[newlib-cygwin] Cygwin: Use standard CXXFLAGS when compiling localtime_wrapper.c

[Jon TURNEY]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=47e698cc04109a188d8bba6be8f7fe2e307410a4

commit 47e698cc04109a188d8bba6be8f7fe2e307410a4
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Thu Nov 19 21:38:47 2020 +0000

    Cygwin: Use standard CXXFLAGS when compiling localtime_wrapper.c
    
    This has an separate, explicit compilation rule which omits CXXFLAGS, so
    expected flags like '-g -O2' aren't being used.

Diff:
---
 winsup/cygwin/Makefile.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/Makefile.in b/winsup/cygwin/Makefile.in
index ccff86eea..b15c746cf 100644
--- a/winsup/cygwin/Makefile.in
+++ b/winsup/cygwin/Makefile.in
@@ -698,7 +698,7 @@ localtime.patched.c: tzcode/localtime.c tzcode/localtime.c.patch
 		    $(srcdir)/tzcode/localtime.c.patch
 
 localtime.o: tzcode/localtime_wrapper.c localtime.patched.c
-	$(CC) ${COMMON_CFLAGS} ${localtime_CFLAGS} \
+	$(CC) $(CXXFLAGS) ${COMMON_CFLAGS} ${localtime_CFLAGS} \
 		-I$(target_builddir)/winsup/cygwin \
 		-I$(srcdir) -I$(srcdir)/tzcode -c -o $@ $<