Add more reminders to include <config.h>.

* lib/aligned-malloc.h: Check that config.h was already included.
* lib/careadlinkat.h: Likewise.
* lib/filemode.h: Likewise.
* lib/freadptr.h: Likewise.
* lib/fseterr.h: Likewise.
* lib/glthread/lock.h: Likewise.
* lib/glthread/tls.h: Likewise.
* lib/immutable.h: Likewise.
* lib/isapipe.h: Likewise.
* lib/isnand-nolibm.h: Likewise.
* lib/isnanf-nolibm.h: Likewise.
* lib/isnanl-nolibm.h: Likewise.
* lib/mbswidth.h: Likewise.
* lib/md5.h: Likewise.
* lib/minmax.h: Likewise.
* lib/msvc-inval.h: Likewise.
* lib/msvc-nothrow.h: Likewise.
* lib/pathmax.h: Likewise.
* lib/sha1.h: Likewise.
* lib/sha256.h: Likewise.
* lib/sha512.h: Likewise.
* lib/size_max.h: Likewise.
* lib/sm3.h: Likewise.
* lib/stat-size.h: Likewise.
* lib/termcap.h: Likewise.
* lib/terminfo.h: Likewise.
* lib/thread-optim.h: Likewise.
* lib/unlocked-io.h: Likewise.
* lib/vma-iter.h: Likewise.

29 files changed, 149 insertions, 0 deletions

diff --git a/lib/aligned-malloc.h b/lib/aligned-malloc.h
index cc938b608d..f05941f7e4 100644
--- a/lib/aligned-malloc.h
+++ b/lib/aligned-malloc.h
@@ -45,6 +45,12 @@
    returned by memalign() can be freed, but it actually can be freed with
    free().  */
 
+/* This file uses MALLOC_ALIGNMENT, HAVE_POSIX_MEMALIGN, HAVE_ALIGNED_ALLOC,
+   HAVE_MEMALIGN.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #if !defined ALIGNMENT
 # error "ALIGNMENT is not defined"
 #endif
diff --git a/lib/careadlinkat.h b/lib/careadlinkat.h
index 201d0415ff..562cf013b7 100644
--- a/lib/careadlinkat.h
+++ b/lib/careadlinkat.h
@@ -20,6 +20,11 @@
 #ifndef _GL_CAREADLINKAT_H
 #define _GL_CAREADLINKAT_H
 
+/* This file uses HAVE_READLINKAT.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <fcntl.h>
 #include <unistd.h>
 
diff --git a/lib/filemode.h b/lib/filemode.h
index 15a8dcc376..51e10053d2 100644
--- a/lib/filemode.h
+++ b/lib/filemode.h
@@ -18,6 +18,11 @@
 
 #ifndef FILEMODE_H_
 
+/* This file uses HAVE_DECL_STRMODE.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <sys/types.h>
 # include <sys/stat.h>
 
diff --git a/lib/freadptr.h b/lib/freadptr.h
index 1f0f0f94f5..a0fb3a4b7c 100644
--- a/lib/freadptr.h
+++ b/lib/freadptr.h
@@ -14,6 +14,11 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* This file uses HAVE___FREADPTR.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <stddef.h>
 #include <stdio.h>
 
diff --git a/lib/fseterr.h b/lib/fseterr.h
index 0e9d2060ae..87dc347332 100644
--- a/lib/fseterr.h
+++ b/lib/fseterr.h
@@ -17,6 +17,11 @@
 #ifndef _FSETERR_H
 #define _FSETERR_H
 
+/* This file uses HAVE___FSETERR.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <stdio.h>
 
 /* Set the error indicator of the stream FP.
diff --git a/lib/glthread/lock.h b/lib/glthread/lock.h
index ae3ee2d671..805cd1cf61 100644
--- a/lib/glthread/lock.h
+++ b/lib/glthread/lock.h
@@ -77,6 +77,14 @@
 #ifndef _LOCK_H
 #define _LOCK_H
 
+/* This file uses HAVE_THREADS_H, HAVE_PTHREAD_RWLOCK,
+   HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER,
+   PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP,
+   HAVE_PTHREAD_MUTEX_RECURSIVE.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <errno.h>
 #include <stdlib.h>
 
diff --git a/lib/glthread/tls.h b/lib/glthread/tls.h
index aaaf0bb3b7..4788fae4f5 100644
--- a/lib/glthread/tls.h
+++ b/lib/glthread/tls.h
@@ -43,6 +43,11 @@
 #ifndef _TLS_H
 #define _TLS_H
 
+/* This file uses HAVE_THREADS_H.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <errno.h>
 #include <stdlib.h>
 
diff --git a/lib/immutable.h b/lib/immutable.h
index c76c625e31..6c5583261e 100644
--- a/lib/immutable.h
+++ b/lib/immutable.h
@@ -50,6 +50,11 @@
    functions work alike, except that the "read-only" pointers are actually
    writable.  */
 
+/* This file uses HAVE_WORKING_MPROTECT.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <stddef.h>
 
 #ifdef __cplusplus
diff --git a/lib/isapipe.h b/lib/isapipe.h
index 50a19c43b2..1a3f9c7bba 100644
--- a/lib/isapipe.h
+++ b/lib/isapipe.h
@@ -15,6 +15,11 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* This file uses HAVE_FIFO_PIPES.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* Whether pipes are FIFOs; -1 if not known.  */
 #ifndef HAVE_FIFO_PIPES
 # define HAVE_FIFO_PIPES (-1)
diff --git a/lib/isnand-nolibm.h b/lib/isnand-nolibm.h
index 9c75a8c47b..bb5a38b39f 100644
--- a/lib/isnand-nolibm.h
+++ b/lib/isnand-nolibm.h
@@ -14,6 +14,11 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* This file uses HAVE_ISNAND_IN_LIBC.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #if HAVE_ISNAND_IN_LIBC
 /* Get declaration of isnan macro.  */
 # include <math.h>
diff --git a/lib/isnanf-nolibm.h b/lib/isnanf-nolibm.h
index cc6b4198ff..f4bcba143e 100644
--- a/lib/isnanf-nolibm.h
+++ b/lib/isnanf-nolibm.h
@@ -14,6 +14,11 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* This file uses HAVE_ISNANF_IN_LIBC.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #if HAVE_ISNANF_IN_LIBC
 /* Get declaration of isnan macro or (older) isnanf function.  */
 # include <math.h>
diff --git a/lib/isnanl-nolibm.h b/lib/isnanl-nolibm.h
index f04c489bb8..8becc5b409 100644
--- a/lib/isnanl-nolibm.h
+++ b/lib/isnanl-nolibm.h
@@ -14,6 +14,11 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* This file uses HAVE_ISNANL_IN_LIBC.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #if HAVE_ISNANL_IN_LIBC
 /* Get declaration of isnan macro or (older) isnanl function.  */
 # include <math.h>
diff --git a/lib/mbswidth.h b/lib/mbswidth.h
index 5e4fc15b83..f385b64999 100644
--- a/lib/mbswidth.h
+++ b/lib/mbswidth.h
@@ -14,6 +14,11 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
+/* This file uses HAVE_DECL_MBSWIDTH_IN_WCHAR_H.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <stddef.h>
 
 /* Avoid a clash of our mbswidth() with a function of the same name defined
diff --git a/lib/md5.h b/lib/md5.h
index f34e7cb8df..92dc603898 100644
--- a/lib/md5.h
+++ b/lib/md5.h
@@ -20,6 +20,11 @@
 #ifndef _MD5_H
 #define _MD5_H 1
 
+/* This file uses HAVE_OPENSSL_MD5.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <stdio.h>
 #include <stdint.h>
 
diff --git a/lib/minmax.h b/lib/minmax.h
index 1fbfc6616c..0ac40198e2 100644
--- a/lib/minmax.h
+++ b/lib/minmax.h
@@ -23,6 +23,11 @@
    MIN, MAX macro redefinitions on some systems; the workaround is to
    #include this file as the last one among the #include list.  */
 
+/* This file uses HAVE_MINMAX_IN_LIMITS_H, HAVE_MINMAX_IN_SYS_PARAM_H.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* Before we define the following symbols we get the <limits.h> file
    since otherwise we get redefinitions on some systems if <limits.h> is
    included after this file.  Likewise for <sys/param.h>.
diff --git a/lib/msvc-inval.h b/lib/msvc-inval.h
index ed00461ff7..c16d880178 100644
--- a/lib/msvc-inval.h
+++ b/lib/msvc-inval.h
@@ -52,6 +52,11 @@
        AC_DEFINE([MSVC_INVALID_PARAMETER_HANDLING], [SANE_LIBRARY_HANDLING])
  */
 
+/* This file uses HAVE_MSVC_INVALID_PARAMETER_HANDLER.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #define DEFAULT_HANDLING       0
 #define HAIRY_LIBRARY_HANDLING 1
 #define SANE_LIBRARY_HANDLING  2
diff --git a/lib/msvc-nothrow.h b/lib/msvc-nothrow.h
index 82d3f6a2df..0dd229fd66 100644
--- a/lib/msvc-nothrow.h
+++ b/lib/msvc-nothrow.h
@@ -25,6 +25,11 @@
    This file defines wrappers that turn such an invalid parameter notification
    into an error code.  */
 
+/* This file uses HAVE_MSVC_INVALID_PARAMETER_HANDLER.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #if defined _WIN32 && ! defined __CYGWIN__
 
 /* Get original declaration of _get_osfhandle.  */
diff --git a/lib/pathmax.h b/lib/pathmax.h
index 0dd8f3bc5c..6930283b82 100644
--- a/lib/pathmax.h
+++ b/lib/pathmax.h
@@ -39,6 +39,11 @@
          #endif
  */
 
+/* This file uses HAVE_SYS_PARAM_H.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <unistd.h>
 
 # include <limits.h>
diff --git a/lib/sha1.h b/lib/sha1.h
index 5a58b567ce..854213a921 100644
--- a/lib/sha1.h
+++ b/lib/sha1.h
@@ -19,6 +19,11 @@
 #ifndef SHA1_H
 # define SHA1_H 1
 
+/* This file uses HAVE_OPENSSL_SHA1.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <stdio.h>
 # include <stdint.h>
 
diff --git a/lib/sha256.h b/lib/sha256.h
index 2879477e89..938b106706 100644
--- a/lib/sha256.h
+++ b/lib/sha256.h
@@ -18,6 +18,11 @@
 #ifndef SHA256_H
 # define SHA256_H 1
 
+/* This file uses HAVE_OPENSSL_SHA256.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <stdio.h>
 # include <stdint.h>
 
diff --git a/lib/sha512.h b/lib/sha512.h
index e3a98a2644..f3465bc8a6 100644
--- a/lib/sha512.h
+++ b/lib/sha512.h
@@ -18,6 +18,11 @@
 #ifndef SHA512_H
 # define SHA512_H 1
 
+/* This file uses HAVE_OPENSSL_SHA512.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <stdio.h>
 # include "u64.h"
 
diff --git a/lib/size_max.h b/lib/size_max.h
index 48af025055..2cfd31a59b 100644
--- a/lib/size_max.h
+++ b/lib/size_max.h
@@ -18,6 +18,11 @@
 #ifndef GNULIB_SIZE_MAX_H
 #define GNULIB_SIZE_MAX_H
 
+/* This file uses HAVE_STDINT_H.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* Get SIZE_MAX declaration on systems like Solaris 7/8/9.  */
 # include <limits.h>
 /* Get SIZE_MAX declaration on systems like glibc 2.  */
diff --git a/lib/sm3.h b/lib/sm3.h
index 4ca7f7a103..28af4dff1c 100644
--- a/lib/sm3.h
+++ b/lib/sm3.h
@@ -27,6 +27,11 @@
 #ifndef SM3_H
 # define SM3_H 1
 
+/* This file uses HAVE_OPENSSL_SM3.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <stdio.h>
 # include <stdint.h>
 
diff --git a/lib/stat-size.h b/lib/stat-size.h
index 48f0d3c356..bda00b7289 100644
--- a/lib/stat-size.h
+++ b/lib/stat-size.h
@@ -25,6 +25,11 @@
 #ifndef STAT_SIZE_H
 #define STAT_SIZE_H
 
+/* This file uses HAVE_SYS_PARAM_H, HAVE_STRUCT_STAT_ST_BLOCKS.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* sys/param.h may define DEV_BSIZE */
 #if HAVE_SYS_PARAM_H
 # include <sys/param.h>
diff --git a/lib/termcap.h b/lib/termcap.h
index 93d78e2227..f56543558a 100644
--- a/lib/termcap.h
+++ b/lib/termcap.h
@@ -19,6 +19,11 @@
 #ifndef _TERMCAP_H
 #define _TERMCAP_H
 
+/* This file uses HAVE_TERMCAP, HAVE_TERMINFO, HAVE_TPARAM.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* Including <curses.h> or <term.h> is dangerous, because it also declares
    a lot of junk, such as variables PC, UP, and other.  */
 
diff --git a/lib/terminfo.h b/lib/terminfo.h
index 0b6aacbb76..eb0b3c855d 100644
--- a/lib/terminfo.h
+++ b/lib/terminfo.h
@@ -19,6 +19,11 @@
 #ifndef _TERMINFO_H
 #define _TERMINFO_H
 
+/* This file uses HAVE_TERMINFO, HAVE_TERMCAP, HAVE_TPARAM.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 /* Including <curses.h> or <term.h> is dangerous, because it also declares
    a lot of junk, such as variables PC, UP, and other.  */
 
diff --git a/lib/thread-optim.h b/lib/thread-optim.h
index 9a4c80af32..b5ef15aaf4 100644
--- a/lib/thread-optim.h
+++ b/lib/thread-optim.h
@@ -50,6 +50,11 @@
    same optimization cannot be applied to locks that synchronize different
    processes (e.g. through shared memory mappings).  */
 
+/* This file uses HAVE_SYS_SINGLE_THREADED_H.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #if HAVE_SYS_SINGLE_THREADED_H /* glibc >= 2.32 */
 # include <sys/single_threaded.h>
 # define gl_multithreaded()  (!__libc_single_threaded)
diff --git a/lib/unlocked-io.h b/lib/unlocked-io.h
index fdef624ab9..4830df4a74 100644
--- a/lib/unlocked-io.h
+++ b/lib/unlocked-io.h
@@ -31,6 +31,11 @@
    the *_unlocked functions directly.  On hosts that lack those
    functions, invoke the non-thread-safe versions instead.  */
 
+/* This file uses HAVE_DECL_*_UNLOCKED.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <stdio.h>
 
 # if HAVE_DECL_CLEARERR_UNLOCKED || defined clearerr_unlocked
diff --git a/lib/vma-iter.h b/lib/vma-iter.h
index d181184aee..f89c8f0322 100644
--- a/lib/vma-iter.h
+++ b/lib/vma-iter.h
@@ -18,6 +18,11 @@
 #ifndef _VMA_ITER_H
 #define _VMA_ITER_H
 
+/* This file uses HAVE_PSTAT_GETPROCVM, HAVE_MQUERY.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
 #include <stdint.h>
 
 #ifdef __cplusplus