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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - cmake ENABLE_PIC forced off on Darwin/Xcodde"
href="http://llvm.org/bugs/show_bug.cgi?id=16738">16738</a>
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<th>Summary</th>
<td>cmake ENABLE_PIC forced off on Darwin/Xcodde
</td>
</tr>
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<th>Product</th>
<td>Build scripts
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>cmake
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rfoos@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>fang@csl.cornell.edu, llvmbugs@cs.uiuc.edu, rafael.espindola@gmail.com
</td>
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<th>Depends on</th>
<td>14903
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<pre>+++ This bug was initially created as a clone of <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - cmake shared build of modules/bundles incorrect on darwin"
href="show_bug.cgi?id=14903">Bug #14903</a> +++
Cmake for Xcode disables PIC.
# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
# know how to disable this, so just force ENABLE_PIC off for now.
--- autoconf ENABLE_PIC logic for DARWIN
Makefile.rules
ifeq ($(ENABLE_PIC),1)
ifeq ($(HOST_OS), $(filter $(HOST_OS), Cygwin MingW))
# Nothing. Win32 defaults to PIC and warns when given -fPIC
else
ifeq ($(HOST_OS),Darwin)
# Common symbols not allowed in dylib files
CXX.Flags += -fno-common
C.Flags += -fno-common
else
# Linux and others; pass -fPIC
CXX.Flags += -fPIC
C.Flags += -fPIC
endif
endif
else
ifeq ($(HOST_OS),Darwin)
CXX.Flags += -mdynamic-no-pic
C.Flags += -mdynamic-no-pic
endif
endif
--- cmake ENABLE_PIC logic for darwin/xcode.
cmake/modules/HandleLLVMOptions.cmake
if( ENABLE_PIC )
if( XCODE )
# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
# know how to disable this, so just force ENABLE_PIC off for now.
message(WARNING "-fPIC not supported with Xcode.")
elseif( WIN32 OR CYGWIN)
# On Windows all code is PIC. MinGW warns if -fPIC is used.
else()
add_flag_or_print_warning("-fPIC")
if( WIN32 OR CYGWIN)
# MinGW warns if -fvisibility-inlines-hidden is used.
else()
check_cxx_compiler_flag("-fvisibility-inlines-hidden"
SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG
"-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
endif()
endif()
endif()</pre>
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