Make XSLoader's UPSTREAM as undef

[perl5.git] / cflags.SH

diff --git a/cflags.SH b/cflags.SH
index 9e0494e..6420bf3 100755 (executable)
--- a/cflags.SH
+++ b/cflags.SH
@@ -134,7 +134,8 @@ 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
+*)  for opt in -ansi -std=c89 -W -Wextra -Wdeclaration-after-statement \
+               -Wendif-labels -Wc++-compat -Wwrite-strings
     do
        case " $ccflags " in
        *" $opt "*) ;; # Skip if already there.
@@ -213,6 +214,8 @@ warn="$warn"
 stdflags="$stdflags"
 # Extra extra.
 extra="$extra"
+# what do executables look like?
+_exe="$_exe"
 
 !GROK!THIS!
 
@@ -270,97 +273,60 @@ for file do
     : 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) ;;
     *) ;;
+
+    *) : 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
 
-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
-*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 $o" ;;
+    : The examples are intentionally unreachable as the '*)' case always
+    : matches. To use them, move before the '*)' and edit as appropriate.
+    : It is not a good idea to set ccflags to an absolute value here, as it
+    : often contains general -D defines which are needed for correct
+    : compilation. It is better to edit ccflags as shown, using interpolation
+    : to add flags, or sed to remove flags.
+
+
+    case "$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
+      ;;
     esac
-  done
-  ;;
-esac
 
-if test -d .git; then
-  ccflags="-DPERL_PATCHNUM=`git describe` $ccflags"
-else
-  if test -f .patch; then
-    ccflags="-DPERL_PATCHNUM=`awk '{print $4}' .patch` $ccflags"
-  fi
-fi
 
     : Can we perhaps use $ansi2knr here
     echo "$cc -c -DPERL_CORE $ccflags $stdflags $optimize $warn $extra"
@@ -368,6 +334,7 @@ fi
 
     . $TOP/config.sh
 
+    # end per file behaviour
 done
 !NO!SUBS!
 chmod 755 cflags