From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Wed, 1 Sep 2021 05:27:25 +0000 (+0200)
Subject: gvpack_static: force the C++ compiler to be used also for static linking
X-Git-Tag: 2.49.1~35^2~4
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=943f8145adc8d694d263ddcd005fd5ae8d685c46;p=graphviz

gvpack_static: force the C++ compiler to be used also for static linking

The trick to force the C++ compiler to be used for linking was applied
only for gvpack, not for gvpack_static.

Fixes many errors like this:

/usr/bin/ld: ../../lib/vpsc/.libs/libvpsc_C.a(csolve_VPSC.o): in function `newVariable':
csolve_VPSC.cpp:(.text+0x20): undefined reference to `operator new(unsigned long)'
---

diff --git a/cmd/tools/Makefile.am b/cmd/tools/Makefile.am
index 89e8352d2..966bb86f5 100644
--- a/cmd/tools/Makefile.am
+++ b/cmd/tools/Makefile.am
@@ -265,6 +265,10 @@ gvpack_static_LDADD = \
 	$(top_builddir)/lib/cgraph/libcgraph_C.la \
 	$(top_builddir)/lib/cdt/libcdt_C.la \
 		$(EXPAT_LIBS) $(Z_LIBS) $(GTS_LIBS) $(SOCKET_LIBS) $(IPSEPCOLA_LIBS) $(MATH_LIBS)
+
+# add a non-existent C++ source to force the C++ compiler to be used for
+# linking, so the C++ standard library is included for our C++ dependencies
+nodist_EXTRA_gvpack_static_SOURCES = fake.cxx
 endif
 
 if ENABLE_MAN_PDFS