Undocumented build dependency: PCRE about duckling

[camerondavison]

I ran brew config and noticed that it said

Xcode: 8.3.2
CLT: N/A

So I installed CLT by running

xcode-select --install

Then I upgraded gcc from 5.3.0 to 7.1.0 using

brew upgrade gcc

and it I was then able to compile everything

[niteria]

Thanks for the report. I'm adding a note in the README.

[almostimplemented]

Thanks -- and sorry: I hadn't seen #6 before raising the issue.

[camerondavison]

I am on mac 10.12.3 and ran brew install pcre and have pcre-8.40 installed, but it does not seem to have worked for me. Anything else that needs to be installed?

[niteria]

Hmm, interesting.

What does brew info pcre say?
What are the contents of /usr/local/Cellar/pcre/?
What does gcc -lpcre say?
Is the error message the same as above? If not, can you paste it?

[schultz-is]

i see the same issue. installing pcre from homebrew does install the development headers, but maybe not in the location the compiler is looking for

[10:36:52] schultz @ crux : ~/Repositories/duckling
% brew info pcre
pcre: stable 8.40 (bottled), HEAD
Perl compatible regular expressions library
http://www.pcre.org/
/usr/local/Cellar/pcre/8.40 (204 files, 5.4MB) *
  Built from source on 2017-05-09 at 10:34:10
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/pcre.rb

[10:36:57] schultz @ crux : ~/Repositories/duckling
% ls /usr/local/Cellar/pcre
8.40

[10:37:03] schultz @ crux : ~/Repositories/duckling
% ls /usr/local/Cellar/pcre/8.40/include
pcre.h  pcre_scanner.h  pcre_stringpiece.h  pcrecpp.h  pcrecpparg.h  pcreposix.h

this is on macOS Sierra 10.12.4

[niteria]

@schultz-texas

What does gcc -lpcre return?
How about gcc --version?

[schultz-is]

[10:55:27] schultz @ crux : ~/Repositories/duckling
% gcc -lpcre
Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[10:55:30] schultz @ crux : ~/Repositories/duckling
% gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

i get the same result with actual gcc:

[10:56:24] schultz @ crux : ~/Repositories/duckling
% /usr/local/bin/gcc-7 -lpcre
Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

[niteria]

That does look reasonable, are you compiling with stack?
Can you paste the compile error you get?

[schultz-is]

figured it out. the default pcre install doesn't seem to include development headers. submitted a pull request (#10) that includes updated documentation to pull source along with pcre homebrew package

[camerondavison]

I did

brew uninstall --ignore-dependencies pcre
HOMEBREW_BUILD_FROM_SOURCE=1 brew install pcre

then ran

stack build

and get

regex-pcre-0.94.4: configure
transformers-compat-0.5.1.4: download
timezone-series-0.1.6.1: download
haskell-src-exts-1.18.2: download
regex-pcre-0.94.4: build
timezone-series-0.1.6.1: configure
timezone-series-0.1.6.1: build
transformers-compat-0.5.1.4: configure
transformers-compat-0.5.1.4: build
haskell-src-exts-1.18.2: configure
haskell-src-exts-1.18.2: build
timezone-series-0.1.6.1: copy/register
transformers-compat-0.5.1.4: copy/register
haskell-src-exts-1.18.2: copy/register
Progress: 4/28
--  While building package regex-pcre-0.94.4 using:
      /Users/cameron/.stack/setup-exe-cache/x86_64-osx/Cabal-simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 --builddir=.stack-work/dist/x86_64-osx/Cabal-1.24.2.0 build --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
    Logs have been written to: /Users/cameron/Code/duckling/.stack-work/logs/regex-pcre-0.94.4.log

    Configuring regex-pcre-0.94.4...
    Building regex-pcre-0.94.4...
    Preprocessing library regex-pcre-0.94.4...
    Wrap.hsc:148:10: fatal error: 'pcre.h' file not found    #include <pcre.h>
             ^
    1 error generated.
    compiling .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Text/Regex/PCRE/Wrap_hsc_make.c failed (exit code 1)
    command was: /usr/bin/gcc -c .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Text/Regex/PCRE/Wrap_hsc_make.c -o .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/Text/Regex/PCRE/Wrap_hsc_make.o -m64 -fno-stack-protector -m64 -fno-stack-protector -m64 -D__GLASGOW_HASKELL__=800 -Ddarwin_BUILD_OS=1 -Dx86_64_BUILD_ARCH=1 -Ddarwin_HOST_OS=1 -Dx86_64_HOST_ARCH=1 -DHAVE_PCRE_H -DSPLIT_BASE=1 -I.stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/autogen -include .stack-work/dist/x86_64-osx/Cabal-1.24.2.0/build/autogen/cabal_macros.h -I/Users/cameron/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/bytestring-0.10.8.1/include -I/Users/cameron/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/base-4.9.1.0/include -I/Users/cameron/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/integer-gmp-1.0.0.1/include -I/Users/cameron/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/include -I/Users/cameron/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/include/

$ brew info pcre
pcre: stable 8.40 (bottled), HEAD
Perl compatible regular expressions library
http://www.pcre.org/
/usr/local/Cellar/pcre/8.40 (204 files, 5.3MB) *
  Built from source on 2017-05-09 at 14:25:15
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/pcre.rb

/usr/local/Cellar/pcre/
└── 8.40
    ├── AUTHORS
    ├── COPYING
    ├── ChangeLog
    ├── INSTALL_RECEIPT.json
    ├── LICENCE
    ├── NEWS
    ├── README
    ├── bin
    │   ├── pcre-config
    │   ├── pcregrep
    │   └── pcretest
    ├── include
    │   ├── pcre.h
    │   ├── pcre_scanner.h
    │   ├── pcre_stringpiece.h
    │   ├── pcrecpp.h
    │   ├── pcrecpparg.h
    │   └── pcreposix.h
    ├── lib
    │   ├── libpcre.1.dylib
    │   ├── libpcre.a
    │   ├── libpcre.dylib -> libpcre.1.dylib
    │   ├── libpcre16.0.dylib
    │   ├── libpcre16.a
    │   ├── libpcre16.dylib -> libpcre16.0.dylib
    │   ├── libpcre32.0.dylib
    │   ├── libpcre32.a
    │   ├── libpcre32.dylib -> libpcre32.0.dylib
    │   ├── libpcrecpp.0.dylib
    │   ├── libpcrecpp.a
    │   ├── libpcrecpp.dylib -> libpcrecpp.0.dylib
    │   ├── libpcreposix.0.dylib
    │   ├── libpcreposix.a
    │   ├── libpcreposix.dylib -> libpcreposix.0.dylib
    │   └── pkgconfig
    │       ├── libpcre.pc
    │       ├── libpcre16.pc
    │       ├── libpcre32.pc
    │       ├── libpcrecpp.pc
    │       └── libpcreposix.pc

... clipped out share/docs/man

$ gcc -lpcre
Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[schultz-is]

well dang. i'll run back through my terminal history and see if there is some other intermediate step or path that caused it to work for me

[niteria]

Ok, I checked on my system and gcc finds pcre.h in /usr/local/include/.
I've checked that it's brew that installs it there.

I'd suggest running brew doctor and fix the issues that it detects.
I expect it to find the issue described here: http://stackoverflow.com/questions/14527521/brew-doctor-says-warning-usr-local-include-isnt-writable

It may be that you'll have to reinstall pcre after you make /usr/local/include writable.

[schultz-is]

yeah, it's strange. seems to work fine on other machines for me. i can only imagine the reinstall of pcre i did fixed the issue for me. went ahead and closed out the pull request i opened since it now seems unrelated

[mickume]

The above worked for me as well, compiling is now OK after I installed gcc from brew.