#!/bin/sh
# Generate the cflags script, which is used to determine what cflags
-# to pass to the compiler.
-# We create a temporary test c program and repeatedly compile it with
+# 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
# $extra
IV iv;
Off_t t0a = 2;
STRLEN t0b = 3;
- int t0c = t0a == t0b;
+ int t0c = (STRLEN)t0a == t0b;
+
+ printf("%s: %d\n", argv[0], argc);
/* In FreeBSD 6.2 (and probably other releases too), with -Duse64bitint,
perl will use atoll(3). However, that declaration is hidden in <stdlib.h>
# Note that some problems may only show up with combinations of options,
# e.g. a warning might show up only with -Wall -ansi, not with either
# one individually.
-# TODO: Ponder whether to migrate this back to Configure so hints files can
+# TODO: Ponder whether to migrate this back to Configure so hints files can
# tweak it. Also, be paranoid about whether results we've deduced in Configure
-# (especially about things like long long, which are not in C89) will still be
+# (especially about things like long long, which are not in C89) will still be
# valid if we now add flags like -std=c89.
+pedantic=''
+case "$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++?
-*) for opt in -ansi -std=c89 -W -Wextra -Wdeclaration-after-statement \
- -Wendif-labels -Wc++-compat -Wwrite-strings
+#
+# 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
- case "`$cc -DPERL_NO_INLINE_FUNCTIONS $ccflags $warn $stdflags $opt _cflags.c -o _cflags$_exe 2>&1`" in
+ 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*) stdflags="$stdflags $opt" ;;
- *) warn="$warn $opt" ;;
+ -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
+ ;;
+ -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 $opt"
+ ;;
esac
fi
;;
esac
;;
esac
+ case "$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 $opt2" ;;
+ esac
+ done
+ ;;
+ esac
done
;;
esac
case "$gccversion" in
'') ;;
*)
- if [ "$gccansipedantic" = "" ]; then
+ case "$warn$ccflags" in
+ *-pedantic*)
# If we have -Duse64bitint (or equivalent) in effect and the quadtype
- # has become 'long long', gcc -pedantic becomes unbearable (moreso
- # when combined with -Wall) because long long and LL and %lld|%Ld
+ # has become 'long long', gcc -pedantic* becomes unbearable
+ # (moreso when combined with -Wall) because long long and LL and %lld|%Ld
# become warn-worthy. So let's drop the -pedantic in that case.
- case "$quadtype:$sPRId64" in
- "long long"*|*lld*|*Ld*)
- ccflags="`echo $ccflags|sed 's/-pedantic/ /'`"
- warn="`echo $warn|sed 's/-pedantic/ /'`"
- ;;
- esac
+ #
# Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
# don't declare atoll() under -std=c89, but we need it. In general,
# insisting on -std=c89 is inconsistent with insisting on using
- # 'long long'. So drop -std=c89 and -ansi as well if we're using
+ # 'long long'. So drop -std=c89 and -ansi as well if we're using
# 'long long' as our main integral type.
- case "$ivtype" in
- "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 $stdflags|sed -e 's/-std=c89/ /'`
- ;;
+ #
+ # usedtrace (DTrace) uses unportable features (dollars in identifiers,
+ # and gcc statement expressions), it is just easier to turn off pedantic.
+ remove=''
+ case "$quadtype:$ivtype:$sPRId64:$usedtrace" in
+ *"long long"*|*lld*|*Ld*) remove='long long' ;;
+ *) case "$usedtrace" in
+ define) remove='usedtrace' ;;
+ esac
+ ;;
esac
- fi
- # Using certain features (like the gcc statement expressions)
- # requires knowing whether -pedantic has been specified.
- case "$warn$ccflags" in
- *-pedantic*) warn="$warn -DPERL_GCC_PEDANTIC" ;;
+ case "$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
+
+# If usethreads and clang, add -Wthread-safety for clang 3.6 or later.
+# gccversion is defined also for clang, because compat, use that for matching.
+# Apple overwrites clang version with XCode version, see hints/darwin.sh
+# for the gory details. Aggressively forward-proofing.
+case "$usethreads" in
+define)
+case "$gccversion" in
+*" Clang 3."[56789]*|*" Clang "[456]*|*"Apple LLVM 6.1"*|*"Apple LLVM "[789]*)
+ for f in -Wthread-safety
+ do
+ case " $warn " in
+ *" $f "*) ;; # Skip if already there.
+ *)
+ echo "cflags.SH: Adding $f because usethreads and clang and gccversion '$gccversion'"
+ warn="$warn $f"
+ ;;
+ esac
+ done
+;;
+esac
+;;
+esac
+
+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=''
+# Protect double or single quotes for better restoring of ccflags.
+myccflags=`echo $ccflags | sed -e 's/"/\\\"/g' -e "s/'/\\\'/g"`
+
echo "Extracting cflags (with variable substitutions)"
# This section of the file will have variable substitutions done on it.
# Move anything that needs config subs from !NO!SUBS! section to !GROK!THIS!.
# This file is generated by cflags.SH
+# Used to restore possible edits by cflags.SH.
+myccflags="$myccflags"
# Extra warnings, used e.g. for gcc.
warn="$warn"
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
# allow variables like toke_cflags to be evaluated
- if echo $file | grep -v / >/dev/null
- then
- eval 'eval ${'"${file}_cflags"'-""}'
- fi
+ case "$file" in
+ */*) ;;
+ *) eval 'eval ${'"${file}_cflags"'-""}' ;;
+ esac
# 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:
- av) ccflags=`echo $ccflags | sed -e s/-pipe//` ;;
- deb) ccflags="$ccflags -fno-jump-tables" ;;
- hv) warn=`echo $warn | sed -e s/-Wextra//` ;;
- toke) optimize=-O0 ;;
- esac
-
- # The examples are intentionally unreachable as the '*)' case always
+ # Customization examples follow.
+ #
+ # The examples are intentionally unreachable as the '*)' case above always
# matches. To use them, move before the '*)' and edit as appropriate.
# It is not a good idea to set ccflags to an absolute value here, as it
# often contains general -D defines which are needed for correct
# compilation. It is better to edit ccflags as shown, using interpolation
# to add flags, or sed to remove flags.
-
- case "$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
- cppflags=`echo $cppflags|sed 's/-Wdeclaration-after-statement/ /'`
-
- case "$cc" in
- *clang*)
- # clang complains a lot about -Wunused-value which are not fixable
- warn="$warn -Wno-unused-value"
- ;;
- *g++*)
- # Without -Wno-unused-variable g++ 4.x compiles are rather unwatchable
- # because of all the warnings about Perl___notused, and g++ doesn't do
- # __attribute__((unused)) (and even if at some stage it may, people do
- # have older gcc installations), and ((void)x) isn't enough to silence
- # the noises about XS functions not using their cv parameter, so we need
- # the -Wno-unused-parameter too.
- # Yes, we lose some valid warnings, but hopefully other compilers
- # (like gcc) will still pick up those warnings.
- for o in -Wno-unused-variable -Wno-unused-parameter
- do
- case "$warn" in
- *$o*) ;;
- *) warn="$warn $o" ;;
- esac
- done
- ;;
- *)
- # clang may not be called clang
- case "`$cc -v 2>&1`" in
- *clang*)
- case "$warn" in
- *-Wno-unused-value) ;;
- *) warn="$warn -Wno-unused-value"
- esac
- esac
+ 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 $extra"
- eval "$also "'"$cc -DPERL_CORE -c $ccflags $stdflags $optimize $warn $extra"'
. $TOP/config.sh
https://perl5.git.perl.org / perl5.git / blobdiff