gnu: gcc: Fix manual pages.

Fixes bug #24069. perl is made a native input to all of the gcc-* packages
except for gcc-boot0; perl-boot0 is made a native input to gcc-final.

* gnu/packages/patches/gcc-fix-texi2pod.patch: Add patch file to fix texi2pod.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/gcc.scm (gcc-4.7, gcc-4.8, gcc-4.9, gcc-5): Use it.
(gcc-4.7)[native-inputs]: Add perl.
(gcc-4.9)[native-inputs]: Likewise.
* gnu/packages/commencement.scm (gcc-boot0)[native-inputs]: Remove perl.
(gcc-final)[native-inputs]: Add perl-boot0.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/local.mk

@@ -625,6 +625,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gcc-arm-link-spec-fix.patch		\
   %D%/packages/patches/gcc-asan-powerpc-missing-include.patch	\
   %D%/packages/patches/gcc-cross-environment-variables.patch	\
+  %D%/packages/patches/gcc-fix-texi2pod.patch			\
   %D%/packages/patches/gcc-libvtv-runpath.patch			\
   %D%/packages/patches/gcc-strmov-store-file-names.patch	\
   %D%/packages/patches/gcc-4.6-gnu-inline.patch			\

gnu/packages/commencement.scm

@@ -286,9 +286,8 @@
                ("libc-native" ,@(assoc-ref %boot0-inputs "libc"))
                ,@(alist-delete "libc" %boot0-inputs)))
 
-     ;; No need for Texinfo at this stage.
-     (native-inputs (alist-delete "texinfo"
-                                  (package-native-inputs gcc))))))
+     ;; No need for the native-inputs to build the documentation at this stage.
+     (native-inputs `()))))
 
 (define perl-boot0
   (let ((perl (package
@@ -792,6 +791,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
     ;; scripts such as 'mkheaders' and 'fixinc.sh' (XXX: who cares about these
     ;; scripts?).
     (native-inputs `(("texinfo" ,texinfo-boot0)
+                     ("perl" ,perl-boot0) ;for manpages
                      ("static-bash" ,static-bash-for-glibc)
                      ,@(package-native-inputs gcc-boot0)))
 

gnu/packages/gcc.scm

@@ -138,7 +138,8 @@ where the OS part is overloaded to denote a specific ABI---into GCC
                                    version "/gcc-" version ".tar.bz2"))
                (sha256
                 (base32
-                 "10k2k71kxgay283ylbbhhs51cl55zn2q38vj5pk4k950qdnirrlj"))))
+                 "10k2k71kxgay283ylbbhhs51cl55zn2q38vj5pk4k950qdnirrlj"))
+               (patches (search-patches "gcc-fix-texi2pod.patch"))))
       (build-system gnu-build-system)
 
       ;; Separate out the run-time support libraries because all the
@@ -155,7 +156,8 @@ where the OS part is overloaded to denote a specific ABI---into GCC
 
       ;; GCC < 5 is one of the few packages that doesn't ship .info files.
       ;; Newer texinfos fail to build the manual, so we use an older one.
-      (native-inputs `(("texinfo" ,texinfo-5)))
+      (native-inputs `(("perl" ,perl)   ;for manpages
+                       ("texinfo" ,texinfo-5)))
 
       (arguments
        `(#:out-of-source? #t
@@ -351,7 +353,8 @@ Go.  It also includes runtime support libraries for these languages.")
               (sha256
                (base32
                 "08yggr18v373a1ihj0rg2vd6psnic42b518xcgp3r9k81xz1xyr2"))
-              (patches (search-patches "gcc-arm-link-spec-fix.patch"))))
+              (patches (search-patches "gcc-arm-link-spec-fix.patch"
+                                       "gcc-fix-texi2pod.patch"))))
     (supported-systems %supported-systems)
     (inputs
      `(("isl" ,isl-0.11)
@@ -369,8 +372,11 @@ Go.  It also includes runtime support libraries for these languages.")
                (base32
                 "14l06m7nvcvb0igkbip58x59w3nq6315k6jcz3wr9ch1rn9d44bc"))
               (patches (search-patches "gcc-arm-bug-71399.patch"
-                                       "gcc-libvtv-runpath.patch"))))
-    (native-inputs `(("texinfo" ,texinfo)))))
+                                       "gcc-libvtv-runpath.patch"
+                                       "gcc-fix-texi2pod.patch"))))
+    ;; Override inherited texinfo-5 with latest version.
+    (native-inputs `(("perl" ,perl)   ;for manpages
+                     ("texinfo" ,texinfo)))))
 
 (define-public gcc-5
   ;; Note: GCC >= 5 ships with .info files but 'make install' fails to install
@@ -389,7 +395,8 @@ Go.  It also includes runtime support libraries for these languages.")
                                        "gcc-asan-powerpc-missing-include.patch"
                                        "gcc-5.0-libvtv-runpath.patch"
                                        "gcc-5-source-date-epoch-1.patch"
-                                       "gcc-5-source-date-epoch-2.patch"))))
+                                       "gcc-5-source-date-epoch-2.patch"
+                                       "gcc-fix-texi2pod.patch"))))
     (inputs
      `(("isl" ,isl)
        ,@(package-inputs gcc-4.7)))))

gnu/packages/patches/gcc-fix-texi2pod.patch

@@ -0,0 +1,19 @@
+This patch was taken from the official GCC git repository.
+X-Git-Url: https://gcc.gnu.org/git/?p=gcc.git;a=blobdiff_plain;f=contrib%2Ftexi2pod.pl;h=91bdbb5cea933d0381f2924ab94490fca31d5800;hp=eba1bcaa3cffa78b46030b219d04fe7d68367658;hb=67b56c905078d49d3e4028085e5cb1e1fb87a8aa;hpb=2f508a78310caab123e9794d3dcfe41f2769449b
+
+It fixes a defect in the contrib/texi2pod.pl script that prevented generating
+manual pages. It was corrected in the GCC 6.X series.
+
+diff --git a/contrib/texi2pod.pl b/contrib/texi2pod.pl
+index eba1bca..91bdbb5 100755
+--- a/contrib/texi2pod.pl
++++ b/contrib/texi2pod.pl
+@@ -316,7 +316,7 @@ while(<$inf>) {
+ 	@columns = ();
+ 	for $column (split (/\s*\@tab\s*/, $1)) {
+ 	    # @strong{...} is used a @headitem work-alike
+-	    $column =~ s/^\@strong{(.*)}$/$1/;
++	    $column =~ s/^\@strong\{(.*)\}$/$1/;
+ 	    push @columns, $column;
+ 	}
+ 	$_ = "\n=item ".join (" : ", @columns)."\n";