[LLVMbugs] [Bug 8220] New: llvm-config prints unnecessary cflags

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8220

           Summary: llvm-config prints unnecessary cflags
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-config
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nobled at dreamwidth.org
                CC: llvmbugs at cs.uiuc.edu


llvm-config --cflags always prints exactly what LLVM itself was built with,
instead of printing just what other projects need to compile against it. This
can cause problems when trying to compile with a different -O level:

http://lists.freedesktop.org/archives/mesa-dev/2010-September/003216.html

With a SVN r114337 Release+Asserts build, llvm-config gives this:

my $CPPFLAGS            = q{ -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS};
my $CFLAGS              = q{ -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O3 -fomit-frame-pointer -fPIC};
my $CXXFLAGS            = q{ -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS
-D__STDC_CONSTANT_MACROS -O3 -fomit-frame-pointer -fno-exceptions -fno-rtti
-fPIC -Woverloaded-virtual -Wcast-qual};
my $LDFLAGS             = q{};

How many of these are actually needed to include and link against LLVM?

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