Fix final link of notmuch binary to use C compiler if possible.

On Linux, a C program that depends on a C library which in turn
depends on a C++ can be linked with the C compiler, (avoiding a direct
link from the program to the C++ runtime libraries).

Other platforms with less fancy linkers need to use the C++ compiler
for this linking.

diff --git a/Makefile.local b/Makefile.local
index b338d8b2a2d26640cc781091ee9c22ec77c11c82..51a83a8c7b3635b1f47a50edf525538fc261a44b 100644 (file)
--- a/Makefile.local
+++ b/Makefile.local
@@ -32,8 +32,10 @@ GPG_FILE=$(SHA1_FILE).asc
 FINAL_CFLAGS = -DNOTMUCH_VERSION=$(VERSION) $(CFLAGS) $(WARN_CFLAGS) $(CONFIGURE_CFLAGS) $(extra_cflags)
 FINAL_CXXFLAGS = $(CXXFLAGS) $(WARN_CXXFLAGS) $(CONFIGURE_CXXFLAGS) $(extra_cflags) $(extra_cxxflags)
 FINAL_NOTMUCH_LDFLAGS = $(LDFLAGS) -Llib -lnotmuch
+FINAL_NOTMUCH_LINKER = CC
 ifneq ($(LINKER_RESOLVES_LIBRARY_DEPENDENCIES),1)
 FINAL_NOTMUCH_LDFLAGS += $(CONFIGURE_LDFLAGS)
+FINAL_NOTMUCH_LINKER = CXX
 endif
 FINAL_LIBNOTMUCH_LDFLAGS = $(LDFLAGS) $(CONFIGURE_LDFLAGS)
 
@@ -235,7 +237,7 @@ notmuch: $(notmuch_client_modules) lib/libnotmuch.a
        $(call quiet,CXX $(CFLAGS)) $^ $(FINAL_LIBNOTMUCH_LDFLAGS) -o $@
 
 notmuch-shared: $(notmuch_client_modules) lib/$(LINKER_NAME)
-       $(call quiet,CXX $(CFLAGS)) $(notmuch_client_modules) $(FINAL_NOTMUCH_LDFLAGS) -o $@
+       $(call quiet,$(FINAL_NOTMUCH_LINKER) $(CFLAGS)) $(notmuch_client_modules) $(FINAL_NOTMUCH_LDFLAGS) -o $@
 
 notmuch.1.gz: notmuch.1
        gzip --stdout $^ > $@