159 AS_HELP_STRING([--enable-external-default-callbacks],[enable external default callback functions [default=no]]),
160 [use_external_default_callbacks=$enableval],
161 [use_external_default_callbacks=no])
163 # Test-only override of the (autodetected by the C code) "widemul" setting.
164 # Legal values are int64 (for [u]int64_t), int128 (for [unsigned] __int128), and auto (the default).
165 AC_ARG_WITH([test-override-wide-multiply], [] ,[set_widemul=$withval], [set_widemul=auto])
167 AC_ARG_WITH([bignum], [AS_HELP_STRING([--with-bignum=gmp|no|auto],
168 [bignum implementation to use [default=auto]])],[req_bignum=$withval], [req_bignum=auto])
170 AC_ARG_WITH([asm], [AS_HELP_STRING([--with-asm=x86_64|arm|no|auto],
171 [assembly optimizations to useĀ (experimental: arm) [default=auto]])],[req_asm=$withval], [req_asm=auto])
173 AC_ARG_WITH([ecmult-window], [AS_HELP_STRING([--with-ecmult-window=SIZE|auto],
174 [window size for ecmult precomputation for verification, specified as integer in range [2..24].]
175 [Larger values result in possibly better performance at the cost of an exponentially larger precomputed table.]
176 [The table will store 2^(SIZE-1) * 64 bytes of data but can be larger in memory due to platform-specific padding and alignment.]
177 ["auto" is a reasonable setting for desktop machines (currently 15). [default=auto]]
179 [req_ecmult_window=$withval], [req_ecmult_window=auto])
181 AC_ARG_WITH([ecmult-gen-precision], [AS_HELP_STRING([--with-ecmult-gen-precision=2|4|8|auto],
182 [Precision bits to tune the precomputed table size for signing.]
183 [The size of the table is 32kB for 2 bits, 64kB for 4 bits, 512kB for 8 bits of precision.]
184 [A larger table size usually results in possible faster signing.]
185 ["auto" is a reasonable setting for desktop machines (currently 4). [default=auto]]
187 [req_ecmult_gen_precision=$withval], [req_ecmult_gen_precision=auto])
189 AC_ARG_WITH([valgrind], [AS_HELP_STRING([--with-valgrind=yes|no|auto],
190 [Build with extra checks for running inside Valgrind [default=auto]]
192 [req_valgrind=$withval], [req_valgrind=auto])
195 ### Handle config options (except for modules)
198 if test x"$req_valgrind" = x"no"; then
202 if test x"$has_valgrind" != x"yes"; then
203 if test x"$req_valgrind" = x"yes"; then
204 AC_MSG_ERROR([Valgrind support explicitly requested but valgrind/memcheck.h header not available])
211 AM_CONDITIONAL([VALGRIND_ENABLED],[test "$enable_valgrind" = "yes"])
213 if test x"$enable_coverage" = x"yes"; then
214 AC_DEFINE(COVERAGE, 1, [Define this symbol to compile out all VERIFY code])
215 CFLAGS="-O0 --coverage $CFLAGS"
216 LDFLAGS="--coverage $LDFLAGS"
221 if test x"$req_asm" = x"auto"; then
223 if test x"$has_64bit_asm" = x"yes"; then
226 if test x"$set_asm" = x; then
234 if test x"$has_64bit_asm" != x"yes"; then
235 AC_MSG_ERROR([x86_64 assembly optimization requested but not available])
243 AC_MSG_ERROR([invalid assembly optimization selection])
248 if test x"$req_bignum" = x"auto"; then
250 if test x"$has_gmp" = x"yes"; then
254 if test x"$set_bignum" = x; then
258 set_bignum=$req_bignum
262 if test x"$has_gmp" != x"yes"; then
263 AC_MSG_ERROR([gmp bignum explicitly requested but libgmp not available])
269 AC_MSG_ERROR([invalid bignum implementation selection])
274 # Select assembly optimization
279 AC_DEFINE(USE_ASM_X86_64, 1, [Define this symbol to enable x86_64 assembly optimizations])
287 AC_MSG_ERROR([invalid assembly optimizations])
291 if test x"$use_external_asm" = x"yes"; then
292 AC_DEFINE(USE_EXTERNAL_ASM, 1, [Define this symbol if an external (non-inline) assembly implementation is used])
296 # Select wide multiplication implementation
299 AC_DEFINE(USE_FORCE_WIDEMUL_INT128, 1, [Define this symbol to force the use of the (unsigned) __int128 based wide multiplication implementation])
302 AC_DEFINE(USE_FORCE_WIDEMUL_INT64, 1, [Define this symbol to force the use of the (u)int64_t based wide multiplication implementation])
307 AC_MSG_ERROR([invalid wide multiplication implementation])
311 # Select bignum implementation
314 AC_DEFINE(HAVE_LIBGMP, 1, [Define this symbol if libgmp is installed])
315 AC_DEFINE(USE_NUM_GMP, 1, [Define this symbol to use the gmp implementation for num])
316 AC_DEFINE(USE_FIELD_INV_NUM, 1, [Define this symbol to use the num-based field inverse implementation])
317 AC_DEFINE(USE_SCALAR_INV_NUM, 1, [Define this symbol to use the num-based scalar inverse implementation])
320 AC_DEFINE(USE_NUM_NONE, 1, [Define this symbol to use no num implementation])
321 AC_DEFINE(USE_FIELD_INV_BUILTIN, 1, [Define this symbol to use the native field inverse implementation])
322 AC_DEFINE(USE_SCALAR_INV_BUILTIN, 1, [Define this symbol to use the native scalar inverse implementation])
325 AC_MSG_ERROR([invalid bignum implementation])
329 # Set ecmult window size
330 if test x"$req_ecmult_window" = x"auto"; then
333 set_ecmult_window=$req_ecmult_window
336 error_window_size=['window size for ecmult precomputation not an integer in range [2..24] or "auto"']
337 case $set_ecmult_window in
340 AC_MSG_ERROR($error_window_size)
343 if test "$set_ecmult_window" -lt 2 -o "$set_ecmult_window" -gt 24 ; then
345 AC_MSG_ERROR($error_window_size)
347 AC_DEFINE_UNQUOTED(ECMULT_WINDOW_SIZE, $set_ecmult_window, [Set window size for ecmult precomputation])
351 # Set ecmult gen precision
352 if test x"$req_ecmult_gen_precision" = x"auto"; then
353 set_ecmult_gen_precision=4
355 set_ecmult_gen_precision=$req_ecmult_gen_precision
358 case $set_ecmult_gen_precision in
360 AC_DEFINE_UNQUOTED(ECMULT_GEN_PREC_BITS, $set_ecmult_gen_precision, [Set ecmult gen precision bits])
363 AC_MSG_ERROR(['ecmult gen precision not 2, 4, 8 or "auto"'])
367 if test x"$use_tests" = x"yes"; then
369 if test x"$enable_openssl_tests" != x"no" && test x"$has_openssl_ec" = x"yes"; then
370 enable_openssl_tests=yes
371 AC_DEFINE(ENABLE_OPENSSL_TESTS, 1, [Define this symbol if OpenSSL EC functions are available])
372 SECP_TEST_INCLUDES="$SSL_CFLAGS $CRYPTO_CFLAGS $CRYPTO_CPPFLAGS"
373 SECP_TEST_LIBS="$CRYPTO_LIBS"
377 SECP_TEST_LIBS="$SECP_TEST_LIBS -lgdi32"
381 if test x"$enable_openssl_tests" = x"yes"; then
382 AC_MSG_ERROR([OpenSSL tests requested but OpenSSL with EC support is not available])
384 enable_openssl_tests=no
387 if test x"$enable_openssl_tests" = x"yes"; then
388 AC_MSG_ERROR([OpenSSL tests requested but tests are not enabled])
390 enable_openssl_tests=no
393 if test x"$set_bignum" = x"gmp"; then
394 SECP_LIBS="$SECP_LIBS $GMP_LIBS"
395 SECP_INCLUDES="$SECP_INCLUDES $GMP_CPPFLAGS"
398 if test x"$enable_valgrind" = x"yes"; then
399 SECP_INCLUDES="$SECP_INCLUDES $VALGRIND_CPPFLAGS"
402 # Handle static precomputation (after everything which modifies CFLAGS and friends)
403 if test x"$use_ecmult_static_precomputation" != x"no"; then
404 if test x"$cross_compiling" = x"no"; then
406 if test x"${CC_FOR_BUILD+x}${CFLAGS_FOR_BUILD+x}${CPPFLAGS_FOR_BUILD+x}${LDFLAGS_FOR_BUILD+x}" != x; then
407 AC_MSG_WARN([CC_FOR_BUILD, CFLAGS_FOR_BUILD, CPPFLAGS_FOR_BUILD, and/or LDFLAGS_FOR_BUILD is set but ignored because we are not cross-compiling.])
409 # If we're not cross-compiling, simply use the same compiler for building the static precompation code.
411 CFLAGS_FOR_BUILD="$CFLAGS"
412 CPPFLAGS_FOR_BUILD="$CPPFLAGS"
413 LDFLAGS_FOR_BUILD="$LDFLAGS"
417 # Temporarily switch to an environment for the native compiler
418 save_cross_compiling=$cross_compiling
422 SAVE_CFLAGS="$CFLAGS"
423 CFLAGS="$CFLAGS_FOR_BUILD"
424 SAVE_CPPFLAGS="$CPPFLAGS"
425 CPPFLAGS="$CPPFLAGS_FOR_BUILD"
426 SAVE_LDFLAGS="$LDFLAGS"
427 LDFLAGS="$LDFLAGS_FOR_BUILD"
429 warn_CFLAGS_FOR_BUILD="-Wall -Wextra -Wno-unused-function"
430 saved_CFLAGS="$CFLAGS"
431 CFLAGS="$warn_CFLAGS_FOR_BUILD $CFLAGS"
432 AC_MSG_CHECKING([if native ${CC_FOR_BUILD} supports ${warn_CFLAGS_FOR_BUILD}])
433 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
434 [ AC_MSG_RESULT([yes]) ],
435 [ AC_MSG_RESULT([no])
436 CFLAGS="$saved_CFLAGS"
439 AC_MSG_CHECKING([for working native compiler: ${CC_FOR_BUILD}])
441 [AC_LANG_PROGRAM([], [])],
442 [working_native_cc=yes],
443 [working_native_cc=no],[:])
445 CFLAGS_FOR_BUILD="$CFLAGS"
447 # Restore the environment
448 cross_compiling=$save_cross_compiling
450 CFLAGS="$SAVE_CFLAGS"
451 CPPFLAGS="$SAVE_CPPFLAGS"
452 LDFLAGS="$SAVE_LDFLAGS"
454 if test x"$working_native_cc" = x"no"; then
457 m4_define([please_set_for_build], [Please set CC_FOR_BUILD, CFLAGS_FOR_BUILD, CPPFLAGS_FOR_BUILD, and/or LDFLAGS_FOR_BUILD.])
458 if test x"$use_ecmult_static_precomputation" = x"yes"; then
459 AC_MSG_ERROR([native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
461 AC_MSG_WARN([Disabling statically generated ecmult table because the native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
469 AC_SUBST(CC_FOR_BUILD)
470 AC_SUBST(CFLAGS_FOR_BUILD)
471 AC_SUBST(CPPFLAGS_FOR_BUILD)
472 AC_SUBST(LDFLAGS_FOR_BUILD)
477 if test x"$set_precomp" = x"yes"; then
478 AC_DEFINE(USE_ECMULT_STATIC_PRECOMPUTATION, 1, [Define this symbol to use a statically generated ecmult table])
482 ### Handle module options
485 if test x"$enable_module_ecdh" = x"yes"; then
486 AC_DEFINE(ENABLE_MODULE_ECDH, 1, [Define this symbol to enable the ECDH module])
489 if test x"$enable_module_recovery" = x"yes"; then
490 AC_DEFINE(ENABLE_MODULE_RECOVERY, 1, [Define this symbol to enable the ECDSA pubkey recovery module])
493 if test x"$enable_module_schnorrsig" = x"yes"; then
494 AC_DEFINE(ENABLE_MODULE_SCHNORRSIG, 1, [Define this symbol to enable the schnorrsig module])
495 enable_module_extrakeys=yes
498 # Test if extrakeys is set after the schnorrsig module to allow the schnorrsig
499 # module to set enable_module_extrakeys=yes
500 if test x"$enable_module_extrakeys" = x"yes"; then
501 AC_DEFINE(ENABLE_MODULE_EXTRAKEYS, 1, [Define this symbol to enable the extrakeys module])
504 if test x"$use_external_default_callbacks" = x"yes"; then
505 AC_DEFINE(USE_EXTERNAL_DEFAULT_CALLBACKS, 1, [Define this symbol if an external implementation of the default callbacks is used])
509 ### Check for --enable-experimental if necessary
512 if test x"$enable_experimental" = x"yes"; then
513 AC_MSG_NOTICE([******])
514 AC_MSG_NOTICE([WARNING: experimental build])
515 AC_MSG_NOTICE([Experimental features do not have stable APIs or properties, and may not be safe for production use.])
516 AC_MSG_NOTICE([Building extrakeys module: $enable_module_extrakeys])
517 AC_MSG_NOTICE([Building schnorrsig module: $enable_module_schnorrsig])
518 AC_MSG_NOTICE([******])
520 if test x"$enable_module_extrakeys" = x"yes"; then
521 AC_MSG_ERROR([extrakeys module is experimental. Use --enable-experimental to allow.])
523 if test x"$enable_module_schnorrsig" = x"yes"; then
524 AC_MSG_ERROR([schnorrsig module is experimental. Use --enable-experimental to allow.])
526 if test x"$set_asm" = x"arm"; then
527 AC_MSG_ERROR([ARM assembly optimization is experimental. Use --enable-experimental to allow.])
535 AC_CONFIG_HEADERS([src/libsecp256k1-config.h])
536 AC_CONFIG_FILES([Makefile libsecp256k1.pc])
537 AC_SUBST(SECP_INCLUDES)
539 AC_SUBST(SECP_TEST_LIBS)
540 AC_SUBST(SECP_TEST_INCLUDES)
541 AM_CONDITIONAL([ENABLE_COVERAGE], [test x"$enable_coverage" = x"yes"])
542 AM_CONDITIONAL([USE_TESTS], [test x"$use_tests" != x"no"])
543 AM_CONDITIONAL([USE_EXHAUSTIVE_TESTS], [test x"$use_exhaustive_tests" != x"no"])
544 AM_CONDITIONAL([USE_BENCHMARK], [test x"$use_benchmark" = x"yes"])
545 AM_CONDITIONAL([USE_ECMULT_STATIC_PRECOMPUTATION], [test x"$set_precomp" = x"yes"])
546 AM_CONDITIONAL([ENABLE_MODULE_ECDH], [test x"$enable_module_ecdh" = x"yes"])
547 AM_CONDITIONAL([ENABLE_MODULE_RECOVERY], [test x"$enable_module_recovery" = x"yes"])
548 AM_CONDITIONAL([ENABLE_MODULE_EXTRAKEYS], [test x"$enable_module_extrakeys" = x"yes"])
549 AM_CONDITIONAL([ENABLE_MODULE_SCHNORRSIG], [test x"$enable_module_schnorrsig" = x"yes"])
550 AM_CONDITIONAL([USE_EXTERNAL_ASM], [test x"$use_external_asm" = x"yes"])
551 AM_CONDITIONAL([USE_ASM_ARM], [test x"$set_asm" = x"arm"])
553 # Make sure nothing new is exported so that we don't break the cache.
554 PKGCONFIG_PATH_TEMP="$PKG_CONFIG_PATH"
555 unset PKG_CONFIG_PATH
556 PKG_CONFIG_PATH="$PKGCONFIG_PATH_TEMP"
561 echo "Build Options:"
562 echo " with ecmult precomp = $set_precomp"
563 echo " with external callbacks = $use_external_default_callbacks"
564 echo " with benchmarks = $use_benchmark"
565 echo " with tests = $use_tests"
566 echo " with openssl tests = $enable_openssl_tests"
567 echo " with coverage = $enable_coverage"
568 echo " module ecdh = $enable_module_ecdh"
569 echo " module recovery = $enable_module_recovery"
570 echo " module extrakeys = $enable_module_extrakeys"
571 echo " module schnorrsig = $enable_module_schnorrsig"
573 echo " asm = $set_asm"
574 echo " bignum = $set_bignum"
575 echo " ecmult window size = $set_ecmult_window"
576 echo " ecmult gen prec. bits = $set_ecmult_gen_precision"
577 # Hide test-only options unless they're used.
578 if test x"$set_widemul" != xauto; then
579 echo " wide multiplication = $set_widemul"
582 echo " valgrind = $enable_valgrind"
584 echo " CFLAGS = $CFLAGS"
585 echo " CPPFLAGS = $CPPFLAGS"
586 echo " LDFLAGS = $LDFLAGS"
588 if test x"$set_precomp" = x"yes"; then
589 echo " CC_FOR_BUILD = $CC_FOR_BUILD"
590 echo " CFLAGS_FOR_BUILD = $CFLAGS_FOR_BUILD"
591 echo " CPPFLAGS_FOR_BUILD = $CPPFLAGS_FOR_BUILD"
592 echo " LDFLAGS_FOR_BUILD = $LDFLAGS_FOR_BUILD"