[LLVMbugs] [Bug 14539] New: llvm-config only provide minimum set of flags needed to compile code that interfaces with LLVM

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14539

             Bug #: 14539
           Summary: llvm-config only provide minimum set of flags needed
                    to compile code that interfaces with LLVM
           Product: new-bugs
           Version: 3.2
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: howarth at nitro.med.uc.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Currently, llvm-config returns compiler flags with --cflags, --cxxflags and
--cpp-flags that are unnecessary to compile code that interfaces with LLVM, In
particular, dragonegg in the 3.2 release can no longer be compiled with FSF gcc
if the installed LLVM was built with clang because the -Wcovered-switch-default
flag is provided by llvm-config. The following patch has to be used to avoid
this problem in llvm/dragonegg 3.2...

--- dragonegg-3.2/Makefile.orig 2012-12-07 12:50:30.000000000 -0500
+++ dragonegg-3.2/Makefile      2012-12-07 12:51:21.000000000 -0500
@@ -42,8 +42,8 @@
 else
 COMMON_FLAGS+=-fvisibility=hidden
 endif
-CFLAGS+=$(COMMON_FLAGS) $(shell $(LLVM_CONFIG) --cflags)
-CXXFLAGS+=$(COMMON_FLAGS) $(shell $(LLVM_CONFIG) --cxxflags)
+CFLAGS+=$(COMMON_FLAGS) $(shell $(LLVM_CONFIG) --cflags | sed -e
's/-Wcovered-switch-default//')
+CXXFLAGS+=$(COMMON_FLAGS) $(shell $(LLVM_CONFIG) --cxxflags | sed -e
's/-Wcovered-switch-default//')

 ifeq ($(shell uname),Darwin)
 LOADABLE_MODULE_OPTIONS=-bundle -undefined dynamic_lookup
@@ -76,7 +76,7 @@

 ALL_OBJECTS=$(PLUGIN_OBJECTS) $(TARGET_OBJECT) $(TARGET_UTIL_OBJECTS)

-CPP_OPTIONS+=$(CPPFLAGS) $(shell $(LLVM_CONFIG) --cppflags) \
+CPP_OPTIONS+=$(CPPFLAGS) $(shell $(LLVM_CONFIG) --cppflags | sed -e
's/-Wcovered-switch-default//') \
             -fno-rtti \
             -MD -MP \
             -DIN_GCC -DLLVM_VERSION=\"$(LLVM_VERSION)\" \

so that FSF gcc 4.7.2 can be used to build dragonegg 3.2 against an llvm 3.2
built with clang. Such a patch should not be necessary.

-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.