ref: ea588fa8a7848ccd7a048251823d72559574f6a8
parent: 643e8a40e46be15008645eecbeac019d7796552b
author: Roberto E. Vargas Caballero <k0ga@shike2.com>
date: Wed Jun 1 10:16:10 EDT 2022
driver/posix: Make easier to target a musl libc This commit adds some boilerplate to make easier to support musl. There are some corner cases that can produce some headaches but it is a big improvement over what we had before.
--- a/Makefile
+++ b/Makefile
@@ -13,10 +13,13 @@
ROOT = $(DESTDIR)$(PREFIX)
NODEP = 1
-all:
+all: config
+@$(MAKE) `$(SCRIPTDIR)/config -c` toolchain
+@$(MAKE) `$(SCRIPTDIR)/config` `uname -m`
+config:
+ cd include/scc/scc && $(MAKE) $@
+
install:
$(SCRIPTDIR)/install $(ROOT)
+@$(MAKE) install-`uname -m`
@@ -109,3 +112,7 @@
clean:
xargs rm -rf < $(SCRIPTDIR)/libc-dirs
rm -f dirs
+
+distclean: clean
+ rm -f include/scc/scc/sysld.h
+ rm -f include/scc/scc/sysincludes.h
--- a/README
+++ b/README
@@ -8,6 +8,10 @@
- PREFIX: Prefix of the path where scc toolchain is going
to be installed. /usr/local by default.
+ - LIBPREFIX: Prefix of the path where scc searchs for
+ headers and libraries when scc is executed. $PREFIX
+ by default.
+
- DESTDIR: Temporary directory prepend to PREFIX used in the
install path. It is mainly intended to help package maintainers
to install in a specific directory used as base for the package
@@ -55,6 +59,9 @@
for all the available configurations based in the host
architecture.
+ - config
+ Generate headers supposed to be customized by the user.
+
- toolchain
Compile the toolchain with the default configuration
specified in CONF.
@@ -71,6 +78,28 @@
- distclean
Remove all the generated files.
+
+Musl libc support
+=================
+The Scc libc is a C99 library and cannot used to compile POSIX compliant
+programs. Scc includes a template that can be used to use a musl libc
+compiled by gcc:
+
+ $ make LIBPROFILE=musl config
+
+It will generate the files sysld.h and sysincludes.h configured to be used
+with a musl libc. Beware that it is likely that those files have to be
+customized to fit your system because the macro GCCLIBPATH depends heavily
+of the toolchain used to compile musl. As the musl libc is likely
+will be installed in a different prefix the scc compilation must be modified
+to:
+
+ $ make LIBPREFIX=/usr/local/musl
+
+If the helper scc shell script is used instead of scc-cc then the
+environment variable SCCLIBPREFIX must be set:
+
+ $ SCCLIBPREFIX=/usr/local/musl scc hello.c
Deviations from standard C
===========================
--- a/include/scc/scc/Makefile
+++ b/include/scc/scc/Makefile
@@ -10,21 +10,23 @@
NODEP = 1
-all: $(SYSHDR)
+all: cstd.h
cstd.h: cstd-$(STD).h
cp cstd-$(STD).h $@
+config: sysld.h sysincludes.h
+
sysld.h:
set -e;\
rm -f $@;\
trap "rm -f $$$$.tmp" INT QUIT TERM HUP;\
sed -e 's/%NOPIE%/"$(NOPIE_LDFLAGS)",/' \
- -e 's/"",//' sysld.def.h > $$$$.tmp && \
+ -e 's/"",//' sysld.$(LIBPROFILE).h > $$$$.tmp && \
mv $$$$.tmp $@
sysincludes.h:
- cp sysincludes.def.h $@
+ cp sysincludes.$(LIBPROFILE).h $@
clean:
- rm -f $(SYSHDR)
+ rm -f cstd.h
--- a/include/scc/scc/sysincludes.def.h
+++ /dev/null
@@ -1,8 +1,0 @@
-/* configure below your standard sys include paths */
-char *sysincludes[] = {- "%p/include/bits/%a/",
- "%p/include/bits/%s/",
- "%p/include/bits/%s/%a/",
- "%p/include/",
- NULL
-};
--- /dev/null
+++ b/include/scc/scc/sysincludes.scc.h
@@ -1,0 +1,8 @@
+/* configure below your standard sys include paths */
+char *sysincludes[] = {+ "%p/include/bits/%a/",
+ "%p/include/bits/%s/",
+ "%p/include/bits/%s/%a/",
+ "%p/include/",
+ NULL
+};
--- a/include/scc/scc/sysld.def.h
+++ /dev/null
@@ -1,14 +1,0 @@
-/* configure below your system linker command line */
-
-char *ldcmd[] = {- "-static",
- "-z","nodefaultlib",
- %NOPIE%
- "-o","%o",
- "-L","%p/lib/scc/%a-%s",
- "%p/lib/scc/%a-%s/crt.o",
- "%c",
- "-lc",
- "-lcrt",
- NULL
-};
--- /dev/null
+++ b/include/scc/scc/sysld.scc.h
@@ -1,0 +1,14 @@
+/* configure below your system linker command line */
+
+char *ldcmd[] = {+ "-static",
+ "-z","nodefaultlib",
+ %NOPIE%
+ "-o","%o",
+ "-L","%p/lib/scc/%a-%s",
+ "%p/lib/scc/%a-%s/crt.o",
+ "%c",
+ "-lc",
+ "-lcrt",
+ NULL
+};
--- a/scripts/rules.mk
+++ b/scripts/rules.mk
@@ -4,6 +4,7 @@
# Define default configuration variables
PREFIX = /usr/local
LIBPREFIX = $(PREFIX)
+LIBPROFILE = scc
CONF = amd64-linux
TOOL = unix
HOST = posix