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| author | ljrittle <ljrittle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-06-12 23:09:09 +0000 |
|---|---|---|
| committer | ljrittle <ljrittle@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-06-12 23:09:09 +0000 |
| commit | 2a793f18526a05291129d30cab5a446d4d4c0946 (patch) | |
| tree | c1c7768a7c3fa4e6421e9078340dd04bd57fa444 /libstdc++-v3/config/os/bsd | |
| parent | c2f3d0d8d9835425bc5754dadde13eb03a6cf655 (diff) | |
| download | ppe42-gcc-2a793f18526a05291129d30cab5a446d4d4c0946.tar.gz ppe42-gcc-2a793f18526a05291129d30cab5a446d4d4c0946.zip | |
libstdc++/2071
* porting.texi: Add documentation about libstdc++-v3-specific
macros that are currently included in os_defines.h files.
* config/basic_file_stdio.h (sys_getc): New method.
(sys_ungetc): New method.
* include/bits/basic_file.h: (sys_getc): New method signature.
(sys_ungetc): New method signature.
* include/bits/fstream.tcc (underflow): Add conditional code
paths which avoid using short seeks on streams (especially
useful when the stream might be interactive or a pipe). At
the moment, this alternate path only avoids seeking when the
``buffer size'' of underflow() is 1 since the C standard only
guarantees buffer space for one ungetc (this technique could
be extended since *-*-solaris* supports buffering for 4 calls
to ungetc and *-*-*bsd* supports buffering limited only by
memory resources). Also, _GLIBCPP_AVOID_FSEEK must be defined
in a port's os_defines.h file for this alternate path to even
be considered. As a bonus, the idiom of using getc/ungetc
requires no system calls whereas fseek maps to one or two
system call(s) on many platforms.
* config/os/bsd/freebsd/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK):
Define it.
* config/os/solaris/solaris2.5/bits/os_defines.h
(_GLIBCPP_AVOID_FSEEK): Likewise.
* config/os/solaris/solaris2.6/bits/os_defines.h
(_GLIBCPP_AVOID_FSEEK): Likewise.
* config/os/solaris/solaris2.7/bits/os_defines.h
(_GLIBCPP_AVOID_FSEEK): Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43278 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libstdc++-v3/config/os/bsd')
| -rw-r--r-- | libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h b/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h index 1cb71d149ec..3a6803f8f3d 100644 --- a/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h +++ b/libstdc++-v3/config/os/bsd/freebsd/bits/os_defines.h @@ -35,6 +35,7 @@ /* System-specific #define, typedefs, corrections, etc, go here. This file will come before all others. */ +#define _GLIBCPP_AVOID_FSEEK 1 #endif |
