Tests fail to build with LTO #451
Description
I tried to build arpack and run its tests using LTO with these *FLAGS: -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing
It failed while compiling the test programs:
/bin/sh ../libtool --tag=F77 --mode=link x86_64-pc-linux-gnu-gfortran -march=native -fstack-protector-all -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-clash-protection -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,-O1 -Wl,--as-needed -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,--defsym=__gentoo_check_ldflags__=0 -o dnsimp dnsimp.o mmio.o ../SRC/libarpack.la -llapack -lblas
libtool: link: x86_64-pc-linux-gnu-gfortran -march=native -fstack-protector-all -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-clash-protection -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,-O1 -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,--defsym=__gentoo_check_ldflags__=0 -o .libs/dnsimp dnsimp.o mmio.o -Wl,--as-needed ../SRC/.libs/libarpack.so //usr/lib/gcc/x86_64-pc-linux-gnu/13/libquadmath.so -lm -llapack -lblas
dnsimp.f:196:72: error: type of 'mmread' does not match original declaration [-Werror=lto-type-mismatch]
196 | * temp,temp,temp,A,temp)
| ^
mmio.f:1:23: note: 'mmread' was previously declared here
1 | subroutine mmread(iunit,rep,field,symm,rows,cols,nnz,nnzmax,
| ^
mmio.f:1:23: note: code may be misoptimized unless '-fno-strict-aliasing' is used
lto1: some warnings being treated as errors
lto-wrapper: fatal error: x86_64-pc-linux-gnu-gfortran returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
Downstream bug report: https://bugs.gentoo.org/878139
Full build log: build.log