MPW/Carbon build crashes in qsort()

I get an EXC_BAD_INSTRUCTION entering qsort() in a program built with
mrc/ppclink, when run under OS X/Carbon. A typical invocation:

int c(const void *a, const void *b){ return (*(int*)a)-(*(int*)b); }
qsort(a, 10, sizeof(int), c);

A corresponding "classic" build does not crash.

Can anyone shed any light on this? I cannot use Xcode/gcc as a PEF
executable is required (plugin). CodeWarrior build would probably work
around the problem but MPW is preferable.

--Toby


Makefile snippet:

LIBS_CLASSIC = ∂
"{SharedLibraries}InterfaceLib" ∂
"{SharedLibraries}StdCLib" ∂
"{SharedLibraries}MathLib" ∂
"{SharedLibraries}NavigationLib" ∂
"{SharedLibraries}AppearanceLib" ∂
"{SharedLibraries}WindowsLib" ∂
"{SharedLibraries}ControlsLib" ∂
"{PPCLibraries}StdCRuntime.o" ∂
"{PPCLibraries}PPCCRuntime.o" ∂
#"{PPCLibraries}PPCToolLibs.o" ∂
#"{PPCLibraries}"CarbonAccessors.o

LIBS_CARBON = ∂
"{SharedLibraries}CarbonLib" ∂
"{SharedLibraries}StdCLib" ∂
"{PPCLibraries}PPCCRuntime.o"

COPT = -opt speed -tb on -w 2,35
COPTEXTRA = -d MAC_ENV {ACCESSPATHS} -proto strict

PPCLINKOPTS = -t {PLUGINTYPE} -c {PLUGINCREATOR} -m main
....
..ca.x ƒ .c # Carbon PowerPC object
mrc {depdir}{default}.c -o {targ} {COPT} {COPTEXTRA} -d TARGET_CARBON
..cl.x ƒ .c # Classic PowerPC object
mrc {depdir}{default}.c -o {targ} {COPT} {COPTEXTRA}

{EXEC_CLASSIC} ƒƒ {OBJ_CLASSIC}
PPCLink -o {Targ} {PPCLINKOPTS} {OBJ_CLASSIC} {LIBS_CLASSIC}
{EXEC_CARBON} ƒƒ {OBJ_CARBON}
PPCLink -o {Targ} {PPCLINKOPTS} -d {OBJ_CARBON} {LIBS_CARBON}