fix mremap memory synchronization and use of variadic argument

[musl] / configure

diff --git a/configure b/configure
index c277764..742ca26 100755 (executable)
--- a/configure
+++ b/configure
@@ -329,6 +329,13 @@ printf "yes\n"
 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
 fi
 
+#
+# The GNU toolchain defaults to assuming unmarked files need an
+# executable stack, potentially exposing vulnerabilities in programs
+# linked with such object files. Fix this.
+#
+tryflag CFLAGS_C99FSE -Wa,--noexecstack
+
 #
 # Check for options to disable stack protector, which needs to be
 # disabled for a few early-bootstrap translation units. If not found,
@@ -429,13 +436,6 @@ fi
 tryflag CFLAGS_AUTO -fno-unwind-tables
 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
 
-#
-# The GNU toolchain defaults to assuming unmarked files need an
-# executable stack, potentially exposing vulnerabilities in programs
-# linked with such object files. Fix this.
-#
-tryflag CFLAGS_AUTO -Wa,--noexecstack
-
 #
 # On x86, make sure we don't have incompatible instruction set
 # extensions enabled by default. This is bad for making static binaries.
@@ -476,10 +476,18 @@ if test "x$visibility" = xauto ; then
 # - the -include option
 # - the attributes/pragmas used in vis.h
 # - linking code that takes the address of protected symbols
+# - gcc 3.x bug that wrongly claims declarations mismatch
 printf "checking whether global visibility preinclude works... "
-echo 'int (*fp)(void);' > "$tmpc"
-echo 'int foo(void) { }' >> "$tmpc"
-echo 'int bar(void) { fp = foo; return foo(); }' >> "$tmpc"
+cat > "$tmpc" <<EOF
+__attribute__((__visibility__("default")))
+extern struct a *const x;
+typedef struct a b;
+extern b *const x;
+b *const x;
+int (*fp)(void);
+int foo(void) { }
+int bar(void) { fp = foo; return foo(); }
+EOF
 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
   -DSHARED -fPIC -I./src/internal -include vis.h \
   -nostdlib -shared -Wl,-Bsymbolic-functions \
@@ -499,6 +507,12 @@ fi
 # Some patched GCC builds have these defaults messed up...
 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 
+# Prevent linking if there are undefined symbols; if any exist,
+# libc.so will crash at runtime during relocation processing.
+# The common way this can happen is failure to link the compiler
+# runtime library; implementation error is also a possibility.
+tryldflag LDFLAGS_AUTO -Wl,--no-undefined
+
 test "$shared" = "no" || {
 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 LDFLAGS_DUMMY=
@@ -542,6 +556,7 @@ test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
 && SUBARCH=${SUBARCH}el
 
 if test "$ARCH" = "sh" ; then
+tryflag CFLAGS_AUTO -Wa,--isa=any
 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
 # Some sh configurations are broken and replace double with float
@@ -560,7 +575,6 @@ SUBARCH=${SUBARCH}-nofpu
 fi
 if trycppif __SH_FDPIC__ "$t" ; then
 SUBARCH=${SUBARCH}-fdpic
-shared=no
 fi
 fi