diff options
Diffstat (limited to 'm4/gnulib-common.m4')
| -rw-r--r-- | m4/gnulib-common.m4 | 63 |
1 files changed, 32 insertions, 31 deletions
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4 index 33e56faa98e..2c0ae9bef40 100644 --- a/m4/gnulib-common.m4 +++ b/m4/gnulib-common.m4 @@ -1,4 +1,4 @@ -# gnulib-common.m4 serial 57 +# gnulib-common.m4 serial 63 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -483,23 +483,17 @@ AC_DEFUN([gl_FEATURES_H], # gl_PROG_CC_C99 # Modifies the value of the shell variable CC in an attempt to make $CC # understand ISO C99 source code. -# This is like AC_PROG_CC_C99, except that -# - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC -# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>, -# but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99 -# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>. -# Remaining problems: -# - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options -# to CC twice -# <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>. -# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard. AC_DEFUN([gl_PROG_CC_C99], [ - dnl Change that version number to the minimum Autoconf version that supports - dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls. - m4_version_prereq([9.0], - [AC_REQUIRE([AC_PROG_CC_C99])], - [AC_REQUIRE([AC_PROG_CC_STDC])]) + dnl Just use AC_PROG_CC_C99. + dnl When AC_PROG_CC_C99 and AC_PROG_CC_STDC are used together, the substituted + dnl value of CC will contain the C99 enabling options twice. But this is only + dnl a cosmetic problem. + dnl With Autoconf >= 2.70, use AC_PROG_CC since it implies AC_PROG_CC_C99; + dnl this avoids a "warning: The macro `AC_PROG_CC_C99' is obsolete." + m4_version_prereq([2.70], + [AC_REQUIRE([AC_PROG_CC])], + [AC_REQUIRE([AC_PROG_CC_C99])]) ]) # gl_PROG_AR_RANLIB @@ -573,16 +567,16 @@ Amsterdam ]) # AC_C_RESTRICT -# This definition is copied from post-2.69 Autoconf and overrides the -# AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed -# once autoconf >= 2.70 can be assumed. It's painful to check version -# numbers, and in practice this macro is more up-to-date than Autoconf -# is, so override Autoconf unconditionally. +# This definition is copied from post-2.70 Autoconf and overrides the +# AC_C_RESTRICT macro from autoconf 2.60..2.70. +m4_version_prereq([2.70.1], [], [ AC_DEFUN([AC_C_RESTRICT], [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], [ac_cv_c_restrict=no - # The order here caters to the fact that C++ does not require restrict. - for ac_kw in __restrict __restrict__ _Restrict restrict; do + # Put '__restrict__' first, to avoid problems with glibc and non-GCC; see: + # https://lists.gnu.org/archive/html/bug-autoconf/2016-02/msg00006.html + # Put 'restrict' last, because C++ lacks it. + for ac_kw in __restrict__ __restrict _Restrict restrict; do AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[typedef int *int_ptr; @@ -602,7 +596,7 @@ AC_DEFUN([AC_C_RESTRICT], AH_VERBATIM([restrict], [/* Define to the equivalent of the C99 'restrict' keyword, or to nothing if this is not supported. Do not define if restrict is - supported directly. */ + supported only directly. */ #undef restrict /* Work around a bug in older versions of Sun C++, which did not #define __restrict__ or support _Restrict or __restrict__ @@ -620,6 +614,7 @@ AC_DEFUN([AC_C_RESTRICT], *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; esac ])# AC_C_RESTRICT +]) # gl_BIGENDIAN # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. @@ -630,13 +625,20 @@ AC_DEFUN([gl_BIGENDIAN], AC_C_BIGENDIAN ]) +# A temporary file descriptor. +# Must be less than 10, because dash 0.5.8 does not support redirections +# with multi-digit file descriptors. +m4_define([GL_TMP_FD], 9) + # gl_SILENT(command) # executes command, but without the normal configure output. +# This is useful when you want to invoke AC_CACHE_CHECK (or AC_CHECK_FUNC etc.) +# inside another AC_CACHE_CHECK. AC_DEFUN([gl_SILENT], [ - { - $1 - } AS_MESSAGE_FD>/dev/null + exec GL_TMP_FD>&AS_MESSAGE_FD AS_MESSAGE_FD>/dev/null + $1 + exec AS_MESSAGE_FD>&GL_TMP_FD GL_TMP_FD>&- ]) # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) @@ -646,10 +648,9 @@ AC_DEFUN([gl_SILENT], # by an AC_MSG_CHECKING/AC_MSG_RESULT pair. AC_DEFUN([gl_CACHE_VAL_SILENT], [ - saved_as_echo_n="$as_echo_n" - as_echo_n=':' - AC_CACHE_VAL([$1], [$2]) - as_echo_n="$saved_as_echo_n" + gl_SILENT([ + AC_CACHE_VAL([$1], [$2]) + ]) ]) dnl Expands to some code for use in .c programs that, on native Windows, defines |