How to keep g++ from taking header file from /usr/include?
- by WilliamKF
I am building using zlib.h which I have a local copy to v1.2.5, but in /usr/include/zlib.h there is v1.2.1.2.
If I omit adding -I/my/path/to/zlib to my make I get error from using old version which doesn't have Z_FIXED:
g++ -g -Werror -Wredundant-decls -D_FILE_OFFSET_BITS=64 -c -o ARCH.linux_26_i86/debug/sysParam.o sysParam.cpp
sysParam.cpp: In member function `std::string CSysParamAccess::getCompressionStrategyName() const':
sysParam.cpp:1816: error: `Z_FIXED' was not declared in this scope
sysParam.cpp: In member function `bool CSysParamAccess::setCompressionStrategy(const std::string&, paramSource)':
sysParam.cpp:1849: error: `Z_FIXED' was not declared in this scope
Alternatively, if I add the include path to the zlib z1.2.5 I am using, I get double defines, it seems as if the zlib.h is included twice with two different sets of -D values, but I don't see how that is happening:
g++ -g -Werror -Wredundant-decls -I../../src/zlib-1.2.5 -D_FILE_OFFSET_BITS=64 -c -o ARCH.linux_26_i86/debug/sysParam.o sysParam.cpp
In file included from sysParam.cpp:24:
../../src/zlib-1.2.5/zlib.h:1582: warning: redundant redeclaration of `void* gzopen64(const char*, const char*)' in same scope
../../src/zlib-1.2.5/zlib.h:1566: warning: previous declaration of `void* gzopen64(const char*, const char*)'
../../src/zlib-1.2.5/zlib.h:1583: warning: redundant redeclaration of `long long int gzseek64(void*, long long int, int)' in same scope
../../src/zlib-1.2.5/zlib.h:1567: warning: previous declaration of `off64_t gzseek64(void*, off64_t, int)'
../../src/zlib-1.2.5/zlib.h:1584: warning: redundant redeclaration of `long long int gztell64(void*)' in same scope
../../src/zlib-1.2.5/zlib.h:1568: warning: previous declaration of `off64_t gztell64(void*)'
../../src/zlib-1.2.5/zlib.h:1585: warning: redundant redeclaration of `long long int gzoffset64(void*)' in same scope
../../src/zlib-1.2.5/zlib.h:1569: warning: previous declaration of `off64_t gzoffset64(void*)'
../../src/zlib-1.2.5/zlib.h:1586: warning: redundant redeclaration of `uLong adler32_combine64(uLong, uLong, long long int)' in same scope
../../src/zlib-1.2.5/zlib.h:1570: warning: previous declaration of `uLong adler32_combine64(uLong, uLong, off64_t)'
../../src/zlib-1.2.5/zlib.h:1587: warning: redundant redeclaration of `uLong crc32_combine64(uLong, uLong, long long int)' in same scope
../../src/zlib-1.2.5/zlib.h:1571: warning: previous declaration of `uLong crc32_combine64(uLong, uLong, off64_t)'
Here some of the relavent lines from zlib.h referred to above:
// This would be line 1558 of zlib.h
/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
* change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
* both are true, the application gets the *64 functions, and the regular
* functions are changed to 64 bits) -- in case these are set on systems
* without large file support, _LFS64_LARGEFILE must also be true
*/
#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
#endif
#if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
# define gzopen gzopen64
# define gzseek gzseek64
# define gztell gztell64
# define gzoffset gzoffset64
# define adler32_combine adler32_combine64
# define crc32_combine crc32_combine64
# ifdef _LARGEFILE64_SOURCE
ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
# endif
#else
ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
#endif
// This would be line 1597 of zlib.h
I'm not sure how to track this down further. I tried moving the include of zlib.h to the top and bottom of the includes list of the cpp file, but it made no difference.
An excerpt of passing -E to g++ shows in part:
extern int inflateInit2_ (z_streamp strm, int windowBits, const char *version, int stream_size);
extern int inflateBackInit_ (z_streamp strm, int windowBits, unsigned char *window, const char *version, int stream_size);
# 1566 "../../src/zlib-1.2.5/zlib.h"
extern gzFile gzopen64 (const char *, const char *);
extern off64_t gzseek64 (gzFile, off64_t, int);
extern off64_t gztell64 (gzFile);
extern off64_t gzoffset64 (gzFile);
extern uLong adler32_combine64 (uLong, uLong, off64_t);
extern uLong crc32_combine64 (uLong, uLong, off64_t);
# 1582 "../../src/zlib-1.2.5/zlib.h"
extern gzFile gzopen64 (const char *, const char *);
extern long long gzseek64 (gzFile, long long, int);
extern long long gztell64 (gzFile);
extern long long gzoffset64 (gzFile);
extern uLong adler32_combine64 (uLong, uLong, long long);
extern uLong crc32_combine64 (uLong, uLong, long long);
# 1600 "../../src/zlib-1.2.5/zlib.h"
struct internal_state {int dummy;};
Not sure why lines 1566 and 1582 are coming out together in the CPP output, but hence the warning about duplicate declarations.
