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 valgrind_prefix=`$BREW --prefix valgrind 2>/dev/null`
52 if test x$openssl_prefix != x; then
53 PKG_CONFIG_PATH="$openssl_prefix/lib/pkgconfig:$PKG_CONFIG_PATH"
54 export PKG_CONFIG_PATH
55 CRYPTO_CPPFLAGS="-I$openssl_prefix/include"
57 if test x$valgrind_prefix != x; then
58 VALGRIND_CPPFLAGS="-I$valgrind_prefix/include"
61 AC_PATH_PROG([PORT],port,)
62 # If homebrew isn't installed and macports is, add the macports default paths
64 if test x$PORT != x; then
65 CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
66 LDFLAGS="$LDFLAGS -L/opt/local/lib"
73 # Try if some desirable compiler flags are supported and append them to SECP_CFLAGS.
75 # These are our own flags, so we append them to our own SECP_CFLAGS variable (instead of CFLAGS) as
76 # recommended in the automake manual (Section "Flag Variables Ordering"). CFLAGS belongs to the user
77 # and we are not supposed to touch it. In the Makefile, we will need to ensure that SECP_CFLAGS
78 # is prepended to CFLAGS when invoking the compiler so that the user always has the last word (flag).
80 # Another advantage of not touching CFLAGS is that the contents of CFLAGS will be picked up by
81 # libtool for compiling helper executables. For example, when compiling for Windows, libtool will
82 # generate entire wrapper executables (instead of simple wrapper scripts as on Unix) to ensure
83 # proper operation of uninstalled programs linked by libtool against the uninstalled shared library.
84 # These executables are compiled from C source file for which our flags may not be appropriate,
85 # e.g., -std=c89 flag has lead to undesirable warnings in the past.
87 # TODO We still touch the CFLAGS for --coverage and -O0/-O2.
88 # TODO We should analogously not touch CPPFLAGS and LDFLAGS but currently there are no issues.
89 AC_DEFUN([SECP_TRY_APPEND_DEFAULT_CFLAGS], [
90 # Try to append -Werror=unknown-warning-option to CFLAGS temporarily. Otherwise clang will
91 # not error out if it gets unknown warning flags and the checks here will always succeed
92 # no matter if clang knows the flag or not.
93 SECP_TRY_APPEND_DEFAULT_CFLAGS_saved_CFLAGS="$CFLAGS"
94 SECP_TRY_APPEND_CFLAGS([-Werror=unknown-warning-option], CFLAGS)
96 SECP_TRY_APPEND_CFLAGS([-std=c89 -pedantic -Wno-long-long -Wnested-externs -Wshadow -Wstrict-prototypes -Wundef], $1) # GCC >= 3.0, -Wlong-long is implied by -pedantic.
97 SECP_TRY_APPEND_CFLAGS([-Wno-overlength-strings], $1) # GCC >= 4.2, -Woverlength-strings is implied by -pedantic.
98 SECP_TRY_APPEND_CFLAGS([-Wall], $1) # GCC >= 2.95 and probably many other compilers
99 SECP_TRY_APPEND_CFLAGS([-Wno-unused-function], $1) # GCC >= 3.0, -Wunused-function is implied by -Wall.
100 SECP_TRY_APPEND_CFLAGS([-Wextra], $1) # GCC >= 3.4, this is the newer name of -W, which we don't use because older GCCs will warn about unused functions.
101 SECP_TRY_APPEND_CFLAGS([-Wcast-align], $1) # GCC >= 2.95
102 SECP_TRY_APPEND_CFLAGS([-Wcast-align=strict], $1) # GCC >= 8.0
103 SECP_TRY_APPEND_CFLAGS([-Wconditional-uninitialized], $1) # Clang >= 3.0 only
104 SECP_TRY_APPEND_CFLAGS([-fvisibility=hidden], $1) # GCC >= 4.0
106 CFLAGS="$SECP_TRY_APPEND_DEFAULT_CFLAGS_saved_CFLAGS"
108 SECP_TRY_APPEND_DEFAULT_CFLAGS(SECP_CFLAGS)
111 ### Define config arguments
114 AC_ARG_ENABLE(benchmark,
115 AS_HELP_STRING([--enable-benchmark],[compile benchmark [default=yes]]),
116 [use_benchmark=$enableval],
119 AC_ARG_ENABLE(coverage,
120 AS_HELP_STRING([--enable-coverage],[enable compiler flags to support kcov coverage analysis [default=no]]),
121 [enable_coverage=$enableval],
122 [enable_coverage=no])
125 AS_HELP_STRING([--enable-tests],[compile tests [default=yes]]),
126 [use_tests=$enableval],
129 AC_ARG_ENABLE(openssl_tests,
130 AS_HELP_STRING([--enable-openssl-tests],[enable OpenSSL tests [default=auto]]),
131 [enable_openssl_tests=$enableval],
132 [enable_openssl_tests=auto])
134 AC_ARG_ENABLE(experimental,
135 AS_HELP_STRING([--enable-experimental],[allow experimental configure options [default=no]]),
136 [use_experimental=$enableval],
137 [use_experimental=no])
139 AC_ARG_ENABLE(exhaustive_tests,
140 AS_HELP_STRING([--enable-exhaustive-tests],[compile exhaustive tests [default=yes]]),
141 [use_exhaustive_tests=$enableval],
142 [use_exhaustive_tests=yes])
144 AC_ARG_ENABLE(ecmult_static_precomputation,
145 AS_HELP_STRING([--enable-ecmult-static-precomputation],[enable precomputed ecmult table for signing [default=auto]]),
146 [use_ecmult_static_precomputation=$enableval],
147 [use_ecmult_static_precomputation=auto])
149 AC_ARG_ENABLE(module_ecdh,
150 AS_HELP_STRING([--enable-module-ecdh],[enable ECDH shared secret computation]),
151 [enable_module_ecdh=$enableval],
152 [enable_module_ecdh=no])
154 AC_ARG_ENABLE(module_recovery,
155 AS_HELP_STRING([--enable-module-recovery],[enable ECDSA pubkey recovery module [default=no]]),
156 [enable_module_recovery=$enableval],
157 [enable_module_recovery=no])
159 AC_ARG_ENABLE(module_extrakeys,
160 AS_HELP_STRING([--enable-module-extrakeys],[enable extrakeys module (experimental)]),
161 [enable_module_extrakeys=$enableval],
162 [enable_module_extrakeys=no])
164 AC_ARG_ENABLE(module_schnorrsig,
165 AS_HELP_STRING([--enable-module-schnorrsig],[enable schnorrsig module (experimental)]),
166 [enable_module_schnorrsig=$enableval],
167 [enable_module_schnorrsig=no])
169 AC_ARG_ENABLE(external_default_callbacks,
170 AS_HELP_STRING([--enable-external-default-callbacks],[enable external default callback functions [default=no]]),
171 [use_external_default_callbacks=$enableval],
172 [use_external_default_callbacks=no])
174 # Test-only override of the (autodetected by the C code) "widemul" setting.
175 # Legal values are int64 (for [u]int64_t), int128 (for [unsigned] __int128), and auto (the default).
176 AC_ARG_WITH([test-override-wide-multiply], [] ,[set_widemul=$withval], [set_widemul=auto])
178 AC_ARG_WITH([asm], [AS_HELP_STRING([--with-asm=x86_64|arm|no|auto],
179 [assembly optimizations to useĀ (experimental: arm) [default=auto]])],[req_asm=$withval], [req_asm=auto])
181 AC_ARG_WITH([ecmult-window], [AS_HELP_STRING([--with-ecmult-window=SIZE|auto],
182 [window size for ecmult precomputation for verification, specified as integer in range [2..24].]
183 [Larger values result in possibly better performance at the cost of an exponentially larger precomputed table.]
184 [The table will store 2^(SIZE-1) * 64 bytes of data but can be larger in memory due to platform-specific padding and alignment.]
185 ["auto" is a reasonable setting for desktop machines (currently 15). [default=auto]]
187 [req_ecmult_window=$withval], [req_ecmult_window=auto])
189 AC_ARG_WITH([ecmult-gen-precision], [AS_HELP_STRING([--with-ecmult-gen-precision=2|4|8|auto],
190 [Precision bits to tune the precomputed table size for signing.]
191 [The size of the table is 32kB for 2 bits, 64kB for 4 bits, 512kB for 8 bits of precision.]
192 [A larger table size usually results in possible faster signing.]
193 ["auto" is a reasonable setting for desktop machines (currently 4). [default=auto]]
195 [req_ecmult_gen_precision=$withval], [req_ecmult_gen_precision=auto])
197 AC_ARG_WITH([valgrind], [AS_HELP_STRING([--with-valgrind=yes|no|auto],
198 [Build with extra checks for running inside Valgrind [default=auto]]
200 [req_valgrind=$withval], [req_valgrind=auto])
203 ### Handle config options (except for modules)
206 if test x"$req_valgrind" = x"no"; then
210 if test x"$has_valgrind" != x"yes"; then
211 if test x"$req_valgrind" = x"yes"; then
212 AC_MSG_ERROR([Valgrind support explicitly requested but valgrind/memcheck.h header not available])
219 AM_CONDITIONAL([VALGRIND_ENABLED],[test "$enable_valgrind" = "yes"])
221 if test x"$enable_coverage" = x"yes"; then
222 AC_DEFINE(COVERAGE, 1, [Define this symbol to compile out all VERIFY code])
223 CFLAGS="-O0 --coverage $CFLAGS"
224 LDFLAGS="--coverage $LDFLAGS"
229 if test x"$req_asm" = x"auto"; then
231 if test x"$has_64bit_asm" = x"yes"; then
234 if test x"$set_asm" = x; then
242 if test x"$has_64bit_asm" != x"yes"; then
243 AC_MSG_ERROR([x86_64 assembly optimization requested but not available])
251 AC_MSG_ERROR([invalid assembly optimization selection])
256 # Select assembly optimization
261 AC_DEFINE(USE_ASM_X86_64, 1, [Define this symbol to enable x86_64 assembly optimizations])
269 AC_MSG_ERROR([invalid assembly optimizations])
273 if test x"$use_external_asm" = x"yes"; then
274 AC_DEFINE(USE_EXTERNAL_ASM, 1, [Define this symbol if an external (non-inline) assembly implementation is used])
278 # Select wide multiplication implementation
281 AC_DEFINE(USE_FORCE_WIDEMUL_INT128, 1, [Define this symbol to force the use of the (unsigned) __int128 based wide multiplication implementation])
284 AC_DEFINE(USE_FORCE_WIDEMUL_INT64, 1, [Define this symbol to force the use of the (u)int64_t based wide multiplication implementation])
289 AC_MSG_ERROR([invalid wide multiplication implementation])
293 # Set ecmult window size
294 if test x"$req_ecmult_window" = x"auto"; then
297 set_ecmult_window=$req_ecmult_window
300 error_window_size=['window size for ecmult precomputation not an integer in range [2..24] or "auto"']
301 case $set_ecmult_window in
304 AC_MSG_ERROR($error_window_size)
307 if test "$set_ecmult_window" -lt 2 -o "$set_ecmult_window" -gt 24 ; then
309 AC_MSG_ERROR($error_window_size)
311 AC_DEFINE_UNQUOTED(ECMULT_WINDOW_SIZE, $set_ecmult_window, [Set window size for ecmult precomputation])
315 # Set ecmult gen precision
316 if test x"$req_ecmult_gen_precision" = x"auto"; then
317 set_ecmult_gen_precision=4
319 set_ecmult_gen_precision=$req_ecmult_gen_precision
322 case $set_ecmult_gen_precision in
324 AC_DEFINE_UNQUOTED(ECMULT_GEN_PREC_BITS, $set_ecmult_gen_precision, [Set ecmult gen precision bits])
327 AC_MSG_ERROR(['ecmult gen precision not 2, 4, 8 or "auto"'])
331 if test x"$use_tests" = x"yes"; then
333 if test x"$enable_openssl_tests" != x"no" && test x"$has_openssl_ec" = x"yes"; then
334 enable_openssl_tests=yes
335 AC_DEFINE(ENABLE_OPENSSL_TESTS, 1, [Define this symbol if OpenSSL EC functions are available])
336 SECP_TEST_INCLUDES="$SSL_CFLAGS $CRYPTO_CFLAGS $CRYPTO_CPPFLAGS"
337 SECP_TEST_LIBS="$CRYPTO_LIBS"
341 SECP_TEST_LIBS="$SECP_TEST_LIBS -lgdi32"
345 if test x"$enable_openssl_tests" = x"yes"; then
346 AC_MSG_ERROR([OpenSSL tests requested but OpenSSL with EC support is not available])
348 enable_openssl_tests=no
351 if test x"$enable_openssl_tests" = x"yes"; then
352 AC_MSG_ERROR([OpenSSL tests requested but tests are not enabled])
354 enable_openssl_tests=no
357 if test x"$enable_valgrind" = x"yes"; then
358 SECP_INCLUDES="$SECP_INCLUDES $VALGRIND_CPPFLAGS"
361 # Handle static precomputation (after everything which modifies CFLAGS and friends)
362 if test x"$use_ecmult_static_precomputation" != x"no"; then
363 if test x"$cross_compiling" = x"no"; then
365 if test x"${CC_FOR_BUILD+x}${CFLAGS_FOR_BUILD+x}${CPPFLAGS_FOR_BUILD+x}${LDFLAGS_FOR_BUILD+x}" != x; then
366 AC_MSG_WARN([CC_FOR_BUILD, CFLAGS_FOR_BUILD, CPPFLAGS_FOR_BUILD, and/or LDFLAGS_FOR_BUILD is set but ignored because we are not cross-compiling.])
368 # If we're not cross-compiling, simply use the same compiler for building the static precompation code.
370 CPPFLAGS_FOR_BUILD="$CPPFLAGS"
371 SECP_CFLAGS_FOR_BUILD="$SECP_CFLAGS"
372 CFLAGS_FOR_BUILD="$CFLAGS"
373 LDFLAGS_FOR_BUILD="$LDFLAGS"
377 # Temporarily switch to an environment for the native compiler
378 save_cross_compiling=$cross_compiling
382 SAVE_CPPFLAGS="$CPPFLAGS"
383 CPPFLAGS="$CPPFLAGS_FOR_BUILD"
384 SAVE_CFLAGS="$CFLAGS"
385 CFLAGS="$CFLAGS_FOR_BUILD"
386 SAVE_LDFLAGS="$LDFLAGS"
387 LDFLAGS="$LDFLAGS_FOR_BUILD"
389 SECP_TRY_APPEND_DEFAULT_CFLAGS(SECP_CFLAGS_FOR_BUILD)
391 AC_MSG_CHECKING([for working native compiler: ${CC_FOR_BUILD}])
393 [AC_LANG_PROGRAM([], [])],
394 [working_native_cc=yes],
395 [working_native_cc=no],[:])
397 # Restore the environment
398 cross_compiling=$save_cross_compiling
400 CPPFLAGS="$SAVE_CPPFLAGS"
401 CFLAGS="$SAVE_CFLAGS"
402 LDFLAGS="$SAVE_LDFLAGS"
404 if test x"$working_native_cc" = x"no"; then
407 m4_define([please_set_for_build], [Please set CC_FOR_BUILD, CPPFLAGS_FOR_BUILD, CFLAGS_FOR_BUILD, and/or LDFLAGS_FOR_BUILD.])
408 if test x"$use_ecmult_static_precomputation" = x"yes"; then
409 AC_MSG_ERROR([native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
411 AC_MSG_WARN([Disabling statically generated ecmult table because the native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
419 AC_SUBST(CC_FOR_BUILD)
420 AC_SUBST(CPPFLAGS_FOR_BUILD)
421 AC_SUBST(SECP_CFLAGS_FOR_BUILD)
422 AC_SUBST(CFLAGS_FOR_BUILD)
423 AC_SUBST(LDFLAGS_FOR_BUILD)
428 if test x"$set_precomp" = x"yes"; then
429 AC_DEFINE(USE_ECMULT_STATIC_PRECOMPUTATION, 1, [Define this symbol to use a statically generated ecmult table])
433 ### Handle module options
436 if test x"$enable_module_ecdh" = x"yes"; then
437 AC_DEFINE(ENABLE_MODULE_ECDH, 1, [Define this symbol to enable the ECDH module])
440 if test x"$enable_module_recovery" = x"yes"; then
441 AC_DEFINE(ENABLE_MODULE_RECOVERY, 1, [Define this symbol to enable the ECDSA pubkey recovery module])
444 if test x"$enable_module_schnorrsig" = x"yes"; then
445 AC_DEFINE(ENABLE_MODULE_SCHNORRSIG, 1, [Define this symbol to enable the schnorrsig module])
446 enable_module_extrakeys=yes
449 # Test if extrakeys is set after the schnorrsig module to allow the schnorrsig
450 # module to set enable_module_extrakeys=yes
451 if test x"$enable_module_extrakeys" = x"yes"; then
452 AC_DEFINE(ENABLE_MODULE_EXTRAKEYS, 1, [Define this symbol to enable the extrakeys module])
455 if test x"$use_external_default_callbacks" = x"yes"; then
456 AC_DEFINE(USE_EXTERNAL_DEFAULT_CALLBACKS, 1, [Define this symbol if an external implementation of the default callbacks is used])
460 ### Check for --enable-experimental if necessary
463 if test x"$enable_experimental" = x"yes"; then
464 AC_MSG_NOTICE([******])
465 AC_MSG_NOTICE([WARNING: experimental build])
466 AC_MSG_NOTICE([Experimental features do not have stable APIs or properties, and may not be safe for production use.])
467 AC_MSG_NOTICE([Building extrakeys module: $enable_module_extrakeys])
468 AC_MSG_NOTICE([Building schnorrsig module: $enable_module_schnorrsig])
469 AC_MSG_NOTICE([******])
471 if test x"$enable_module_extrakeys" = x"yes"; then
472 AC_MSG_ERROR([extrakeys module is experimental. Use --enable-experimental to allow.])
474 if test x"$enable_module_schnorrsig" = x"yes"; then
475 AC_MSG_ERROR([schnorrsig module is experimental. Use --enable-experimental to allow.])
477 if test x"$set_asm" = x"arm"; then
478 AC_MSG_ERROR([ARM assembly optimization is experimental. Use --enable-experimental to allow.])
486 AC_CONFIG_HEADERS([src/libsecp256k1-config.h])
487 AC_CONFIG_FILES([Makefile libsecp256k1.pc])
488 AC_SUBST(SECP_INCLUDES)
490 AC_SUBST(SECP_TEST_LIBS)
491 AC_SUBST(SECP_TEST_INCLUDES)
492 AC_SUBST(SECP_CFLAGS)
493 AM_CONDITIONAL([ENABLE_COVERAGE], [test x"$enable_coverage" = x"yes"])
494 AM_CONDITIONAL([USE_TESTS], [test x"$use_tests" != x"no"])
495 AM_CONDITIONAL([USE_EXHAUSTIVE_TESTS], [test x"$use_exhaustive_tests" != x"no"])
496 AM_CONDITIONAL([USE_BENCHMARK], [test x"$use_benchmark" = x"yes"])
497 AM_CONDITIONAL([USE_ECMULT_STATIC_PRECOMPUTATION], [test x"$set_precomp" = x"yes"])
498 AM_CONDITIONAL([ENABLE_MODULE_ECDH], [test x"$enable_module_ecdh" = x"yes"])
499 AM_CONDITIONAL([ENABLE_MODULE_RECOVERY], [test x"$enable_module_recovery" = x"yes"])
500 AM_CONDITIONAL([ENABLE_MODULE_EXTRAKEYS], [test x"$enable_module_extrakeys" = x"yes"])
501 AM_CONDITIONAL([ENABLE_MODULE_SCHNORRSIG], [test x"$enable_module_schnorrsig" = x"yes"])
502 AM_CONDITIONAL([USE_EXTERNAL_ASM], [test x"$use_external_asm" = x"yes"])
503 AM_CONDITIONAL([USE_ASM_ARM], [test x"$set_asm" = x"arm"])
505 # Make sure nothing new is exported so that we don't break the cache.
506 PKGCONFIG_PATH_TEMP="$PKG_CONFIG_PATH"
507 unset PKG_CONFIG_PATH
508 PKG_CONFIG_PATH="$PKGCONFIG_PATH_TEMP"
513 echo "Build Options:"
514 echo " with ecmult precomp = $set_precomp"
515 echo " with external callbacks = $use_external_default_callbacks"
516 echo " with benchmarks = $use_benchmark"
517 echo " with tests = $use_tests"
518 echo " with openssl tests = $enable_openssl_tests"
519 echo " with coverage = $enable_coverage"
520 echo " module ecdh = $enable_module_ecdh"
521 echo " module recovery = $enable_module_recovery"
522 echo " module extrakeys = $enable_module_extrakeys"
523 echo " module schnorrsig = $enable_module_schnorrsig"
525 echo " asm = $set_asm"
526 echo " ecmult window size = $set_ecmult_window"
527 echo " ecmult gen prec. bits = $set_ecmult_gen_precision"
528 # Hide test-only options unless they're used.
529 if test x"$set_widemul" != xauto; then
530 echo " wide multiplication = $set_widemul"
533 echo " valgrind = $enable_valgrind"
535 echo " CPPFLAGS = $CPPFLAGS"
536 echo " SECP_CFLAGS = $SECP_CFLAGS"
537 echo " CFLAGS = $CFLAGS"
538 echo " LDFLAGS = $LDFLAGS"
540 if test x"$set_precomp" = x"yes"; then
541 echo " CC_FOR_BUILD = $CC_FOR_BUILD"
542 echo " CPPFLAGS_FOR_BUILD = $CPPFLAGS_FOR_BUILD"
543 echo " SECP_CFLAGS_FOR_BUILD = $SECP_CFLAGS_FOR_BUILD"
544 echo " CFLAGS_FOR_BUILD = $CFLAGS_FOR_BUILD"
545 echo " LDFLAGS_FOR_BUILD = $LDFLAGS_FOR_BUILD"