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Merge #862: Autoconf improvements

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3c15130709 Improve CC_FOR_BUILD detection (Tim Ruffing)
47802a4762 Restructure and tidy configure.ac (Tim Ruffing)
252c19dfc6 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 (https://github.com/bitcoin-core/secp256k1/issues/621#issuecomment-495703399)

  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 This is outdated, and [there have been a lot of fixes](https://github.com/autoconf-archive/autoconf-archive/pull/207) But the latest version is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 3c15130709
  jonasnick:
    utACK 3c15130 makes sense (with my very basic understanding of autoconf)

Tree-SHA512: 595b9de316374c2213f1340cddaa22eb3190b01fa99aa6ae26e77804df41e7ecf96a09e03c28e8f8b9fd04e211e4ee2f78f1e5a7995143c84f99d2e16d4f0260
This commit is contained in:
Tim Ruffing
2021-01-12 15:34:33 +01:00
parent 328aaef22a 3c15130709
commit f2d9aeae6d
3 changed files with 144 additions and 80 deletions
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4
src/gen_context.c
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@@ -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