Commit 7eb8d903 authored by Peter Collingbourne's avatar Peter Collingbourne

Provide dependency file flags to generator

Causes compiler modules (currently only GNU) to set a
CMAKE_DEPFILE_FLAGS_${lang} variable, which communicates to
the generator the flags required to cause the compiler to create
dependency files.
parent 4468edf1
......@@ -24,6 +24,15 @@ macro(__compiler_gnu lang)
set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
# Older versions of gcc (< 4.5) contain a bug causing them to report a missing
# header file as a warning if depfiles are enabled, causing check_header_file
# tests to always succeed. Work around this by disabling dependency tracking
# in try_compile mode.
GET_PROPERTY(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
set(CMAKE_DEPFILE_FLAGS_${lang} "-MMD -MF <DEPFILE>")
endif()
# Initial configuration flags.
set(CMAKE_${lang}_FLAGS_INIT "")
set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-g")
......
......@@ -40,6 +40,8 @@ if("${CMAKE_GENERATOR}" MATCHES "Make")
endif()
list(APPEND _cmake_options "-DTEST_LINK_DEPENDS=${TEST_LINK_DEPENDS}")
list(APPEND _cmake_options "-DCMAKE_FORCE_DEPFILES=1")
file(MAKE_DIRECTORY ${BuildDepends_BINARY_DIR}/Project)
message("Creating Project/foo.cxx")
write_file(${BuildDepends_BINARY_DIR}/Project/foo.cxx
......
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