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-rw-r--r--Modules/Compiler/GNU.cmake9
-rw-r--r--Tests/BuildDepends/CMakeLists.txt2
2 files changed, 11 insertions, 0 deletions
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index 8d6f5df..bdcaf9d 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -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_${lang}_FLAGS_DEBUG_INIT "-g")
diff --git a/Tests/BuildDepends/CMakeLists.txt b/Tests/BuildDepends/CMakeLists.txt
index 31392b5..aa32d67 100644
--- a/Tests/BuildDepends/CMakeLists.txt
+++ b/Tests/BuildDepends/CMakeLists.txt
@@ -40,6 +40,8 @@ if("${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