new gcc wrapper, entirely specfile based

the _concept_ of this wrapper has been tested extensively, but the
integration with the build/install system, and using a persistent
specfile rather than one generated at build-time, have not been
heavily tested and may need minor tweaks.

this approach should be a lot more robust (and easier to improve) than
writing a shell script that's responsible for trying to mimic gcc's
logic about whether it's compiling or linking, building shared libs or
executable files, etc. it's also lighter weight and should result in
mildly faster builds when using the wrapper.

diff --git a/.gitignore b/.gitignore
index c1a6cd51d2786b915160d3af3d03ca2d361c1efc..455e3580cb5ccc829cd937c6b82fa9f0c228e9ac 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ arch/*/bits/alltypes.h
 config.mak
 include/bits
 tools/musl-gcc
+lib/musl-gcc.specs

diff --git a/Makefile b/Makefile
index 7906c52fd185a77651dc4dd8debb594b12853aea..72b640a4020c12f2992625242f339e89629b6834 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,8 @@ EMPTY_LIBS = $(EMPTY_LIB_NAMES:%=lib/lib%.a)
 CRT_LIBS = lib/crt1.o lib/crti.o lib/crtn.o
 STATIC_LIBS = lib/libc.a $(EMPTY_LIBS)
 SHARED_LIBS = lib/libc.so
-ALL_LIBS = $(CRT_LIBS) $(STATIC_LIBS) $(SHARED_LIBS)
+TOOL_LIBS = lib/musl-gcc.specs
+ALL_LIBS = $(CRT_LIBS) $(STATIC_LIBS) $(SHARED_LIBS) $(TOOL_LIBS)
 ALL_TOOLS = tools/musl-gcc
 
 LDSO_PATHNAME = $(syslibdir)/ld-musl-$(ARCH).so.1
@@ -93,8 +94,11 @@ $(EMPTY_LIBS):
 lib/%.o: crt/%.o
        cp $< $@
 
-tools/musl-gcc: tools/gen-musl-gcc.sh config.mak
-       sh $< "$(prefix)" "$(LDSO_PATHNAME)" > $@ || { rm -f $@ ; exit 1 ; }
+lib/musl-gcc.specs: tools/musl-gcc.specs.sh config.mak
+       sh $< "$(includedir)" "$(libdir)" "$(LDSO_PATHNAME)" > $@
+
+tools/musl-gcc: config.mak
+       printf '#!/bin/sh\nexec gcc "$$@" -specs "%s/musl-gcc.specs"\n' "$(libdir)" > $@
        chmod +x $@
 
 $(DESTDIR)$(bindir)/%: tools/%

diff --git a/tools/gen-musl-gcc.sh b/tools/gen-musl-gcc.sh
deleted file mode 100644 (file)
index 7b80fda..0000000
--- a/tools/gen-musl-gcc.sh
+++ /dev/null
@@ -1,60 +0,0 @@
-#!/bin/sh
-
-printf '#!/bin/sh\n\nlibc_prefix="%s"\nldso_pathname="%s"\n' "$1" "$2"
-
-cat <<"EOF"
-gcc=gcc
-libc_lib=$libc_prefix/lib
-libc_inc=$libc_prefix/include
-libc_crt="$libc_lib/crt1.o"
-libc_start="$libc_lib/crti.o"
-libc_end="$libc_lib/crtn.o"
-
-gcc_inc=$libc_inc
-libgcc="$("$gcc" -print-file-name=libgcc.a)"
-libgcc=${libgcc%/libgcc.a}
-
-gccver=${libgcc##*/}
-gcctarget=${libgcc%/*}
-gcctarget=${gcctarget##*/}
-
-case "$gccver" in
-[0123].*|4.[01]*) ;;
-*) nosp=-fno-stack-protector ;;
-esac
-
-[ "x$1" = "x-V" ] && { printf "%s: -V not supported\n" "$0" ; exit 1 ; }
-
-for i ; do
-case "$skip$i" in
--I|-L) skip=--- ; continue ;;
--[cSE]|-M*) nolink=1 ;;
--shared|-nostartfiles|-nostdlib) nocrt=1 ;;
--*) ;;
-*) havefile=1 ;;
-esac
-skip=
-done
-
-[ "$havefile" ] || nolink=1
-
-[ "$nolink" ] && nocrt=1
-
-[ "$nocrt" ] || set -- "$libc_start" "$libc_crt" "$@" "$libc_end" \
-
-[ "$nolink" ] || {
-tmp_specs=$HOME/.specs.tmp.$$
-printf '*link_libgcc:\n\n\n' > "$tmp_specs" || exit 1
-exec 3<"$tmp_specs"
-rm -f "$tmp_specs"
-set -- -specs=/proc/self/fd/3 "$@" \
-  -Wl,--as-needed -Wl,--start-group -lc -lgcc -lgcc_eh -Wl,--end-group \
-  -Wl,-dynamic-linker,"$ldso_pathname" -Wl,-nostdlib
-}
-
-set -- -nostdinc -nostdlib $nosp \
-  -isystem "$libc_inc" -isystem "$gcc_inc" "$@" \
-  -L"$libc_lib" -L"$libgcc"
-
-exec "$gcc" "$@"
-EOF

diff --git a/tools/musl-gcc.specs.sh b/tools/musl-gcc.specs.sh
new file mode 100644 (file)
index 0000000..30b2676
--- /dev/null
+++ b/tools/musl-gcc.specs.sh
@@ -0,0 +1,39 @@
+incdir=$1
+libdir=$2
+ldso=$3
+cat <<EOF
+%rename cpp_options old_cpp_options
+
+*cpp_options:
+-nostdinc -isystem $incdir %(old_cpp_options)
+
+*cc1:
+%(cc1_cpu) -nostdinc -isystem $incdir 
+
+*link_libgcc:
+-L$libdir
+
+*libgcc:
+libgcc.a%s %:if-exists(libgcc_eh.a%s)
+
+*startfile:
+%{!shared: $libdir/crt1.o} $libdir/crti.o %{shared|pie:crtbeginS.o%s;:crtbegin.o%s}
+
+*endfile:
+%{shared|pie:crtendS.o%s;:crtend.o%s} $libdir/crtn.o
+
+%rename link old_link
+
+*link:
+%(old_link) -dynamic-linker $ldso -nostdlib
+
+*esp_link:
+
+
+*esp_options:
+
+
+*esp_cpp_options:
+
+
+EOF