X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/44ff0af68cbb67b060f89c3d7142af4f02b28f2f..5d9403fde4e0d89313121fcd5fa4cfc6c4ddfc4e:/LUFA/Build/lufa.doxygen.in

diff --git a/LUFA/Build/lufa.doxygen.in b/LUFA/Build/lufa.doxygen.in
index 2d8c28db3..7f7334311 100644
--- a/LUFA/Build/lufa.doxygen.in
+++ b/LUFA/Build/lufa.doxygen.in
@@ -45,9 +45,11 @@ LUFA_BUILD_PROVIDED_MACROS +=
 #
 # -----------------------------------------------------------------------------
 
-ERROR_IF_UNSET   = $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
-ERROR_IF_EMPTY   = $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
-ERROR_IF_NONBOOL = $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
+SHELL = /bin/sh
+
+ERROR_IF_UNSET   ?= $(if $(filter undefined, $(origin $(strip $(1)))), $(error Makefile $(strip $(1)) value not set))
+ERROR_IF_EMPTY   ?= $(if $(strip $($(strip $(1)))), , $(error Makefile $(strip $(1)) option cannot be blank))
+ERROR_IF_NONBOOL ?= $(if $(filter Y N, $($(strip $(1)))), , $(error Makefile $(strip $(1)) option must be Y or N))
 
 # Default values of optionally user-supplied variables
 DOXYGEN_CONF            ?= Doxygen.conf
@@ -64,11 +66,11 @@ $(call ERROR_IF_NONBOOL, DOXYGEN_FAIL_ON_WARNING)
 MSG_DOXYGEN_CMD         := ' [DOXYGEN] :'
 
 # Determine Doxygen invocation command
-BASE_DOXYGEN_CMD = ( cat $(DOXYGEN_CONF) $(DOXYGEN_OVERRIDE_PARAMS:%=; echo "%") ) | doxygen -
+BASE_DOXYGEN_CMD := ( cat $(DOXYGEN_CONF) $(DOXYGEN_OVERRIDE_PARAMS:%=; echo "%") ) | doxygen -
 ifeq ($(DOXYGEN_FAIL_ON_WARNING), Y)
-   DOXYGEN_CMD = if ( $(BASE_DOXYGEN_CMD) 2>&1 | grep -v "warning: ignoring unsupported tag" ;); then exit 1; fi;
+   DOXYGEN_CMD := if ( $(BASE_DOXYGEN_CMD) 2>&1 | grep -v "warning: ignoring unsupported tag" ;); then exit 1; fi;
 else
-   DOXYGEN_CMD = $(BASE_DOXYGEN_CMD)
+   DOXYGEN_CMD := $(BASE_DOXYGEN_CMD)
 endif
 
 doxygen: