mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-22 07:03:38 +00:00
configure: Move basic C compiler environment checks to separate file.
Also gnulib stuff.
This commit is contained in:
Richard W.M. Jones
172
configure.ac
172
configure.ac
@@ -96,167 +96,8 @@ dnl Check for external programs required to either build or run
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dnl libguestfs.
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m4_include([m4/guestfs_progs.m4])
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dnl Define the host CPU architecture (defines 'host_cpu')
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AC_CANONICAL_HOST
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dnl Check for basic C environment.
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AC_PROG_CC_STDC
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AC_PROG_INSTALL
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AC_PROG_CPP
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AC_ARG_ENABLE([werror],
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[AS_HELP_STRING([--enable-werror],
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[turn GCC warnings into errors (for developers)])],
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[case $enableval in
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yes|no) ;;
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*) AC_MSG_ERROR([bad value $enableval for werror option]) ;;
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esac
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gl_gcc_werror=$enableval],
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[gl_gcc_werror=no]
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)
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if test "$gl_gcc_werror" = yes; then
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gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
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AC_SUBST([WERROR_CFLAGS])
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fi
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dnl This, $nw, is the list of warnings we disable.
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nw=
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nw="$nw -Waggregate-return" # anachronistic
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nw="$nw -Wc++-compat" # We don't care about C++ compilers
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nw="$nw -Wundef" # Warns on '#if GNULIB_FOO' etc in gnulib
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nw="$nw -Wtraditional" # Warns on #elif which we use often
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nw="$nw -Wcast-qual" # Too many warnings for now
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nw="$nw -Wconversion" # Too many warnings for now
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nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
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nw="$nw -Wsign-conversion" # Not an error
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nw="$nw -Wtraditional-conversion" # Don't care about pre-ANSI compilers
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nw="$nw -Wpadded" # Our structs are not padded
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nw="$nw -Wvla" # two warnings in mount.c
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dnl things I might fix soon:
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nw="$nw -Wmissing-format-attribute" # daemon.h's asprintf_nowarn
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nw="$nw -Winline" # daemon.h's asprintf_nowarn
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nw="$nw -Wshadow" # numerous, plus we're not unanimous
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nw="$nw -Wunsafe-loop-optimizations" # just a warning that an optimization
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# was not possible, safe to ignore
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nw="$nw -Wpacked" # Allow attribute((packed)) on structs
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nw="$nw -Wlong-long" # Allow long long since it's required
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# by Python, Ruby and xstrtoll.
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nw="$nw -Wsuggest-attribute=pure" # Don't suggest pure functions.
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nw="$nw -Wsuggest-attribute=const" # Don't suggest const functions.
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nw="$nw -Wunsuffixed-float-constants" # Don't care about these.
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nw="$nw -Wswitch-default" # This warning is actively dangerous.
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nw="$nw -Woverlength-strings" # Who cares about stupid ISO C99 limit.
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gl_MANYWARN_ALL_GCC([ws])
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gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
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for w in $ws; do
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gl_WARN_ADD([$w])
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done
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dnl Normally we disable warnings in $nw above. However $nw only
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dnl filters out exact matching warning strings from a list inside
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dnl gnulib (see m4/manywarnings.m4). So we need to explicitly list a
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dnl few disabled warnings below.
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dnl Unused parameters are not a bug.
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gl_WARN_ADD([-Wno-unused-parameter])
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dnl Missing field initializers is not a bug in C.
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gl_WARN_ADD([-Wno-missing-field-initializers])
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dnl Display the name of the warning option with the warning.
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gl_WARN_ADD([-fdiagnostics-show-option])
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dnl Now some warnings we want to enable and/or customize ...
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dnl Warn about large stack allocations. 10000 happens to be the
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dnl same size as Coverity warns about.
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gl_WARN_ADD([-Wframe-larger-than=10000])
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AC_SUBST([WARN_CFLAGS])
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AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
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AC_DEFINE([GNULIB_PORTCHECK], [1], [Enable some gnulib portability checks.])
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AH_VERBATIM([FORTIFY_SOURCE],[
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/* Enable compile-time and run-time bounds-checking, and some warnings. */
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#if __OPTIMIZE__ && (! defined (_FORTIFY_SOURCE) || _FORTIFY_SOURCE < 2)
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# undef _FORTIFY_SOURCE
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# define _FORTIFY_SOURCE 2
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#endif])
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AC_C_PROTOTYPES
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test "x$U" != "x" && AC_MSG_ERROR([Compiler not ANSI compliant])
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AM_PROG_CC_C_O
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# Provide a global place to set CFLAGS. (Note that setting AM_CFLAGS
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# is no use because it doesn't override target_CFLAGS).
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#---
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# Kill -fstrict-overflow which is a license for the C compiler to make
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# dubious and often unsafe optimizations, in a time-wasting attempt to
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# deal with CPU architectures that do not exist.
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CFLAGS="$CFLAGS -fno-strict-overflow -Wno-strict-overflow"
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dnl Work out how to specify the linker script to the linker.
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VERSION_SCRIPT_FLAGS=-Wl,--version-script=
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`/usr/bin/ld --help 2>&1 | grep -- --version-script >/dev/null` || \
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VERSION_SCRIPT_FLAGS="-Wl,-M -Wl,"
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AC_SUBST(VERSION_SCRIPT_FLAGS)
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dnl Use -fvisibility=hidden by default in the library.
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dnl http://gcc.gnu.org/wiki/Visibility
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AS_IF([test -n "$GCC"],
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[AC_SUBST([GCC_VISIBILITY_HIDDEN], [-fvisibility=hidden])],
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[AC_SUBST([GCC_VISIBILITY_HIDDEN], [:])])
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dnl Check support for 64 bit file offsets.
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AC_SYS_LARGEFILE
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dnl Check sizeof long.
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AC_CHECK_SIZEOF([long])
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dnl Check if __attribute__((cleanup(...))) works.
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dnl XXX It would be nice to use AC_COMPILE_IFELSE here, but gcc just
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dnl emits a warning for attributes that it doesn't understand.
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AC_MSG_CHECKING([if __attribute__((cleanup(...))) works with this compiler])
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AC_RUN_IFELSE([
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AC_LANG_SOURCE([[
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#include <stdio.h>
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#include <stdlib.h>
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void
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freep (void *ptr)
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{
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exit (EXIT_SUCCESS);
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}
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void
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test (void)
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{
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__attribute__((cleanup(freep))) char *ptr = malloc (100);
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}
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int
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main (int argc, char *argv[])
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{
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test ();
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exit (EXIT_FAILURE);
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}
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]])
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE([HAVE_ATTRIBUTE_CLEANUP],[1],[Define to 1 if '__attribute__((cleanup(...)))' works with this compiler.])
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],[
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AC_MSG_WARN(
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['__attribute__((cleanup(...)))' does not work.
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You may not be using a sufficiently recent version of GCC or CLANG, or
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you may be using a C compiler which does not support this attribute,
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or the configure test may be wrong.
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The code will still compile, but is likely to leak memory and other
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resources when it runs.])])
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dnl The C compiler environment.
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m4_include([m4/guestfs_c.m4])
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dnl Check if dirent (readdir) supports d_type member.
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AC_STRUCT_DIRENT_D_TYPE
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@@ -840,15 +681,6 @@ dnl For search paths.
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AC_DEFINE_UNQUOTED([PATH_SEPARATOR],["$PATH_SEPARATOR"],
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[Character that separates path elements in search paths])
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AC_MSG_CHECKING([if we should run the GNUlib tests])
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AC_ARG_ENABLE([gnulib-tests],
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[AS_HELP_STRING([--disable-gnulib-tests],
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[disable running GNU Portability library tests @<:@default=yes@:>@])],
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[ENABLE_GNULIB_TESTS="$enableval"],
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[ENABLE_GNULIB_TESTS=yes])
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AM_CONDITIONAL([ENABLE_GNULIB_TESTS],[test "x$ENABLE_GNULIB_TESTS" = "xyes"])
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AC_MSG_RESULT([$ENABLE_GNULIB_TESTS])
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dnl Library versioning.
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MAX_PROC_NR=`cat $srcdir/src/MAX_PROC_NR`
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AC_SUBST(MAX_PROC_NR)
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189
m4/guestfs_c.m4
Normal file
189
m4/guestfs_c.m4
Normal file
@@ -0,0 +1,189 @@
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# libguestfs
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# Copyright (C) 2009-2015 Red Hat Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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dnl The C compiler environment.
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dnl Define the host CPU architecture (defines 'host_cpu')
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AC_CANONICAL_HOST
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dnl Check for basic C environment.
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AC_PROG_CC_STDC
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AC_PROG_INSTALL
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AC_PROG_CPP
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AC_ARG_ENABLE([werror],
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[AS_HELP_STRING([--enable-werror],
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[turn GCC warnings into errors (for developers)])],
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[case $enableval in
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yes|no) ;;
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*) AC_MSG_ERROR([bad value $enableval for werror option]) ;;
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esac
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gl_gcc_werror=$enableval],
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[gl_gcc_werror=no]
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)
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if test "$gl_gcc_werror" = yes; then
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gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
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AC_SUBST([WERROR_CFLAGS])
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fi
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dnl This, $nw, is the list of warnings we disable.
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nw=
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nw="$nw -Waggregate-return" # anachronistic
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nw="$nw -Wc++-compat" # We don't care about C++ compilers
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nw="$nw -Wundef" # Warns on '#if GNULIB_FOO' etc in gnulib
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||||
nw="$nw -Wtraditional" # Warns on #elif which we use often
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nw="$nw -Wcast-qual" # Too many warnings for now
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nw="$nw -Wconversion" # Too many warnings for now
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nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
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nw="$nw -Wsign-conversion" # Not an error
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nw="$nw -Wtraditional-conversion" # Don't care about pre-ANSI compilers
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nw="$nw -Wpadded" # Our structs are not padded
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nw="$nw -Wvla" # two warnings in mount.c
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dnl things I might fix soon:
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nw="$nw -Wmissing-format-attribute" # daemon.h's asprintf_nowarn
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nw="$nw -Winline" # daemon.h's asprintf_nowarn
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nw="$nw -Wshadow" # numerous, plus we're not unanimous
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nw="$nw -Wunsafe-loop-optimizations" # just a warning that an optimization
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# was not possible, safe to ignore
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nw="$nw -Wpacked" # Allow attribute((packed)) on structs
|
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nw="$nw -Wlong-long" # Allow long long since it's required
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# by Python, Ruby and xstrtoll.
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nw="$nw -Wsuggest-attribute=pure" # Don't suggest pure functions.
|
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nw="$nw -Wsuggest-attribute=const" # Don't suggest const functions.
|
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nw="$nw -Wunsuffixed-float-constants" # Don't care about these.
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nw="$nw -Wswitch-default" # This warning is actively dangerous.
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nw="$nw -Woverlength-strings" # Who cares about stupid ISO C99 limit.
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gl_MANYWARN_ALL_GCC([ws])
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gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
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for w in $ws; do
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gl_WARN_ADD([$w])
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done
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dnl Normally we disable warnings in $nw above. However $nw only
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dnl filters out exact matching warning strings from a list inside
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dnl gnulib (see m4/manywarnings.m4). So we need to explicitly list a
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dnl few disabled warnings below.
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dnl Unused parameters are not a bug.
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gl_WARN_ADD([-Wno-unused-parameter])
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dnl Missing field initializers is not a bug in C.
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gl_WARN_ADD([-Wno-missing-field-initializers])
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dnl Display the name of the warning option with the warning.
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gl_WARN_ADD([-fdiagnostics-show-option])
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dnl Now some warnings we want to enable and/or customize ...
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||||
dnl Warn about large stack allocations. 10000 happens to be the
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dnl same size as Coverity warns about.
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gl_WARN_ADD([-Wframe-larger-than=10000])
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AC_SUBST([WARN_CFLAGS])
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AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
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AC_DEFINE([GNULIB_PORTCHECK], [1], [Enable some gnulib portability checks.])
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AH_VERBATIM([FORTIFY_SOURCE],[
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/* Enable compile-time and run-time bounds-checking, and some warnings. */
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#if __OPTIMIZE__ && (! defined (_FORTIFY_SOURCE) || _FORTIFY_SOURCE < 2)
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# undef _FORTIFY_SOURCE
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# define _FORTIFY_SOURCE 2
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#endif])
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AC_C_PROTOTYPES
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test "x$U" != "x" && AC_MSG_ERROR([Compiler not ANSI compliant])
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AM_PROG_CC_C_O
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||||
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# Provide a global place to set CFLAGS. (Note that setting AM_CFLAGS
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# is no use because it doesn't override target_CFLAGS).
|
||||
#---
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||||
# Kill -fstrict-overflow which is a license for the C compiler to make
|
||||
# dubious and often unsafe optimizations, in a time-wasting attempt to
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||||
# deal with CPU architectures that do not exist.
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||||
CFLAGS="$CFLAGS -fno-strict-overflow -Wno-strict-overflow"
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dnl Work out how to specify the linker script to the linker.
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||||
VERSION_SCRIPT_FLAGS=-Wl,--version-script=
|
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`/usr/bin/ld --help 2>&1 | grep -- --version-script >/dev/null` || \
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VERSION_SCRIPT_FLAGS="-Wl,-M -Wl,"
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AC_SUBST(VERSION_SCRIPT_FLAGS)
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dnl Use -fvisibility=hidden by default in the library.
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dnl http://gcc.gnu.org/wiki/Visibility
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AS_IF([test -n "$GCC"],
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[AC_SUBST([GCC_VISIBILITY_HIDDEN], [-fvisibility=hidden])],
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[AC_SUBST([GCC_VISIBILITY_HIDDEN], [:])])
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dnl Check support for 64 bit file offsets.
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AC_SYS_LARGEFILE
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||||
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dnl Check sizeof long.
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AC_CHECK_SIZEOF([long])
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||||
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dnl Check if __attribute__((cleanup(...))) works.
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||||
dnl XXX It would be nice to use AC_COMPILE_IFELSE here, but gcc just
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||||
dnl emits a warning for attributes that it doesn't understand.
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||||
AC_MSG_CHECKING([if __attribute__((cleanup(...))) works with this compiler])
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AC_RUN_IFELSE([
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AC_LANG_SOURCE([[
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#include <stdio.h>
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#include <stdlib.h>
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void
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freep (void *ptr)
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{
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exit (EXIT_SUCCESS);
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}
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void
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test (void)
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{
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__attribute__((cleanup(freep))) char *ptr = malloc (100);
|
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}
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int
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main (int argc, char *argv[])
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{
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test ();
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exit (EXIT_FAILURE);
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}
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]])
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],[
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AC_MSG_RESULT([yes])
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AC_DEFINE([HAVE_ATTRIBUTE_CLEANUP],[1],[Define to 1 if '__attribute__((cleanup(...)))' works with this compiler.])
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],[
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||||
AC_MSG_WARN(
|
||||
['__attribute__((cleanup(...)))' does not work.
|
||||
|
||||
You may not be using a sufficiently recent version of GCC or CLANG, or
|
||||
you may be using a C compiler which does not support this attribute,
|
||||
or the configure test may be wrong.
|
||||
|
||||
The code will still compile, but is likely to leak memory and other
|
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resources when it runs.])])
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||||
|
||||
dnl Should we run the gnulib tests?
|
||||
AC_MSG_CHECKING([if we should run the GNUlib tests])
|
||||
AC_ARG_ENABLE([gnulib-tests],
|
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[AS_HELP_STRING([--disable-gnulib-tests],
|
||||
[disable running GNU Portability library tests @<:@default=yes@:>@])],
|
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[ENABLE_GNULIB_TESTS="$enableval"],
|
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[ENABLE_GNULIB_TESTS=yes])
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AM_CONDITIONAL([ENABLE_GNULIB_TESTS],[test "x$ENABLE_GNULIB_TESTS" = "xyes"])
|
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AC_MSG_RESULT([$ENABLE_GNULIB_TESTS])
|
||||
Reference in New Issue
Block a user