Merge makefiles: test for support of flto-partition flag

Test for compiler support of "-flto-partition=none" flag before passing
it.

Fixes: https://gitlab.com/apparmor/apparmor/-/issues/310

Closes #310
MR: https://gitlab.com/apparmor/apparmor/-/merge_requests/1155
Approved-by: John Johansen <john@jjmx.net>
Merged-by: John Johansen <john@jjmx.net>

.gitlab-ci.yml

@@ -17,7 +17,7 @@ stages:
     - uname -a
 
 .install-c-build-deps: &install-c-build-deps
-  - apt-get install --no-install-recommends -y build-essential apache2-dev autoconf automake bison dejagnu flex libpam-dev libtool pkg-config python3-all-dev python3-setuptools ruby-dev swig zlib1g-dev
+  - apt-get install --no-install-recommends -y build-essential apache2-dev autoconf autoconf-archive automake bison dejagnu flex libpam-dev libtool pkg-config python3-all-dev python3-setuptools ruby-dev swig zlib1g-dev
 
 build-all:
   stage: build

libraries/libapparmor/configure.ac

@@ -92,6 +92,13 @@ if test "$ac_cv_prog_cc_c99" = "no"; then
   AC_MSG_ERROR([C99 mode is required to build libapparmor])
 fi
 
+EXTRA_CFLAGS="-Wall $(EXTRA_WARNINGS) -fPIC"
+AX_CHECK_COMPILE_FLAG([-flto-partition=none], , , [-Werror])
+AS_VAR_IF([ax_cv_check_cflags__Werror__flto_partition_none], [yes],
+	[EXTRA_CFLAGS="$EXTRA_CFLAGS -flto-partition=none"]
+	,)
+AC_SUBST([AM_CFLAGS], ["$EXTRA_CFLAGS"])
+
 AC_OUTPUT(
 Makefile
 doc/Makefile

libraries/libapparmor/src/Makefile.am

@@ -45,7 +45,6 @@ include $(COMMONDIR)/Make.rules
 BUILT_SOURCES = grammar.h scanner.h af_protos.h
 AM_LFLAGS = -v
 AM_YFLAGS = -d -p aalogparse_
-AM_CFLAGS = -Wall $(EXTRA_WARNINGS) -fPIC -flto-partition=none
 AM_CPPFLAGS = -D_GNU_SOURCE -I$(top_srcdir)/include/
 scanner.h: scanner.l
 	$(LEX) -v $<

parser/Makefile

@@ -70,7 +70,10 @@ CFLAGS = -g -pg -fprofile-arcs -ftest-coverage
 endif
 endif #CFLAGS
 
-CFLAGS	+= -flto-partition=none
+HAVE_FLTO_PARTITION_NONE:=$(shell ${CC} -E -flto-partition=none /dev/null 1>/dev/null 2>&1 && echo true)
+ifeq ($(HAVE_FLTO_PARTITION_NONE),true)
+	CFLAGS += -flto-partition=none
+endif
 
 EXTRA_CXXFLAGS = ${CFLAGS} ${CPPFLAGS} ${CXX_WARNINGS} -std=gnu++0x
 EXTRA_CFLAGS = ${EXTRA_CXXFLAGS} ${CPP_WARNINGS}