Explicitly add all arch/<arch>/* files to respective _SOURCES
variables instead of using @ARCH_DIR@ substitution.

This patch fixes the broken build for ARM, PPC, and MIPS
introduced by [1] and the similar issue reported while
testing [2].

>From the Autoconf manual [3]:

  You can't put a configure substitution (e.g., '@FOO@' or
  '$(FOO)' where FOO is defined via AC_SUBST) into a _SOURCES
  variable. The reason for this is a bit hard to explain, but
  suffice to say that it simply won't work.

Here be dragons..

[1] https://lists.linaro.org/pipermail/lng-odp/2017-April/030324.html
[2] https://lists.linaro.org/pipermail/lng-odp/2017-June/031598.html
[3] 
https://www.gnu.org/software/automake/manual/html_node/Conditional-Sources.html

Signed-off-by: Brian Brooks <brian.bro...@arm.com>
---
 configure.ac                       |  3 +++
 platform/linux-generic/Makefile.am | 40 ++++++++++++++++++++++++++++++--------
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/configure.ac b/configure.ac
index 46c7bbd2..45812f66 100644
--- a/configure.ac
+++ b/configure.ac
@@ -225,6 +225,9 @@ AM_CONDITIONAL([HAVE_DOXYGEN], [test "x${DOXYGEN}" = 
"xdoxygen"])
 AM_CONDITIONAL([user_guide], [test "x${user_guides}" = "xyes" ])
 AM_CONDITIONAL([HAVE_MSCGEN], [test "x${MSCGEN}" = "xmscgen"])
 AM_CONDITIONAL([helper_linux], [test x$helper_linux = xyes ])
+AM_CONDITIONAL([ARCH_IS_ARM], [test "x${ARCH_DIR}" = "xarm"])
+AM_CONDITIONAL([ARCH_IS_MIPS64], [test "x${ARCH_DIR}" = "xmips64"])
+AM_CONDITIONAL([ARCH_IS_POWERPC], [test "x${ARCH_DIR}" = "xpowerpc"])
 AM_CONDITIONAL([ARCH_IS_X86], [test "x${ARCH_DIR}" = "xx86"])
 
 ##########################################################################
diff --git a/platform/linux-generic/Makefile.am 
b/platform/linux-generic/Makefile.am
index 8dcdebd2..385c5304 100644
--- a/platform/linux-generic/Makefile.am
+++ b/platform/linux-generic/Makefile.am
@@ -63,8 +63,20 @@ odpapiinclude_HEADERS = \
                  $(srcdir)/include/odp/api/time.h \
                  $(srcdir)/include/odp/api/timer.h \
                  $(srcdir)/include/odp/api/traffic_mngr.h \
-                 $(srcdir)/include/odp/api/version.h \
-                 $(srcdir)/arch/@ARCH_DIR@/odp/api/cpu_arch.h
+                 $(srcdir)/include/odp/api/version.h
+
+if ARCH_IS_ARM
+odpapiinclude_HEADERS += $(srcdir)/arch/arm/odp/api/cpu_arch.h
+endif
+if ARCH_IS_MIPS64
+odpapiinclude_HEADERS += $(srcdir)/arch/mips64/odp/api/cpu_arch.h
+endif
+if ARCH_IS_POWERPC
+odpapiinclude_HEADERS += $(srcdir)/arch/powerpc/odp/api/cpu_arch.h
+endif
+if ARCH_IS_X86
+odpapiinclude_HEADERS += $(srcdir)/arch/x86/odp/api/cpu_arch.h
+endif
 
 odpapiplatincludedir= $(includedir)/odp/api/plat
 odpapiplatinclude_HEADERS = \
@@ -217,20 +229,32 @@ __LIB__libodp_linux_la_SOURCES = \
                           odp_timer_wheel.c \
                           odp_traffic_mngr.c \
                           odp_version.c \
-                          odp_weak.c \
-                          arch/@ARCH_DIR@/odp_cpu_arch.c \
-                          arch/@ARCH_DIR@/odp_sysinfo_parse.c
-
-__LIB__libodp_linux_la_LIBADD = $(ATOMIC_LIBS)
+                          odp_weak.c
 
+if ARCH_IS_ARM
+__LIB__libodp_linux_la_SOURCES += arch/arm/odp_cpu_arch.c \
+                                 arch/arm/odp_sysinfo_parse.c
+endif
+if ARCH_IS_MIPS64
+__LIB__libodp_linux_la_SOURCES += arch/mips64/odp_cpu_arch.c \
+                                 arch/mips64/odp_sysinfo_parse.c
+endif
+if ARCH_IS_POWERPC
+__LIB__libodp_linux_la_SOURCES += arch/powerpc/odp_cpu_arch.c \
+                                 arch/powerpc/odp_sysinfo_parse.c
+endif
 if ARCH_IS_X86
-__LIB__libodp_linux_la_SOURCES += arch/@ARCH_DIR@/cpu_flags.c
+__LIB__libodp_linux_la_SOURCES += arch/x86/odp_cpu_arch.c \
+                                 arch/x86/odp_sysinfo_parse.c \
+                                 arch/x86/cpu_flags.c
 endif
 
 if HAVE_PCAP
 __LIB__libodp_linux_la_SOURCES += pktio/pcap.c
 endif
 
+__LIB__libodp_linux_la_LIBADD = $(ATOMIC_LIBS)
+
 # Create symlink for ABI header files. Application does not need to use the 
arch
 # specific include path for installed files.
 install-data-hook:
-- 
2.13.1

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