+#!/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=.;
. $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.
+# 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 && ! test -f config.h; then
+if test -f config_h.SH -a ! -f config.h; then
. ./config_h.SH
CONFIG_H=already-done
fi
#ifdef I_UNISTD
#include <unistd.h>
#endif
-#ifdef I_SYSTYPES
+#ifdef I_SYS_TYPES
#include <sys/types.h>
#endif
-#ifdef I_SYSPARAM
+#ifdef I_SYS_PARAM
#include <sys/param.h>
#endif
-#ifdef I_SYSRESOURCE
+#ifdef I_SYS_RESOURCE
#include <sys/resource.h>
#endif
-#ifdef I_SYSSELECT
+#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_SYSSTAT
+#ifdef I_SYS_STAT
#include <sys/stat.h>
#endif
-#ifdef I_SYSTIME
+#ifdef I_SYS_TIME
#include <sys/time.h>
#endif
-#ifdef I_SYSTIMES
+#ifdef I_SYS_TIMES
#include <sys/times.h>
#endif
-#ifdef I_SYSWAIT
+#ifdef I_SYS_WAIT
#include <sys/wait.h>
#endif
/* The gcc -ansi can cause a lot of noise in Solaris because of:
* 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 = t0a == t0b;
- return 0;
+/* 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.
+# 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.
+
case "$gccversion" in
'') ;;
[12]*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
Intel*) ;; # # Is that you, Intel C++?
-*) for opt in -ansi -pedantic -std=c89 -W -Wextra -Wdeclaration-after-statement -Wendif-labels -Wc++-compat
+# XXX if -pedantic (or -pedantic-errors!) is ever added,
+# the -Werror=declaration-after-statement can be removed
+# since -std=c89 -pedantic implies the -Werror=...
+*) for opt in -ansi -std=c89 -W -Wextra \
+ -Werror=declaration-after-statement \
+ -Wc++-compat -Wwrite-strings
do
case " $ccflags " in
*" $opt "*) ;; # Skip if already there.
*) rm -f _cflags$_exe
- case "`$cc $cflags $opt _cflags.c -o _cflags$_exe 2>&1`" in
+ case "`$cc -DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt _cflags.c -o _cflags$_exe 2>&1`" in
*"unrecognized"*) ;;
+ *"unknown"*) ;;
+ *"implicit declaration"*) ;; # Was something useful hidden?
*"Invalid"*) ;;
*"is valid for C"*) ;;
*) if test -x _cflags$_exe
# become warn-worthy. So let's drop the -pedantic in that case.
case "$quadtype:$sPRId64" in
"long long"*|*lld*|*Ld*)
+ echo "cflags.SH: Removing -pedantic and warn because of quadtype='long long'."
ccflags="`echo $ccflags|sed 's/-pedantic/ /'`"
warn="`echo $warn|sed 's/-pedantic/ /'`"
;;
esac
+ # Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
+ # don't declare atoll() under -std=c89, but we need it. In general,
+ # insisting on -std=c89 is inconsistent with insisting on using
+ # 'long long'. So drop -std=c89 and -ansi as well if we're using
+ # 'long long' as our main integral type.
+ case "$ivtype" in
+ "long long")
+ echo "cflags.SH: Removing -pedantic, -std=c89, and -ansi because of ivtype='long long'."
+ ccflags=`echo $ccflags|sed -e 's/-pedantic/ /' -e 's/-std=c89/ /' -e 's/-ansi/ /'`
+ warn=`echo $warn|sed -e 's/-pedantic/ /' -e 's/-ansi/ /'`
+ stdflags=`echo $stdflags|sed -e 's/-std=c89/ /'`
+ ;;
+ esac
fi
# Using certain features (like the gcc statement expressions)
# requires knowing whether -pedantic has been specified.
case "$warn$ccflags" in
- *-pedantic*) warn="$warn -DPERL_GCC_PEDANTIC" ;;
+ *-pedantic*)
+ echo "cflags.SH: Adding -DPERL_PEDANTIC because of -pedantic."
+ warn="$warn -DPERL_GCC_PEDANTIC"
+ ;;
esac
;;
esac
+case "$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 \
+ -std=c89
+ do
+ case "$ccflags" in
+ *"$f"*)
+ echo "cflags.SH: Removing $ccflags because of g++."
+ ccflags=`echo $ccflags|sed 's/$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
+
# 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.
+# 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.
+# In the following dollars and backticks do not need the extra backslash.
$spitshell >>cflags <<'!NO!SUBS!'
case $PERL_CONFIG_SH in
'')
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 compiler command line for file
+# 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=*")
;;
esac
-also=': '
-case $# in
-1) also='echo 1>&2 " CCCMD = "'
-esac
-
case $# in
0) set *.c; echo "The current C flags are:" ;;
esac
*) echo $n " $file.c $c" ;;
esac
- : allow variables like toke_cflags to be evaluated
+ # allow variables like toke_cflags to be evaluated
if echo $file | grep -v / >/dev/null
then
eval 'eval ${'"${file}_cflags"'-""}'
fi
- : or customize here
+ # or customize here
case "$file" in
- DB_File) ;;
- GDBM_File) ;;
- NDBM_File) ;;
- ODBM_File) ;;
- POSIX) ;;
- SDBM_File) ;;
- av) ;;
- byterun) ;;
- deb) ;;
- dl) ;;
- doio) ;;
- doop) ;;
- dump) ;;
- globals) ;;
- gv) ;;
- hv) ;;
- locale) ;;
- madly) ;;
- main) ;;
- malloc) ;;
- mg) ;;
- miniperlmain) ;;
- numeric) ;;
- op) ;;
- opmini) ;;
- pad) ;;
- perl) ;;
- perlapi) ;;
- perlmain) ;;
- perly) ;;
- pp) ;;
- pp_ctl) ;;
- pp_hot) ;;
- pp_pack) ;;
- pp_sort) ;;
- pp_sys) ;;
- regcomp) ;;
- regexec) ;;
- run) ;;
- scope) ;;
- sv) ;;
- taint) ;;
- toke) ;;
- universal) ;;
- usersub) ;;
- utf8) ;;
- util) ;;
- xsutils) ;;
*) ;;
- esac
-
-case "$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.
- for f in -Wdeclaration-after-statement -std=c89
- do
- ccflags=`echo $ccflags|sed 's/$f/ /'`
- done
- ;;
-esac
-case "$cc" in
-*g++*)
- # Without -Wno-unused-variable g++ 4.x compiles are rather unwatchable
- # because of all the warnings about Perl___notused, and g++ doesn't do
- # __attribute__((unused)) (and even if at some stage it may, people do
- # have older gcc installations), and ((void)x) isn't enough to silence
- # the noises about XS functions not using their cv parameter, so we need
- # the -Wno-unused-parameter too.
- # Yes, we lose some valid warnings, but hopefully other compilers
- # (like gcc) will still pick up those warnings.
- for o in -Wno-unused-variable -Wno-unused-parameter
- do
- case "$warn" in
- *$o*) ;;
- *) warn="$warn $o" ;;
+ # 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
- done
- ;;
-esac
-
-if test -f .patch; then
- ccflags="-DPERL_PATCHNUM=`cat .patch` $ccflags"
-fi
- : Can we perhaps use $ansi2knr here
+ # Can we perhaps use $ansi2knr here
echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
- eval "$also "'"$cc -DPERL_CORE -c $ccflags $stdflags $optimize $warn $extra"'
. $TOP/config.sh
+ # end per file behaviour
done
!NO!SUBS!
chmod 755 cflags
https://perl5.git.perl.org / perl5.git / blobdiff