[devhelp/wip/completion: 1/2] build: be able to unit-test private functions

[Sébastien Wilmet <swilmet src gnome org>]

commit 35857c46564a067b409bbc06410f21f8fba09d03
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Jan 6 10:45:28 2018 +0100

    build: be able to unit-test private functions
    
    I've documented this technique here:
    https://blogs.gnome.org/swilmet/2016/04/17/libtool-convenience-library-to-unit-test-private-functions/

 src/Makefile.am        |   31 +++++++++++++++++++++----------
 unit-tests/Makefile.am |    2 +-
 2 files changed, 22 insertions(+), 11 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 574e80f..46cb1be 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -79,30 +79,41 @@ BUILT_SOURCES =                     \
        $(libdevhelp_built_sources)     \
        $(NULL)
 
-# The library
-lib_LTLIBRARIES = libdevhelp-3.la
-
-devhelpincludedir = $(includedir)/devhelp-3.0/devhelp
-devhelpinclude_HEADERS = $(libdevhelp_public_headers)
-nodist_devhelpinclude_HEADERS = $(libdevhelp_built_public_headers)
+# Helper Libtool library, so that the private functions can be used in unit
+# tests.
+noinst_LTLIBRARIES = libdevhelp-core.la
 
-libdevhelp_3_la_SOURCES =              \
+libdevhelp_core_la_SOURCES =           \
        $(libdevhelp_public_headers)    \
        $(libdevhelp_public_c_files)    \
        $(libdevhelp_private_headers)   \
        $(libdevhelp_private_c_files)
 
 # Do not distribute generated files.
-nodist_libdevhelp_3_la_SOURCES =       \
+nodist_libdevhelp_core_la_SOURCES =    \
        $(libdevhelp_built_sources)
 
-libdevhelp_3_la_CPPFLAGS =     \
+libdevhelp_core_la_CPPFLAGS =  \
        $(AM_CPPFLAGS)
 
-libdevhelp_3_la_CFLAGS =       \
+libdevhelp_core_la_CFLAGS =    \
        $(DEVHELP_CFLAGS)
 
+libdevhelp_core_la_LDFLAGS =   \
+       $(AM_LDFLAGS)           \
+       -no-undefined
+
+# The library
+lib_LTLIBRARIES = libdevhelp-3.la
+
+devhelpincludedir = $(includedir)/devhelp-3.0/devhelp
+devhelpinclude_HEADERS = $(libdevhelp_public_headers)
+nodist_devhelpinclude_HEADERS = $(libdevhelp_built_public_headers)
+
+libdevhelp_3_la_SOURCES =
+
 libdevhelp_3_la_LIBADD =       \
+       libdevhelp-core.la      \
        $(DEVHELP_LIBS)         \
        $(LIBM)
 
diff --git a/unit-tests/Makefile.am b/unit-tests/Makefile.am
index 66c58c2..64c029f 100644
--- a/unit-tests/Makefile.am
+++ b/unit-tests/Makefile.am
@@ -6,7 +6,7 @@ AM_CPPFLAGS =                   \
 
 AM_LDFLAGS = $(WARN_LDFLAGS)
 
-LDADD = $(top_builddir)/src/libdevhelp-3.la    \
+LDADD = $(top_builddir)/src/libdevhelp-core.la \
        $(DEVHELP_LIBS)                         \
        $(LIBM)