Merge branch 'PHP-7.4'

* PHP-7.4:
  Implement FR #77230: Support custom CFLAGS and LDFLAGS from environment

Author: cmb69

win32/build/confutils.js

@@ -431,6 +431,10 @@ can be built that way. \
 			}
 			STDOUT.WriteLine("  " + arg.arg + pad + word_wrap_and_indent(max_width + 5, arg.helptext));
 		}
+		STDOUT.WriteBlankLines(1);
+		STDOUT.WriteLine("Some influential environment variables:");
+		STDOUT.WriteLine("  CFLAGS      C compiler flags");
+		STDOUT.WriteLine("  LDFLAGS     linker flags");
 		WScript.Quit(1);
 	}
 
@@ -3207,6 +3211,8 @@ function toolset_setup_linker()
 
 function toolset_setup_common_cflags()
 {
+	var envCFLAGS = WshShell.Environment("PROCESS").Item("CFLAGS");
+
 	// CFLAGS for building the PHP dll
 	DEFINE("CFLAGS_PHP", "/D _USRDLL /D PHP7DLLTS_EXPORTS /D PHP_EXPORTS \
 	/D LIBZEND_EXPORTS /D TSRM_EXPORTS /D SAPI_EXPORTS /D WINVER=" + WINVER);
@@ -3218,6 +3224,10 @@ function toolset_setup_common_cflags()
 		/D ZEND_WIN32=1 /D PHP_WIN32=1 /D WIN32 /D _MBCS /W3 \
 		/D _USE_MATH_DEFINES");
 
+	if (envCFLAGS) {
+		ADD_FLAG("CFLAGS", envCFLAGS);
+	}
+
 	if (VS_TOOLSET) {
 		ADD_FLAG("CFLAGS", " /FD ");
 
@@ -3368,6 +3378,8 @@ function toolset_setup_intrinsic_cflags()
 
 function toolset_setup_common_ldlags()
 {
+	var envLDFLAGS = WshShell.Environment("PROCESS").Item("LDFLAGS");
+
 	// General DLL link flags
 	DEFINE("DLL_LDFLAGS", "/dll ");
 
@@ -3376,6 +3388,10 @@ function toolset_setup_common_ldlags()
 
 	DEFINE("LDFLAGS", "/nologo ");
 
+	if (envLDFLAGS) {
+		ADD_FLAG("LDFLAGS", envLDFLAGS);
+	}
+
 	// we want msvcrt in the PHP DLL
 	ADD_FLAG("PHP_LDFLAGS", "/nodefaultlib:libcmt");