rime_api.h: error: RimeRegisterModule violates the C++ One Definition Rule [-Werror=odr]

[liangyongxiang]

Describe the bug
Type mismatch error encountered when compiling with lto turned on:

/var/tmp/portage/app-i18n/librime-1.12.0/work/librime-1.12.0/src/rime_api.h:249:15: error: ‘RimeRegisterModule’ violate
s the C++ One Definition Rule [-Werror=odr]
  249 | RIME_API Bool RimeRegisterModule(RimeModule* module);
      |               ^
/var/tmp/portage/app-i18n/librime-1.12.0/work/librime-1.12.0/src/rime_api.cc:37:15: note: return value type mismatch
   37 | RIME_API Bool RimeRegisterModule(RimeModule* module) {
      |               ^
/var/tmp/portage/app-i18n/librime-1.12.0/work/librime-1.12.0/src/rime_api.cc:37:15: note: type ‘int’ should match type ‘bool’
/var/tmp/portage/app-i18n/librime-1.12.0/work/librime-1.12.0/src/rime_api.cc:37:15: note: ‘RimeRegisterModule’ was previously declared here
/var/tmp/portage/app-i18n/librime-1.12.0/work/librime-1.12.0/src/rime_api.cc:37:15: note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
lto1: some warnings being treated as errors
lto-wrapper: fatal error: /usr/bin/x86_64-pc-linux-gnu-g++ returned 1 exit status

There are multiple definitions of Bool in the code:

src/rime_api.h
42:#define Bool int

src/rime_api_stdbool.h
14:#define Bool bool

To Reproduce
Steps to reproduce the bug:

export CFLAGS="-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"
export CXXFLAGS="-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"

make

Expected behavior
Support to enable LTO compilation

Package:

• OS: Gentoo
• Version: 1.12.0, master
• URI: https://github.com/gentoo/gentoo/tree/master/app-i18n/librime