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#!/bin/sh
# Generate the cflags script, which is used to determine what cflags
# to pass to the compiler for compiling the core perl.
#
# This does NOT affect the XS compilation (ext, dist, cpan)
# since that uses %Config values directly.
#
# For example, since -Wall adds -Wunused-*, a bare -Wall (without
# amending that with -Wno-unused-..., or with the PERL_UNUSED_...)
# would be too much for XS code because there are too many generated
# but often unused things.
#
# We create a temporary test C program and repeatedly compile it with
# various candidate flags, and from the compiler output, determine what
# flags are supported.
#
# From this we initialise the following variables in the cflags script:
#
# $myccflags (possibly edited version of $Config{ccflags})
# $warn
# $stdflags
# $extra
# $_exe
case $PERL_CONFIG_SH in
'')
if test -f config.sh; then TOP=.;
elif test -f ../config.sh; then TOP=..;
elif test -f ../../config.sh; then TOP=../..;
elif test -f ../../../config.sh; then TOP=../../..;
elif test -f ../../../../config.sh; then TOP=../../../..;
else
echo "Can't find config.sh."; exit 1
fi
. $TOP/config.sh
;;
esac
# This forces SH files to create target in same directory as SH file.
# This is so that make depend always knows where to find SH derivatives.
case "$0" in
*/*) cd `expr X$0 : 'X\(.*\)/'` ;;
esac
if test -f config_h.SH -a ! -f config.h; then
. ./config_h.SH
CONFIG_H=already-done
fi
warn=''
# Add -Wall for the core modules iff gcc and not already -Wall
case "$gccversion" in
'') ;;
Intel*) ;; # The Intel C++ plays gcc on TV but is not really it.
*) case "$ccflags" in
*-Wall*) ;;
*) warn="$warn -Wall" ;;
esac
;;
esac
# Create a test source file for testing what options can be fed to
# gcc in this system; include a selection of most common and commonly
# hairy include files.
cat >_cflags.c <<__EOT__
#include "EXTERN.h"
#include "perl.h"
/* The stdio.h, errno.h, and setjmp.h should be there in any ANSI C89. */
#include <stdio.h>
#include <errno.h>
#include <setjmp.h>
/* Just in case the inclusion of perl.h did not
* pull in enough system headers, let's try again. */
#ifdef I_STDLIB
#include <stdlib.h>
#endif
#ifdef I_STDDEF
#include <stddef.h>
#endif
#ifdef I_STDARG
#include <stdarg.h>
#endif
#ifdef I_LIMITS
#include <limits.h>
#endif
#ifdef I_DIRENT
#include <dirent.h>
#endif
#ifdef I_UNISTD
#include <unistd.h>
#endif
#ifdef I_SYS_TYPES
#include <sys/types.h>
#endif
#ifdef I_SYS_PARAM
#include <sys/param.h>
#endif
#ifdef I_SYS_RESOURCE
#include <sys/resource.h>
#endif
#ifdef I_SYS_SELECT
#include <sys/select.h>
#endif
#if defined(HAS_SOCKET) && !defined(VMS) && !defined(WIN32) /* See perl.h. */
#include <sys/socket.h>
#endif
#ifdef I_SYS_STAT
#include <sys/stat.h>
#endif
#ifdef I_SYS_TIME
#include <sys/time.h>
#endif
#ifdef I_SYS_TIMES
#include <sys/times.h>
#endif
#ifdef I_SYS_WAIT
#include <sys/wait.h>
#endif
/* The gcc -ansi can cause a lot of noise in Solaris because of:
/usr/include/sys/resource.h:148: warning: 'struct rlimit64' declared inside parameter list
*/
int main(int argc, char *argv[]) {
/* Add here test code found to be problematic in some gcc platform. */
/* Off_t/off_t is a struct in Solaris with largefiles, and with gcc -ansi
* that struct cannot be compared in some gcc releases with a flat
* integer, such as a STRLEN. */
IV iv;
Off_t t0a = 2;
STRLEN t0b = 3;
int t0c = (STRLEN)t0a == t0b;
printf("%s: %d\n", argv[0], argc);
/* In FreeBSD 6.2 (and probably other releases too), with -Duse64bitint,
perl will use atoll(3). However, that declaration is hidden in <stdlib.h>
if we force the compiler to use -std=c89 mode.
*/
iv = Atol("42");
return (!t0c && (iv == 42)) ? 0 : -1; /* Try to avoid 'unused' warnings. */
}
__EOT__
stdflags=''
# Further gcc warning options. Build up a list of options that work.
# Note that some problems may only show up with combinations of options,
# e.g. a warning might show up only with -Wall -ansi, not with either
# one individually.
# TODO: Ponder whether to migrate this back to Configure so hints files can
# tweak it. Also, be paranoid about whether results we've deduced in Configure
# (especially about things like long long, which are not in C89) will still be
# valid if we now add flags like -std=c89.
pedantic=''
case "$gccansipedantic" in
define) pedantic='-pedantic' ;;
esac
case "$gccversion" in
'') ;;
[12]*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
Intel*) ;; # # Is that you, Intel C++?
#
# NOTE 1: the -std=c89 without -pedantic is a bit pointless.
# Just -std=c89 means "if there is room for interpretation,
# interpret the C89 way." It does NOT mean "strict C89" on its own.
# You need to add the -pedantic for that. To do this with Configure,
# do -Dgccansipedantic (note that the -ansi is included in any case,
# the option is a bit oddly named, for historical reasons.)
#
# NOTE 2: -pedantic necessitates adding a couple of flags:
# * -PERL_GCC_PEDANTIC so that the perl code can adapt: there's nothing
# added by gcc itself to indicate pedanticness.
# * -Wno-overlength-strings under -DDEBUGGING because quite many of
# the LEAVE_with_name() and assert() calls generate string literals
# longer then the ANSI minimum of 509 bytes.
#
# NOTE 3: the relative order of these options matters:
# -Wextra before -W
# -std=c89 before -ansi
# -pedantic* before -Werror=d-a-s
#
*) for opt in -std=c89 -ansi $pedantic \
-Werror=declaration-after-statement \
-Wextra -W \
-Wc++-compat -Wwrite-strings
do
case " $ccflags " in
*" $opt "*) ;; # Skip if already there.
*) rm -f _cflags$_exe
flags="-DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt"
case "$opt" in
*-pedantic*) flags="$flags -DPERL_GCC_PEDANTIC" ;;
esac
# echo "opt = $opt, flags = $flags"
cmd="$cc $flags _cflags.c -o _cflags$_exe"
out="`$cmd 2>&1`"
# echo "$cmd --> $out"
case "$out" in
*"unrecognized"*) ;;
*"unknown"*) ;;
*"implicit declaration"*) ;; # Was something useful hidden?
*"Invalid"*) ;;
*"is valid for C"*) ;;
*) if test -x _cflags$_exe
then
case "$opt" in
-std*)
echo "cflags.SH: Adding $opt."
stdflags="$stdflags $opt"
;;
-ansi)
# -std=c89 is the modern form of -ansi, so add
# -ansi only if -std=c89 is not there already.
case " $stdflags " in
*-std=c89*) ;;
*)
echo "cflags.SH: Adding $opt."
stdflags="$stdflags $opt"
;;
esac
;;
*) case "$opt" in
-W)
# -Wextra is the modern form of -W, so add
# -W only if -Wextra is not there already.
case " $warn " in
*-Wextra*) ;;
*)
echo "cflags.SH: Adding $opt."
warn="$warn $opt"
;;
esac
;;
-Werror=declaration-after-statement)
# -pedantic* (with -std=c89) covers -Werror=d-a-s.
case "$stdflags$warn" in
*-std=c89*-pedantic*|*-pedantic*-std=c89*) ;;
*)
echo "cflags.SH: Adding $opt."
warn="$warn $opt"
;;
esac
;;
*)
echo "cflags.SH: Adding $opt."
warn="$warn $opt"
;;
esac
esac
fi
;;
esac
;;
esac
case "$ccflags$warn" in
*-pedantic*)
overlength=''
case "$ccflags$optimize" in
*-DDEBUGGING*) overlength='-Wno-overlength-strings' ;;
esac
for opt2 in -DPERL_GCC_PEDANTIC $overlength
do
case "$ccflags$warn" in
*"$opt2"*) ;;
*) echo "cflags.SH: Adding $opt2 because of -pedantic."
warn="$warn $opt2" ;;
esac
done
;;
esac
done
;;
esac
rm -f _cflags.c _cflags$_exe
case "$gccversion" in
'') ;;
*)
case "$warn$ccflags" in
*-pedantic*)
# If we have -Duse64bitint (or equivalent) in effect and the quadtype
# has become 'long long', gcc -pedantic* becomes unbearable
# (moreso when combined with -Wall) because long long and LL and %lld|%Ld
# become warn-worthy. So let's drop the -pedantic in that case.
#
# Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
# don't declare atoll() under -std=c89, but we need it. In general,
# insisting on -std=c89 is inconsistent with insisting on using
# 'long long'. So drop -std=c89 and -ansi as well if we're using
# 'long long' as our main integral type.
#
# usedtrace (DTrace) uses unportable features (dollars in identifiers,
# and gcc statement expressions), it is just easier to turn off pedantic.
remove=''
case "$quadtype:$ivtype:$sPRId64:$usedtrace" in
*"long long"*|*lld*|*Ld*) remove='long long' ;;
*) case "$usedtrace" in
define) remove='usedtrace' ;;
esac
;;
esac
case "$remove" in
'') ;;
*) echo "cflags.SH: Removing -pedantic*, -std=c89, and -ansi because of $remove."
ccflags=`echo $ccflags|sed -e 's/-pedantic-errors/ /' -e 's/-pedantic/ /' -e 's/-std=c89/ /' -e 's/-ansi/ /' -e 's/-DPERL_GCC_PEDANTIC/ /'`
warn=`echo $warn|sed -e 's/-pedantic-errors/ /' -e 's/-pedantic/ /' -e 's/-ansi/ /' -e 's/-DPERL_GCC_PEDANTIC/ /'`
stdflags=`echo $stdflags|sed -e 's/-std=c89/ /'`
;;
esac
;;
esac
;;
esac
# Older clang releases are not wise enough for -Wunused-value.
case "$gccversion" in
*"Apple LLVM "[34]*|*"Apple LLVM version "[34]*)
for f in -Wno-unused-value
do
echo "cflags.SH: Adding $f because clang version '$gccversion'"
warn="$warn $f"
done
;;
esac
# The quadmath Q format specifier will cause -Wformat to whine.
case "$gccversion" in
'') ;;
*) case "$usequadmath" in
define)
for f in -Wno-format
do
echo "cflags.SH: Adding $f because of usequadmath."
warn="$warn $f"
done
;;
esac
;;
esac
case "$cc" in
*g++*)
# Extra paranoia in case people have bad canned ccflags:
# bad in the sense that the flags are accepted by g++,
# but then whined about.
#
# -Werror=d-a-s option is valid for g++, by definition,
# but we remove it just for cleanliness and shorter command lines.
for f in -Wdeclaration-after-statement \
-Werror=declaration-after-statement \
-Wc++-compat \
-std=c89
do
case "$ccflags$warn" in
*"$f"*)
echo "cflags.SH: Removing $f because of g++."
ccflags=`echo $ccflags|sed 's/$f/ /'`
warn=`echo $warn|sed 's/$f/ /'`
;;
esac
done
;;
esac
for f in -Wdeclaration-after-statement -Werror=declaration-after-statement
do
case "$cppflags" in
*"$f"*)
echo "cflags.SH: Removing $f from cppflags."
cppflags=`echo $cppflags|sed 's/$f/ /'` ;;
esac
done
echo "cflags.SH: cc = $cc"
echo "cflags.SH: ccflags = $ccflags"
echo "cflags.SH: stdflags = $stdflags"
echo "cflags.SH: optimize = $optimize"
echo "cflags.SH: warn = $warn"
# Code to set any extra flags here.
extra=''
echo "Extracting cflags (with variable substitutions)"
# This section of the file will have variable substitutions done on it.
# Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
# Protect any dollar signs and backticks that you do not want interpreted
# by putting a backslash in front. You may delete these comments.
rm -f cflags
$spitshell >cflags <<!GROK!THIS!
$startsh
# !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
# This file is generated by cflags.SH
# Used to restore possible edits by cflags.SH.
myccflags="$ccflags"
# Extra warnings, used e.g. for gcc.
warn="$warn"
# Extra standardness.
stdflags="$stdflags"
# Extra extra.
extra="$extra"
# what do executables look like?
_exe="$_exe"
!GROK!THIS!
# In the following dollars and backticks do not need the extra backslash.
$spitshell >>cflags <<'!NO!SUBS!'
case $PERL_CONFIG_SH in
'')
if test -f config.sh; then TOP=.;
elif test -f ../config.sh; then TOP=..;
elif test -f ../../config.sh; then TOP=../..;
elif test -f ../../../config.sh; then TOP=../../..;
elif test -f ../../../../config.sh; then TOP=../../../..;
else
echo "Can't find config.sh."; exit 1
fi
. $TOP/config.sh
ccflags="$myccflags" # Restore possible edits by cflags.SH.
;;
esac
# syntax: cflags [optimize=XXX] [file[.suffix]] ...
# displays the proposed compiler command line for each 'file'
#
# with no file, dispalys it for all *.c files.
# The optimise=XXX arg (if present) is evalled, setting the default
# value of the $optimise variable, which is output on the command line
# (but which may be overridden for specific files below)
case "X$1" in
Xoptimize=*|X"optimize=*")
eval "$1"
shift
;;
esac
case $# in
0) set *.c; echo "The current C flags are:" ;;
esac
set `echo "$* " | sed -e 's/\.[oc] / /g' -e 's/\.obj / /g' -e "s/\\$obj_ext / /g"`
for file do
case "$#" in
1) ;;
*) echo $n " $file.c $c" ;;
esac
# allow variables like toke_cflags to be evaluated
if echo $file | grep -v / >/dev/null
then
eval 'eval ${'"${file}_cflags"'-""}'
fi
# or customize here
case "$file" in
regcomp) : work around http://bugs.debian.org/754054
case $archname in
mips-*|mipsel-*)
optimize="$optimize -fno-tree-vrp";;
esac;;
*) ;;
# Customization examples follow.
#
# The examples are intentionally unreachable as the '*)' case above always
# matches. To use them, move before the '*)' and edit as appropriate.
# It is not a good idea to set ccflags to an absolute value here, as it
# often contains general -D defines which are needed for correct
# compilation. It is better to edit ccflags as shown, using interpolation
# to add flags, or sed to remove flags.
av) ccflags=`echo $ccflags | sed -e s/-pipe//` ;;
deb) ccflags="$ccflags -fno-jump-tables" ;;
hv) warn=`echo $warn | sed -e s/-Wextra//` ;;
toke) optimize=-O0 ;;
esac
# Can we perhaps use $ansi2knr here
echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
. $TOP/config.sh
# end per file behaviour
done
!NO!SUBS!
chmod 755 cflags
$eunicefix cflags
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