full-trace/full_trace.cpp:4:31: fatal error: llvm/IR/Constants.h: No such file or directory

[yanglee110]

Hi, I am following the README.rd to build the LLVM-Tracer project and I came across a problem when I use the make command, that is "full-trace/full_trace.cpp:4:31: fatal error: llvm/IR/Constants.h: No such file or directory". Thanks for any help!

Here is what I tried. (1) I have built the LLVM 3.4 source using cmake and 'ninja' and then set "LLVM_HOME=/home/xxx/llvm3.4" (2) I have used the cmake command to generate the Makefile correctly. such as "-- Build files have been written to: "/home/xxx/LLVM-Tracer-master/build" (3) When I use the make command in the directory "/home/xxx/LLVM-Tracer-master/build", it emit the above error: Scanning dependencies of target full_trace [ 7%] Building CXX object full-trace/CMakeFiles/full_trace.dir/full_trace.cpp.o /home/xxx/LLVM-Tracer-master/full-trace/full_trace.cpp:4:31: fatal error: llvm/IR/Constants.h: No such file or directory

include "llvm/IR/Constants.h"

[xyzsam]

I believe you are missing the LLVM dev headers? You'll need those too.

[yanglee110]

However I have built the LLVM 3.4 source code successfully and set the LLVM_HOME variable, Of course LLVM 3.4 includes headers. And then I perform the Configure step correctly, So I think the LLVM 3.4 header files are not configured in the Configure step. Any ideas? Thanks!

[xyzsam]

What platform are you building this on?

[xyzsam]

Did you manage to resolve this issue? If so, I will close this issue.

[rdevans0]

I also had this issue as well when I built LLVM from source and installed to a non-system directory. The LLVM headers are not included from $LLVM_HOME for this file. The required fix is:

--- a/full-trace/CMakeLists.txt
+++ b/full-trace/CMakeLists.txt
@@ -1,5 +1,7 @@
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")

+include_directories($ENV{LLVM_HOME}/include)
+
 file(GLOB SRC "*.cpp")
 add_library(full_trace SHARED ${SRC})
 install(TARGETS full_trace LIBRARY DESTINATION lib)

[rgly]

The LLVM headers are supposed being included by cmake-scripts/findAndSetLLVM:24, then cmake configure each subdirectories.

I tested these cmake scripts with cmake 2.8/3.6 and Linux Mint 17/18, and LLVM 3.4/3.5 installed under home directory. Maybe your cmake does not pass these header settings to subdirectory?

What is your OS and cmake version? You can get it by lsb_release -a and cmake --version

# cmake-scripts/findAndSetLLVM

# This function returns these variable
#
# LLVM_ROOT
# LLVM_LIBS
# LLVM_DEFINITIONS
# LLVM_INCLUDE_DIRS
# LLVM_LIBRARY_DIRS
FIND_LLVM(${LLVM_ROOT} ${LLVM_RECOMMEND_VERSION} NEED_LLVM_LIB ${AUTOINSTALL})
findLLVMTool(LLVM_LINK "llvm-link")
findLLVMTool(LLVM_OPT "opt")
findLLVMTool(LLVM_LLC "llc")
findLLVMTool(LLVM_COMPILER "clang")

set(LLVMC_FLAGS ${LLVM_DEFINITIONS}
    -fno-inline-functions -fno-use-cxa-atexit)
set(LLVM_OPT_FLAGS )

# Use settings from LLVM cmake module or llvm-config.
include_directories( ${LLVM_INCLUDE_DIRS} )
link_directories( ${LLVM_LIBRARY_DIRS} )
add_definitions( ${LLVM_DEFINITIONS} )

[rdevans0]

@rgly lsb and cmake output listed below:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.10
Release:    15.10
Codename:   wily

$ cmake --version
cmake version 3.2.2

$ mkdir build && cd build && cmake .. # Using TEST_CMAKE
-- The CXX compiler identification is GNU 5.2.1
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- use LLVM_ROOT : /home/$USER/inst/llvm-3.4/inst
-- find LLVM-Config : /home/$USER/inst/llvm-3.4/inst/bin/llvm-config
-- LLVM version : 3.4svn
-- LLVM_LINK found : /home/$USER/inst/llvm-3.4/inst/bin/llvm-link
-- LLVM_OPT found : /home/$USER/inst/llvm-3.4/inst/bin/opt
-- LLVM_LLC found : /home/$USER/inst/llvm-3.4/inst/bin/llc
-- LLVM_COMPILER found : /home/$USER/inst/llvm-3.4/inst/bin/clang-3.4
debug messages below
LLVM_ROOT is /home/$USER/inst/llvm-3.4/inst
REQ_LLVM_LIBRARIES is LLVMMCJIT;LLVMBitWriter;LLVMInterpreter;LLVMLinker;LLVMIRReader;LLVMX86CodeGen;LLVMX86AsmParser;LLVMX86Disassembler;LLVMJIT;LLVMAsmParser;LLVMBitReader;LLVMAsmPrinter;LLVMSelectionDAG;LLVMX86Desc;LLVMExecutionEngine;LLVMRuntimeDyld;LLVMMCParser;LLVMCodeGen;LLVMX86AsmPrinter;LLVMX86Info;LLVMObjCARCOpts;LLVMScalarOpts;LLVMX86Utils;LLVMInstCombine;LLVMTransformUtils;LLVMipa;LLVMAnalysis;LLVMTarget;LLVMCore;LLVMMC;LLVMObject;LLVMSupport;dl;tinfo;pthread;z
LLVM_COMPILER is /home/$USER/inst/llvm-3.4/inst/bin/clang-3.4
LLVMC_FLAGS is -D__STDC_LIMIT_MACROS;-D__STDC_CONSTANT_MACROS;-fno-inline-functions;-fno-use-cxa-atexit
LLVM_DEFINITIONS is -D__STDC_LIMIT_MACROS;-D__STDC_CONSTANT_MACROS
LLVM_LIBRARY_DIRS is /usr/local/lib
LLVM_INCLUDE_DIRS is /usr/local/include
-- Found Curses: /usr/lib/x86_64-linux-gnu/libcurses.so  
-- Configuring done
-- Generating done
-- Build files have been written to: /home/$USER/inst/LLVM-Tracer/build

If I then look at full-trace-CMakeFiles/full_trace.dir/flags.make

# compile CXX with /usr/bin/c++
CXX_FLAGS = -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -std=c++11 -fno-rtti -O3 -fPIC -I/usr/local/include   

CXX_DEFINES = -DLLVM_VERSION=34 -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -Dfull_trace_EXPORTS

So the includes are definitely not being passed. Is there some major difference in include behaviour between cmake 2.8/3.6 and cmake 3.2?

Note that I also have llvm 3.5 and 3.6 installed under /usr/bin/llvm-config-3.5 and /usr/bin/llvm-config-3.6. My PATH is set up to return the correct llvm-config though.

[rgly]

CMake scripts obtain header directories through find_package(). It seems that find_package() searches system directories first.

Could you please try the following patch? It forces cmake using llvm-config instead of find_package().

diff --git a/cmake-scripts/LLVMFinder/findLLVM.cmake b/cmake-scripts/LLVMFinder/
index c107cc6..5b9c02e 100644
--- a/cmake-scripts/LLVMFinder/findLLVM.cmake
+++ b/cmake-scripts/LLVMFinder/findLLVM.cmake
@@ -92,10 +92,9 @@ FUNCTION(LOAD_LLVM_SETTINGS LLVM_CONFIG_EXE NEED_LLVM_LIB_ARG
   get_filename_component(LLVM_ROOT ${LLVM_BIN_DIR} PATH)

   # try to load the CMake module of LLVM.
-  loadLLVMModule(${LLVM_ROOT} ${NEED_LLVM_LIB_ARG})

   # Check whether LLVM package is found.
-  if(NOT ${LLVM_FOUND})
+  if(NOT "${LLVM_FOUND}")
     # if CMake module of LLVM is not found, we collect infomation
     # through llvm-config.
     loadLLVMConfig(${LLVM_CONFIG_EXE} ${NEED_LLVM_LIB_ARG})