From 1f7e8e937d0e71e7eb3b5deab38b34d0a0159d88 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Thu, 17 Sep 2026 21:50:34 +0200
Subject: Added include guards

---
 src/solvers/coord/checkdata.h             | 5 +++++
 src/solvers/coord/common.h                | 5 +++++
 src/solvers/coord/coord.h                 | 5 +++++
 src/solvers/coord/corners.h               | 5 +++++
 src/solvers/coord/cornersx.h              | 5 +++++
 src/solvers/coord/cpepe.h                 | 5 +++++
 src/solvers/coord/dr.h                    | 5 +++++
 src/solvers/coord/dreo.h                  | 5 +++++
 src/solvers/coord/drfin.h                 | 5 +++++
 src/solvers/coord/drfinnoe.h              | 5 +++++
 src/solvers/coord/drslice.h               | 5 +++++
 src/solvers/coord/eo.h                    | 5 +++++
 src/solvers/coord/gendata.h               | 5 +++++
 src/solvers/coord/htr.h                   | 5 +++++
 src/solvers/coord/list.h                  | 5 +++++
 src/solvers/coord/multisolve.h            | 5 +++++
 src/solvers/coord/solve.h                 | 5 +++++
 src/solvers/coord/types_macros.h          | 5 +++++
 src/solvers/coord/utils.h                 | 5 +++++
 src/solvers/dispatch.h                    | 5 +++++
 src/solvers/distribution.h                | 5 +++++
 src/solvers/h48/checkdata.h               | 5 +++++
 src/solvers/h48/coordinate.h              | 5 +++++
 src/solvers/h48/coordinate_types_macros.h | 5 +++++
 src/solvers/h48/distribution_h48.h        | 5 +++++
 src/solvers/h48/gendata_cocsep.h          | 5 +++++
 src/solvers/h48/gendata_eoesep.h          | 5 +++++
 src/solvers/h48/gendata_h48.h             | 5 +++++
 src/solvers/h48/gendata_types_macros.h    | 5 +++++
 src/solvers/h48/h48.h                     | 5 +++++
 src/solvers/h48/map.h                     | 5 +++++
 src/solvers/h48/map_types_macros.h        | 5 +++++
 src/solvers/h48/solve.h                   | 5 +++++
 src/solvers/h48/utils.h                   | 5 +++++
 src/solvers/solutions.h                   | 5 +++++
 src/solvers/solutions_types_macros.h      | 5 +++++
 src/solvers/solvers.h                     | 5 +++++
 src/solvers/tables.h                      | 5 +++++
 src/solvers/tables_types_macros.h         | 5 +++++
 39 files changed, 195 insertions(+)

(limited to 'src/solvers')

diff --git a/src/solvers/coord/checkdata.h b/src/solvers/coord/checkdata.h
index 51265a8..a5d5316 100644
--- a/src/solvers/coord/checkdata.h
+++ b/src/solvers/coord/checkdata.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_CHECKDATA_H
+#define SOLVERS_COORD_CHECKDATA_H
+
 STATIC long long checkdata_coord_dispatch(
     const char *, unsigned long long, const unsigned char *);
 STATIC long long checkdata_coord(
@@ -120,3 +123,5 @@ checkdata_multicoord(
 
 	return NISSY_OK;
 }
+
+#endif /* SOLVERS_COORD_CHECKDATA_H */
diff --git a/src/solvers/coord/common.h b/src/solvers/coord/common.h
index 3a62e85..8e6db20 100644
--- a/src/solvers/coord/common.h
+++ b/src/solvers/coord/common.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_COMMON_H
+#define SOLVERS_COORD_COMMON_H
+
 STATIC uint64_t coord_coord_generic(
     const coord_t [NON_NULL], cube_t, const unsigned char *);
 STATIC cube_t coord_cube_generic(
@@ -229,3 +232,5 @@ coordinate_merge_cpco(cube_t cp, cube_t co)
 
 	return merged;
 }
+
+#endif /* SOLVERS_COORD_COMMON_H */
diff --git a/src/solvers/coord/coord.h b/src/solvers/coord/coord.h
index 98f4d05..6c4cc1b 100644
--- a/src/solvers/coord/coord.h
+++ b/src/solvers/coord/coord.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_COORD_H
+#define SOLVERS_COORD_COORD_H
+
 #include "types_macros.h"
 #include "common.h"
 #include "eo.h"
@@ -16,3 +19,5 @@
 #include "checkdata.h"
 #include "solve.h"
 #include "multisolve.h"
+
+#endif /* SOLVERS_COORD_COORD_H */
diff --git a/src/solvers/coord/corners.h b/src/solvers/coord/corners.h
index cc0d9a5..6dd60b5 100644
--- a/src/solvers/coord/corners.h
+++ b/src/solvers/coord/corners.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_CORNERS_H
+#define SOLVERS_COORD_CORNERS_H
+
 #define CLASSES_CP_48 984
 
 STATIC uint64_t coordinate_corners_coord(const cube_t, const unsigned char *);
@@ -70,3 +73,5 @@ coordinate_corners_gendata(unsigned char *data)
 {
 	return coord_gendata_generic(&coordinate_corners, data);
 }
+
+#endif /* SOLVERS_COORD_CORNERS_H */
diff --git a/src/solvers/coord/cornersx.h b/src/solvers/coord/cornersx.h
index 788db8d..f4b564f 100644
--- a/src/solvers/coord/cornersx.h
+++ b/src/solvers/coord/cornersx.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_CORNERSX_H
+#define SOLVERS_COORD_CORNERSX_H
+
 STATIC bool is_cornersx_solved(uint64_t, const unsigned char *);
 
 STATIC coord_t coordinate_cornersx = {
@@ -74,3 +77,5 @@ is_cornersx_solved(uint64_t coord, const unsigned char *data)
 
 	return false;
 }
+
+#endif /* SOLVERS_COORD_CORNERSX_H */
diff --git a/src/solvers/coord/cpepe.h b/src/solvers/coord/cpepe.h
index 7035400..1ad80dd 100644
--- a/src/solvers/coord/cpepe.h
+++ b/src/solvers/coord/cpepe.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_CPEPE_H
+#define SOLVERS_COORD_CPEPE_H
+
 STATIC uint64_t coordinate_cpepe_coord(const cube_t, const unsigned char *);
 STATIC cube_t coordinate_cpepe_cube(uint64_t, const unsigned char *);
 STATIC bool coordinate_cpepe_isnasty(uint64_t, const unsigned char *);
@@ -71,3 +74,5 @@ coordinate_cpepe_gendata(unsigned char *data)
 {
 	return coord_gendata_generic(&coordinate_cpepe, data);
 }
+
+#endif /* SOLVERS_COORD_CPEPE_H */
diff --git a/src/solvers/coord/dr.h b/src/solvers/coord/dr.h
index 8100910..c5c73c2 100644
--- a/src/solvers/coord/dr.h
+++ b/src/solvers/coord/dr.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_DR_H
+#define SOLVERS_COORD_DR_H
+
 #define DREOESEP_CLASSES UINT64_C(64430)
 #define DREOESEP_MAX     (POW_2_11 * COMB_12_4)
 
@@ -117,3 +120,5 @@ is_eoco_solvable(cube_t cube) {
 
 	return cocount % 3 == 0 && eocount % 2 == 0;
 }
+
+#endif /* SOLVERS_COORD_DR_H */
diff --git a/src/solvers/coord/dreo.h b/src/solvers/coord/dreo.h
index c5cacac..a201ae6 100644
--- a/src/solvers/coord/dreo.h
+++ b/src/solvers/coord/dreo.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_DREO_H
+#define SOLVERS_COORD_DREO_H
+
 #define DRESEP_CLASSES 81
 
 STATIC uint64_t coord_dresep_nosym(cube_t);
@@ -101,3 +104,5 @@ is_dreo_solvable(cube_t cube) {
 
 	return cocount % 3 == 0;
 }
+
+#endif /* SOLVERS_COORD_DREO_H */
diff --git a/src/solvers/coord/drfin.h b/src/solvers/coord/drfin.h
index 569419b..ec645a2 100644
--- a/src/solvers/coord/drfin.h
+++ b/src/solvers/coord/drfin.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_DRFIN_H
+#define SOLVERS_COORD_DRFIN_H
+
 STATIC bool is_drfin_solvable(cube_t);
 
 STATIC multicoord_t multicoordinate_drfin = {
@@ -15,3 +18,5 @@ is_drfin_solvable(cube_t cube)
 	       coord_co(cube) == 0 &&
 	       issolvable((oriented_cube_t){.cube = cube, .orientation = 0});
 }
+
+#endif /* SOLVERS_COORD_DRFIN_H */
diff --git a/src/solvers/coord/drfinnoe.h b/src/solvers/coord/drfinnoe.h
index 63f4edf..5ffffc3 100644
--- a/src/solvers/coord/drfinnoe.h
+++ b/src/solvers/coord/drfinnoe.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_DRFINNOE_H
+#define SOLVERS_COORD_DRFINNOE_H
+
 /*
 TODO
 
@@ -96,3 +99,5 @@ is_drfinnoe_solvable(cube_t cube) {
 	       coord_eo(transform_edges(cube, TRANS_URr)) == 0 &&
 	       coord_co(cube) == 0;
 }
+
+#endif /* SOLVERS_COORD_DRFINNOE_H */
diff --git a/src/solvers/coord/drslice.h b/src/solvers/coord/drslice.h
index 42699f8..87bf87e 100644
--- a/src/solvers/coord/drslice.h
+++ b/src/solvers/coord/drslice.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_DRSLICE_H
+#define SOLVERS_COORD_DRSLICE_H
+
 /*
 The DRSLICE coordinate is almost identical to DRFINNOE, but it allows for
 the centers of the E layer to be off by a rotation. For this reason we reuse
@@ -95,3 +98,5 @@ is_drslice_solved(uint64_t i, const unsigned char *data)
 	/* Pre-computed coordinates of U D' (= U' D up to trans) and U2 D2 */
 	return i == 0 || i == 109779816 || i == 68468527;
 }
+
+#endif /* SOLVERS_COORD_DRSLICE_H */
diff --git a/src/solvers/coord/eo.h b/src/solvers/coord/eo.h
index 42196af..a5a0e85 100644
--- a/src/solvers/coord/eo.h
+++ b/src/solvers/coord/eo.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_EO_H
+#define SOLVERS_COORD_EO_H
+
 STATIC uint64_t coordinate_eo_coord(cube_t, const unsigned char *);
 STATIC cube_t coordinate_eo_cube(uint64_t, const unsigned char *);
 STATIC bool coordinate_eo_isnasty(uint64_t, const unsigned char *);
@@ -57,3 +60,5 @@ coordinate_eo_gendata(unsigned char *data)
 {
 	return 0;
 }
+
+#endif /* SOLVERS_COORD_EO_H */
diff --git a/src/solvers/coord/gendata.h b/src/solvers/coord/gendata.h
index edf6ce6..0acf9c0 100644
--- a/src/solvers/coord/gendata.h
+++ b/src/solvers/coord/gendata.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_GENDATA_H
+#define SOLVERS_COORD_GENDATA_H
+
 STATIC size_t gendata_coord(const coord_t [NON_NULL], unsigned char *);
 STATIC size_t gendata_multicoord(
     const multicoord_t [NON_NULL], unsigned char *);
@@ -353,3 +356,5 @@ set_coord_pval(
 	table[COORD_INDEX(i)] = (table[COORD_INDEX(i)] & (~COORD_MASK(i)))
 	    | (val << COORD_SHIFT(i));
 }
+
+#endif /* SOLVERS_COORD_GENDATA_H */
diff --git a/src/solvers/coord/htr.h b/src/solvers/coord/htr.h
index 602625b..d6fc311 100644
--- a/src/solvers/coord/htr.h
+++ b/src/solvers/coord/htr.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_HTR_H
+#define SOLVERS_COORD_HTR_H
+
 STATIC uint64_t coordinate_htr_coord(cube_t, const unsigned char *);
 STATIC cube_t coordinate_htr_cube(uint64_t, const unsigned char *);
 STATIC bool coordinate_htr_isnasty(uint64_t, const unsigned char *);
@@ -123,3 +126,5 @@ is_cp_htr(uint64_t i, const unsigned char *data)
 
 	return e == 0 && is_cp16_htr_table[c / 8] & (UINT8_C(1) << (c % 8));
 }
+
+#endif /* SOLVERS_COORD_HTR_H */
diff --git a/src/solvers/coord/list.h b/src/solvers/coord/list.h
index 6856c13..71f7920 100644
--- a/src/solvers/coord/list.h
+++ b/src/solvers/coord/list.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_LIST_H
+#define SOLVERS_COORD_LIST_H
+
 coord_t *all_coordinates[] = {
 	&coordinate_eo,
 	&coordinate_dr,
@@ -15,3 +18,5 @@ multicoord_t *all_multicoordinates[] = {
 	&multicoordinate_drfin,
 	NULL
 };
+
+#endif /* SOLVERS_COORD_LIST_H */
diff --git a/src/solvers/coord/multisolve.h b/src/solvers/coord/multisolve.h
index efd287d..4990a39 100644
--- a/src/solvers/coord/multisolve.h
+++ b/src/solvers/coord/multisolve.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_MULTISOLVE_H
+#define SOLVERS_COORD_MULTISOLVE_H
+
 /*
 For now the only multicoordinate is DRFIN, and this solver reflects this.
 For example, NISS is not available.
@@ -297,3 +300,5 @@ solve_multicoord_error_unsolvable:
 	LOG("[%s solve] Error: cube not ready\n", mcoord->name);
 	return NISSY_ERROR_UNSOLVABLE_CUBE;
 }
+
+#endif /* SOLVERS_COORD_MULTISOLVE_H */
diff --git a/src/solvers/coord/solve.h b/src/solvers/coord/solve.h
index 6bb9af2..9a0c63c 100644
--- a/src/solvers/coord/solve.h
+++ b/src/solvers/coord/solve.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_SOLVE_H
+#define SOLVERS_COORD_SOLVE_H
+
 typedef struct {
 	cube_t cube;
 	cube_t inverse;
@@ -400,3 +403,5 @@ solve_coord_error_unsolvable:
 	LOG("[%s solve] Error: cube not ready\n", coord->name);
 	return NISSY_ERROR_UNSOLVABLE_CUBE;
 }
+
+#endif /* SOLVERS_COORD_SOLVE_H */
diff --git a/src/solvers/coord/types_macros.h b/src/solvers/coord/types_macros.h
index 81db9d4..b042788 100644
--- a/src/solvers/coord/types_macros.h
+++ b/src/solvers/coord/types_macros.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_TYPES_MACROS_H
+#define SOLVERS_COORD_TYPES_MACROS_H
+
 #define COORD_INDEX(i)      ((i)/2)
 #define COORD_SHIFT(i)      (UINT8_C(4) * (uint8_t)((i) % 2))
 #define COORD_MASK(i)       (UINT8_C(0xF) << COORD_SHIFT(i))
@@ -53,3 +56,5 @@ typedef struct {
 	uint64_t moves_mask;
 	bool (*is_solvable)(cube_t);
 } multicoord_t;
+
+#endif /* SOLVERS_COORD_TYPES_MACROS_H */
diff --git a/src/solvers/coord/utils.h b/src/solvers/coord/utils.h
index 0062587..232d6f8 100644
--- a/src/solvers/coord/utils.h
+++ b/src/solvers/coord/utils.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_UTILS_H
+#define SOLVERS_COORD_UTILS_H
+
 STATIC coord_t *parse_coord(size_t, const char *);
 STATIC multicoord_t *parse_multicoord(size_t, const char *);
 STATIC void parse_coord_and_trans(
@@ -80,3 +83,5 @@ dataid_coord(const char *ca, char dataid[SIZE(NISSY_SIZE_DATAID)])
 	LOG("Error: cannot parse coordinate from '%s'\n", ca);
 	return NISSY_ERROR_INVALID_SOLVER;
 }
+
+#endif /* SOLVERS_COORD_UTILS_H */
diff --git a/src/solvers/dispatch.h b/src/solvers/dispatch.h
index 810247f..d484736 100644
--- a/src/solvers/dispatch.h
+++ b/src/solvers/dispatch.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_DISPATCH_H
+#define SOLVERS_DISPATCH_H
+
 typedef struct {
 	const char *solvername;
 	const char *prefix;
@@ -92,3 +95,5 @@ match_solver(const char *name)
 
 	return solver_dispatchers[i];
 }
+
+#endif /* SOLVERS_DISPATCH_H */
diff --git a/src/solvers/distribution.h b/src/solvers/distribution.h
index a996e3db..1ed7453 100644
--- a/src/solvers/distribution.h
+++ b/src/solvers/distribution.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_DISTRIBUTION_H
+#define SOLVERS_DISTRIBUTION_H
+
 #define ENTRIES_PER_BYTE(k) (UINT64_C(8) / (uint64_t)(k))
 #define TABLE_SHIFT(i, k)   ((uint8_t)(k) * (uint8_t)((i) % ENTRIES_PER_BYTE(k)))
 #define TABLE_MASK(i, k)    ((UINT8_BIT(k) - UINT8_C(1)) << TABLE_SHIFT(i, k))
@@ -99,3 +102,5 @@ distribution_equal(
 
 	return wrong == 0;
 }
+
+#endif /* SOLVERS_DISTRIBUTION_H */
diff --git a/src/solvers/h48/checkdata.h b/src/solvers/h48/checkdata.h
index 948ac67..e2fa38c 100644
--- a/src/solvers/h48/checkdata.h
+++ b/src/solvers/h48/checkdata.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_CHECKDATA_H
+#define SOLVERS_H48_CHECKDATA_H
+
 STATIC long long checkdata_h48(
     const char *, unsigned long long, const unsigned char *);
 
@@ -194,3 +197,5 @@ checkdata_h48(
 
 	return NISSY_OK;
 }
+
+#endif /* SOLVERS_H48_CHECKDATA_H */
diff --git a/src/solvers/h48/coordinate.h b/src/solvers/h48/coordinate.h
index 695efc3..acbb9c0 100644
--- a/src/solvers/h48/coordinate.h
+++ b/src/solvers/h48/coordinate.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_COORDINATE_H
+#define SOLVERS_H48_COORDINATE_H
+
 STATIC_INLINE uint64_t coord_h48(
     cube_t, const uint32_t [SIZE(COCSEP_TABLESIZE)], uint8_t);
 STATIC_INLINE uint64_t coord_h48_edges(cube_t, uint64_t, uint8_t, uint8_t);
@@ -68,3 +71,5 @@ invcoord_h48(
 
 	return ret;
 }
+
+#endif /* SOLVERS_H48_COORDINATE_H */
diff --git a/src/solvers/h48/coordinate_types_macros.h b/src/solvers/h48/coordinate_types_macros.h
index cf24e47..6ddd3e8 100644
--- a/src/solvers/h48/coordinate_types_macros.h
+++ b/src/solvers/h48/coordinate_types_macros.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_COORDINATE_TYPES_MACROS_H
+#define SOLVERS_H48_COORDINATE_TYPES_MACROS_H
+
 #define H48_ESIZE(h) ((COMB_12_4 * COMB_8_4) << (uint64_t)(h))
 
 #define COCLASS_MASK (UINT32_C(0xFFFF) << UINT32_C(16))
@@ -5,3 +8,5 @@
 #define ECLASS(x)    COCLASS(x)
 #define TTREP_MASK   (UINT32_C(0xFF) << UINT32_C(8))
 #define TTREP(x)     (((x) & TTREP_MASK) >> UINT32_C(8))
+
+#endif /* SOLVERS_H48_COORDINATE_TYPES_MACROS_H */
diff --git a/src/solvers/h48/distribution_h48.h b/src/solvers/h48/distribution_h48.h
index 2cb50aa..b7f3811 100644
--- a/src/solvers/h48/distribution_h48.h
+++ b/src/solvers/h48/distribution_h48.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_DISTRIBUTION_H48_H
+#define SOLVERS_H48_DISTRIBUTION_H48_H
+
 /*
 This file is very similar to ../distibution.h, but some adaptations are
 needed for H48 because of the intertwined fallback table, and it is easier
@@ -74,3 +77,5 @@ getdistribution_h48(
 	c = H48_LINE_EXT(H48_COORDMAX(info->h48h)) % H48_LINE_ALLCOORDS;
 	distr[3] -= H48_LINE_COORDS - c;
 }
+
+#endif /* SOLVERS_H48_DISTRIBUTION_H48_H */
diff --git a/src/solvers/h48/gendata_cocsep.h b/src/solvers/h48/gendata_cocsep.h
index f83207b..1cea52e 100644
--- a/src/solvers/h48/gendata_cocsep.h
+++ b/src/solvers/h48/gendata_cocsep.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_GENDATA_COCSEP_H
+#define SOLVERS_H48_GENDATA_COCSEP_H
+
 STATIC size_t gendata_cocsep(unsigned char *, uint64_t *, cube_t *);
 STATIC uint32_t gendata_cocsep_dfs(cocsep_dfs_arg_t [NON_NULL]);
 
@@ -164,3 +167,5 @@ get_h48_cdata(
 
 	return CBOUND(*cdata);
 }
+
+#endif /* SOLVERS_H48_GENDATA_COCSEP_H */
diff --git a/src/solvers/h48/gendata_eoesep.h b/src/solvers/h48/gendata_eoesep.h
index 81bbd43..55097c9 100644
--- a/src/solvers/h48/gendata_eoesep.h
+++ b/src/solvers/h48/gendata_eoesep.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_GENDATA_EOESEP_H
+#define SOLVERS_H48_GENDATA_EOESEP_H
+
 STATIC uint64_t coord_eoesep_sym(cube_t, const uint32_t [SIZE(ESEP_MAX)]);
 STATIC size_t gendata_esep_classes(
     uint32_t [SIZE(ESEP_MAX)], uint16_t [SIZE(ESEP_CLASSES)]);
@@ -280,3 +283,5 @@ set_eoesep_pval(
 	table[EOESEP_INDEX(i)] = (table[EOESEP_INDEX(i)] & (~EOESEP_MASK(i)))
 	    | (val << EOESEP_SHIFT(i));
 }
+
+#endif /* SOLVERS_H48_GENDATA_EOESEP_H */
diff --git a/src/solvers/h48/gendata_h48.h b/src/solvers/h48/gendata_h48.h
index 53b1fad..0b85e49 100644
--- a/src/solvers/h48/gendata_h48.h
+++ b/src/solvers/h48/gendata_h48.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_GENDATA_H48_H
+#define SOLVERS_H48_GENDATA_H48_H
+
 STATIC long long gendata_h48_dispatch(
     const char *, unsigned long long, unsigned char *);
 STATIC uint64_t gendata_h48short(gendata_h48short_arg_t [NON_NULL]);
@@ -547,3 +550,5 @@ get_h48_pval_and_min(
 	*pval_min = tmin >> UINT8_C(4);
 	return (t & H48_MASK(iext)) >> H48_SHIFT(iext);
 }
+
+#endif /* SOLVERS_H48_GENDATA_H48_H */
diff --git a/src/solvers/h48/gendata_types_macros.h b/src/solvers/h48/gendata_types_macros.h
index 9bce2c9..e81acc5 100644
--- a/src/solvers/h48/gendata_types_macros.h
+++ b/src/solvers/h48/gendata_types_macros.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_GENDATA_TYPES_MACROS_H
+#define SOLVERS_H48_GENDATA_TYPES_MACROS_H
+
 #define COCSEP_CLASSES      ((size_t)3393)
 #define COCSEP_TABLESIZE    ((size_t)POW_3_7 << (size_t)7)
 #define COCSEP_VISITEDSIZE  DIV_ROUND_UP(COCSEP_TABLESIZE, (size_t)8)
@@ -116,3 +119,5 @@ typedef struct {
 	wrapthread_atomic unsigned char *table_atomic;
 	wrapthread_define_struct_mutex_t(**table_mutex);
 } gendata_h48_mark_t;
+
+#endif /* SOLVERS_H48_GENDATA_TYPES_MACROS_H */
diff --git a/src/solvers/h48/h48.h b/src/solvers/h48/h48.h
index f7ba8b7..e05fc2b 100644
--- a/src/solvers/h48/h48.h
+++ b/src/solvers/h48/h48.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_H48_H
+#define SOLVERS_H48_H48_H
+
 #include "utils.h"
 #include "coordinate_types_macros.h"
 #include "map_types_macros.h"
@@ -10,3 +13,5 @@
 #include "gendata_h48.h"
 #include "checkdata.h"
 #include "solve.h"
+
+#endif /* SOLVERS_H48_H48_H */
diff --git a/src/solvers/h48/map.h b/src/solvers/h48/map.h
index c9cfb06..75b5236 100644
--- a/src/solvers/h48/map.h
+++ b/src/solvers/h48/map.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_MAP_H
+#define SOLVERS_H48_MAP_H
+
 STATIC void h48map_create(h48map_t [NON_NULL], uint64_t, uint64_t);
 STATIC void h48map_clear(h48map_t [NON_NULL]);
 STATIC void h48map_destroy(h48map_t [NON_NULL]);
@@ -82,3 +85,5 @@ h48map_nextkvpair(h48map_t map[NON_NULL], uint64_t p[NON_NULL])
 
 	return kv;
 }
+
+#endif /* SOLVERS_H48_MAP_H */
diff --git a/src/solvers/h48/map_types_macros.h b/src/solvers/h48/map_types_macros.h
index b77c68a..a4e3c75 100644
--- a/src/solvers/h48/map_types_macros.h
+++ b/src/solvers/h48/map_types_macros.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_MAP_TYPES_MACROS_H
+#define SOLVERS_H48_MAP_TYPES_MACROS_H
+
 #define MAP_UNSET             UINT64_C(0xFFFFFFFFFFFFFFFF)
 #define MAP_KEYMASK           UINT64_C(0xFFFFFFFFFF)
 #define MAP_KEYSHIFT          UINT64_C(40)
@@ -14,3 +17,5 @@ typedef struct {
 	uint64_t key;
 	uint64_t val;
 } kvpair_t;
+
+#endif /* SOLVERS_H48_MAP_TYPES_MACROS_H */
diff --git a/src/solvers/h48/solve.h b/src/solvers/h48/solve.h
index ebc5208..36fefa1 100644
--- a/src/solvers/h48/solve.h
+++ b/src/solvers/h48/solve.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_SOLVE_H
+#define SOLVERS_H48_SOLVE_H
+
 #define H48_STARTING_MOVES 4
 #define H48_STARTING_CUBES 43254
 #define H48_SORT_TASKS_MIN_DEPTH 16
@@ -758,3 +761,5 @@ solve_h48_error_data:
 solve_h48_error_solutions_buffer:
 	return NISSY_ERROR_BUFFER_SIZE;
 }
+
+#endif /* SOLVERS_H48_SOLVE_H */
diff --git a/src/solvers/h48/utils.h b/src/solvers/h48/utils.h
index 6d91108..81c6451 100644
--- a/src/solvers/h48/utils.h
+++ b/src/solvers/h48/utils.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_H48_UTILS_H
+#define SOLVERS_H48_UTILS_H
+
 #if SIZE_MAX == UINT64_MAX
 #define H48_HMAX UINT8_C(11)
 #else
@@ -63,3 +66,5 @@ dataid_h48(const char *str, char buf[SIZE(NISSY_SIZE_DATAID)])
 	sprintf(buf, "h48h%" PRIu8, h);
 	return NISSY_OK;
 }
+
+#endif /* SOLVERS_H48_UTILS_H */
diff --git a/src/solvers/solutions.h b/src/solvers/solutions.h
index b7a848b..f9bed75 100644
--- a/src/solvers/solutions.h
+++ b/src/solvers/solutions.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_SOLUTIONS_H
+#define SOLVERS_SOLUTIONS_H
+
 STATIC void solution_moves_reset(solution_moves_t [NON_NULL]);
 STATIC void solution_moves_transform(solution_moves_t [NON_NULL], size_t,
     uint8_t);
@@ -338,3 +341,5 @@ solutions_done(
 	    depth > list->shortest_sol + settings->optimal ||
 	    list->nsols >= settings->maxsolutions;
 }
+
+#endif /* SOLVERS_SOLUTIONS_H */
diff --git a/src/solvers/solutions_types_macros.h b/src/solvers/solutions_types_macros.h
index 4727e5a..8454a21 100644
--- a/src/solvers/solutions_types_macros.h
+++ b/src/solvers/solutions_types_macros.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_SOLUTIONS_TYPES_MACROS_H
+#define SOLVERS_SOLUTIONS_TYPES_MACROS_H
+
 #define SOLUTION_MAXLEN 20
 
 typedef struct {
@@ -22,3 +25,5 @@ typedef struct {
 	size_t used;
 	char *buf;
 } solution_list_t;
+
+#endif /* SOLVERS_SOLUTIONS_TYPES_MACROS_H */
diff --git a/src/solvers/solvers.h b/src/solvers/solvers.h
index e19b08a..78180aa 100644
--- a/src/solvers/solvers.h
+++ b/src/solvers/solvers.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_SOLVERS_H
+#define SOLVERS_SOLVERS_H
+
 #include "solutions_types_macros.h"
 #include "solutions.h"
 #include "tables_types_macros.h"
@@ -6,3 +9,5 @@
 #include "coord/coord.h"
 #include "h48/h48.h"
 #include "dispatch.h"
+
+#endif /* SOLVERS_SOLVERS_H */
diff --git a/src/solvers/tables.h b/src/solvers/tables.h
index 3db1d1e..f850793 100644
--- a/src/solvers/tables.h
+++ b/src/solvers/tables.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_TABLES_H
+#define SOLVERS_TABLES_H
+
 STATIC uint64_t read_unaligned_u64(
     const unsigned char [SIZE(sizeof(uint64_t))]);
 STATIC void write_unaligned_u64(
@@ -147,3 +150,5 @@ append_name(tableinfo_t info[NON_NULL], const char *str)
 
 	info->solver[j] = '\0';
 }
+
+#endif /* SOLVERS_TABLES_H */
diff --git a/src/solvers/tables_types_macros.h b/src/solvers/tables_types_macros.h
index b2809b7..8ae18d3 100644
--- a/src/solvers/tables_types_macros.h
+++ b/src/solvers/tables_types_macros.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_TABLES_TYPES_MACROS_H
+#define SOLVERS_TABLES_TYPES_MACROS_H
+
 #define OFFSET(B, K)             (((unsigned char *)B) + K)
 
 #define INFOSIZE                 INT64_C(512)
@@ -37,3 +40,5 @@ typedef struct {
 	uint8_t base;
 	uint8_t maxvalue;
 } tableinfo_t;
+
+#endif /* SOLVERS_TABLES_TYPES_MACROS_H */
-- 
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