Removes pre-C99 build and header cruft (#700)

* Committing clang-format changes

* Removes pre-C99 build and header cruft

* Assumes ANSI C headers exist
* Assumes stdbool.h, stdint.h, and inttypes.h are present
* Assumes the C++ compiler can handle stdint.h
* Removes all work-arounds for missing functionality, especially stdbool.h

* Formats source

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

3 files changed, 3 insertions, 36 deletions

diff --git a/config/cmake_ext_mod/ConfigureChecks.cmake b/config/cmake_ext_mod/ConfigureChecks.cmake
index 38b5ab3..12510eb 100644
--- a/config/cmake_ext_mod/ConfigureChecks.cmake
+++ b/config/cmake_ext_mod/ConfigureChecks.cmake
@@ -120,7 +120,6 @@ CHECK_INCLUDE_FILE_CONCAT ("features.h"      ${HDF_PREFIX}_HAVE_FEATURES_H)
 CHECK_INCLUDE_FILE_CONCAT ("dirent.h"        ${HDF_PREFIX}_HAVE_DIRENT_H)
 CHECK_INCLUDE_FILE_CONCAT ("setjmp.h"        ${HDF_PREFIX}_HAVE_SETJMP_H)
 CHECK_INCLUDE_FILE_CONCAT ("stddef.h"        ${HDF_PREFIX}_HAVE_STDDEF_H)
-CHECK_INCLUDE_FILE_CONCAT ("stdint.h"        ${HDF_PREFIX}_HAVE_STDINT_H)
 CHECK_INCLUDE_FILE_CONCAT ("unistd.h"        ${HDF_PREFIX}_HAVE_UNISTD_H)
 
 # Windows
@@ -146,12 +145,9 @@ CHECK_INCLUDE_FILE_CONCAT ("strings.h"       ${HDF_PREFIX}_HAVE_STRINGS_H)
 CHECK_INCLUDE_FILE_CONCAT ("stdlib.h"        ${HDF_PREFIX}_HAVE_STDLIB_H)
 CHECK_INCLUDE_FILE_CONCAT ("memory.h"        ${HDF_PREFIX}_HAVE_MEMORY_H)
 CHECK_INCLUDE_FILE_CONCAT ("dlfcn.h"         ${HDF_PREFIX}_HAVE_DLFCN_H)
-CHECK_INCLUDE_FILE_CONCAT ("inttypes.h"      ${HDF_PREFIX}_HAVE_INTTYPES_H)
 CHECK_INCLUDE_FILE_CONCAT ("netinet/in.h"    ${HDF_PREFIX}_HAVE_NETINET_IN_H)
 CHECK_INCLUDE_FILE_CONCAT ("netdb.h"         ${HDF_PREFIX}_HAVE_NETDB_H)
 CHECK_INCLUDE_FILE_CONCAT ("arpa/inet.h"     ${HDF_PREFIX}_HAVE_ARPA_INET_H)
-# _Bool type support
-CHECK_INCLUDE_FILE_CONCAT (stdbool.h    ${HDF_PREFIX}_HAVE_STDBOOL_H)
 
 ## Check for non-standard extenstion quadmath.h
 
@@ -238,11 +234,6 @@ macro (HDF_FUNCTION_TEST OTHER_TEST)
 endmacro ()
 
 #-----------------------------------------------------------------------------
-# Check for these functions before the time headers are checked
-#-----------------------------------------------------------------------------
-HDF_FUNCTION_TEST (STDC_HEADERS)
-
-#-----------------------------------------------------------------------------
 #  Check for large file support
 #-----------------------------------------------------------------------------
 
@@ -416,13 +407,9 @@ HDF_CHECK_TYPE_SIZE (time_t          ${HDF_PREFIX}_SIZEOF_TIME_T)
 # Extra C99 types
 #-----------------------------------------------------------------------------
 
-# _Bool type support
-if (HAVE_STDBOOL_H)
-  set (CMAKE_EXTRA_INCLUDE_FILES stdbool.h)
-  HDF_CHECK_TYPE_SIZE (bool         ${HDF_PREFIX}_SIZEOF_BOOL)
-else ()
-  HDF_CHECK_TYPE_SIZE (_Bool        ${HDF_PREFIX}_SIZEOF_BOOL)
-endif ()
+# Size of bool
+set (CMAKE_EXTRA_INCLUDE_FILES stdbool.h)
+HDF_CHECK_TYPE_SIZE (_Bool        ${HDF_PREFIX}_SIZEOF_BOOL)
 
 if (MINGW OR NOT WINDOWS)
   #-----------------------------------------------------------------------------
@@ -554,7 +541,6 @@ if (MINGW OR NOT WINDOWS)
   foreach (other_test
       HAVE_ATTRIBUTE
       HAVE_C99_FUNC
-#      STDC_HEADERS
       HAVE_FUNCTION
       HAVE_C99_DESIGNATED_INITIALIZER
       SYSTEM_SCOPE_THREADS
diff --git a/config/cmake_ext_mod/HDFTests.c b/config/cmake_ext_mod/HDFTests.c
index 2d7e1b4..0c3b7b7 100644
--- a/config/cmake_ext_mod/HDFTests.c
+++ b/config/cmake_ext_mod/HDFTests.c
@@ -88,14 +88,6 @@ int main(void)
 }
 #endif
 
-#ifdef STDC_HEADERS
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <float.h>
-int main() { return 0; }
-#endif /* STDC_HEADERS */
-
 
 #ifdef HAVE_ATTRIBUTE
 
diff --git a/config/cmake_ext_mod/HDFUseCXX.cmake b/config/cmake_ext_mod/HDFUseCXX.cmake
index 580c409..423f74a 100644
--- a/config/cmake_ext_mod/HDFUseCXX.cmake
+++ b/config/cmake_ext_mod/HDFUseCXX.cmake
@@ -32,17 +32,6 @@ endif ()
 include (CheckIncludeFileCXX)
 include (TestForSTDNamespace)
 
-# IF the c compiler found stdint, check the C++ as well. On some systems this
-# file will be found by C but not C++, only do this test IF the C++ compiler
-# has been initialized (e.g. the project also includes some c++)
-if (${HDF_PREFIX}_HAVE_STDINT_H AND CMAKE_CXX_COMPILER_LOADED)
-  CHECK_INCLUDE_FILE_CXX ("stdint.h" ${HDF_PREFIX}_HAVE_STDINT_H_CXX)
-  if (NOT ${HDF_PREFIX}_HAVE_STDINT_H_CXX)
-    set (${HDF_PREFIX}_HAVE_STDINT_H "" CACHE INTERNAL "Have includes HAVE_STDINT_H")
-    set (USE_INCLUDES ${USE_INCLUDES} "stdint.h")
-  endif ()
-endif ()
-
 # For other CXX specific tests, use this MACRO.
 macro (HDF_CXX_FUNCTION_TEST OTHER_TEST)
   if (NOT DEFINED ${OTHER_TEST})