Merge bitcoin#925: changed include statements without prefix 'include/'

3c90bdd change local lib headers to be relative for those pointing at "include/" dir (William Bright)

Pull request description:

  Referencing bitcoin#924 , this PR splits the two issues brought on to a smaller to digest change. What this does is removes the prefix "include/" when referencing the local library header files.

  e.g:
  from:
  ```cpp
  #include "include/secp256k1.h"
  ```
  to:
  ```cpp
  #include "secp256k1.h"
  ```

  Rationale besides styling and consistency across other files in the repo, it makes it easier for outside builds to properly locate the headers.

  A live example seen here when attempting to build this library within bitcoin repo:
  ```sh
  [ 14%] Building CXX object leveldb/CMakeFiles/leveldb.dir/util/bloom.cc.o
  /tmp/bitcoin/src/secp256k1/src/secp256k1.c:7:10: fatal error: include/secp256k1.h: No such file or directory
      7 | #include "include/secp256k1.h"
        |          ^~~~~~~~~~~~~~~~~~~~~
  compilation terminated.
  make[2]: *** [secp256k1/CMakeFiles/Secp256k1.dir/build.make:76: secp256k1/CMakeFiles/Secp256k1.dir/src/secp256k1.c.o] Error 1
  make[1]: *** [CMakeFiles/Makefile2:537: secp256k1/CMakeFiles/Secp256k1.dir/all] Error 2
  make[1]: *** Waiting for unfinished jobs....

  ```

ACKs for top commit:
  gmaxwell:
    ACK 3c90bdd
  real-or-random:
    ACK 3c90bdd code looks good and even the tests compile fine now without `-I` args

Tree-SHA512: 94d212718c6f4901f1c310aff504b7afedda91268143ffe1b45e9883cd517c0599e40ac798a51b54d66cd31646fe8cb1a489f1776612cfb5963654f4a1cee757

Author: real-or-random

contrib/lax_der_parsing.c

@@ -5,7 +5,6 @@
  ***********************************************************************/
 
 #include <string.h>
-#include <secp256k1.h>
 
 #include "lax_der_parsing.h"
 

contrib/lax_der_parsing.h

@@ -51,7 +51,9 @@
 #ifndef SECP256K1_CONTRIB_LAX_DER_PARSING_H
 #define SECP256K1_CONTRIB_LAX_DER_PARSING_H
 
+#ifndef SECP256K1_H
 #include <secp256k1.h>
+#endif
 
 #ifdef __cplusplus
 extern "C" {

contrib/lax_der_privatekey_parsing.c

@@ -5,7 +5,6 @@
  ***********************************************************************/
 
 #include <string.h>
-#include <secp256k1.h>
 
 #include "lax_der_privatekey_parsing.h"
 

contrib/lax_der_privatekey_parsing.h

@@ -28,7 +28,9 @@
 #ifndef SECP256K1_CONTRIB_BER_PRIVATEKEY_H
 #define SECP256K1_CONTRIB_BER_PRIVATEKEY_H
 
+#ifndef SECP256K1_H
 #include <secp256k1.h>
+#endif
 
 #ifdef __cplusplus
 extern "C" {

src/bench_ecdh.c

@@ -6,8 +6,8 @@
 
 #include <string.h>
 
-#include "include/secp256k1.h"
-#include "include/secp256k1_ecdh.h"
+#include "../include/secp256k1.h"
+#include "../include/secp256k1_ecdh.h"
 #include "util.h"
 #include "bench.h"
 

src/bench_ecmult.c

@@ -6,8 +6,8 @@
 #include <stdio.h>
 
 #include "secp256k1.c"
+#include "../include/secp256k1.h"
 
-#include "include/secp256k1.h"
 #include "util.h"
 #include "hash_impl.h"
 #include "field_impl.h"

src/bench_internal.c

@@ -6,8 +6,8 @@
 #include <stdio.h>
 
 #include "secp256k1.c"
+#include "../include/secp256k1.h"
 
-#include "include/secp256k1.h"
 #include "assumptions.h"
 #include "util.h"
 #include "hash_impl.h"

src/bench_recover.c

@@ -4,8 +4,8 @@
  * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
  ***********************************************************************/
 
-#include "include/secp256k1.h"
-#include "include/secp256k1_recovery.h"
+#include "../include/secp256k1.h"
+#include "../include/secp256k1_recovery.h"
 #include "util.h"
 #include "bench.h"
 

src/bench_schnorrsig.c

@@ -8,8 +8,8 @@
 #include <stdlib.h>
 
 
-#include "include/secp256k1.h"
-#include "include/secp256k1_schnorrsig.h"
+#include "../include/secp256k1.h"
+#include "../include/secp256k1_schnorrsig.h"
 #include "util.h"
 #include "bench.h"
 

src/bench_sign.c

@@ -4,7 +4,7 @@
  * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
  ***********************************************************************/
 
-#include "include/secp256k1.h"
+#include "../include/secp256k1.h"
 #include "util.h"
 #include "bench.h"
 

src/bench_verify.c

@@ -7,7 +7,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#include "include/secp256k1.h"
+#include "../include/secp256k1.h"
 #include "util.h"
 #include "bench.h"
 

src/gen_context.c

@@ -18,7 +18,7 @@
    need to build the external ASM for the build and the host machine. */
 #undef USE_EXTERNAL_ASM
 
-#include "include/secp256k1.h"
+#include "../include/secp256k1.h"
 #include "assumptions.h"
 #include "util.h"
 #include "field_impl.h"

src/modules/ecdh/main_impl.h

@@ -7,8 +7,8 @@
 #ifndef SECP256K1_MODULE_ECDH_MAIN_H
 #define SECP256K1_MODULE_ECDH_MAIN_H
 
-#include "include/secp256k1_ecdh.h"
-#include "ecmult_const_impl.h"
+#include "../../../include/secp256k1_ecdh.h"
+#include "../../ecmult_const_impl.h"
 
 static int ecdh_hash_function_sha256(unsigned char *output, const unsigned char *x32, const unsigned char *y32, void *data) {
     unsigned char version = (y32[31] & 0x01) | 0x02;

src/modules/extrakeys/main_impl.h

@@ -7,8 +7,8 @@
 #ifndef SECP256K1_MODULE_EXTRAKEYS_MAIN_H
 #define SECP256K1_MODULE_EXTRAKEYS_MAIN_H
 
-#include "include/secp256k1.h"
-#include "include/secp256k1_extrakeys.h"
+#include "../../../include/secp256k1.h"
+#include "../../../include/secp256k1_extrakeys.h"
 
 static SECP256K1_INLINE int secp256k1_xonly_pubkey_load(const secp256k1_context* ctx, secp256k1_ge *ge, const secp256k1_xonly_pubkey *pubkey) {
     return secp256k1_pubkey_load(ctx, ge, (const secp256k1_pubkey *) pubkey);

src/modules/extrakeys/tests_exhaustive_impl.h

@@ -8,7 +8,7 @@
 #define SECP256K1_MODULE_EXTRAKEYS_TESTS_EXHAUSTIVE_H
 
 #include "src/modules/extrakeys/main_impl.h"
-#include "include/secp256k1_extrakeys.h"
+#include "../../../include/secp256k1_extrakeys.h"
 
 static void test_exhaustive_extrakeys(const secp256k1_context *ctx, const secp256k1_ge* group) {
     secp256k1_keypair keypair[EXHAUSTIVE_TEST_ORDER - 1];

src/modules/extrakeys/tests_impl.h

@@ -7,7 +7,7 @@
 #ifndef SECP256K1_MODULE_EXTRAKEYS_TESTS_H
 #define SECP256K1_MODULE_EXTRAKEYS_TESTS_H
 
-#include "secp256k1_extrakeys.h"
+#include "../../../include/secp256k1_extrakeys.h"
 
 static secp256k1_context* api_test_context(int flags, int *ecount) {
     secp256k1_context *ctx0 = secp256k1_context_create(flags);

src/modules/recovery/main_impl.h

@@ -7,7 +7,7 @@
 #ifndef SECP256K1_MODULE_RECOVERY_MAIN_H
 #define SECP256K1_MODULE_RECOVERY_MAIN_H
 
-#include "include/secp256k1_recovery.h"
+#include "../../../include/secp256k1_recovery.h"
 
 static void secp256k1_ecdsa_recoverable_signature_load(const secp256k1_context* ctx, secp256k1_scalar* r, secp256k1_scalar* s, int* recid, const secp256k1_ecdsa_recoverable_signature* sig) {
     (void)ctx;

src/modules/recovery/tests_exhaustive_impl.h

@@ -8,7 +8,7 @@
 #define SECP256K1_MODULE_RECOVERY_EXHAUSTIVE_TESTS_H
 
 #include "src/modules/recovery/main_impl.h"
-#include "include/secp256k1_recovery.h"
+#include "../../../include/secp256k1_recovery.h"
 
 void test_exhaustive_recovery_sign(const secp256k1_context *ctx, const secp256k1_ge *group) {
     int i, j, k;

src/modules/schnorrsig/main_impl.h

@@ -7,9 +7,9 @@
 #ifndef SECP256K1_MODULE_SCHNORRSIG_MAIN_H
 #define SECP256K1_MODULE_SCHNORRSIG_MAIN_H
 
-#include "include/secp256k1.h"
-#include "include/secp256k1_schnorrsig.h"
-#include "hash.h"
+#include "../../../include/secp256k1.h"
+#include "../../../include/secp256k1_schnorrsig.h"
+#include "../../hash.h"
 
 /* Initializes SHA256 with fixed midstate. This midstate was computed by applying
  * SHA256 to SHA256("BIP0340/nonce")||SHA256("BIP0340/nonce"). */

src/modules/schnorrsig/tests_exhaustive_impl.h

@@ -7,7 +7,7 @@
 #ifndef SECP256K1_MODULE_SCHNORRSIG_TESTS_EXHAUSTIVE_H
 #define SECP256K1_MODULE_SCHNORRSIG_TESTS_EXHAUSTIVE_H
 
-#include "include/secp256k1_schnorrsig.h"
+#include "../../../include/secp256k1_schnorrsig.h"
 #include "src/modules/schnorrsig/main_impl.h"
 
 static const unsigned char invalid_pubkey_bytes[][32] = {

src/modules/schnorrsig/tests_impl.h

@@ -7,7 +7,7 @@
 #ifndef SECP256K1_MODULE_SCHNORRSIG_TESTS_H
 #define SECP256K1_MODULE_SCHNORRSIG_TESTS_H
 
-#include "secp256k1_schnorrsig.h"
+#include "../../../include/secp256k1_schnorrsig.h"
 
 /* Checks that a bit flip in the n_flip-th argument (that has n_bytes many
  * bytes) changes the hash function

src/secp256k1.c

@@ -6,8 +6,8 @@
 
 #define SECP256K1_BUILD
 
-#include "include/secp256k1.h"
-#include "include/secp256k1_preallocated.h"
+#include "../include/secp256k1.h"
+#include "../include/secp256k1_preallocated.h"
 
 #include "assumptions.h"
 #include "util.h"

src/tests.c

@@ -15,8 +15,8 @@
 #include <time.h>
 
 #include "secp256k1.c"
-#include "include/secp256k1.h"
-#include "include/secp256k1_preallocated.h"
+#include "../include/secp256k1.h"
+#include "../include/secp256k1_preallocated.h"
 #include "testrand_impl.h"
 #include "util.h"
 
@@ -30,8 +30,8 @@ void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
 # endif
 #endif
 
-#include "contrib/lax_der_parsing.c"
-#include "contrib/lax_der_privatekey_parsing.c"
+#include "../contrib/lax_der_parsing.c"
+#include "../contrib/lax_der_privatekey_parsing.c"
 
 #include "modinv32_impl.h"
 #ifdef SECP256K1_WIDEMUL_INT128

src/tests_exhaustive.c

@@ -10,7 +10,6 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-
 #include <time.h>
 
 #undef USE_ECMULT_STATIC_PRECOMPUTATION
@@ -21,7 +20,7 @@
 #endif
 
 #include "secp256k1.c"
-#include "include/secp256k1.h"
+#include "../include/secp256k1.h"
 #include "assumptions.h"
 #include "group.h"
 #include "testrand_impl.h"

src/valgrind_ctime_test.c

@@ -7,24 +7,24 @@
 #include <valgrind/memcheck.h>
 #include <stdio.h>
 
-#include "include/secp256k1.h"
+#include "../include/secp256k1.h"
 #include "assumptions.h"
 #include "util.h"
 
 #ifdef ENABLE_MODULE_ECDH
-# include "include/secp256k1_ecdh.h"
+# include "../include/secp256k1_ecdh.h"
 #endif
 
 #ifdef ENABLE_MODULE_RECOVERY
-# include "include/secp256k1_recovery.h"
+# include "../include/secp256k1_recovery.h"
 #endif
 
 #ifdef ENABLE_MODULE_EXTRAKEYS
-# include "include/secp256k1_extrakeys.h"
+# include "../include/secp256k1_extrakeys.h"
 #endif
 
 #ifdef ENABLE_MODULE_SCHNORRSIG
-#include "include/secp256k1_schnorrsig.h"
+#include "../include/secp256k1_schnorrsig.h"
 #endif
 
 void run_tests(secp256k1_context *ctx, unsigned char *key);