luajit: fix build issues, obey more vars

Rework how variables are passed in to ensure that more of our flag vars are
obeyed, make it obey more of our target path vars, and use fewer of its
hardcoded flags. Also add verbosity to the compile output for debugging.

Without this, errors were seen for us:

    | In file included from .../lib/gcc/i686-pc-linux-gnu/5.2.0/include-fixed/64/sgxx-glibc/syslimits.h:7:0,
    |                  from .../lib/gcc/i686-pc-linux-gnu/5.2.0/include-fixed/64/sgxx-glibc/limits.h:34,
    |                  from luaconf.h:12,
    |                  from lua.h:16,
    |                  from lj_arch.h:9:
    | .../lib/gcc/i686-pc-linux-gnu/5.2.0/include-fixed/64/sgxx-glibc/limits.h:168:61: fatal error: limits.h: No such file or directory
    | compilation terminated.
    | Makefile:233: *** Unsupported target architecture.  Stop.
    | make[1]: Leaving directory '.../luajit/2.0.4-r0/LuaJIT-2.0.4/src'

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit 852cd67b91)
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-devtools/luajit/luajit_2.0.4.bb

@@ -15,11 +15,6 @@ inherit pkgconfig binconfig
 
 BBCLASSEXTEND = "native"
 
-do_configure_prepend() {
-    sed -i 's:PREFIX= /usr/local:PREFIX= ${prefix}:g' ${S}/Makefile
-    sed -i 's:MULTILIB= lib:MULTILIB= ${baselib}:g' ${S}/Makefile
-}
-
 # http://luajit.org/install.html#cross
 # Host luajit needs to be compiled with the same pointer size
 # If you want to cross-compile to any 32 bit target on an x64 OS,
@@ -30,20 +25,52 @@ BUILD_CC_ARCH_append_powerpc = ' -m32'
 BUILD_CC_ARCH_append_x86 = ' -m32'
 BUILD_CC_ARCH_append_arm = ' -m32'
 
-EXTRA_OEMAKE_append_class-target = '\
-    CROSS=${HOST_PREFIX} \
-    HOST_CC="${BUILD_CC} ${BUILD_CC_ARCH}" \
-    TARGET_CFLAGS="${TOOLCHAIN_OPTIONS} ${TARGET_CC_ARCH}" \
-    TARGET_LDFLAGS="${TOOLCHAIN_OPTIONS}" \
-    TARGET_SHLDFLAGS="${TOOLCHAIN_OPTIONS}" \
-'
+# The lua makefiles expect the TARGET_SYS to be from uname -s
+# Values: Windows, Linux, Darwin, iOS, SunOS, PS3, GNU/kFreeBSD
+LUA_TARGET_OS = "Unknown"
+LUA_TARGET_OS_darwin = "Darwin"
+LUA_TARGET_OS_linux = "Linux"
+LUA_TARGET_OS_linux-gnueabi = "Linux"
+LUA_TARGET_OS_mingw32 = "Windows"
+
+# We don't want the lua buildsystem's compiler optimizations, or its
+# stripping, and we don't want it to pick up CFLAGS or LDFLAGS, as those apply
+# to both host and target compiles
+EXTRA_OEMAKE = "\
+    Q= E='@:' \
+    \
+    CCOPT= CCOPT_x86= CFLAGS= LDFLAGS= TARGET_STRIP='@:' \
+    \
+    'TARGET_SYS=${LUA_TARGET_OS}' \
+    \
+    'CC=${CC}' \
+    'TARGET_AR=${AR} rcus' \
+    'TARGET_CFLAGS=${CFLAGS}' \
+    'TARGET_LDFLAGS=${LDFLAGS}' \
+    'TARGET_SHLDFLAGS=${LDFLAGS}' \
+    'HOST_CC=${BUILD_CC}' \
+    'HOST_CFLAGS=${BUILD_CFLAGS}' \
+    'HOST_LDFLAGS=${BUILD_LDFLAGS}' \
+    \
+    'PREFIX=${prefix}' \
+    'MULTILIB=${baselib}' \
+"
 
 do_compile () {
     oe_runmake
 }
 
+# There's INSTALL_LIB and INSTALL_SHARE also, but the lua binary hardcodes the
+# '/share' and '/' + LUA_MULTILIB paths, so we don't want to break those
+# expectations.
+EXTRA_OEMAKEINST = "\
+    'DESTDIR=${D}' \
+    'INSTALL_BIN=${D}${bindir}' \
+    'INSTALL_INC=${D}${includedir}/luajit-$(MAJVER).$(MINVER)' \
+    'INSTALL_MAN=${D}${mandir}/man1' \
+"
 do_install () {
-    oe_runmake 'DESTDIR=${D}' install
+    oe_runmake ${EXTRA_OEMAKEINST} install
     rmdir ${D}${datadir}/lua/5.* \
           ${D}${datadir}/lua \
           ${D}${libdir}/lua/5.* \
@@ -52,6 +79,9 @@ do_install () {
 
 PACKAGES += 'luajit-common'
 
+# See the comment for EXTRA_OEMAKEINST. This is needed to ensure the hardcoded
+# paths are packaged regardless of what the libdir and datadir paths are.
+FILES_${PN} += "${prefix}/${baselib} ${prefix}/share"
 FILES_${PN} += "${libdir}/libluajit-5.1.so.2 \
     ${libdir}/libluajit-5.1.so.${PV} \
 "