Library works with Clang but not with GCC

Question

Why does this library work perfectly with Apple LLVM 5.0 (clang-500.2.79), while merely including the header file causes an error with GCC 4.9?

Minimal source file that produces the error:

#include <divsufsort.h>

int main() {  
  return 0;
}

The error I get with GCC 4.9:

In file included from main.cpp:1:0:
/usr/local/include/divsufsort.h:74:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:86:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:94:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:108:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:123:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:137:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:152:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API
 ^
/usr/local/include/divsufsort.h:169:1: error: expected constructor, destructor, or type conversion before '(' token
 DIVSUFSORT_API

That's not a library; it is a header. There's a difference. A header is source code; a library is object code. (Yes, Boost confuses things by having 'header-only libraries'.) Are you compiling it as C++ or as C? Is it intended to be compiled as C++ or as C? Please — choose the correct language and do not dual tag. — Jonathan Leffler, Jan 02 '14 at 05:27
@JonathanLeffler Many well-eritten C headers are C++-compatible, that's what `#ifdef __cplusplus` is for. — n. 1.8e9-where's-my-share m., Jan 02 '14 at 06:41

score 2 · Accepted Answer · edited May 23 '17 at 11:49

2

I suspect that you need to run ./configure on the libdivsufsort directory again with the CC environment variable pre-set for the compiler you intend to use. (CC for "c" code. CXX for c++ code). Then rebuild.

cd ~/libdivsufsort-2.0.1
make clean
CC=gcc
CXX=g++
./configure
make

Try this link: Configuring for a compiler different than the default while running configure

edited May 23 '17 at 11:49

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answered Jan 02 '14 at 05:54

selbie

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Library works with Clang but not with GCC

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