X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/42a116590b56a49035a440a6b0f3a679f91e9375..6653081c26e47ff513afff9907ee295b58e4ccd8:/cflags.SH

diff --git a/cflags.SH b/cflags.SH
index 5a6a706..a5d71b9 100755
--- a/cflags.SH
+++ b/cflags.SH
@@ -16,6 +16,188 @@ esac
 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 = t0a == t0b;
+
+/* 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.
+
+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
+    do
+       case " $ccflags " in
+       *" $opt "*) ;; # Skip if already there.
+       *) rm -f _cflags$_exe
+          case "`$cc $cflags $warn $stdflags $opt _cflags.c -o _cflags$_exe 2>&1`" in
+          *"unrecognized"*) ;;
+          *"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 $opt" ;;
+               esac
+             fi
+             ;;
+          esac
+          ;;
+       esac
+    done
+    ;;
+esac
+rm -f _cflags.c _cflags$_exe
+
+case "$gccversion" in
+'') ;;
+*)
+  if [ "$gccansipedantic" = "" ]; then
+    # 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.
+    case "$quadtype:$sPRId64" in
+    "long long"*|*lld*|*Ld*)
+      ccflags="`echo $ccflags|sed 's/-pedantic/ /'`"
+      warn="`echo $warn|sed 's/-pedantic/ /'`"
+      ;;
+    esac
+    # Similarly, since 'long long' isn't part of C89, FreeBSD 6.2 headers
+    # don't declare atoll() under -std=c89, but we need it.  In general,
+    # insisting on -std=c89 is inconsistent with insisting on using
+    # 'long long'. So drop -std=c89 and -ansi as well if we're using 
+    # 'long long' as our main integral type.
+    case "$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 $stdflags|sed -e 's/-std=c89/ /'`
+	;;
+    esac
+  fi
+  # Using certain features (like the gcc statement expressions)
+  # requires knowing whether -pedantic has been specified.
+  case "$warn$ccflags" in
+  *-pedantic*) warn="$warn -DPERL_GCC_PEDANTIC" ;;
+  esac
+  ;;
+esac
+
+# 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!.
@@ -24,6 +206,16 @@ echo "Extracting cflags (with variable substitutions)"
 rm -f cflags
 $spitshell >cflags <<!GROK!THIS!
 $startsh
+
+# Extra warnings, used e.g. for gcc.
+warn="$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.
@@ -93,15 +285,19 @@ for file do
     doio) ;;
     doop) ;;
     dump) ;;
+    globals) ;;
     gv) ;;
     hv) ;;
     locale) ;;
+    madly) ;;
     main) ;;
     malloc) ;;
     mg) ;;
     miniperlmain) ;;
     numeric) ;;
     op) ;;
+    opmini) ;;
+    pad) ;;
     perl) ;;
     perlapi) ;;
     perlmain) ;;
@@ -110,6 +306,7 @@ for file do
     pp_ctl) ;;
     pp_hot) ;;
     pp_pack) ;;
+    pp_sort) ;;
     pp_sys) ;;
     regcomp) ;;
     regexec) ;;
@@ -118,59 +315,54 @@ for file do
     sv) ;;
     taint) ;;
     toke) ;;
+    universal) ;;
     usersub) ;;
+    utf8) ;;
     util) ;;
     *) ;;
     esac
 
-# Add -Wall for the core modules iff gcc and not already -Wall
-warn=''
-case "$gccversion" in
-'') ;;
-Intel*) ;;
-*)  case "$ccflags" in
-    *-Wall*) ;;
-    *) warn="$warn -Wall" ;;
+    case "$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 "$gccansipedantic" in
-    define)
-	case "$gccversion" in
-	[12]*) ;; # gcc versions 1 (gasp!) and 2 are not good for this.
-	*)  case "$osname" in
-	    # Add -ansi -pedantic only for known platforms.
-	    aix|dec_osf|freebsd|hpux|irix|linux)
-		ansipedantic="-ansi -pedantic" ;;
-	    solaris)
-# Can't add -ansi for Solaris.
-# Off_t/off_t is a struct in Solaris with largefiles, and with -ansi
-# that struct cannot be compared with a flat integer, such as a STRLEN.
-# The -ansi will also cause a lot of noise in Solaris because of:
-# /usr/include/sys/resource.h:148: warning: `struct rlimit64' declared inside parameter list
-		ansipedantic="-pedantic" ;;
-	    esac
-	    for i in $ansipedantic
-	    do
-		case "$ccflags" in
-		*$i*) ;;
-		*) warn="$warn $i" ;;
-		esac
-	    done
-	    case "$warn$ccflags" in
-	    *-pedantic*) warn="$warn -DPERL_GCC_PEDANTIC" ;;
-	    esac
-	    ;;
-	esac
-	;;
+    cppflags=`echo $cppflags|sed 's/-Wdeclaration-after-statement/ /'`
+
+    case "$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" ;;
+        esac
+      done
+      ;;
     esac
-    ;;
-esac
+
 
     : Can we perhaps use $ansi2knr here
-    echo "$cc -c -DPERL_CORE $ccflags $optimize $warn"
-    eval "$also "'"$cc -DPERL_CORE -c $ccflags $optimize $warn"'
+    echo "$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