ensure types of PL_nan and PL_inf are consistent

Different types for a variable across compilation units can in
theory cause undefined behavior.  In this case I think it's unlikely
to cause an issue, but LTO builds also (correctly) complain about
the type mismatch, so ensure they match.

1 files changed, 17 insertions, 0 deletions

diff --git a/perl.h b/perl.h
index 6d771e2340..6c3cb6d669 100644
--- a/perl.h
+++ b/perl.h
@@ -7974,8 +7974,25 @@ GCC_DIAG_RESTORE_DECL;
 
 #else
 
+/* The declarations here need to match the initializations done above,
+   since a mismatch across compilation units causes undefined
+   behavior.  It also prevents warnings from LTO builds.
+*/
+#  if !defined(USE_QUADMATH) && \
+       (NVSIZE == LONG_DOUBLESIZE && defined(LONGDBLINFBYTES) ||   \
+        NVSIZE == DOUBLESIZE && defined(DOUBLEINFBYTES))
+INFNAN_U8_NV_DECL PL_inf;
+#  else
 INFNAN_NV_U8_DECL PL_inf;
+#  endif
+
+#  if !defined(USE_QUADMATH) && \
+       (NVSIZE == LONG_DOUBLESIZE && defined(LONGDBLNANBYTES) ||   \
+        NVSIZE == DOUBLESIZE && defined(DOUBLENANBYTES))
+INFNAN_U8_NV_DECL PL_nan;
+#  else
 INFNAN_NV_U8_DECL PL_nan;
+#  endif
 
 #endif