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llvm-config: Add --has-rtti option

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Summary:
This prints NO if LLVM was built with -fno-rtti or an equivalent flag
and YES otherwise.  The reasons to add -has-rtti rather than adding -fno-rtti
to --cxxflags are:

1. Building LLVM with -fno-rtti does not always mean that client
applications need this flag.

2. Some compilers have a different flag for disabling rtti, and the
compiler being used to build LLVM may not be the compiler being used to
build the application.

Reviewers: echristo, chandlerc, beanz

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11849

llvm-svn: 252075
This commit is contained in:
Tom Stellard 2015-11-04 20:57:43 +00:00
parent d1f5a2789e
commit 9c18b9c83d
5 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
cmake/modules/AddLLVM.cmake
View File

@ -26,7 +26,9 @@ function(llvm_update_compile_flags name)
# LLVM_REQUIRES_RTTI is an internal flag that individual
# targets can use to force RTTI
set(LLVM_CONFIG_HAS_RTTI YES CACHE INTERNAL "")
if(NOT (LLVM_REQUIRES_RTTI OR LLVM_ENABLE_RTTI))
set(LLVM_CONFIG_HAS_RTTI NO CACHE INTERNAL "")
list(APPEND LLVM_COMPILE_DEFINITIONS GTEST_HAS_RTTI=0)
if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
list(APPEND LLVM_COMPILE_FLAGS "-fno-rtti")

1
tools/llvm-config/BuildVariables.inc.in
View File

@ -27,3 +27,4 @@
#define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
#define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
#define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
#define LLVM_HAS_RTTI "@LLVM_HAS_RTTI@"

1
tools/llvm-config/CMakeLists.txt
View File

@ -25,6 +25,7 @@ set(LLVM_CPPFLAGS "${CMAKE_CPP_FLAGS} ${CMAKE_CPP_FLAGS_${uppercase_CMAKE_BUILD_
set(LLVM_CFLAGS "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${LLVM_DEFINITIONS}")
set(LLVM_CXXFLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${COMPILE_FLAGS} ${LLVM_DEFINITIONS}")
set(LLVM_BUILD_SYSTEM cmake)
set(LLVM_HAS_RTTI ${LLVM_CONFIG_HAS_RTTI})
# Use the C++ link flags, since they should be a superset of C link flags.
set(LLVM_LDFLAGS "${CMAKE_CXX_LINK_FLAGS}")

8
tools/llvm-config/Makefile
View File

@ -38,6 +38,12 @@ else
LLVM_SYSTEM_LIBS := $(LIBS)
endif
ifneq ($(REQUIRES_RTTI), 1)
LLVM_HAS_RTTI := NO
else
LLVM_HAS_RTTI := YES
endif
# This is blank for now. We need to be careful about adding stuff here:
# LDFLAGS tend not to be portable, and we don't currently require the
# user to use libtool when linking against LLVM.
@ -67,6 +73,8 @@ $(ObjDir)/BuildVariables.inc: $(BUILDVARIABLES_SRCPATH) Makefile $(ObjDir)/.dir
>> temp.sed
$(Verb) $(ECHO) 's/@LLVM_BUILD_SYSTEM@/autoconf/' \
>> temp.sed
$(Verb) $(ECHO) 's/@LLVM_HAS_RTTI@/$(LLVM_HAS_RTTI)/' \
>> temp.sed
$(Verb) $(SED) -f temp.sed < $< > $@
$(Verb) $(RM) temp.sed

3
tools/llvm-config/llvm-config.cpp
View File

@ -158,6 +158,7 @@ Options:\n\
--build-mode Print build mode of LLVM tree (e.g. Debug or Release).\n\
--assertion-mode Print assertion mode of LLVM tree (ON or OFF).\n\
--build-system Print the build system used to build LLVM (autoconf or cmake).\n\
--has-rtti Print whether or not LLVM was built with rtti (YES or NO).\n\
Typical components:\n\
all All LLVM libraries (default).\n\
engine Either a native JIT or a bitcode interpreter.\n";
@ -326,6 +327,8 @@ int main(int argc, char **argv) {
#endif
} else if (Arg == "--build-system") {
OS << LLVM_BUILD_SYSTEM << '\n';
} else if (Arg == "--has-rtti") {
OS << LLVM_HAS_RTTI << '\n';
} else if (Arg == "--obj-root") {
OS << ActivePrefix << '\n';
} else if (Arg == "--src-root") {