X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=configure;h=143dc92740aa36025870fdc255a5b0a76a6fee49;hb=63c188ec42e76ff768e81f6b65b11c68fc43351e;hp=30f409fdfbe4776a8e4041ac96f1972ef92f4e20;hpb=9ca4dae5d895cf816eb1815511aba77a90f6acd7;p=musl

diff --git a/configure b/configure
index 30f409fd..143dc927 100755
--- a/configure
+++ b/configure
@@ -27,6 +27,7 @@ Optional features:
   --enable-optimize=...   optimize listed components for speed over size [auto]
   --enable-debug          build with debugging information [disabled]
   --enable-warnings       build with recommended warnings flags [disabled]
+  --enable-visibility     use global visibility options to optimize PIC [auto]
   --enable-gcc-wrapper    build musl-gcc toolchain wrapper [auto]
   --disable-shared        inhibit building shared library [enabled]
   --disable-static        inhibit building static library [enabled]
@@ -79,7 +80,7 @@ fi
 tryflag () {
 printf "checking whether compiler accepts %s... " "$2"
 echo "typedef int x;" > "$tmpc"
-if $CC "$2" -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
 printf "yes\n"
 eval "$1=\"\${$1} \$2\""
 eval "$1=\${$1# }"
@@ -111,6 +112,7 @@ fi
 CFLAGS_C99FSE=
 CFLAGS_AUTO=
 CFLAGS_MEMOPS=
+CFLAGS_NOSSP=
 LDFLAGS_AUTO=
 OPTIMIZE_GLOBS=
 prefix=/usr/local/musl
@@ -123,7 +125,8 @@ target=
 optimize=auto
 debug=no
 warnings=no
-shared=yes
+visibility=auto
+shared=auto
 static=yes
 wrapper=auto
 
@@ -147,6 +150,8 @@ case "$arg" in
 --disable-debug|--enable-debug=no) debug=no ;;
 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
 --disable-warnings|--enable-warnings=no) warnings=no ;;
+--enable-visibility|--enable-visibility=yes) visibility=yes ;;
+--disable-visibility|--enable-visibility=no) visibility=no ;;
 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
@@ -204,7 +209,7 @@ fi
 # musl-gcc wrapper, and for critical bug detection in some gcc versions.
 #
 printf "checking whether compiler is gcc... "
-if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
+if fnmatch '*gcc\ version*' "$(LC_ALL=C $CC -v 2>&1)" ; then
 cc_is_gcc=yes
 else
 cc_is_gcc=no
@@ -245,11 +250,13 @@ case "$target" in
 # Catch these early to simplify matching for 32-bit archs
 mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
 arm*) ARCH=arm ;;
+aarch64*) ARCH=aarch64 ;;
 i?86*) ARCH=i386 ;;
 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 x86_64*) ARCH=x86_64 ;;
 mips*) ARCH=mips ;;
 microblaze*) ARCH=microblaze ;;
+or1k*) ARCH=or1k ;;
 powerpc*) ARCH=powerpc ;;
 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
@@ -288,6 +295,13 @@ printf "yes\n"
 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 fi
 
+#
+# Check for options to disable stack protector, which needs to be
+# disabled for a few early-bootstrap translation units. If not found,
+# this is not an error; we assume the toolchain does not do ssp.
+#
+tryflag CFLAGS_NOSSP -fno-stack-protector
+
 #
 # Check for options that may be needed to prevent the compiler from
 # generating self-referential versions of memcpy,, memmove, memcmp,
@@ -298,12 +312,9 @@ fi
 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
 
 #
-# If debugging is explicitly enabled, don't auto-enable optimizations
+# Enable debugging if requessted.
 #
-if test "$debug" = yes ; then
-CFLAGS_AUTO=-g
-test "$optimize" = auto && optimize=no
-fi
+test "$debug" = yes && CFLAGS_AUTO=-g
 
 #
 # Possibly add a -O option to CFLAGS and select modules to optimize with
@@ -380,10 +391,12 @@ tryflag CFLAGS_AUTO -Wa,--noexecstack
 # extensions enabled by default. This is bad for making static binaries.
 # We cheat and use i486 rather than i386 because i386 really does not
 # work anyway (issues with atomic ops).
+# Some build environments pass -march and -mtune options via CC, so
+# check both CC and CFLAGS.
 #
 if test "$ARCH" = "i386" ; then
-fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
-fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
+fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
+fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 fi
 
 #
@@ -408,16 +421,43 @@ tryflag CFLAGS_AUTO -Wno-unknown-pragmas
 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
 fi
 
+if test "x$visibility" = xauto ; then
+# This test checks toolchain support for several things:
+# - the -include option
+# - the attributes/pragmas used in vis.h
+# - linking code that takes the address of protected symbols
+printf "checking whether global visibility preinclude works... "
+echo 'int (*fp)(void);' > "$tmpc"
+echo 'int foo(void) { }' >> "$tmpc"
+echo 'int bar(void) { fp = foo; return foo(); }' >> "$tmpc"
+if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
+  -DSHARED -fPIC -I./src/internal -include vis.h \
+  -nostdlib -shared -Wl,-Bsymbolic-functions \
+  -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+visibility=yes
+else
+visibility=no
+fi
+printf "%s\n" "$visibility"
+fi
+
+if test "x$visibility" = xyes ; then
+CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
+CFLAGS_AUTO="${CFLAGS_AUTO# }"
+fi
+
 # Some patched GCC builds have these defaults messed up...
-tryflag CFLAGS_AUTO -fno-stack-protector
 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 
+test "$shared" = "no" || {
 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 LDFLAGS_DUMMY=
 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
+test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
 printf "warning: disabling dynamic linking support\n"
 shared=no
 }
+}
 
 # Find compiler runtime library
 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
@@ -428,7 +468,7 @@ printf "using compiler runtime libraries: %s\n" "$LIBCC"
 
 # Figure out arch variants for archs with variants
 SUBARCH=
-t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS_AUTO $CFLAGS"
+t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
 
 if test "$ARCH" = "x86_64" ; then
 trycppif __ILP32__ "$t" && ARCH=x32
@@ -439,6 +479,10 @@ trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
 fi
 
+if test "$ARCH" = "aarch64" ; then
+trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
+fi
+
 if test "$ARCH" = "mips" ; then
 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
@@ -495,27 +539,6 @@ printf "no\n"
 fail "$0: error: unsupported long double type"
 fi
 
-#
-# Check for known bug in GCC 4.9.0 that results in a broken libc.
-#
-if test "$cc_is_gcc" = yes ; then
-printf "checking for gcc constant folding bug with weak aliases... "
-echo 'static int x = 0;' > "$tmpc"
-echo 'extern int y __attribute__((__weak__, __alias__("x")));' >> "$tmpc"
-echo 'extern int should_appear;' >> "$tmpc"
-echo 'int foo() { return y ? should_appear : 0; }' >> "$tmpc"
-case "$($CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include \
-  $CPPFLAGS $CFLAGS_AUTO $CFLAGS -S -o - "$tmpc" 2>/dev/null)" in
-*should_appear*)
-printf "no\n"
-;;
-*)
-printf "yes\n"
-fail "$0: error: broken compiler; try CFLAGS=-fno-toplevel-reorder"
-;;
-esac
-fi
-
 printf "creating config.mak... "
 
 cmdline=$(quote "$0")
@@ -538,9 +561,10 @@ libdir = $libdir
 includedir = $includedir
 syslibdir = $syslibdir
 CC = $CC
-CFLAGS= $CFLAGS_AUTO $CFLAGS
+CFLAGS = $CFLAGS_AUTO $CFLAGS
 CFLAGS_C99FSE = $CFLAGS_C99FSE
 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
+CFLAGS_NOSSP = $CFLAGS_NOSSP
 CPPFLAGS = $CPPFLAGS
 LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
 CROSS_COMPILE = $CROSS_COMPILE