From 9c3edc2250ca08a451e9424b288a49ff77d80d1a Mon Sep 17 00:00:00 2001 From: Rainer Orth Date: Fri, 17 May 2002 19:07:01 +0000 Subject: [PATCH] install.texi (Specific, [...]): Document need to bootstrap with -mips3. * doc/install.texi (Specific, mips-sgi-irix6): Document need to bootstrap with -mips3. From-SVN: r53565 --- gcc/ChangeLog | 5 +++++ gcc/doc/install.texi | 21 +++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b57b910e271f..5bef9fc39c46 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2002-05-17 Rainer Orth + + * doc/install.texi (Specific, mips-sgi-irix6): Document need to + bootstrap with -mips3. + 2002-05-17 David S. Miller PR c/6689, PR optimization/6615 diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index d97a98eb8f62..77577f771b52 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -3179,6 +3179,27 @@ then your version of @command{cc} uses the O32 or N64 ABI by default. You should set the environment variable @env{CC} to @samp{cc -n32} before configuring GCC@. +If you want the resulting @command{gcc} to run on old 32-bit systems +with the MIPS R4400 CPU, you need to ensure that only code for the mips3 +instruction set architecture (ISA) is generated. While GCC 3.x does +this correctly, both GCC 2.95 and SGI's MIPSpro @command{cc} may change +the ISA depending on the machine where GCC is built. Using one of them +as the bootstrap compiler may result in mips4 code, which won't run at +all on mips3-only systems. For the test program above, you should see: + +@example +test.o: ELF N32 MSB mips-3 @dots{} +@end example + +If you get: + +@example +test.o: ELF N32 MSB mips-4 @dots{} +@end example + +instead, you should set the environment variable @env{CC} to @samp{cc +-n32 -mips3} or @samp{gcc -mips3} respectively before configuring GCC@. + GCC on IRIX 6 is usually built to support both the N32 and N64 ABIs. If you build GCC on a system that doesn't have the N64 libraries installed, you need to configure with @option{--disable-multilib} so GCC doesn't -- 2.47.2