Compile finds PCRE but also doesn't find it ?

[R3belWithoutAPause]

Hi,

I'm currently trying to compile Hyperscan 4.70 on Slackware64-14.2 and i'm noticing this strange contradiction:

-- Checking for module 'libpcre=8.41'
-- Found libpcre, version 8.41
-- PCRE version 8.41
-- PCRE 8.41 not found, not building hscollider
-- Configuring done
-- Generating done

This seems contradictory to me and is preventing me from building the hs-collider module.

GCC Version 5.5.0
G++ Version 5.5.0

Please let me know if you need any other information .

[xiangwang1]

Thanks for the report!

Looks like there is an issue with hscollider CMake file:

hyperscan/tools/hscollider/CMakeLists.txt

Line 7 in 7dfaca6

if (NOT CORRECT_PCRE_VERSION)

Will changing CORRECT_PCRE_VERSION to PCRE_CHECKED fix your issue?

[R3belWithoutAPause]

Hi @xiangwang1

I tried your suggested fix but it didn't fix the issue. It still shows the previous output:

Found PkgConfig: /usr/bin/pkg-config (found version "0.29.2")
-- Checking for module 'libpcre=8.41'
-- Found libpcre, version 8.41
-- PCRE version 8.41
-- PCRE 8.41 not found, not building hscollider
-- Configuring done
-- Generating done

I may have found a workaround and that is to copy the PCRE-8.41 source folder to the root of the hyperscan folder so that the folder hierarchy looks like this:

This resulted in:

-- Looking for malloc_info
-- Looking for malloc_info - found
-- Looking for shmget
-- Looking for shmget - found
-- Performing Test CORRECT_PCRE_VERSION
-- Performing Test CORRECT_PCRE_VERSION - Success
-- PCRE version 8.41 - building from source.
-- Found BZip2: /usr/lib64/libbz2.so (found version "1.0.6")

And i was then able to build hscollider. I must point out that i also reverted your suggested fix.

[xiangwang1]

Yes, it works by placing PCRE under Hyperscan top directory.

Could you try adding set (CORRECT_PCRE_VERSION TRUE) after below line without moving PCRE files?

hyperscan/cmake/pcre.cmake

Line 56 in 7dfaca6

if (PCRE_FOUND)

[R3belWithoutAPause]

Hi,

Using your previous 2 edits and without the pcre source, it still fails to build hscollder:

-- Checking for module 'libpcre=8.41'
-- Found libpcre, version 8.41
-- PCRE version 8.41
-- PCRE 8.41 not found, not building hscollider
-- Configuring done
-- Generating done

[xiangwang1]

Sorry, please ignore my first comment and just change according to my second comment about adding set (CORRECT_PCRE_VERSION TRUE).

[R3belWithoutAPause]

Progress !!

-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.2")
-- Checking for module 'libpcre=8.41'
-- Found libpcre, version 8.41
-- PCRE version 8.41
-- Performing Test BACKTRACE_LIBC

However, a new error appears now:

CMake Warning (dev) at tools/hscollider/CMakeLists.txt:69 (add_dependencies):
Policy CMP0046 is not set: Error on non-existent dependency in
add_dependencies. Run "cmake --help-policy CMP0046" for policy details.
Use the cmake_policy command to set the policy and suppress this warning.

Running cmake --help-policy CMP0046 shows the following:

Error on non-existent dependency in add_dependencies.

CMake 2.8.12 and lower silently ignored non-existent dependencies
listed in the add_dependencies() command.

The OLD behavior for this policy is to silently ignore non-existent
dependencies. The NEW behavior for this policy is to report an error
if non-existent dependencies are listed in the add_dependencies()
command.

This policy was introduced in CMake version 3.0.
CMake version 3.10.3 warns when the policy is not set and uses
OLD behavior. Use the cmake_policy command to set it to OLD or
NEW explicitly.

I guess this error is because im currently using cmake 3.10.3

[xiangwang1]

Yes, this is a warning for newer version of CMake but it wouldn't affect the compile results. You can suppress it by deleting this redundant line at:

hyperscan/tools/hscollider/CMakeLists.txt

Line 69 in 7dfaca6

add_dependencies(hscollider pcre)

We'll have a commit to fix these issues in our next release.

[R3belWithoutAPause]

Hi,

Indeed it does compile fine now. Just wanted to say thank you for helping me fix this problem :)

I will close this issue now

[jobish]

Hi,
I have the same issue on Centos7 and
set the flag on cMakeLists.txt (set (CORRECT_PCRE_VERSION TRUE) ) but following error occurred on Making time

[ 96%] Building CXX object tools/hscollider/CMakeFiles/hscollider.dir/GroundTruth.cpp.o
/usr/local/include/hyperscan/tools/hscollider/GroundTruth.cpp: In member function ‘std::unique_ptr GroundTruth::compile(unsigned int, bool)’:
/usr/local/include/hyperscan/tools/hscollider/GroundTruth.cpp:282:14: error: ‘PCRE_NO_AUTO_POSSESS’ was not declared in this scope
flags |= PCRE_NO_AUTO_POSSESS;
^
gmake[2]: *** [tools/hscollider/CMakeFiles/hscollider.dir/GroundTruth.cpp.o] Error 1
gmake[1]: *** [tools/hscollider/CMakeFiles/hscollider.dir/all] Error 2
gmake: *** [all] Error 2

[xiangwang1]

Hi,

What PCRE version and package have you installed? Could you show your full cmake output?