Add override, update ChangeLog

Author: eddelbuettel

ChangeLog

@@ -1,3 +1,14 @@
+2025-11-24  Dirk Eddelbuettel  <edd@debian.org>
+
+	* inst/include/Rcpp/r/check_r_headers.h: Add RCPP_NO_R_HEADERS_CHECK
+	override to skip new check
+
+2025-11-23  Dirk Eddelbuettel  <edd@debian.org>
+
+	* inst/include/Rcpp/r/check_r_headers.h: New header to check if R.h
+	or related R headers were installed first
+	* inst/include/RcppCommon.h: Call new header as first thing
+
 2025-11-04  Dirk Eddelbuettel  <edd@debian.org>
 
 	* .github/workflows/macos.yaml (jobs): Roll macos-13 to macos-14

inst/include/Rcpp/r/check_r_headers.h

@@ -20,20 +20,25 @@
 #ifndef RCPP__CHECK__R__HEADERS__H
 #define RCPP__CHECK__R__HEADERS__H
 
-#if defined(R_R_H) & defined(USING_R)
-#pragma message "R.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is generally not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
-#endif
+// Allow an escape hatch
+#if !defined(RCPP_NO_R_HEADERS_CHECK)
 
-#if defined(RINTERFACE_H_)
-#pragma message "Rinterface.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
-#endif
+  #if defined(R_R_H) & defined(USING_R)
+    #pragma message "R.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is generally not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
+  #endif
 
-#if defined(R_INTERNALS_H_)
-#pragma message "Rinternals.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is generally not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
-#endif
+  #if defined(RINTERFACE_H_)
+    #pragma message "Rinterface.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
+  #endif
 
-#if defined(R_DEFINES_H_)
-#pragma message "Rdefines.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is generally not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
-#endif
+  #if defined(R_INTERNALS_H_)
+    #pragma message "Rinternals.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is generally not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
+  #endif
 
-#endif
+  #if defined(R_DEFINES_H_)
+    #pragma message "Rdefines.h has been included before any Rcpp headers. This can lead to hard-to-debug errors, and is generally not necessary. See https://github.com/RcppCore/Rcpp/issues/1410"
+  #endif
+
+#endif  // escape hatch '!defined(RCPP_NO_R_HEADERS_CHECK)'
+
+#endif  // header guard

inst/include/RcppCommon.h

@@ -4,7 +4,7 @@
 //
 // Copyright (C) 2008 - 2009  Dirk Eddelbuettel
 // Copyright (C) 2009 - 2020  Dirk Eddelbuettel and Romain Francois
-// Copyright (C) 2021         Dirk Eddelbuettel, Romain Francois and Iñaki Ucar
+// Copyright (C) 2021 - 2025  Dirk Eddelbuettel, Romain Francois and Iñaki Ucar
 //
 // This file is part of Rcpp.
 //