+
+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
+ ;;
+ -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 $opt2" ;;
+ esac
+ done
+ ;;
+ esac
+ done
+ ;;
+esac
+rm -f _cflags.c _cflags$_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
+
+# 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"`
+