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authorGravatar Hector Martin2009-08-24 17:59:35 +0200
committerGravatar Hector Martin2009-08-24 17:59:35 +0200
commitec63619f611c7246247485ae3d27818aa2aa1dbd (patch)
tree2e9f404deb24c15dbe44bc87f28065b6008ee099 /Modules/CheckConstantExists.cmake
parent0a1fe2abddbd73ed00a93afd8dcaf38f5210c0fc (diff)
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ZLP flag is an enum, move check into CMake.
Now prints the big fat warning at configure time
Diffstat (limited to 'Modules/CheckConstantExists.cmake')
-rw-r--r--Modules/CheckConstantExists.cmake38
1 files changed, 38 insertions, 0 deletions
diff --git a/Modules/CheckConstantExists.cmake b/Modules/CheckConstantExists.cmake
new file mode 100644
index 0000000..3d6d97e
--- /dev/null
+++ b/Modules/CheckConstantExists.cmake
@@ -0,0 +1,38 @@
+# - Check if the given constant exists (as an enum, define, or whatever)
+# CHECK_CONSTANT_EXISTS (CONSTANT HEADER VARIABLE)
+#
+# CONSTANT - the name of the constant you are interested in
+# HEADER - the header(s) where the prototype should be declared
+# VARIABLE - variable to store the result
+#
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+# CMAKE_REQUIRED_FLAGS = string of compile command line flags
+# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+# CMAKE_REQUIRED_INCLUDES = list of include directories
+#
+# Example: CHECK_CONSTANT_EXISTS(O_NOFOLLOW fcntl.h HAVE_O_NOFOLLOW)
+
+
+INCLUDE(CheckCSourceCompiles)
+
+MACRO (CHECK_CONSTANT_EXISTS _CONSTANT _HEADER _RESULT)
+ SET(_INCLUDE_FILES)
+ FOREACH (it ${_HEADER})
+ SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
+ ENDFOREACH (it)
+
+ SET(_CHECK_CONSTANT_SOURCE_CODE "
+${_INCLUDE_FILES}
+void cmakeRequireConstant(int dummy,...){(void)dummy;}
+int main()
+{
+ cmakeRequireConstant(0,${_CONSTANT});
+ return 0;
+}
+")
+ CHECK_C_SOURCE_COMPILES("${_CHECK_CONSTANT_SOURCE_CODE}" ${_RESULT})
+
+ENDMACRO (CHECK_CONSTANT_EXISTS)
+