Yoshiki Hayashi <t90553(a)mail.ecc.u-tokyo.ac.jp&gt; writes: Here is version that checks the CC the user specified, is slightly more verbose and also checks for -O3 It works for me. Index: configure.in =================================================================== RCS file: /usr/CVSroot/XEmacs/xemacs-20/configure.in,v retrieving revision 1.135 diff -u -u -r1.135 configure.in --- configure.in 1999/11/02 04:17:06 1.135 +++ configure.in 1999/12/06 18:49:47 ＠＠ -1032,7 +1032,7 ＠＠ alpha*-*-* ) machine=alpha ;; vax-*-* ) machine=vax ;; mips-dec-* ) machine=pmax ;; - mips-sgi-* ) machine=iris4d ;; + mips-sgi-* ) machine=iris6d ;; mips*-linux ) machine=mips ;; romp-ibm-* ) machine=ibmrt ;; rs6000-ibm-aix* ) machine=ibmrs6000 ;; ＠＠ -1347,13 +1347,13 ＠＠ m68*-sgi-iris3.5* ) machine=irist opsys=iris3-5 ;; m68*-sgi-iris3.6* | m68*-sgi-iris*) machine=irist opsys=iris3-6 ;; dnl Iris 4D - mips-sgi-irix3.* ) opsys=irix3-3 ;; - mips-sgi-irix4.* ) opsys=irix4-0 ;; + mips-sgi-irix3.* ) opsys=irix3-3 machine=iris4d ;; + mips-sgi-irix4.* ) opsys=irix4-0 machine=iris4d ;; mips-sgi-irix6* ) opsys=irix6-0 ;; - mips-sgi-irix5.1* ) opsys=irix5-1 ;; - mips-sgi-irix5.2* ) opsys=irix5-2 ;; - mips-sgi-irix5.* ) opsys=irix5-3 ;; - mips-sgi-irix* ) opsys=irix5-0 ;; + mips-sgi-irix5.1* ) opsys=irix5-1 machine=iris4d ;; + mips-sgi-irix5.2* ) opsys=irix5-2 machine=iris4d ;; + mips-sgi-irix5.* ) opsys=irix5-3 machine=iris4d ;; + mips-sgi-irix* ) opsys=irix6-0 machine=iris4d ;; dnl SONY machines *-sony-newsos[[34]]* | *-sony-news[[34]]* ) opsys=bsd4-3 ;; ＠＠ -1791,6 +1791,70 ＠＠ CFLAGS="-O" ;dnl The only POSIX-approved flag fi fi + +dnl Search for GCC specific build problems we know about +if test "$GCC" = "yes"; then +AC_MSG_CHECKING(for buggy gcc versions) +GCC_VERSION=`$CC --version` +case `uname -s`:`uname -m`:$GCC_VERSION in + dnl egcs 2.90.21 (egcs-1.00 release) + dnl egcs 2.90.29 (egcs-1.0.3 release) + *:sun4*:2.8.1|*:sun4*:egcs-2.90.*) + dnl Don't use -O2 with gcc 2.8.1 and egcs 1.0 under SPARC architectures + dnl without also using `-fno-schedule-insns'. + case "$CFLAGS" in + *-O2*|*-O3*) + case "$CFLAGS" in + *-fno-schedule-insns*) ;; + *) + AC_MSG_RESULT(Yes) + AC_MSG_WARN(Don't use -O2 with gcc 2.8.1 and egcs 1.0 under SPARC architectures) + AC_MSG_WARN(without also using -fno-schedule-insns.) + AC_MSG_ERROR(Aborting due to known problem) + ;; + esac + ;; + esac + ;; + dnl egcs-2.91.57 (egcs-1.1 release) + dnl egcs-2.91.66 (egcs-1.1.2 release) + Linux:alpha:egcs-2.91.*) + AC_MSG_RESULT(Yes) + AC_MSG_WARN(There have been reports of egcs-1.1 not compiling XEmacs correctly on) + AC_MSG_WARN(Alpha Linux. There have also been reports that egcs-1.0.3a is O.K.) + AC_MSG_ERROR(Aborting due to known problem) + ;; + *:i*86*:2.7.2*) + case "$GCC_VERSION" in + 2.7.2) + case "$CFLAGS" in + *-O2*|*-O3*) + case "$CFLAGS" in + *-fno-strength-reduce*) ;; + *) + AC_MSG_RESULT(Yes) + AC_MSG_WARN(Don't use -O2 with gcc 2.7.2 under Intel/XXX without also using) + AC_MSG_WARN(-fno-strength-reduce.) + AC_MSG_ERROR(Aborting due to known problem) + ;; + esac + ;; + esac + ;; + esac + case "$CFLAGS" in + *-fno-caller-saves*) ;; + *) + AC_MSG_RESULT(Yes) + AC_MSG_WARN(Don't use -O2 with gcc 2.7.2 under Intel/XXX without also using) + AC_MSG_WARN(-fno-caller-saves.) + AC_MSG_ERROR(Aborting due to known problem) + ;; + esac + ;; +esac +fi +AC_MSG_RESULT(No) dnl Inform compiler that certain flags are meant for the linker dnl XE_PROTECT_LINKER_FLAGS(shell_var)