mirror/autoconf
2
0
Fork 0
mirror of git://git.sv.gnu.org/autoconf synced 2025-02-23 14:09:51 +08:00
Code Issues Packages Projects Releases Wiki Activity

* NEWS: Documented changes in AC_PROG_CPP and AC_TRY_CPP.

Browse Source 
* doc/autoconf.texi (Compilers and Preprocessors): Likewise.
        * acgeneral.m4 (AC_TRY_CPP): Comment changes.
This commit is contained in:
Pavel Roskin 2000-10-20 00:15:34 +00:00
parent 247e1d11ad
commit 1328e61cb7
5 changed files with 29 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
ChangeLog
View File

@ -1,3 +1,9 @@
2000-10-19 Pavel Roskin <proski@gnu.org>
* NEWS: Documented changes in AC_PROG_CPP and AC_TRY_CPP.
* doc/autoconf.texi (Compilers and Preprocessors): Likewise.
* acgeneral.m4 (AC_TRY_CPP): Comment changes.
2000-10-19 Pavel Roskin <proski@gnu.org>
* doc/autoconf.texi (Shellology): Documented quirks in ash-0.2.

4
NEWS
View File

@ -191,6 +191,10 @@ test cases in this new frame work.
Checks if the compiler supports ISO C, included when needs special
options.
- AC_PROG_CPP
Checking whether the preprocessor indicates missing includes by the
error code. stderr is checked by AC_TRY_CPP only as a fallback.
- AC_LANG
Takes a language as argument and replaces AC_LANG_C,
AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.

7
acgeneral.m4
View File

@ -3389,10 +3389,9 @@ fi
# AC_TRY_CPP(INCLUDES, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# ---------------------------------------------------------
# Capture the stderr of cpp. eval is necessary to expand ac_cpp. We
# used to copy stderr to stdout and capture it in a variable, but that
# breaks under sh -x, which writes compile commands starting with ` +'
# to stderr in eval and subshells.
# AC_TRY_CPP is used to check whether particular header files exist.
# You can check for one at a time, or more than one if you need several
# header files to all exist for some purpose.
#
# INCLUDES are not defaulted.
AC_DEFUN([AC_TRY_CPP],

15
doc/autoconf.texi
View File

@ -4057,7 +4057,7 @@ using the program @code{ansi2knr}, which comes with Automake.
@maindex PROG_CPP
@ovindex CPP
Set output variable @code{CPP} to a command that runs the
C preprocessor. If @samp{$CC -E} doesn't work, it uses @file{/lib/cpp}.
C preprocessor. If @samp{$CC -E} doesn't work, @file{/lib/cpp} is used.
It is only portable to run @code{CPP} on files with a @file{.c}
extension.
@ -4065,6 +4065,11 @@ If the current language is C (@pxref{Language Choice}), many of the
specific test macros use the value of @code{CPP} indirectly by calling
@code{AC_TRY_CPP}, @code{AC_CHECK_HEADER}, @code{AC_EGREP_HEADER}, or
@code{AC_EGREP_CPP}.
Some preprocessors don't indicate missing include files by the error
status. For such preprocessors an internal variable is set that causes
other macros to check the standard error from the preprocessor and
consider the test failed if any warnings have been reported.
@end defmac
@defmac AC_PROG_CXX (@ovar{compiler-search-list})
@ -4102,7 +4107,7 @@ compilers.
@maindex PROG_CXXCPP
@ovindex CXXCPP
Set output variable @code{CXXCPP} to a command that runs the C++
preprocessor. If @samp{$CXX -E} doesn't work, it uses @file{/lib/cpp}.
preprocessor. If @samp{$CXX -E} doesn't work, @file{/lib/cpp} is used.
It is only portable to run @code{CXXCPP} on files with a @file{.c},
@file{.C}, or @file{.cc} extension.
@ -4110,6 +4115,12 @@ If the current language is C++ (@pxref{Language Choice}), many of the
specific test macros use the value of @code{CXXCPP} indirectly by
calling @code{AC_TRY_CPP}, @code{AC_CHECK_HEADER},
@code{AC_EGREP_HEADER}, or @code{AC_EGREP_CPP}.
Some preprocessors don't indicate missing include files by the error
status. For such preprocessors an internal variable is set that causes
other macros to check the standard error from the preprocessor and
consider the test failed if any warnings have been reported. However,
it is not known whether such broken preprocessors exist for C++.
@end defmac
@defmac AC_PROG_F77 (@ovar{compiler-search-list})

7
lib/autoconf/general.m4
View File

@ -3389,10 +3389,9 @@ fi
# AC_TRY_CPP(INCLUDES, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# ---------------------------------------------------------
# Capture the stderr of cpp. eval is necessary to expand ac_cpp. We
# used to copy stderr to stdout and capture it in a variable, but that
# breaks under sh -x, which writes compile commands starting with ` +'
# to stderr in eval and subshells.
# AC_TRY_CPP is used to check whether particular header files exist.
# You can check for one at a time, or more than one if you need several
# header files to all exist for some purpose.
#
# INCLUDES are not defaulted.
AC_DEFUN([AC_TRY_CPP],