Fix weak symbols to work in tcc.

Fixes #322.

parts.rst

@@ -381,9 +381,7 @@ C library. Our previous Mes C library was incomplete which prevented us
 from building many newer or more complex programs.
 
 ``tcc`` has slight problems when building and linking ``musl``, so we
-apply a few patches. In particular, we replace all weak symbols with
-strong symbols and will patch ``tcc`` in the next step to ignore
-duplicate symbols.
+apply a few patches.
 
 We do not use any of ``/usr/lib/mes`` or ``/usr/include/mes`` any longer, rather
 using ``/usr/lib`` and ``/usr/include`` like normal.
@@ -657,14 +655,13 @@ and the GNU assembler ``as``.
 musl 1.1.24 (v3)
 ================
 
-We rebuild musl for the third time. This time we use GNU ar rather than ``tcc -ar``,
-so we can drop weak symbols patch. Also, we can use GNU as to build assembly source files,
+We rebuild musl for the third time. This time we can use GNU as to build assembly source files,
 so those assembly files that tcc failed to compile no longer have to be patched.
 
 tcc 0.9.27 (musl v3)
 ====================
 
-We rebuild tcc against new musl and without a patch to ignore duplicate symbols.
+We rebuild tcc against new musl.
 
 gcc 4.0.4
 =========

steps/SHA256SUMS.pkgs

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steps/bison-3.4.1/mk/lib.mk

@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-lib.a: allocator.o areadlink.o argmatch.o asnprintf.o basename.o basename-lgpl.o binary-io.o bitrotate.o bitset.o bitsetv.o calloc.o canonicalize-lgpl.o careadlinkat.o c-ctype.o cloexec.o close.o closeout.o close-stream.o concat-filename.o c-strcasecmp.o c-strncasecmp.o dirname.o dirname-lgpl.o dup2.o dup-safer.o dup-safer-flag.o exitfail.o fatal-signal.o fd-hook.o fd-safer.o fd-safer-flag.o fopen.o fopen-safer.o fprintf.o frexp.o frexpl.o fstat.o getdtablesize.o get-errno.o gethrxtime.o getopt.o getprogname.o getrusage.o gettime.o gettimeofday.o gl_array_list.o gl_list.o gl_xlist.o hard-locale.o hash.o isnan.o isnand.o isnanf.o isnanl.o itold.o ldexpl.o localcharset.o localtime-buffer.o lstat.o main.o malloca.o malloc.o math.o mbrtowc.o mbsinit.o mbswidth.o memchr.o msvc-inval.o obstack.o obstack_printf.o open.o path-join.o perror.o pipe2-safer.o pipe-safer.o printf-args.o printf.o printf-frexp.o printf-frexpl.o printf-parse.o progname.o progreloc.o quotearg.o raise.o rawmemchr.o readlink.o realloc.o relocatable.o rename.o rmdir.o setenv.o sig-handler.o signbitd.o signbitf.o signbitl.o spawnattr_destroy.o spawnattr_init.o sprintf.o stat.o stat-time.o stat-w32.o stpcpy.o strchrnul.o strdup.o strerror.o stripslash.o strndup.o strnlen.o strverscmp.o timespec.o timevar.o unistd.o unlink.o unsetenv.o vasnprintf.o wait-process.o wctype-h.o xalloc-die.o xconcat-filename.o xmalloc.o xmemdup0.o xreadlink.o xsize.o xstrndup.o xtime.o yyerror.o error.o bitset/array.o bitset/list.o bitset/stats.o bitset/table.o bitset/vector.o fseterr.o spawn-pipe.o
+lib.a: allocator.o areadlink.o argmatch.o asnprintf.o basename.o basename-lgpl.o binary-io.o bitrotate.o bitset.o bitsetv.o calloc.o canonicalize-lgpl.o careadlinkat.o c-ctype.o cloexec.o close.o closeout.o close-stream.o concat-filename.o c-strcasecmp.o c-strncasecmp.o dirname.o dirname-lgpl.o dup2.o dup-safer.o dup-safer-flag.o exitfail.o fatal-signal.o fd-hook.o fd-safer.o fd-safer-flag.o fopen.o fopen-safer.o fprintf.o frexp.o frexpl.o fstat.o getdtablesize.o get-errno.o gethrxtime.o getprogname.o getrusage.o gettime.o gettimeofday.o gl_array_list.o gl_list.o gl_xlist.o hard-locale.o hash.o isnan.o isnand.o isnanf.o isnanl.o itold.o ldexpl.o localcharset.o localtime-buffer.o lstat.o main.o malloca.o malloc.o math.o mbrtowc.o mbsinit.o mbswidth.o memchr.o msvc-inval.o obstack.o obstack_printf.o open.o path-join.o perror.o pipe2-safer.o pipe-safer.o printf-args.o printf.o printf-frexp.o printf-frexpl.o printf-parse.o progname.o progreloc.o quotearg.o raise.o rawmemchr.o readlink.o realloc.o relocatable.o rename.o rmdir.o setenv.o sig-handler.o signbitd.o signbitf.o signbitl.o spawnattr_destroy.o spawnattr_init.o sprintf.o stat.o stat-time.o stat-w32.o stpcpy.o strchrnul.o strdup.o strerror.o stripslash.o strndup.o strnlen.o strverscmp.o timespec.o timevar.o unistd.o unlink.o unsetenv.o vasnprintf.o wait-process.o wctype-h.o xalloc-die.o xconcat-filename.o xmalloc.o xmemdup0.o xreadlink.o xsize.o xstrndup.o xtime.o yyerror.o error.o bitset/array.o bitset/list.o bitset/stats.o bitset/table.o bitset/vector.o fseterr.o spawn-pipe.o
 	$(AR) r $@ $^
 
 %.o: %.c

steps/coreutils-5.0/mk/pass2.mk

@@ -95,7 +95,7 @@ ALL=$(BINARIES) $(SRC_DIR)/cp $(SRC_DIR)/ls $(SRC_DIR)/install $(SRC_DIR)/md5sum
 all: $(BINARIES) $(SRC_DIR)/cp $(SRC_DIR)/ls $(SRC_DIR)/install $(SRC_DIR)/md5sum $(SRC_DIR)/mv $(SRC_DIR)/rm $(SRC_DIR)/sha1sum
 
 LIB_DIR = lib
-LIB_SRC = acl alloca posixtm posixver strftime getopt getopt1 hash hash-pjw addext argmatch backupfile basename canon-host closeout cycle-check diacrit dirname dup-safer error exclude exitfail filemode __fpending file-type fnmatch fopen-safer full-read full-write getline getstr gettime hard-locale human idcache isdir imaxtostr linebuffer localcharset long-options makepath mbswidth md5 memcasecmp memcoll modechange offtostr path-concat physmem quote quotearg readtokens rpmatch safe-read safe-write same save-cwd savedir settime sha stpcpy stripslash strtoimax strtoumax umaxtostr unicodeio userspec version-etc xgetcwd xgethostname xmalloc xmemcoll xnanosleep xreadlink xstrdup xstrtod xstrtol xstrtoul xstrtoimax xstrtoumax yesno strnlen getcwd sig2str mountlist regex canonicalize mkstemp memrchr euidaccess ftw obstack strverscmp strftime tsearch stat
+LIB_SRC = acl alloca posixtm posixver strftime getopt getopt1 hash hash-pjw addext argmatch backupfile basename canon-host closeout cycle-check diacrit dirname dup-safer error exclude exitfail filemode __fpending file-type fnmatch fopen-safer full-read full-write getline getstr gettime hard-locale human idcache isdir imaxtostr linebuffer localcharset long-options makepath mbswidth md5 memcasecmp memcoll modechange offtostr path-concat physmem quote quotearg readtokens rpmatch safe-read safe-write same save-cwd savedir settime sha stpcpy stripslash umaxtostr unicodeio userspec version-etc xgetcwd xgethostname xmalloc xmemcoll xnanosleep xreadlink xstrdup xstrtod xstrtol xstrtoul xstrtoimax xstrtoumax yesno strnlen getcwd sig2str mountlist regex canonicalize mkstemp memrchr euidaccess ftw obstack strverscmp strftime tsearch stat
 
 LIB_OBJECTS = $(addprefix $(LIB_DIR)/, $(addsuffix .o, $(LIB_SRC)))
 

steps/coreutils-6.10/mk/main.mk

@@ -94,7 +94,7 @@ ALL=$(BINARIES) $(SRC_DIR)/sha256sum
 all: $(BINARIES) $(SRC_DIR)/sha256sum
 
 LIB_DIR = lib
-LIB_SRC = acl alloca getdate fprintftime posixtm posixver strftime getopt hash hash-pjw argmatch backupfile basename canon-host closeout cycle-check diacrit dirname dup-safer error exclude exitfail filemode fpending file-type fnmatch fopen-safer full-read full-write getline gettime hard-locale human idcache imaxtostr linebuffer localcharset long-options mbswidth md5 memcasecmp memcoll modechange offtostr physmem quote quotearg readtokens rpmatch safe-read safe-write same save-cwd savedir settime sha256 stpcpy stripslash umaxtostr unicodeio userspec version-etc version-etc-fsf xgetcwd xgethostname xmalloc xmemcoll xnanosleep readlink xstrtod xstrtol xstrtoul xstrtoimax xstrtoumax yesno strnlen getcwd sig2str mountlist canonicalize mkstemp memrchr euidaccess obstack strverscmp strftime xalloc-die close-stream tempname filenamecat xstrndup randint randread rand-isaac gethrxtime
+LIB_SRC = acl alloca getdate fprintftime posixtm posixver strftime hash hash-pjw argmatch backupfile basename canon-host closeout cycle-check diacrit dirname dup-safer error exclude exitfail filemode fpending file-type fnmatch fopen-safer full-read full-write getline gettime hard-locale human idcache imaxtostr linebuffer localcharset long-options mbswidth md5 memcasecmp memcoll modechange offtostr physmem quote quotearg readtokens rpmatch safe-read safe-write same save-cwd savedir settime sha256 stpcpy stripslash umaxtostr unicodeio userspec version-etc version-etc-fsf xgetcwd xgethostname xmalloc xmemcoll xnanosleep readlink xstrtod xstrtol xstrtoul xstrtoimax xstrtoumax yesno strnlen getcwd sig2str mountlist canonicalize mkstemp memrchr euidaccess obstack strverscmp strftime xalloc-die close-stream tempname filenamecat xstrndup randint randread rand-isaac gethrxtime
 
 LIB_OBJECTS = $(addprefix $(LIB_DIR)/, $(addsuffix .o, $(LIB_SRC)))
 

steps/musl-1.1.24/patches/musl_weak_symbols.patch

@@ -1,17 +0,0 @@
-SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
-SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
-
-SPDX-License-Identifier: MIT
-
-Replace weak symbols with strong to workaround an issue with tcc -ar
-This won't be necessary once we can rebuild with ar from binutils.
---- src/include/features.h	2021-02-02 23:15:42.791932948 +0000
-+++ src/include/features.h	2021-02-02 23:17:21.394647015 +0000
-@@ -6,6 +6,6 @@
- #define weak __attribute__((__weak__))
- #define hidden __attribute__((__visibility__("hidden")))
- #define weak_alias(old, new) \
--	extern __typeof(old) new __attribute__((__weak__, __alias__(#old)))
-+	extern __typeof(old) new __attribute__((/*__weak__, */__alias__(#old)))
- 
- #endif

steps/tcc-0.9.27/patches-pass5/ignore-static-inside-array.patch

@@ -1 +0,0 @@
-../patches/ignore-static-inside-array.patch

steps/tcc-0.9.27/patches-pass5/static-link.patch

@@ -1 +0,0 @@
-../patches/static-link.patch

steps/tcc-0.9.27/patches/dont-skip-weak-symbols-ar.patch

@@ -0,0 +1,50 @@
+SPDX-FileCopyrightText: 2021 Alexander Sosedkin <monk@unboiled.info>
+
+SPDX-License-Identifier: LGPL-2.0-or-later
+
+From da11cf651576f94486dbd043dbfcde469e497574 Mon Sep 17 00:00:00 2001
+From: Alexander Sosedkin <monk@unboiled.info>
+Date: Sat, 30 Oct 2021 16:04:11 +0200
+Subject: [PATCH] Don't skip weak symbols during ar creation
+
+```
+$ echo 'int __attribute__((__weak__)) f(void) { return 4; }' > w.c
+$ tcc -c w.c -o w.o
+
+$ tcc-old -ar rc w.a w.o; nm -s w.a  # previous behaviour, not indexed
+w.o:
+0000000000000000 W f
+
+$ ar rc w.a w.o; nm -s w.a           # GNU binutils behaviour, indexed
+Archive index:
+f in w.o
+
+0000000000000000 W f
+
+$ tcc-new rc w.a w.o; nm -s w.a      # new behaviour, indexed
+Archive index:
+f in w.o
+
+0000000000000000 W f
+```
+---
+ tcctools.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/tcctools.c b/tcctools.c
+index cf174965..4567b81a 100644
+--- tcctools.c
++++ tcctools.c
+@@ -200,6 +200,9 @@ ST_FUNC int tcc_tool_ar(TCCState *s1, int argc, char **argv)
+                     (sym->st_info == 0x10
+                     || sym->st_info == 0x11
+                     || sym->st_info == 0x12
++                    || sym->st_info == 0x20
++                    || sym->st_info == 0x21
++                    || sym->st_info == 0x22
+                     )) {
+                     //printf("symtab: %2Xh %4Xh %2Xh %s\n", sym->st_info, sym->st_size, sym->st_shndx, strtab + sym->st_name);
+                     istrlen = strlen(strtab + sym->st_name)+1;
+-- 
+2.11.4.GIT
+

steps/tcc-0.9.27/patches/ignore-duplicate-symbols.patch

@@ -1,19 +0,0 @@
-SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
-
-SPDX-License-Identifier: LGPL-2.0-or-later
-
-Ignore duplicate symbols. Due to poor support for weak symbols in tcc-ar
-we had to patch musl to replace weak symbols with strong symbols
---- tccelf.c	2021-02-02 17:41:08.662247892 +0000
-+++ tccelf.c	2021-02-02 23:21:49.652080201 +0000
-@@ -552,8 +552,9 @@
- #if 0
-                 printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
-                        sym_bind, shndx, new_vis, esym_bind, esym->st_shndx, esym_vis);
--#endif
-                 tcc_error_noabort("'%s' defined twice", name);
-+#endif
-+                goto do_patch;
-             }
-         } else {
-         do_patch: