1 files changed, 114 insertions, 0 deletions
diff --git a/m4/ax_cc.m4 b/m4/ax_cc.m4
new file mode 100644
index 0000000..57bf94b
--- /dev/null
+++ b/m4/ax_cc.m4
@@ -0,0 +1,114 @@
+dnl #
+dnl # check if were compiling with CLANG, autoconf GCC macro identifies CLANG as GCC
+dnl #
+AC_DEFUN([AX_CC_IS_CLANG],[
+  AC_CACHE_CHECK([if compiler is clang], [ax_cv_cc_clang],[
+
+  AC_COMPILE_IFELSE(
+    [AC_LANG_PROGRAM([], [[
+    #ifndef __clang__
+         not clang
+    #endif
+    ]])],
+    [ax_cv_cc_clang=yes],
+    [ax_cv_cc_clang=no])
+  ])
+])
+
+AC_DEFUN([AX_CC_QUNUSED_ARGUMENTS_FLAG],[
+  AC_CACHE_CHECK([for the compiler flag "-Qunused-arguments"], [ax_cv_cc_qunused_arguments_flag],[
+
+    CFLAGS_SAVED=$CFLAGS
+    CFLAGS="$CFLAGS -Werror -Qunused-arguments -foobar"
+    
+    AC_LANG_PUSH(C)
+    AC_TRY_COMPILE(
+      [],
+      [return 0;],
+      [ax_cv_cc_qunused_arguments_flag="yes"],
+      [ax_cv_cc_qunused_arguments_flag="no"])
+    AC_LANG_POP
+
+    CFLAGS="$CFLAGS_SAVED"
+  ])
+])
+
+AC_DEFUN([AX_CC_WDOCUMENTATION_FLAG],[
+  AC_CACHE_CHECK([for the compiler flag "-Wdocumentation"], [ax_cv_cc_wdocumentation_flag],[
+
+    CFLAGS_SAVED=$CFLAGS
+    CFLAGS="$CFLAGS -Werror -Wdocumentation"
+
+    AC_LANG_PUSH(C)
+    AC_TRY_COMPILE(
+      [],
+      [return 0;],
+      [ax_cv_cc_wdocumentation_flag="yes"],
+      [ax_cv_cc_wdocumentation_flag="no"])
+    AC_LANG_POP
+
+    CFLAGS="$CFLAGS_SAVED"
+  ])
+])
+
+dnl #
+dnl # Determine the number of system cores we have
+dnl #
+AC_DEFUN([AX_SYSTEM_CORES],[
+  AC_CACHE_CHECK([number of system cores], [ax_cv_system_cores],
+    [
+      AC_LANG_PUSH(C)
+      AC_TRY_RUN(
+        [
+          #include <stdio.h>
+          #include <stdint.h>
+          #ifdef _WIN32
+          #  include <windows.h>
+          #elif MACOS
+          #  include <sys/param.h>
+          #  include <sys/sysctl.h>
+          #else
+          #  include <unistd.h>
+          #endif
+          
+          int main (int argc, char *argv[])
+          {
+            uint32_t count;
+            
+            #ifdef WIN32
+            SYSTEM_INFO sysinfo;
+            GetSystemInfo(&sysinfo);
+      
+            count = sysinfo.dwNumberOfProcessors;
+            
+            #elif MACOS
+            int nm[2];
+            size_t len = 4;
+      
+            nm[0] = CTL_HW;
+            nm[1] = HW_AVAILCPU;
+            sysctl(nm, 2, &count, &len, NULL, 0);
+      
+            if(count < 1) {
+              nm[1] = HW_NCPU;
+              sysctl(nm, 2, &count, &len, NULL, 0);
+              if(count < 1) {
+                count = 1;
+              }
+            }
+            
+            #else
+      	    count = sysconf(_SC_NPROCESSORS_ONLN);
+            #endif
+
+            return count;
+          }
+        ],
+        [ax_cv_system_cores=$?],
+        [ax_cv_system_cores=$?],
+        [ax_cv_system_cores=]
+    )
+    AC_LANG_POP
+  ])
+])
+