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Diffstat (limited to 'submodules/autoconf/lib/autoconf/lang.m4')
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| -rw-r--r-- | submodules/autoconf/lib/autoconf/lang.m4 | 721 |
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diff --git a/submodules/autoconf b/submodules/autoconf deleted file mode 160000 -Subproject 8cb01740a0b7044feafcc51ea980583311e52a9 diff --git a/submodules/autoconf/lib/autoconf/lang.m4 b/submodules/autoconf/lib/autoconf/lang.m4 new file mode 100644 index 00000000..49822501 --- /dev/null +++ b/submodules/autoconf/lib/autoconf/lang.m4 @@ -0,0 +1,721 @@ +# This file is part of Autoconf. -*- Autoconf -*- +# Programming languages support. +# Copyright (C) 2000-2002, 2004-2011 Free Software Foundation, Inc. + +# This file is part of Autoconf. This program is free +# software; you can redistribute it and/or modify it under the +# terms of the GNU General Public License as published by the +# Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# Under Section 7 of GPL version 3, you are granted additional +# permissions described in the Autoconf Configure Script Exception, +# version 3.0, as published by the Free Software Foundation. +# +# You should have received a copy of the GNU General Public License +# and a copy of the Autoconf Configure Script Exception along with +# this program; see the files COPYINGv3 and COPYING.EXCEPTION +# respectively. If not, see <http://www.gnu.org/licenses/>. + +# Written by David MacKenzie, with help from +# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor, +# Roland McGrath, Noah Friedman, david d zuhn, and many others. + + +# Table of Contents: +# +# 1. Language selection +# and routines to produce programs in a given language. +# +# 2. Producing programs in a given language. +# +# 3. Looking for a compiler +# And possibly the associated preprocessor. +# +# 3a. Computing EXEEXT and OBJEXT. +# +# 4. Compilers' characteristics. + + + +## ----------------------- ## +## 1. Language selection. ## +## ----------------------- ## + + +# AC_LANG_CASE(LANG1, IF-LANG1, LANG2, IF-LANG2, ..., DEFAULT) +# ------------------------------------------------------------ +# Expand into IF-LANG1 if the current language is LANG1 etc. else +# into default. +m4_define([AC_LANG_CASE], +[m4_case(_AC_LANG, $@)]) + + +# _AC_LANG_DISPATCH(MACRO, LANG, ARGS) +# ------------------------------------ +# Call the specialization of MACRO for LANG with ARGS. Complain if +# unavailable. +m4_define([_AC_LANG_DISPATCH], +[m4_ifdef([$1($2)], + [m4_indir([$1($2)], m4_shift2($@))], + [m4_fatal([$1: unknown language: $2])])]) + + +# _AC_LANG_SET(OLD, NEW) +# ---------------------- +# Output the shell code needed to switch from OLD language to NEW language. +# Do not try to optimize like this: +# +# m4_defun([_AC_LANG_SET], +# [m4_if([$1], [$2], [], +# [_AC_LANG_DISPATCH([AC_LANG], [$2])])]) +# +# as it can introduce differences between the sh-current language and the +# m4-current-language when m4_require is used. Something more subtle +# might be possible, but at least for the time being, play it safe. +m4_defun([_AC_LANG_SET], +[_AC_LANG_DISPATCH([AC_LANG], [$2])]) + + +# AC_LANG(LANG) +# ------------- +# Set the current language to LANG. +m4_defun([AC_LANG], +[_AC_LANG_SET(m4_ifdef([_AC_LANG], [m4_defn([_AC_LANG])]), + [$1])dnl +m4_define([_AC_LANG], [$1])]) + + +# AC_LANG_PUSH(LANG) +# ------------------ +# Save the current language, and use LANG. +m4_defun([AC_LANG_PUSH], +[_AC_LANG_SET(m4_ifdef([_AC_LANG], [m4_defn([_AC_LANG])]), + [$1])dnl +m4_pushdef([_AC_LANG], [$1])]) + + +# AC_LANG_POP([LANG]) +# ------------------- +# If given, check that the current language is LANG, and restore the +# previous language. +m4_defun([AC_LANG_POP], +[m4_ifval([$1], + [m4_if([$1], m4_defn([_AC_LANG]), [], + [m4_fatal([$0($1): unexpected current language: ]m4_defn([_AC_LANG]))])])dnl +m4_pushdef([$0 OLD], m4_defn([_AC_LANG]))dnl +m4_popdef([_AC_LANG])dnl +_AC_LANG_SET(m4_defn([$0 OLD]), m4_defn([_AC_LANG]))dnl +m4_popdef([$0 OLD])dnl +]) + + +# AC_LANG_SAVE +# ------------ +# Save the current language, but don't change language. +AU_DEFUN([AC_LANG_SAVE], +[[AC_LANG_SAVE]], +[Instead of using `AC_LANG', `AC_LANG_SAVE', and `AC_LANG_RESTORE', +you should use `AC_LANG_PUSH' and `AC_LANG_POP'.]) +AC_DEFUN([AC_LANG_SAVE], +[m4_pushdef([_AC_LANG], _AC_LANG)dnl +AC_DIAGNOSE([obsolete], [The macro `AC_LANG_SAVE' is obsolete. +You should run autoupdate.])]) + + +# AC_LANG_RESTORE +# --------------- +# Restore the current language from the stack. +AU_DEFUN([AC_LANG_RESTORE], [AC_LANG_POP($@)]) + + +# _AC_LANG_ABBREV +# --------------- +# Return a short signature of _AC_LANG which can be used in shell +# variable names, or in M4 macro names. +m4_defun([_AC_LANG_ABBREV], +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# _AC_LANG_PREFIX +# --------------- +# Return a short (upper case) signature of _AC_LANG that is used to +# prefix environment variables like FLAGS. +m4_defun([_AC_LANG_PREFIX], +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_ASSERT(LANG) +# -------------------- +# Current language must be LANG. +m4_defun([AC_LANG_ASSERT], +[m4_if(_AC_LANG, $1, [], + [m4_fatal([$0: current language is not $1: ] _AC_LANG)])]) + + + +# AC_LANG_DEFINE(NAME, ABBREV, PREFIX, COMPILER-VAR, COPY-FROM, SHELL-VARS) +# ------------------------------------------------------------------------- +# Define a language referenced by AC_LANG(NAME), with cache variable prefix +# ABBREV, Makefile variable prefix PREFIX and compiler variable COMPILER-VAR. +# AC_LANG(NAME) is defined to SHELL-VARS, other macros are copied from language +# COPY-FROM. Even if COPY-FROM is empty, a default definition is provided for +# language-specific macros AC_LANG_SOURCE(NAME) and AC_LANG_CONFTEST(NAME). +m4_define([AC_LANG_DEFINE], +[m4_define([AC_LANG($1)], [$6])] +[m4_define([_AC_LANG_ABBREV($1)], [$2])] +[m4_define([_AC_LANG_PREFIX($1)], [$3])] +[m4_define([_AC_CC($1)], [$4])] +[m4_copy([AC_LANG_CONFTEST($5)], [AC_LANG_CONFTEST($1)])] +[m4_copy([AC_LANG_SOURCE($5)], [AC_LANG_SOURCE($1)])] +[m4_copy([_AC_LANG_NULL_PROGRAM($5)], [_AC_LANG_NULL_PROGRAM($1)])] +[m4_ifval([$5], +[m4_copy([AC_LANG_PROGRAM($5)], [AC_LANG_PROGRAM($1)])] +[m4_copy([AC_LANG_CALL($5)], [AC_LANG_CALL($1)])] +[m4_copy([AC_LANG_FUNC_LINK_TRY($5)], [AC_LANG_FUNC_LINK_TRY($1)])] +[m4_copy([AC_LANG_BOOL_COMPILE_TRY($5)], [AC_LANG_BOOL_COMPILE_TRY($1)])] +[m4_copy([AC_LANG_INT_SAVE($5)], [AC_LANG_INT_SAVE($1)])] +[m4_copy([_AC_LANG_IO_PROGRAM($5)], [_AC_LANG_IO_PROGRAM($1)])])]) + +## ----------------------- ## +## 2. Producing programs. ## +## ----------------------- ## + + +# AC_LANG_CONFTEST(BODY) +# ---------------------- +# Save the BODY in `conftest.$ac_ext'. Add a trailing new line. +AC_DEFUN([AC_LANG_CONFTEST], +[m4_pushdef([_AC_LANG_DEFINES_PROVIDED], + [m4_warn([syntax], [$0: no AC_LANG_SOURCE call detected in body])])]dnl +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]dnl +[[]_AC_LANG_DEFINES_PROVIDED[]m4_popdef([_AC_LANG_DEFINES_PROVIDED])]) + + +# AC_LANG_CONFTEST()(BODY) +# ------------------------ +# Default implementation of AC_LANG_CONFTEST. +# This version assumes that you can't inline confdefs.h into your +# language, and as such, it is safe to blindly call +# AC_LANG_DEFINES_PROVIDED. Language-specific overrides should +# remove this call if AC_LANG_SOURCE does inline confdefs.h. +m4_define([AC_LANG_CONFTEST()], +[cat > conftest.$ac_ext <<_ACEOF +AC_LANG_DEFINES_PROVIDED[]$1 +_ACEOF]) + +# AC_LANG_DEFINES_PROVIDED +# ------------------------ +# Witness macro that all prior AC_DEFINE results have been output +# into the current expansion, to silence warning from AC_LANG_CONFTEST. +m4_define([AC_LANG_DEFINES_PROVIDED], +[m4_define([_$0])]) + + +# AC_LANG_SOURCE(BODY) +# -------------------- +# Produce a valid source for the current language, which includes the +# BODY, and as much as possible `confdefs.h'. +AC_DEFUN([AC_LANG_SOURCE], +[AC_LANG_DEFINES_PROVIDED[]_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_SOURCE()(BODY) +# ---------------------- +# Default implementation of AC_LANG_SOURCE. +m4_define([AC_LANG_SOURCE()], +[$1]) + + +# AC_LANG_PROGRAM([PROLOGUE], [BODY]) +# ----------------------------------- +# Produce a valid source for the current language. Prepend the +# PROLOGUE (typically CPP directives and/or declarations) to an +# execution the BODY (typically glued inside the `main' function, or +# equivalent). +AC_DEFUN([AC_LANG_PROGRAM], +[AC_LANG_SOURCE([_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])]) + + +# _AC_LANG_NULL_PROGRAM()() +# ------------------------- +# Default implementation of AC_LANG_NULL_PROGRAM +m4_define([_AC_LANG_NULL_PROGRAM()], +[AC_LANG_PROGRAM([], [])]) + + +# _AC_LANG_NULL_PROGRAM +# --------------------- +# Produce valid source for the current language that does +# nothing. +AC_DEFUN([_AC_LANG_NULL_PROGRAM], +[AC_LANG_SOURCE([_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])]) + + +# _AC_LANG_IO_PROGRAM +# ------------------- +# Produce valid source for the current language that creates +# a file. (This is used when detecting whether executables +# work, e.g. to detect cross-compiling.) +AC_DEFUN([_AC_LANG_IO_PROGRAM], +[AC_LANG_SOURCE([_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])]) + + +# AC_LANG_CALL(PROLOGUE, FUNCTION) +# -------------------------------- +# Call the FUNCTION. +AC_DEFUN([AC_LANG_CALL], +[m4_ifval([$2], [], [m4_warn([syntax], [$0: no function given])])dnl +_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_FUNC_LINK_TRY(FUNCTION) +# ------------------------------- +# Produce a source which links correctly iff the FUNCTION exists. +AC_DEFUN([AC_LANG_FUNC_LINK_TRY], +[m4_ifval([$1], [], [m4_warn([syntax], [$0: no function given])])dnl +_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_BOOL_COMPILE_TRY(PROLOGUE, EXPRESSION) +# ---------------------------------------------- +# Produce a program that compiles with success iff the boolean EXPRESSION +# evaluates to true at compile time. +AC_DEFUN([AC_LANG_BOOL_COMPILE_TRY], +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_INT_SAVE(PROLOGUE, EXPRESSION) +# -------------------------------------- +# Produce a program that saves the runtime evaluation of the integer +# EXPRESSION into `conftest.val'. +AC_DEFUN([AC_LANG_INT_SAVE], +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# _AC_CC +# ------ +# The variable name of the compiler. +m4_define([_AC_CC], +[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +## -------------------------------------------- ## +## 3. Looking for Compilers and Preprocessors. ## +## -------------------------------------------- ## + + +# AC_LANG_COMPILER +# ---------------- +# Find a compiler for the current LANG. Be sure to be run before +# AC_LANG_PREPROC. +# +# Note that because we might AC_REQUIRE `AC_LANG_COMPILER(C)' for +# instance, the latter must be AC_DEFUN'd, not just define'd. +m4_define([AC_LANG_COMPILER], +[AC_BEFORE([AC_LANG_COMPILER(]_AC_LANG[)], + [AC_LANG_PREPROC(]_AC_LANG[)])dnl +_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_COMPILER_REQUIRE +# ------------------------ +# Ensure we have a compiler for the current LANG. +AC_DEFUN([AC_LANG_COMPILER_REQUIRE], +[m4_require([AC_LANG_COMPILER(]_AC_LANG[)], + [AC_LANG_COMPILER])]) + + + +# _AC_LANG_COMPILER_GNU +# --------------------- +# Check whether the compiler for the current language is GNU. +# +# It doesn't seem necessary right now to have a different source +# according to the current language, since this works fine. Some day +# it might be needed. Nevertheless, pay attention to the fact that +# the position of `choke me' on the seventh column is meant: otherwise +# some Fortran compilers (e.g., SGI) might consider it's a +# continuation line, and warn instead of reporting an error. +m4_define([_AC_LANG_COMPILER_GNU], +[AC_CACHE_CHECK([whether we are using the GNU _AC_LANG compiler], + [ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu], +[_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[#ifndef __GNUC__ + choke me +#endif +]])], + [ac_compiler_gnu=yes], + [ac_compiler_gnu=no]) +ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu=$ac_compiler_gnu +])])# _AC_LANG_COMPILER_GNU + + +# AC_LANG_PREPROC +# --------------- +# Find a preprocessor for the current language. Note that because we +# might AC_REQUIRE `AC_LANG_PREPROC(C)' for instance, the latter must +# be AC_DEFUN'd, not just define'd. Since the preprocessor depends +# upon the compiler, look for the compiler. +m4_define([AC_LANG_PREPROC], +[AC_LANG_COMPILER_REQUIRE()dnl +_AC_LANG_DISPATCH([$0], _AC_LANG, $@)]) + + +# AC_LANG_PREPROC_REQUIRE +# ----------------------- +# Ensure we have a preprocessor for the current language. +AC_DEFUN([AC_LANG_PREPROC_REQUIRE], +[m4_require([AC_LANG_PREPROC(]_AC_LANG[)], + [AC_LANG_PREPROC])]) + + +# AC_REQUIRE_CPP +# -------------- +# Require the preprocessor for the current language. +# FIXME: AU_ALIAS once AC_LANG is officially documented (2.51?). +AC_DEFUN([AC_REQUIRE_CPP], +[AC_LANG_PREPROC_REQUIRE]) + + + +# AC_NO_EXECUTABLES +# ----------------- +# FIXME: The GCC team has specific needs which the current Autoconf +# framework cannot solve elegantly. This macro implements a dirty +# hack until Autoconf is able to provide the services its users +# need. +# +# Several of the support libraries that are often built with GCC can't +# assume the tool-chain is already capable of linking a program: the +# compiler often expects to be able to link with some of such +# libraries. +# +# In several of these libraries, workarounds have been introduced to +# avoid the AC_PROG_CC_WORKS test, that would just abort their +# configuration. The introduction of AC_EXEEXT, enabled either by +# libtool or by CVS autoconf, have just made matters worse. +# +# Unlike an earlier version of this macro, using AC_NO_EXECUTABLES does +# not disable link tests at autoconf time, but at configure time. +# This allows AC_NO_EXECUTABLES to be invoked conditionally. +AC_DEFUN_ONCE([AC_NO_EXECUTABLES], +[m4_divert_push([KILL]) +m4_divert_text([DEFAULTS], [ac_no_link=no]) + +AC_BEFORE([$0], [_AC_COMPILER_EXEEXT]) +AC_BEFORE([$0], [AC_LINK_IFELSE]) + +m4_define([_AC_COMPILER_EXEEXT], +[AC_LANG_CONFTEST([_AC_LANG_NULL_PROGRAM]) +if _AC_DO_VAR(ac_link); then + ac_no_link=no + ]m4_defn([_AC_COMPILER_EXEEXT])[ +else + rm -f -r a.out a.exe b.out conftest.$ac_ext conftest.o conftest.obj conftest.dSYM + ac_no_link=yes + # Setting cross_compile will disable run tests; it will + # also disable AC_CHECK_FILE but that's generally + # correct if we can't link. + cross_compiling=yes + EXEEXT= + _AC_COMPILER_EXEEXT_CROSS +fi +]) + +m4_define([AC_LINK_IFELSE], +[if test x$ac_no_link = xyes; then + AC_MSG_ERROR([link tests are not allowed after AC@&t@_NO_EXECUTABLES]) +fi +]m4_defn([AC_LINK_IFELSE])) + +m4_divert_pop()dnl +])# AC_NO_EXECUTABLES + + + +# --------------------------------- # +# 3a. Computing EXEEXT and OBJEXT. # +# --------------------------------- # + + +# Files to ignore +# --------------- +# Ignore .d files produced by CFLAGS=-MD. +# +# On UWIN (which uses a cc wrapper for MSVC), the compiler also generates +# a .pdb file +# +# When the w32 free Borland C++ command line compiler links a program +# (conftest.exe), it also produces a file named `conftest.tds' in +# addition to `conftest.obj'. +# +# - *.bb, *.bbg +# Created per object by GCC when given -ftest-coverage. +# +# - *.xSYM +# Created on BeOS. Seems to be per executable. +# +# - *.map, *.inf +# Created by the Green Hills compiler. +# +# - *.dSYM +# Directory created on Mac OS X Leopard. + + +# _AC_COMPILER_OBJEXT_REJECT +# -------------------------- +# Case/esac pattern matching the files to be ignored when looking for +# compiled object files. +m4_define([_AC_COMPILER_OBJEXT_REJECT], +[*.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM]) + + +# _AC_COMPILER_EXEEXT_REJECT +# -------------------------- +# Case/esac pattern matching the files to be ignored when looking for +# compiled executables. +m4_define([_AC_COMPILER_EXEEXT_REJECT], +[_AC_COMPILER_OBJEXT_REJECT | *.o | *.obj]) + + +# We must not AU define them, because autoupdate would then remove +# them, which is right, but Automake 1.4 would remove the support for +# $(EXEEXT) etc. +# FIXME: Remove this once Automake fixed. +AC_DEFUN([AC_EXEEXT], []) +AC_DEFUN([AC_OBJEXT], []) + + +# _AC_COMPILER_EXEEXT_DEFAULT +# --------------------------- +# Check for the extension used for the default name for executables. +# +# We do this in order to find out what is the extension we must add for +# creating executables (see _AC_COMPILER_EXEEXT's comments). +# +# On OpenVMS 7.1 system, the DEC C 5.5 compiler when called through a +# GNV (gnv.sourceforge.net) cc wrapper, produces the output file named +# `a_out.exe'. +# b.out is created by i960 compilers. +# +# Start with the most likely output file names, but: +# 1) Beware the clever `test -f' on Cygwin, try the DOS-like .exe names +# before the counterparts without the extension. +# 2) The algorithm is not robust to junk in `.', hence go to wildcards +# (conftest.*) only as a last resort. +# Beware of `expr' that may return `0' or `'. Since this macro is +# the first one in touch with the compiler, it should also check that +# it compiles properly. +# +# The IRIX 6 linker writes into existing files which may not be +# executable, retaining their permissions. Remove them first so a +# subsequent execution test works. +# +m4_define([_AC_COMPILER_EXEEXT_DEFAULT], +[# Try to create an executable without -o first, disregard a.out. +# It will help us diagnose broken compilers, and finding out an intuition +# of exeext. +AC_MSG_CHECKING([whether the _AC_LANG compiler works]) +ac_link_default=`AS_ECHO(["$ac_link"]) | sed ['s/ -o *conftest[^ ]*//']` + +# The possible output files: +ac_files="a.out conftest.exe conftest a.exe a_out.exe b.out conftest.*" + +ac_rmfiles= +for ac_file in $ac_files +do + case $ac_file in + _AC_COMPILER_EXEEXT_REJECT ) ;; + * ) ac_rmfiles="$ac_rmfiles $ac_file";; + esac +done +rm -f $ac_rmfiles + +AS_IF([_AC_DO_VAR(ac_link_default)], +[# Autoconf-2.13 could set the ac_cv_exeext variable to `no'. +# So ignore a value of `no', otherwise this would lead to `EXEEXT = no' +# in a Makefile. We should not override ac_cv_exeext if it was cached, +# so that the user can short-circuit this test for compilers unknown to +# Autoconf. +for ac_file in $ac_files '' +do + test -f "$ac_file" || continue + case $ac_file in + _AC_COMPILER_EXEEXT_REJECT ) + ;; + [[ab]].out ) + # We found the default executable, but exeext='' is most + # certainly right. + break;; + *.* ) + if test "${ac_cv_exeext+set}" = set && test "$ac_cv_exeext" != no; + then :; else + ac_cv_exeext=`expr "$ac_file" : ['[^.]*\(\..*\)']` + fi + # We set ac_cv_exeext here because the later test for it is not + # safe: cross compilers may not add the suffix if given an `-o' + # argument, so we may need to know it at that point already. + # Even if this section looks crufty: it has the advantage of + # actually working. + break;; + * ) + break;; + esac +done +test "$ac_cv_exeext" = no && ac_cv_exeext= +], + [ac_file='']) +AS_IF([test -z "$ac_file"], +[AC_MSG_RESULT([no]) +_AC_MSG_LOG_CONFTEST +AC_MSG_FAILURE([_AC_LANG compiler cannot create executables], 77)], +[AC_MSG_RESULT([yes])]) +AC_MSG_CHECKING([for _AC_LANG compiler default output file name]) +AC_MSG_RESULT([$ac_file]) +ac_exeext=$ac_cv_exeext +])# _AC_COMPILER_EXEEXT_DEFAULT + + +# _AC_COMPILER_EXEEXT_CROSS +# ------------------------- +# FIXME: These cross compiler hacks should be removed for Autoconf 3.0 +# +# It is not sufficient to run a no-op program -- this succeeds and gives +# a false negative when cross-compiling for the compute nodes on the +# IBM Blue Gene/L. Instead, _AC_COMPILER_EXEEXT calls _AC_LANG_IO_PROGRAM +# to create a program that writes to a file, which is sufficient to +# detect cross-compiling on Blue Gene. Note also that AC_COMPUTE_INT +# requires programs that create files when not cross-compiling, so it +# is safe and not a bad idea to check for this capability in general. +m4_define([_AC_COMPILER_EXEEXT_CROSS], +[# Check that the compiler produces executables we can run. If not, either +# the compiler is broken, or we cross compile. +AC_MSG_CHECKING([whether we are cross compiling]) +if test "$cross_compiling" != yes; then + _AC_DO_VAR(ac_link) + if _AC_DO_TOKENS([./conftest$ac_cv_exeext]); then + cross_compiling=no + else + if test "$cross_compiling" = maybe; then + cross_compiling=yes + else + AC_MSG_FAILURE([cannot run _AC_LANG compiled programs. +If you meant to cross compile, use `--host'.]) + fi + fi +fi +AC_MSG_RESULT([$cross_compiling]) +])# _AC_COMPILER_EXEEXT_CROSS + + +# _AC_COMPILER_EXEEXT_O +# --------------------- +# Check for the extension used when `-o foo'. Try to see if ac_cv_exeext, +# as computed by _AC_COMPILER_EXEEXT_DEFAULT is OK. +m4_define([_AC_COMPILER_EXEEXT_O], +[AC_MSG_CHECKING([for suffix of executables]) +AS_IF([_AC_DO_VAR(ac_link)], +[# If both `conftest.exe' and `conftest' are `present' (well, observable) +# catch `conftest.exe'. For instance with Cygwin, `ls conftest' will +# work properly (i.e., refer to `conftest.exe'), while it won't with +# `rm'. +for ac_file in conftest.exe conftest conftest.*; do + test -f "$ac_file" || continue + case $ac_file in + _AC_COMPILER_EXEEXT_REJECT ) ;; + *.* ) ac_cv_exeext=`expr "$ac_file" : ['[^.]*\(\..*\)']` + break;; + * ) break;; + esac +done], + [AC_MSG_FAILURE([cannot compute suffix of executables: cannot compile and link])]) +rm -f conftest conftest$ac_cv_exeext +AC_MSG_RESULT([$ac_cv_exeext]) +])# _AC_COMPILER_EXEEXT_O + + +# _AC_COMPILER_EXEEXT +# ------------------- +# Check for the extension used for executables. It compiles a test +# executable. If this is called, the executable extensions will be +# automatically used by link commands run by the configure script. +# +# Note that some compilers (cross or not), strictly obey to `-o foo' while +# the host requires `foo.exe', so we should not depend upon `-o' to +# test EXEEXT. But then, be sure not to destroy user files. +# +# Must be run before _AC_COMPILER_OBJEXT because _AC_COMPILER_EXEEXT_DEFAULT +# checks whether the compiler works. +# +# Do not rename this macro; Automake decides whether EXEEXT is used +# by checking whether `_AC_COMPILER_EXEEXT' has been expanded. +# +# See _AC_COMPILER_EXEEXT_CROSS for why we need _AC_LANG_IO_PROGRAM. +m4_define([_AC_COMPILER_EXEEXT], +[AC_LANG_CONFTEST([_AC_LANG_NULL_PROGRAM]) +ac_clean_files_save=$ac_clean_files +ac_clean_files="$ac_clean_files a.out a.out.dSYM a.exe b.out" +_AC_COMPILER_EXEEXT_DEFAULT +rm -f -r a.out a.out.dSYM a.exe conftest$ac_cv_exeext b.out +ac_clean_files=$ac_clean_files_save +_AC_COMPILER_EXEEXT_O +rm -f conftest.$ac_ext +AC_SUBST([EXEEXT], [$ac_cv_exeext])dnl +ac_exeext=$EXEEXT +AC_LANG_CONFTEST([_AC_LANG_IO_PROGRAM]) +ac_clean_files="$ac_clean_files conftest.out" +_AC_COMPILER_EXEEXT_CROSS +rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out +ac_clean_files=$ac_clean_files_save +])# _AC_COMPILER_EXEEXT + + +# _AC_COMPILER_OBJEXT +# ------------------- +# Check the object extension used by the compiler: typically `.o' or +# `.obj'. If this is called, some other behavior will change, +# determined by ac_objext. +# +# This macro is called by AC_LANG_COMPILER, the latter being required +# by the AC_COMPILE_IFELSE macros, so use _AC_COMPILE_IFELSE. And in fact, +# don't, since _AC_COMPILE_IFELSE needs to know ac_objext for the `test -s' +# it includes. So do it by hand. +m4_define([_AC_COMPILER_OBJEXT], +[AC_CACHE_CHECK([for suffix of object files], ac_cv_objext, +[AC_LANG_CONFTEST([_AC_LANG_NULL_PROGRAM]) +rm -f conftest.o conftest.obj +AS_IF([_AC_DO_VAR(ac_compile)], +[for ac_file in conftest.o conftest.obj conftest.*; do + test -f "$ac_file" || continue; + case $ac_file in + _AC_COMPILER_OBJEXT_REJECT ) ;; + *) ac_cv_objext=`expr "$ac_file" : '.*\.\(.*\)'` + break;; + esac +done], + [_AC_MSG_LOG_CONFTEST +AC_MSG_FAILURE([cannot compute suffix of object files: cannot compile])]) +rm -f conftest.$ac_cv_objext conftest.$ac_ext]) +AC_SUBST([OBJEXT], [$ac_cv_objext])dnl +ac_objext=$OBJEXT +])# _AC_COMPILER_OBJEXT + + + + +## ------------------------------- ## +## 4. Compilers' characteristics. ## +## ------------------------------- ## + +# AC_LANG_WERROR +# -------------- +# Treat warnings from the current language's preprocessor, compiler, and +# linker as fatal errors. +AC_DEFUN([AC_LANG_WERROR], +[m4_divert_text([DEFAULTS], [ac_[]_AC_LANG_ABBREV[]_werror_flag=]) +ac_[]_AC_LANG_ABBREV[]_werror_flag=yes])# AC_LANG_WERROR |