45 lines
2.3 KiB
Plaintext
45 lines
2.3 KiB
Plaintext
# The svr4 reference port for the i860 contains an alloca.o routine
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# in /usr/ucblib/libucb.a, but we can't just try to get that by
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# setting CLIB to /usr/ucblib/libucb.a because (unfortunately)
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# there are a lot of other routines in libucb.a which are supposed
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# to be the Berkeley versions of library routines normally found in
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# libc.a and many of these Berkeley versions are badly broken. Thus,
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# if we try to link programs with libucb.a before libc.a, those
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# programs tend to crash.
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# Also, the alloca() routine supplied in early version of svr4 for
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# the i860 is non-ABI compliant. It doesn't keep the stack aligned
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# to a 16-byte boundary as the ABI requires.
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# More importantly however, even a fully ABI compliant alloca() routine
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# would fail to work correctly with some versions of the native svr4 C
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# compiler currently being distributed for the i860 (as of 1/29/92).
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# The problem is that the native C compiler generates non-ABI-compliant
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# function epilogues which cut back the stack (upon function exit) in
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# an incorrect manner. Specifically, they cut back the stack by adding
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# the nominal *static* frame size (determined statically at compile-time)
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# to the stack pointer rather than setting the stack pointer based upon
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# the current value of the frame pointer (as called for in the i860 ABI).
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# This can cause serious trouble in cases where you repeatedly call a
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# routine which itself calls alloca(). In such cases, the stack will
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# grow continuously until you finally run out of swap space or exceed
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# the system's process size limit. To avoid this problem (which can
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# arise when a stage1 gcc is being used to build a stage2 gcc) you
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# *must* link in the C language version of alloca() which is supplied
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# with gcc to your stage1 version of gcc. The following definition
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# forces that to happen.
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ALLOCA=alloca.o
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# We build all stages *without* shared libraries because that may make
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# debugging the compiler easier (until there is a GDB which supports
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# both Dwarf *and* svr4 shared libraries).
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# Note that the native C compiler for the svr4 reference port on the
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# i860 recognizes a special -gg option. Using that option causes *full*
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# Dwarf debugging information to be generated, whereas using only -g
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# causes only limited Dwarf debugging information to be generated.
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# (This is an undocumented feature of the native svr4 C compiler.)
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CCLIBFLAGS=-Bstatic -dn -gg
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