https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99621
--- Comment #8 from William Bader <williambader at hotmail dot com> --- Created attachment 50404 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50404&action=edit example program before creduce This is the example that I cut from a much larger module. The problematic area is around the line `#if DBUG_FIX`. $ rm a.out ; gcc -Wall -O9 gcc-bug1-init.c ; a.out # ok in m64 len 4287, good $ rm a.out ; gcc -m32 -Wall -O9 gcc-bug1-init.c ; a.out # fails in m32 -O9 len 5167, expected bad $ rm a.out ; gcc -m32 -Wall -O0 gcc-bug1-init.c ; a.out # ok in m32 -O0 len 4287, good $ rm a.out ; gcc -m32 -Wall -O9 -DBUG_FIX=1 gcc-bug1-init.c gcc-bug1b.c ; a.out # ok in m32 -O9 calling an empty function gcc-bug1-init.c: In function ‘find_ad_image_breaks’: gcc-bug1-init.c:756:4: warning: implicit declaration of function ‘gcc_bug_fix’ [-Wimplicit-function-declaration] 756 | gcc_bug_fix(); | ^~~~~~~~~~~ len 4287, good $ cat gcc-bug1b.c void gcc_bug_fix(void) { } $ rm a.out ; clang -m32 -Wall -O3 gcc-bug1-init.c ; a.out # ok in clang gcc-bug1-init.c:154:19: warning: illegal character encoding in string literal [-Winvalid-source-encoding] memcmp(buf, COREL_HEADER_STRING, COREL_HEADER_STRING_LEN) != 0) { ^~~~~~~~~~~~~~~~~~~ gcc-bug1-init.c:130:30: note: expanded from macro 'COREL_HEADER_STRING' #define COREL_HEADER_STRING "<C5><D0><D3><C6>" /* start of header */ ^~~~~~~~~~~~~~~~ 1 warning generated. len 4287, good $ uname -a Linux laptop 5.10.22-100.fc32.x86_64 #1 SMP Tue Mar 9 17:40:24 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux $ gcc -v Using built-in specs. COLLECT_GCC=/usr/bin/gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.2.1 20201125 (Red Hat 10.2.1-9) (GCC)
