Add additional CheckFunc test cases and update change notice for CheckFunc.

Changes:
* add additional CheckFunc test cases to SCons/SConfTests.py
* add paragraph tags around change notice for CheckFunc funcargs argument in doc/man/scons.xml

Author: jcbrill

SCons/SConfTests.py

@@ -671,12 +671,25 @@ def test_CheckFunc(self) -> None:
                                  log_file=self.test.workpath('config.log'))
 
         try:
-            # CheckFunc()
+            # look for function using default heading
             r = sconf.CheckFunc('strcpy')
             assert r, "did not find strcpy"
+            # no default heading, supply dummy signature
             r = sconf.CheckFunc('strcpy', '/* header */ char strcpy();')
             assert r, "did not find strcpy"
+            # ... supply complete signature, and function args
             r = sconf.CheckFunc('strcpy', header='/* header */ char *strcpy(char *dest, char *src);', funcargs='"", ""')
+            # ... supply standard header for prototype, and function args
+            assert r, "did not find strcpy"
+            r = sconf.CheckFunc('strcpy', header='#include <string.h>', funcargs='"", ""')
+            # also try in C++ mode
+            cpp_header = """\
+#ifdef __cplusplus
+extern "C"
+#endif
+char *strcpy(char *dest, char *src);
+"""
+            r = sconf.CheckFunc('strcpy', header=cpp_header, funcargs='"", ""', language="C++")
             assert r, "did not find strcpy"
             r = sconf.CheckFunc('hopefullynofunction')
             assert not r, "unexpectedly found hopefullynofunction"

doc/man/scons.xml

@@ -3993,7 +3993,9 @@ Note: if <parameter>header</parameter> is supplied,
   by using the <parameter>funcargs</parameter>.
 </para>
 
+<para>
 <emphasis>Changed in version 4.7.0: added the <parameter>funcargs</parameter>.</emphasis>
+</para>
 
 <para>Returns a boolean indicating success or failure.</para>
   </listitem>