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Merge bitcoin#862: Autoconf improvements
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3c15130 Improve CC_FOR_BUILD detection (Tim Ruffing)
47802a4 Restructure and tidy configure.ac (Tim Ruffing)
252c19d Ask brew for valgrind include path (Tim Ruffing)

Pull request description:

  See individual commit messages. These are improvements in preparation of the switch to Cirrus CI. (Maybe I'll just open a PR on top of this one.)

  The first commit made the difference between successful build https://cirrus-ci.com/task/6740575057608704 and unsuccessful build https://cirrus-ci.com/task/4909571074424832.

  I've tested the second commit without cross-compilation and with cross-compilation for android (bitcoin-core/secp256k1#621 (comment))

  When working on the autoconf stuff, I noticed two things that I just want to write down here:
   - At some point we should update [build-aux/m4/ax_prog_cc_for_build.m4](https://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html). This is outdated, and [there have been a lot of fixes](autoconf-archive/autoconf-archive#207) But the latest version is [broken](https://lists.gnu.org/archive/html/autoconf-archive-maintainers/2020-06/msg00002.html), so now is probably not the time.
   - The latest autoconf 2.70 deprecates `AC_PROG_CC_C89`. It's not needed anymore because `AC_PROG_CC` cares about testing for version support. This makes autoconf 2.70 output a warning that we should probably just ignore. We don't want to force users onto 2.70...

ACKs for top commit:
  sipa:
    utACK 3c15130
  jonasnick:
    utACK 3c15130 makes sense (with my very basic understanding of autoconf)

Tree-SHA512: 595b9de316374c2213f1340cddaa22eb3190b01fa99aa6ae26e77804df41e7ecf96a09e03c28e8f8b9fd04e211e4ee2f78f1e5a7995143c84f99d2e16d4f0260
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real-or-random committed Jan 12, 2021
2 parents 328aaef + 3c15130 commit f2d9aea
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Showing 3 changed files with 144 additions and 80 deletions.
8 changes: 8 additions & 0 deletions build-aux/m4/bitcoin_secp.m4
View file
Expand Up @@ -87,3 +87,11 @@ if test x"$has_gmp" != x"yes"; then
LIBS="$LIBS_TEMP"
fi
])

AC_DEFUN([SECP_VALGRIND_CHECK],[
if test x"$has_valgrind" != x"yes"; then
CPPFLAGS_TEMP="$CPPFLAGS"
CPPFLAGS="$VALGRIND_CPPFLAGS $CPPFLAGS"
AC_CHECK_HEADER([valgrind/memcheck.h], [has_valgrind=yes; AC_DEFINE(HAVE_VALGRIND,1,[Define this symbol if valgrind is installed])])
fi
])
212 changes: 134 additions & 78 deletions configure.ac
View file
Expand Up @@ -14,15 +14,14 @@ AM_INIT_AUTOMAKE([foreign subdir-objects])
: ${CFLAGS="-g"}
LT_INIT

dnl make the compilation flags quiet unless V=1 is used
# Make the compilation flags quiet unless V=1 is used.
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

PKG_PROG_PKG_CONFIG

AC_PATH_TOOL(AR, ar)
AC_PATH_TOOL(RANLIB, ranlib)
AC_PATH_TOOL(STRIP, strip)
AX_PROG_CC_FOR_BUILD

AM_PROG_CC_C_O

Expand All @@ -37,12 +36,12 @@ case $host_os in
if test x$cross_compiling != xyes; then
AC_PATH_PROG([BREW],brew,)
if test x$BREW != x; then
dnl These Homebrew packages may be keg-only, meaning that they won't be found
dnl in expected paths because they may conflict with system files. Ask
dnl Homebrew where each one is located, then adjust paths accordingly.

# These Homebrew packages may be keg-only, meaning that they won't be found
# in expected paths because they may conflict with system files. Ask
# Homebrew where each one is located, then adjust paths accordingly.
openssl_prefix=`$BREW --prefix openssl 2>/dev/null`
gmp_prefix=`$BREW --prefix gmp 2>/dev/null`
valgrind_prefix=`$BREW --prefix valgrind 2>/dev/null`
if test x$openssl_prefix != x; then
PKG_CONFIG_PATH="$openssl_prefix/lib/pkgconfig:$PKG_CONFIG_PATH"
export PKG_CONFIG_PATH
Expand All @@ -52,10 +51,13 @@ case $host_os in
GMP_CPPFLAGS="-I$gmp_prefix/include"
GMP_LIBS="-L$gmp_prefix/lib"
fi
if test x$valgrind_prefix != x; then
VALGRIND_CPPFLAGS="-I$valgrind_prefix/include"
fi
else
AC_PATH_PROG([PORT],port,)
dnl if homebrew isn't installed and macports is, add the macports default paths
dnl as a last resort.
# If homebrew isn't installed and macports is, add the macports default paths
# as a last resort.
if test x$PORT != x; then
CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
LDFLAGS="$LDFLAGS -L/opt/local/lib"
Expand Down Expand Up @@ -86,6 +88,10 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
CFLAGS="$saved_CFLAGS"
])

###
### Define config arguments
###

AC_ARG_ENABLE(benchmark,
AS_HELP_STRING([--enable-benchmark],[compile benchmark [default=yes]]),
[use_benchmark=$enableval],
Expand Down Expand Up @@ -146,8 +152,8 @@ AC_ARG_ENABLE(external_default_callbacks,
[use_external_default_callbacks=$enableval],
[use_external_default_callbacks=no])

dnl Test-only override of the (autodetected by the C code) "widemul" setting.
dnl Legal values are int64 (for [u]int64_t), int128 (for [unsigned] __int128), and auto (the default).
# Test-only override of the (autodetected by the C code) "widemul" setting.
# Legal values are int64 (for [u]int64_t), int128 (for [unsigned] __int128), and auto (the default).
AC_ARG_WITH([test-override-wide-multiply], [] ,[set_widemul=$withval], [set_widemul=auto])

AC_ARG_WITH([bignum], [AS_HELP_STRING([--with-bignum=gmp|no|auto],
Expand Down Expand Up @@ -177,15 +183,22 @@ AC_ARG_WITH([valgrind], [AS_HELP_STRING([--with-valgrind=yes|no|auto],
)],
[req_valgrind=$withval], [req_valgrind=auto])

###
### Handle config options (except for modules)
###

if test x"$req_valgrind" = x"no"; then
enable_valgrind=no
else
AC_CHECK_HEADER([valgrind/memcheck.h], [enable_valgrind=yes], [
SECP_VALGRIND_CHECK
if test x"$has_valgrind" != x"yes"; then
if test x"$req_valgrind" = x"yes"; then
AC_MSG_ERROR([Valgrind support explicitly requested but valgrind/memcheck.h header not available])
fi
enable_valgrind=no
], [])
else
enable_valgrind=yes
fi
fi
AM_CONDITIONAL([VALGRIND_ENABLED],[test "$enable_valgrind" = "yes"])

Expand All @@ -197,61 +210,6 @@ else
CFLAGS="-O2 $CFLAGS"
fi

if test x"$use_ecmult_static_precomputation" != x"no"; then
# Temporarily switch to an environment for the native compiler
save_cross_compiling=$cross_compiling
cross_compiling=no
SAVE_CC="$CC"
CC="$CC_FOR_BUILD"
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS_FOR_BUILD"
SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS_FOR_BUILD"
SAVE_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS_FOR_BUILD"

warn_CFLAGS_FOR_BUILD="-Wall -Wextra -Wno-unused-function"
saved_CFLAGS="$CFLAGS"
CFLAGS="$warn_CFLAGS_FOR_BUILD $CFLAGS"
AC_MSG_CHECKING([if native ${CC_FOR_BUILD} supports ${warn_CFLAGS_FOR_BUILD}])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
[ AC_MSG_RESULT([yes]) ],
[ AC_MSG_RESULT([no])
CFLAGS="$saved_CFLAGS"
])

AC_MSG_CHECKING([for working native compiler: ${CC_FOR_BUILD}])
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([], [])],
[working_native_cc=yes],
[working_native_cc=no],[:])

CFLAGS_FOR_BUILD="$CFLAGS"

# Restore the environment
cross_compiling=$save_cross_compiling
CC="$SAVE_CC"
CFLAGS="$SAVE_CFLAGS"
CPPFLAGS="$SAVE_CPPFLAGS"
LDFLAGS="$SAVE_LDFLAGS"

if test x"$working_native_cc" = x"no"; then
AC_MSG_RESULT([no])
set_precomp=no
m4_define([please_set_for_build], [Please set CC_FOR_BUILD, CFLAGS_FOR_BUILD, CPPFLAGS_FOR_BUILD, and/or LDFLAGS_FOR_BUILD.])
if test x"$use_ecmult_static_precomputation" = x"yes"; then
AC_MSG_ERROR([native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
else
AC_MSG_WARN([Disabling statically generated ecmult table because the native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
fi
else
AC_MSG_RESULT([yes])
set_precomp=yes
fi
else
set_precomp=no
fi

if test x"$req_asm" = x"auto"; then
SECP_64BIT_ASM_CHECK
if test x"$has_64bit_asm" = x"yes"; then
Expand Down Expand Up @@ -305,7 +263,7 @@ else
esac
fi

# select assembly optimization
# Select assembly optimization
use_external_asm=no

case $set_asm in
Expand All @@ -322,7 +280,12 @@ no)
;;
esac

# select wide multiplication implementation
if test x"$use_external_asm" = x"yes"; then
AC_DEFINE(USE_EXTERNAL_ASM, 1, [Define this symbol if an external (non-inline) assembly implementation is used])
fi


# Select wide multiplication implementation
case $set_widemul in
int128)
AC_DEFINE(USE_FORCE_WIDEMUL_INT128, 1, [Define this symbol to force the use of the (unsigned) __int128 based wide multiplication implementation])
Expand All @@ -337,7 +300,7 @@ auto)
;;
esac

# select bignum implementation
# Select bignum implementation
case $set_bignum in
gmp)
AC_DEFINE(HAVE_LIBGMP, 1, [Define this symbol if libgmp is installed])
Expand All @@ -355,7 +318,7 @@ no)
;;
esac

#set ecmult window size
# Set ecmult window size
if test x"$req_ecmult_window" = x"auto"; then
set_ecmult_window=15
else
Expand All @@ -377,7 +340,7 @@ case $set_ecmult_window in
;;
esac

#set ecmult gen precision
# Set ecmult gen precision
if test x"$req_ecmult_gen_precision" = x"auto"; then
set_ecmult_gen_precision=4
else
Expand Down Expand Up @@ -424,10 +387,93 @@ if test x"$set_bignum" = x"gmp"; then
SECP_INCLUDES="$SECP_INCLUDES $GMP_CPPFLAGS"
fi

if test x"$enable_valgrind" = x"yes"; then
SECP_INCLUDES="$SECP_INCLUDES $VALGRIND_CPPFLAGS"
fi

# Handle static precomputation (after everything which modifies CFLAGS and friends)
if test x"$use_ecmult_static_precomputation" != x"no"; then
if test x"$cross_compiling" = x"no"; then
set_precomp=yes
if test x"${CC_FOR_BUILD+x}${CFLAGS_FOR_BUILD+x}${CPPFLAGS_FOR_BUILD+x}${LDFLAGS_FOR_BUILD+x}" != x; then
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.])
fi
# If we're not cross-compiling, simply use the same compiler for building the static precompation code.
CC_FOR_BUILD="$CC"
CFLAGS_FOR_BUILD="$CFLAGS"
CPPFLAGS_FOR_BUILD="$CPPFLAGS"
LDFLAGS_FOR_BUILD="$LDFLAGS"
else
AX_PROG_CC_FOR_BUILD

# Temporarily switch to an environment for the native compiler
save_cross_compiling=$cross_compiling
cross_compiling=no
SAVE_CC="$CC"
CC="$CC_FOR_BUILD"
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS_FOR_BUILD"
SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS_FOR_BUILD"
SAVE_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS_FOR_BUILD"

warn_CFLAGS_FOR_BUILD="-Wall -Wextra -Wno-unused-function"
saved_CFLAGS="$CFLAGS"
CFLAGS="$warn_CFLAGS_FOR_BUILD $CFLAGS"
AC_MSG_CHECKING([if native ${CC_FOR_BUILD} supports ${warn_CFLAGS_FOR_BUILD}])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
[ AC_MSG_RESULT([yes]) ],
[ AC_MSG_RESULT([no])
CFLAGS="$saved_CFLAGS"
])

AC_MSG_CHECKING([for working native compiler: ${CC_FOR_BUILD}])
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([], [])],
[working_native_cc=yes],
[working_native_cc=no],[:])

CFLAGS_FOR_BUILD="$CFLAGS"

# Restore the environment
cross_compiling=$save_cross_compiling
CC="$SAVE_CC"
CFLAGS="$SAVE_CFLAGS"
CPPFLAGS="$SAVE_CPPFLAGS"
LDFLAGS="$SAVE_LDFLAGS"

if test x"$working_native_cc" = x"no"; then
AC_MSG_RESULT([no])
set_precomp=no
m4_define([please_set_for_build], [Please set CC_FOR_BUILD, CFLAGS_FOR_BUILD, CPPFLAGS_FOR_BUILD, and/or LDFLAGS_FOR_BUILD.])
if test x"$use_ecmult_static_precomputation" = x"yes"; then
AC_MSG_ERROR([native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
else
AC_MSG_WARN([Disabling statically generated ecmult table because the native compiler ${CC_FOR_BUILD} does not produce working binaries. please_set_for_build])
fi
else
AC_MSG_RESULT([yes])
set_precomp=yes
fi
fi

AC_SUBST(CC_FOR_BUILD)
AC_SUBST(CFLAGS_FOR_BUILD)
AC_SUBST(CPPFLAGS_FOR_BUILD)
AC_SUBST(LDFLAGS_FOR_BUILD)
else
set_precomp=no
fi

if test x"$set_precomp" = x"yes"; then
AC_DEFINE(USE_ECMULT_STATIC_PRECOMPUTATION, 1, [Define this symbol to use a statically generated ecmult table])
fi

###
### Handle module options
###

if test x"$enable_module_ecdh" = x"yes"; then
AC_DEFINE(ENABLE_MODULE_ECDH, 1, [Define this symbol to enable the ECDH module])
fi
Expand All @@ -447,14 +493,14 @@ if test x"$enable_module_extrakeys" = x"yes"; then
AC_DEFINE(ENABLE_MODULE_EXTRAKEYS, 1, [Define this symbol to enable the extrakeys module])
fi

if test x"$use_external_asm" = x"yes"; then
AC_DEFINE(USE_EXTERNAL_ASM, 1, [Define this symbol if an external (non-inline) assembly implementation is used])
fi

if test x"$use_external_default_callbacks" = x"yes"; then
AC_DEFINE(USE_EXTERNAL_DEFAULT_CALLBACKS, 1, [Define this symbol if an external implementation of the default callbacks is used])
fi

###
### Check for --enable-experimental if necessary
###

if test x"$enable_experimental" = x"yes"; then
AC_MSG_NOTICE([******])
AC_MSG_NOTICE([WARNING: experimental build])
Expand All @@ -474,6 +520,10 @@ else
fi
fi

###
### Generate output
###

AC_CONFIG_HEADERS([src/libsecp256k1-config.h])
AC_CONFIG_FILES([Makefile libsecp256k1.pc])
AC_SUBST(SECP_INCLUDES)
Expand All @@ -492,7 +542,7 @@ AM_CONDITIONAL([ENABLE_MODULE_SCHNORRSIG], [test x"$enable_module_schnorrsig" =
AM_CONDITIONAL([USE_EXTERNAL_ASM], [test x"$use_external_asm" = x"yes"])
AM_CONDITIONAL([USE_ASM_ARM], [test x"$set_asm" = x"arm"])

dnl make sure nothing new is exported so that we don't break the cache
# Make sure nothing new is exported so that we don't break the cache.
PKGCONFIG_PATH_TEMP="$PKG_CONFIG_PATH"
unset PKG_CONFIG_PATH
PKG_CONFIG_PATH="$PKGCONFIG_PATH_TEMP"
Expand All @@ -516,7 +566,7 @@ echo " asm = $set_asm"
echo " bignum = $set_bignum"
echo " ecmult window size = $set_ecmult_window"
echo " ecmult gen prec. bits = $set_ecmult_gen_precision"
dnl Hide test-only options unless they're used.
# Hide test-only options unless they're used.
if test x"$set_widemul" != xauto; then
echo " wide multiplication = $set_widemul"
fi
Expand All @@ -527,3 +577,9 @@ echo " CFLAGS = $CFLAGS"
echo " CPPFLAGS = $CPPFLAGS"
echo " LDFLAGS = $LDFLAGS"
echo
if test x"$set_precomp" = x"yes"; then
echo " CC_FOR_BUILD = $CC_FOR_BUILD"
echo " CFLAGS_FOR_BUILD = $CFLAGS_FOR_BUILD"
echo " CPPFLAGS_FOR_BUILD = $CPPFLAGS_FOR_BUILD"
echo " LDFLAGS_FOR_BUILD = $LDFLAGS_FOR_BUILD"
fi
4 changes: 2 additions & 2 deletions src/gen_context.c
View file
Expand Up @@ -4,8 +4,8 @@
* file COPYING or https://www.opensource.org/licenses/mit-license.php.*
***********************************************************************/

// Autotools creates libsecp256k1-config.h, of which ECMULT_GEN_PREC_BITS is needed.
// ifndef guard so downstream users can define their own if they do not use autotools.
/* Autotools creates libsecp256k1-config.h, of which ECMULT_GEN_PREC_BITS is needed.
ifndef guard so downstream users can define their own if they do not use autotools. */
#if !defined(ECMULT_GEN_PREC_BITS)
#include "libsecp256k1-config.h"
#endif
Expand Down

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